PC-300A Series

Microprocessor pH/ORP

Transmitter

Operation Manual

CONTENTS

Precautions for installation

1. Specifications..............................................................................................................................12. Assembly and installation

2.1 Transmitter installation..........................................................................................................2 2.2 Illustration of panel mounting................................................................................................2 2.3 Assembly of electrode and housing.......................................................................................3 2.3.1 Cable setup....................................................................................................................3 2.3.2 Assembly of immersive holder and junction box 8-09-5+PP-100A (Optional)...........3 2.3.3 Illustration of PP protective holder and L-shaped holder support base........................5 2.4 Illustration and description of the round junction box...........................................................6 2.5 Illustration and description of the square junction box..........................................................9

3. Wiring3.1 Illustration of rear panel........................................................ ..............................................12 3.2 Descriptions of terminal function........................................................................................13 3.3 Wiring descriptions of transmitter............................................ ...........................................14 3.3.1 Illustration of electrical connection............................................................................14 3.3.2 Wiring of ATC probe and fixed temperature compensation.......................................15 3.4 Illustration of accessorial transmitter pH-300T (Optional)..................................................16 3.5 Connection of transmitter and accessorial transmitter pH-300T.........................................17 3.6 Wiring description of pH-300T............................................................................................18 3.7 Calibration steps after installation of pH-300T........................ ...........................................20 3.8 Illustration of online pH/ORP measurement system (Optional)..........................................21

4. Configuration4.1 Illustration of front panel of PC-310A.................................................................................22 4.2 Illustration of front panel of PC-320A.................................................................................24 4.3 Block diagram of PC-300A.................................................................................................25

5. Calibration5.1 Calibration of pH electrode..................................................................................................26 5.2 Inspection of ORP electrode................................................................................................27

6. Setting6.1 RELAY control setup...........................................................................................................29 6.2 Analog output setting and RELAY test................................................................................30

7. Maintenance.............................................................................................................................32

Thank you for purchasing Suntex products. In order to improve and enhance the transmitter’s function, Suntex reserves the right to modify the contents and icon display of the product. The actual situation is subject to the instrument without notice. The operation manual is only provided for function and installation description, Suntex Instruments Co., Ltd. is not liable for any person or entity for any direct or indirect loss or damage due to improper usage of this product. If you have any questions or find omission, negligence or mistakes in the operation manual, please contact us, thank you. Precautions for installation Wrong wiring will lead to breakdown or electrical shock of the instrument, please read this operation manual carefully prior to installation. Make sure to remove AC power from the transmitter before wiring input, output connections, and

remove it before opening the transmitter’s housing. The installation site of the transmitter should be good in ventilation and avoid direct sunshine. The material of signal cable should be special coaxial cable. Strongly recommend using our coaxial

cable. Do not use normal wires instead. Avoid electrical surge when using power. Especially when using three-phase power, use ground

wire correctly. If the power surges interference occurs, separate the power supply of transmitter from the control device, such as: dosing machines, mixers, etc. to make individual power supply for the transmitter; or set surge absorber to reduce the power surges at all electromagnetic switches and power control device coils. The internal relay contact of the instruments is for alarm or control function. Due to safety, it is a

must to connect to external relays that can withstand enough amperes, which makes sure the safety operation of the instrument. (Please refer to ch3.3.1 Illustration of electrical control.)

1. SpecificationModel PC-310A PC-320A PH-300T

Measurement modes pH/ORP

Ranges pH 0.00~14.00 pH

ORP -1999~1999 mV TEMP －

Resolutions pH 0.01pH

ORP 1mV TEMP －

Accuracy pH ±0.01pH (±1 Digit)

ORP ±0.1% (±1 Digit) TEMP －

Auto Temperature Compensation

NTC30K Auto Temp Comp (optional) PT1K Auto Temp Comp

(optional)

Manual Temperature Compensation

Temp Comp at 25°C/ Temp Comp. with Resistance Temp Comp. with

Resistance

Ambient Temp. 0~50°C

Storage Temp -20~70°C

Input Impedance >1012Ω

Display LCD display with digits and function

indicators LCD display

Analog Output Isolated DC 4~20mA output, corresponding to

0~14pH or -1000~1000mV

Low resistance DC output or DC 4~20mA

output

Control Setting 2×RELAY 4×RELAY －

Contact 2A Max. (recommended) －

Activation Hi/Lo Hi1/Hi2/Lo1/Lo2 －

Function check Set up an analog output of 4mA or 20mA to see

if RELAY works properly －

Voltage Output DC±12V, 1W Max. for pH-300T (optional) －

Power supply 100V~240VAC±10%, 6W Max., 50/60Hz DC 32V Max.

Installation Panel Mounting Wall or pipe mounting

Dimensions 144mm × 144mm × 195mm (H×W×D) 70mm × 110mm × 45mm

(H×W×D)

Cut off Dimensions 135 mm × 135 mm (H×W) －

Weight 1.2Kg 0.4Kg Note: The specifications are subject to change without notice.

1

2. Assembly and installation2.1 Transmitter installation

Prepare a square hole of 135mm x 135mm on the panel box, and then insert the transmitter directly into the panel box. Fit the transmitter with brackets and fasten them with screwdriver.

2.2 Illustration of panel mounting

At least 180mm

＋At least

194 mm

＋

＋ ＋

Hole distances on the panel box

135 mm

135 mm

Front view Hole size Mounting bracket Screws

Mounting bracket

195 mm

Side view

2

2.3 Assembly of electrode and housing 2.3.1 Cable set-up

a. Make sure to remove the conductive rubber or aluminum-foil layer between the electrodesignal wire and the coaxial shield.

b. Extend the cable to the transmitter without any joint except specific junction box. Connectthe transparent coaxial inner directly to the Glass terminal on the back of transmitter, andmetal connect coaxial shield to Ref. terminal.

2.3.2 Assembly of immersive electrode holder and junction box 8-09-5+ PP-100A (Optional)

W/O a temp. probe

W/ NTC30K W/ PT1000 W/O a temp.

probe, W/ a SG probe

PP-100A PP-100AN PP-100AP PP-100AE Note: 1. PP-xxxA series is applied to 2-wire distribution only.

2. PP-xxxAE series is applied to 3-wire distribution only.

Set-up diagram of coaxial cable: Follow the left set-up illustration. The black conductive rubber covering on the coaxial inner should be removed.

Transparent coaxial inner (remove the conductive rubber)

Metal coaxial shield

A---- Upper cover of round junction box F---- O-ring B---- O-ring G---- PP Electrode Protective Housing C---- Cable fixing gland MG16A H---- Electrode (Sensor) D---- Lower cover of round junction box I---- Rubber electrode holder E---- Cable fixing point MG16A J---- PP pipe protective cover

PP protective holder:

3

1. Insert the electrode (H) through PP Electrode Protective Housing (G) 2. Rinse the electrode (H) properly so that it can be easily passed through Rubber electrode

holder (I), with about 5cm left below. 3. Install the prepared Rubber electrode holder (I) into PP Electrode Protective Holder (G) and

fix PP pipe protective cover (J) tightly. 4. Insert the Electrode cable (H) through Lower cover of round junction box (D) and Cable

fixing gland (C), and use Lower cover of round junction box (D) to fix PP Electrode Protective Housing (G) tightly. Note: The (F) O-shaped ring should be fixed into a glove on PP Electrode Protective Housing (G) correctly.

5. Prepare 15cm cable in the PP pipe, and then fix Cable fixing gland MG16A(C) tightly. Leave electrode cable (H) for about 12-14cm, and split it carefully.

6. Fix the terminal of electrode coaxial inner on terminal block 1 of round holder; Fix the terminal of electrode coaxial shield on terminal block 3. (See the instruction of junction box)

7. Extend the cable to pass through Cable fixing gland (E) on Lower cover of round junction box (D), and fix Cable fixing gland MG16A (E) tightly, leaving 12-14cm in the box for split.

8. Extend the lead coaxial inner and electrode coaxial inner to connect them; extend the lead coaxial shield to fix on the terminal block 3. Tight up Upper cover of round junction box (A) to finish the installation. Note: The (B) O-shaped ring should be placed below the round junction box (D) correctly.

Installation of holder support base The L-shaped electrode holder support base is installed by finding an appropriate position in the edge of a pool according to the field’s requirements with nails or expansion screws.

A------Holder U-shaped clamp B------Immersive holder (PP-100A) C------Holder fixed plate D------Support base E------Plastic screws

8-26-7: Plastic L-Shaped Electrode Holder Support Base 7202-00416A: Stainless L Shaped Electrode Holder Support Base

4

1. Fix the holder fixed plate (C) into the L-shaped support base (D) 2. Fix the U-shaped clamp (A) into immersive holder (B) 3. Combine abovementioned items together by screwing them up with plastic screws (E)

2.3.3 Illustration of PP protective holder and L-shaped holder support base

58.5mm

28mm

56mm

56mm

∅7mm

8-26-7: Plastic L-Shaped Electrode Holder Support Base Plastic material: PP Max. resistance temperature: 80°C

50mm

40mm

110mm

1160mm (PP-100A)

5

2.4 Illustration and description of the round junction box i. 2-wire distributing system:

i. Two-wire distributing system

Labels on round junction box

Terminals on transmitter INPUT terminals

Terminal No.

OUTPUT terminals (7202-RG-58)

(7202-F94009-BK)

Coaxial inner from sensor 1 Coaxial inner GLASS

Shield (forbidden) 2 Shield (forbidden) ------

Coaxial shield from sensor 3 Coaxial shield REF

Green wire from temp. probe 4 Green wire SG

Red wire from temp. probe 5 Red wire ATC

Alternative 6, 7 Alternative ------

(8-09-5)

Note: It is necessary to make REF and SG short-circuited as 2-wire distribution system is applied (with a built-in jumper between them).

w/o a temp. probe Use coaxial shield wire 7202-RG-58 w/ a temp. probe Use coaxial 4-core wire 7202-F94009-BK

Junction box

Temp. probe

Transparent

Shield

IN

OUT

Green Red

pH/ORP sensor

Transparent

Transparent

Shield

Shield

Gr

Gr

Red

Red

Black

6

Note: 1. Extension cable; Order Number: 7202-F94009-BK or 7202-RG-58 (1) Select RG-58 if temperature probe is not used. (Order No.: 7202-RG-58) (2) Select F94009-BK if temperature probe is used. (Order No.: 7202-F94009-BK) 2. As temperature probe 8-26-3 (NTC30K) or 8-26-8 (PT1K) is used for two-wire

distribution, the black wire should be forbidden.

ii. 3-wire distributing system:

(8-09-5) Junction box

pH/ORP sensor

Temp. probe

Coaxial 4-core wire: 7202-F94009-BK

OUT

IN

Transparent

Transparent

Transparent

Green

Gr

Gr

Red

Shield

Red Shield

Shield Red Black

Note: The SG probe is connected to terminal 2 as it is used instead of a temp. probe. At the time, red wire from 7202-F94009-BK is NC.

Note: The jumper between REF and SG should be removed as 3-wire distribution system is applied.

7

ii. Three-wire distributing system Labels on round junction box Terminals on transmitter

IN terminals Terminal

No. OUT terminals

(7202-F94009-BK)

Coaxial inner from sensor 1 Coaxial inner GLASS

Green wire from temp. probe + black wire from temp. probe (SG probe)

2 Coaxial shield SG

Coaxial shield from sensor 3 Green wire REF

Red wire from temp. probe 4 Red wire ATC

Alternative 5, 6, 7 Alternative ---- Note: 1. The black wire from temperature probe 8-26-3 (NTC30K) or 8-26-8 (PT1K) is used as SG and it is connected together with the green wire to terminal 2 on junction box. 2. It is necessary to apply our coaxial 4-core wire: 7202-F94009-BK that contains temperature and solution ground.

8

2.5 Illustration and description of the square junction box i. 2-wire distributing system:

i. Two-wire distributing system

Labels on square junction box

Terminals on transmitter INPUT terminals Terminal No.

OUTPUT terminals (7202-RG-58)

(7202-F94009-BK)

Coaxial inner from sensor GLASS (1) Coaxial inner GLASS

Coaxial shield from sensor REF (2) Coaxial shield REF

Green wire from temp. probe SG (3) Green wire SG

Red wire from temp. probe TP (4) Red wire ATC

Alternative NC (0, 5, 6, 7) Alternative ------

Note: It is necessary to make REF and SG short-circuited as 2-wire distribution system is applied (with a built-in jumper between them).

w/o a temp. probe Use coaxial shield wire 7202-RG-58 w/ a temp. probe Use coaxial 4-core wire 7202-F94009-BK

(8-09)

IN OUT

Square junction box pH/ORP sensor Temp. probe

Transparent

Transparent Transparent

Shield

Shield Shield

Green

Green Green

Red

Red Red

Black (NC)

IN OUT

9

Note: 1. Extension cable; Order Number: 7202-F94009-BK or 7202-RG-58 (1) Select RG-58 if temperature probe is not used. (Order No.: 7202-RG-58) (2) Select F94009-BK if temperature probe is used. (Order No.: 7202-F94009-BK) 2. As temperature probe 8-26-3 (NTC30K) or 8-26-8 (PT1K) is used for two-wire

distribution, the black wire should be forbidden.

ii. 3-wire distributing system:

Note: The jumper between REF and SG should be removed as 3-wire distribution system is applied.

Square junction box

Coaxial 4-core wire: 7202 - F94009 - BK

pH/ORP sensor Temp. probe

IN OUT

Shield

Shield Green Shield

Green

Gr

Transparent

Transparent Transparent

Red

Red BL

Red

10

ii. Three-wire distributing system Labels on round junction box

Terminals on transmitter IN terminals Terminal No.

OUT terminals (7202-F94009-BK)

Coaxial inner from sensor GLASS (1) Coaxial inner GLASS

Coaxial shield from sensor REF (2) Coaxial shield REF

Green wire from temp. probe + black wire from temp. probe (SG probe)

SG (3) Green wire SG

Red wire from temp. probe TP (4) Red wire ATC

Alternative NC (0, 5, 6, 7) Alternative ------ Note: 1. The black wire from temperature probe 8-26-3 (NTC30K) or 8-26-8 (PT1K) is used as SG and it is connected together with the green wire to SG terminal on the junction box. 2. It is necessary to apply our coaxial 4-core wire: 7202-F94009-BK that contains temperature and solution ground.

11

3. Wiring 3.1 Illustration of rear panel Note 2: Put the pH or ORP sticker once measurement mode is selected for convenience of recognition.

Note 1: Unused cable glands should be plugged with rubber plugs.

12

3.2 Descriptions of terminal function

GLASS

Connecting to the coaxial inner (transparent wire) of pH/ORP electrode signal wire

REF Connecting to the coaxial shield (net wire) of pH/ORP electrode signal wire

SG

1. SG and REF should be short circuited with a jumper if two-wire system is used. (There is a jumper after out of factory.)

2. Remove the jumper if three-wire system is used. It should connect one end of solution ground or temperature probe.

ATC Connect the other end of temperature probe

1. If ATC probe or resistance is not used, terminals of MTC should be short-circuited by a jumper, which is regarded as compensation at 25°C (with a built-in jumper between them).

2. If ATC probe or resistance is used, a jumper should be removed.

Transfer a jumper from terminals of MTC to ORP as it goes to ORP measurement.

DC ± 12V DC output terminal ±12V (for our PH-300T only)

SG Ground terminal of DC output ±12V

Isolated current output terminals for external recorders or PC: 4~20mA matched to 0~14 pH 4~20mA matched to -1000~1000 mV

Terminals for power supply (100~240VAC)

Terminals for relay control (H1 or L1)

Terminals for relay control (H2 or L2) <PC-320A Only>

Ground terminal for power supply

SG

REF

SG

－12V

＋12V

GLASS

ORP

＋ OUTPUT

4~20mA －

MTC

ATC 3 Wires

2 Wires

MTC

POWER(L) POWER(N)

COM

NC

NO

L2

H2

L1

COM

NO

COM

NO

POWER(L)

POWER(N)

H1 COM

NC

NO

E

ORP

OUTPUT 4~20mA

＋

－

NC COM NO COM NO

E

13

3.3 Wiring descriptions of transmitter 3.3.1 Illustration of electrical connection

Note: Repair and replacement of the built-in miniature relay of transmitter require professional technicians. It is recommended to connect an external relay (Power Relay) with our transmitters to activate surrounding equipments.

E

COM NO

Transmitter

100~240VAC

Relay L1 Relay H2 Relay L2

100~240VAC

Relay H1

COM

NO

NC

NC

COM

NO

COM

NO

COM

NO

Dosing pump

Surge absorber

M

Dosing pump

Surge absorber

M

Dosing pump

Surge absorber

M

Dosing pump

Surge absorber

M

Surge absorber

External relay

Surge absorber

External relay

Surge absorber

External relay

Surge absorber

External relay

14

MTC

ATC

SG

3.3.2 Wiring of ATC probe and fixed temperature compensation R value for fixed temperature compensation (PC-310A/PC-320A)

Temp. 0°C 5°C 10°C 15°C 20°C 25°C

R value 94.98K 74.44K 58.75K 46.67K 37.30K 30.00K

Temp. 30°C 35°C 40°C 45°C 50°C 55°C

R value 24.27K 19.74K 16.15K 13.28K 10.97K 9.109K

Temp. 60°C 65°C 70°C 80°C 90°C 100°C

R value 7.599K 6.367K 5.359K 3.843K 2.799K 2.069K PC-350A

Temp. 0°C 5°C 10°C 15°C 20°C R value 1000Ω 1019.25Ω 1038.5Ω 1057.75Ω 1077Ω Temp. 25°C 30°C 35°C 40°C 45°C

R value 1096.25Ω 1115.5Ω 1134.75Ω 1154Ω 1173.25Ω Temp. 50°C 55°C 60°C 65°C 70°C

R value 1192.5Ω 1211.75Ω 1231Ω 1250.25Ω 1269.5Ω Temp. 75°C 80°C 85°C 90°C 100°C

R value 1288.75Ω 1308Ω 1327.25Ω 1346.5Ω 1385Ω

Note: Remove the jumper from terminals on MTC if a temperature probe is used or temperature compensation with resistance is used.

To solution ground

ATC

To ATC probe

To ATC probe MTC

ATC

SG R

Temperature compensation with resistance

(PC-310A/PC-320A/PC-350A)

Temperature compensation at 25°C (PC-310A/PC-320A)

MTC (PC-350A)

With a jumper MTC

ATC

SG

15

3.4 Installation of accessorial transmitter PH-300T (Optional) Accessorial pH/ORP transmitter, PH-300T, is mainly installed on the electrode protective pipe, but it also can be applied to wall mounting or pipe mounting. For long distance transmission (100m), for example, if the distance between a transmitter and an electrode overweighs 30 meter long, it is recommended that accessorial transmitter PH-300T should be used to avoid the attenuation of electrode signal which also leads to convenience of onsite observation, measurement, and calibration.

Illustration of wall mounting type

1. Combine the sun shield and PH-300T transmitter by round stainless steel screws 4x15 2. Fix item 1 combination on wall by self-tapping screws

Illustration of pipe mounting type

1. Fix immersive holder (B) into U-shaped clamp (A) 2. Combine the item 1. combination with PH-300T (C) by Round stainless steel screws 4×15

A------Sun shield of PH-300T B------PH-300T transmitter C------Round stainless steel screws 4x15 D------Self-tapping screws (defined by customer)

A------U-shaped clamp B------Immersive holder C------PH-300T transmitter D------Round stainless steel screws 4×15

16

3.5 Connection of transmitter and accessorial transmitter PH-300T

A. Connect the GLASS point of transmitter PH-300T’s terminal to the electrode coaxial inner. (Note: Remove the black conductive rubber); connect the REF point of transmitter PH-300T’s terminal to the electrode coaxial shield.

B. Regarding two-wire distributing system and three-wire distributing system please refer to ch3.6. C. Sign “PT-1000” on transmitter PH-300T’s terminal is the connector for automatic temperature

compensation probe, PT-1000, or applies a fixed temperature compensation resistance. D. The V+ and V- of transmitter PH-300T’s terminal respectively connect to DC12V+ and – of the

transmitter. E. The S+ and S- on transmitter PH-300T’s terminal respectively connect to GLASS and REF of

the transmitter. F. The I+ and I- on transmitter PH-300T’s terminal are output (4-20mA), which can connect to

devices that receive current signals. Note: 1. Do not share the same power supply with more transmitters at a time under 2-wire distributing system. 2. As the current output signal of transmitter is not insulated, it is unavailable to connect with PC or PLC; or it would do damage on electrodes.) Refer to the following table for proper fixed temperature compensation resistance Temperature 0°C 5°C 10°C 15°C 20°C R value 1000Ω 1019.25Ω 1038.5Ω 1057.75Ω 1077Ω Temperature 25°C 30°C 35°C 40°C 45°C R value 1096.25Ω 1115.5Ω 1134.75Ω 1154Ω 1173.25Ω Temperature 50°C 55°C 60°C 65°C 70°C R value 1192.5Ω 1211.75Ω 1231Ω 1250.25Ω 1269.5Ω Temperature 75°C 80°C 85°C 90°C 100°C R value 1288.75Ω 1308Ω 1327.25Ω 1346.5Ω 1385Ω

17

3.6 Wiring description of PH-300T

2-wire distribution system:

2-wire distribution system pH/ORP sensor &

temp. probe PH-300T terminals PH-300T

terminals Coaxial 4-core wire (7202-F94009-BK)

Terminals on transmitter

Coaxial inner GLASS S+ Coaxial inner GLASS Coaxial shield REF. S- Coaxial shield REF

Green wire PT-1000 V- Green wire -12V Red wire V+ Red wire +12V

Note: 1. It is necessary to make REF and SG terminals short-circuited for PH-300T if 2-wire distribution system is applied (with a built-in jumper between them). 2. The black wire would be forbidden if 8-26-8 is used as 2-wire distribution. 3. It is necessary to apply our coaxial 4-core wire: 7202-F94009-BK.

(Short-circuited)

紅

-

Green Green Red Red

Shield

Shield

Transparent

Transparent Black (NC) Transparent Red

Gr Shield

pH/ORP sensor

Temperature probe

18

3-wire distribution system:

3-wire distribution system pH/ORP sensor &

temp. probe PH-300T terminals

PH-300T terminals

Coaxial 4-core wire (7202-F94009-BK)

Terminals on transmitter

Coaxial inner GLASS S+ Coaxial inner GLASS Coaxial shield REF. S- Coaxial shield REF

Black wire SG V- Green wire -12V Green wire PT-1000 V+ Red wire +12V Red wire

Note: 1. It is necessary to remove a jumper betweeb REF and SG terminals for PH-300T if 3-wire distribution system is applied. 2. The black wire should be used as SG if 8-26-8 is used as 3-wire distribution.3. It is necessary to apply our coaxial 4-core wire: 7202-F94009-BK.

pH/ORP

sensor Temperature probe

Co axial 4-core wire: 7202-F94009-BK

Shield

Transparent

Red Gr

Red Gr

Transparent

Shield

Black

Red

Shield

Gr

Transparent

19

3.7 Calibration steps after installation of pH-300T Note: 1. Make sure that all wiring is connected to terminals correctly. 2. Make sure that a switch to pH mode or ORP mode is set properly. 3. It is necessary to connect a solution ground on SG terminal or make SG and REF short circuited while installation. Please refer to ch3.6 Wiring description of PH-300T carefully.

pH calibration: 1. Clean the pH electrode with distilled water, place it into a standard buffer pH7.00 and adjust

CAL button until it reaches pH7.00 on display of pH-300T. 2. Clean the pH electrode with distilled water, place it into a standard buffer pH4.00 or

pH10.00 and adjust SLOPE button until it reaches pH4.00 or pH10.00 on display of pH-300T.

3. If a transmitter is used with pH-300T together, adjust CAL button on pH-300T and transmitter respectively and adjust SLOPE button on pH-300T and transmitter respectively; in this case, it is available to simultaneous function and thus it works that calibration can be done on pH-300T only.

ORP calibration: 1. Clean the ORP electrode with distilled water, place it into an ORP standard buffer and

adjust CAL button until it reaches correct ORP value. 2. If a transmitter is used with pH-300T together, adjust CAL button on pH-300T and

transmitter respectively so that it is available to simultaneous function and thus it works that calibration can be done on pH-300T only.

20

3.8 Illustration of Online pH/ORP measurement system (Optional)

A Immersion system in open basin 7202-PP-100A Immersive Protection Housing Pipe B Measurement in very variable water

levels, or lakes with a float 7202-PP-100A + 8-SF01 Sensor Float

C Flow-through system 8-TF03 Sensor Flow-through Chamber D 1/2” & 3/4” pipe mounted system 8-IF03PVC Sensor Housing (Pipe connection), 3/4"NPT E 1” pipe mounted system F Side-entry system in vessel G Top-entry system in closed vessel

21

4. Configuration 4.1 Illustration of front panel of PC-310A 1. : Power switch key. RELAY and analog output are not working under OFF status;

while, RELAY and analog output are working under ON status. 2. : Calibration key. After pressing it to enter calibration mode, RELAY function is not

working even though the reading is fluctuating and also analog output signal will remain as what it was before HOLD status. Then, it will show current measuring values, STDBY sign and pH or mV sign will be twinkling. Move on calibration by adjusting CALIB knob and SLOPE knob and then press STDBY once finished. After that, STDBY sign will disappear and pH or mV sign will cease twinkling, which means calibration is complete and calibration data is stored. Finally, it will go back to measurement mode and both RELAY & analog output resume working.

Note 1: After calibration is complete, it is necessary to press knob to confirm that calibration data has been stored; however, it has not without pressing it and it will go back to measurement mode in 20 minutes automatically and a new measurement will follow previous calibration data. Note 2: If a sign “----“ on top of display and measuring value are shown in turn, it suggests that CALIB knob has reached a mechanical boundary; nevertheless, if a sign “----“ on bottom of display and measuring value are shown in turn, it suggests that SLOPE knob has reached a mechanical boundary. If it shows " " on display, it suggests that both CALIB and SLOPE have reached their mechanical boundary. It is available for user to turn the knob in a reverse way if abovementioned conditions occur. If it still fails to reach a desired calibration value, it means that a shift to zero-point potential or slope is way much. It is recommended to use new pH standard buffers or conduct maintenance for pH electrodes. Replace the pH electrode if above two methods fail.

3. CALIB knob: pH7.00 adjustment knob; ORP adjustment knob Note: When STDBY sign or pH sign is twinkling, it is valid to turn CALIB knob. It is invalid besides that in case that measuring values may be adjusted at random.

22

4. SLOPE knob: pH electrode slope adjustment knob, usually at pH4.00 or pH10.00 (invalid for ORP measurement)

Note: When STDBY sign or pH sign is twinkling, it is valid to turn SLOPE knob. It is invalid besides that in case that measuring values may be adjusted at random. 5. : Under measurement mode, a short press is to select Hi/Lo set point control; while, an

extended press is to enter analog output setting and RELAY test. Measuring value and analog output will remain what they were prior to HOLD status, and it ceases RELAY control. (1) Release it after a short press to enter Hi/Lo set point control. How to press: pH → H1 → L1→ pH/mV (It shows Hi & Lo indicators.) Enter H1: Hi set point control. It shows H1 twinkling on display and H1 set point can be set up by adjusting Hi knob to make a test for Hi indicator. Press MODE (Note 1) to store H1 set point value and then enter L1 set point control. It shows L1 twinkling on display and L1 set point can be set up by adjusting Lo knob to make a test for Lo indicator. Press MODE (Note 1) to store L1 set point value and then go back to measurement mode with RELAY, analog output on. (2) An extended press until it shows 4mA on display to enter analog output setting and RELAY test. How to press: pH/mV → 4mA → 20mA → H1(on) →H1(off) → L1(on) → L1(off) → pH/mV Enter 4mA (analog output of 4mA), it shows 4mA on display. Press MODE to enter 20mA (analog output of 20mA) and it shows 20mA on display. Press MODE to enter H1(on): H1 RELAY test, it turns on H1 RELAY action and Hi indicator with on & H1 showing on display. Press MODE to enter H1(off) to turn off H1 RELAY action and Hi indicator with off & H1 showing on display. Press MODE to enter L1(on): L1 RELAY test, it turns on L1 RELAY action and Lo indicator with on & L1 showing on display. Press MODE to enter L1(off) to turn off L1 RELAY action and Lo indicator with on & L1 showing on display. Press MODE to return measurement mode with RELAY, analog output on. Note 1: It is available to see Hi/Lo set point value after entering Hi/Lo set point control. It will go back to measurement mode in 2 minutes with previous setting about set point control if without any operation. Note 2: If a sign " " and set point value are shown in turn on display, it means that Hi or Lo knob has reached mechanical boundary or set point has been out of set range. Turn the knob in a reverse way to its original position and resume control point setting. Note 3: After entering analog output setting and RELAY test, it will automatically return measurement mode in 2 minutes if without any operation.

6. Hi, Lo Knob: Hi/Lo set point control knob Note: It is valid to turn Hi or Lo knob only when H1 or L1 is twinkling on display. It is invalid besides that in case that RELAY may be adjusted at random.

7. Hi, Lo indicator: RELAY indicator of Hi/Lo set point control Note: Hi set point is used to add acids or reductants, while Lo set point is used to add alkaline or oxidants. 8. Display: Large LCD display that shows main measurement & function indication status(MODE)

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4.2 Illustration of front panel of PC-320A

1. : Add setup of H2 & L2. Descriptions for other functions are the same as PC-310A.

How to press: pH/mV → H1 → L1 → H2 → L 2 → pH/mV

2. H1,H2,L1,L2 knob: Hi/Lo set point control knob

H1 is for upper point setup in high set-point. H2 is for lower point setup in high set-point. L1 is for lower point setup in low set-point. L2 is for upper point setup in low set-point Note: It is valid to turn H1, L1, H2 or L2 knob only when H1, L1, H2 or L2 is twinkling on display. It is invalid besides that in case that RELAY may be adjusted at random.

3. Four set points of PC-320 are individual relays.

4. Please refer to ch4.1 Illustration of front panel of PC-310A about functions from other buttons and

knobs.

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4.3 Block diagram of PC-300A

M easurement mode

Turn ON/OFF Display

Calibration mode

Display & setup of L1

Display & setup of H2

Display & setup of L2

Analog output of 20mA

Turn on H1 relay test

Turn off H1 relay test

Turn on L1 relay test

Turn off L1 relay test

D isplay & setup of H1

Analog output of 4mA

Turn on H2 relay test

Turn off H2 relay test

Turn off L2 relay test

Turn on L2 relay test

PC-320A Only

PC-320A Only

Push for a while

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5. Calibration: 5.1 Calibration of pH electrode:

1. Switch to pH measurement mode. 2. Press to enter calibration mode. It shows current measuring value and STDBY sign

with pH sign twinkling on display. At the moment, relay is turned off, analog output will remain what it was prior to HOLD status and start calibration.

3. Apply a thermometer to measure the temperature of standard buffer solutions as pH is changed as temperature changes. Thus, please refer to standard buffer pH vs temperature table to set a correct pH value for calibration.

4. Wash the electrode with distilled water. 5. Place the electrode into a vessel with pH7.0 standard buffer solution and shake it slightly for

several seconds until pH value remains stable. Adjust the pH value with CALIB knob by referring pH standard buffer table.

6. Remove the electrode and rinse it with distilled water, and then place it into a vessel with pH4.00 standard buffer solution and shake it slightly for several seconds.

7. When the readings become stable, adjust the pH value with CALIB knob by referring pH standard buffer table.

8. Repeat step 5-8 until the calibration values are correct. After adjustment, do not turn CALIB and SLOPE knob.

9. Press (Note 1) and wait until “STDBY” sign disappears and pH sign ceases twinkling, which means calibration is complete and calibration data is stored. It will go back to measurement mode automatically with relay & analog output on and ready for new measurement.

10. Remove the electrode and rinse it with distilled water, and then put it into sample solution.

Note: (1) After calibration is complete, it is a must to press to confirm that calibration data has been stored. If without pressing it, calibration data will not be stored and it will go back to measurement mode in 20 minutes automatically and a new measurement still follows previous calibration data.

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(2) If a sign “----“ on top of display and measuring value are shown in turn, it suggests that CALIB knob has reached a mechanical boundary; nevertheless, if a sign “----“ on bottom of display and measuring value are shown in turn, it suggests that SLOPE knob has reached a mechanical boundary. If it shows " " on display, it suggests that both CALIB and SLOPE have reached their mechanical boundary. It is available for user to turn the knob in a reverse way if abovementioned conditions occur. If it still fails to reach a desired calibration value, it means that a shift to zero-point potential or slope is way much. It is recommended to use new pH standard buffers or conduct maintenance for pH electrodes. Replace the pH electrode if above two methods fail.

5.2 Inspection of ORP electrode:

ORP electrodes require ORP standard buffers to check & adjust its relative potential. 1. Switch to ORP measurement mode. 2. Press to enter calibration mode. It shows current measuring value and STDBY sign

with mV sign twinkling on display. At the moment, relay is turned off, analog output will remain what it was prior to HOLD status and start calibration.

3. Rinse the electrode with distilled water, place it into a known ORP standard buffer and adjust CALIB knob until it reaches a correct ORP value.

4. Open the backboard of the unit and install a jumper between GLASS and REF terminals to have them short-circuited. Turn the CALIB knob until it shows 0mV and then remove the jumper.

°C 9891 standard buffer at 25°C, 220mV±5%

10 245mV 20 228mV 25 220mV 30 212mV 40 195mV 50 178mV 60 160mV 70 142mV

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5. Press (Note 1) and wait until “STDBY” sign disappears and mV sign ceases twinkling, which means calibration is complete and calibration data is stored. It will go back to measurement mode automatically with relay & analog output on and ready for new measurement.

6. Remove the electrode and rinse it with distilled water, and then put it into sample solution

Note: (1) After calibration is complete, it is a must to press to confirm that calibration data has been stored. If without pressing it, calibration data will not be stored and it will go back to measurement mode in 20 minutes automatically and a new measurement still follows previous calibration data. (2) If a sign “ “ and measuring value are shown in turn on display, it suggests that CALIB knob has reached mechanical boundary. For further adjustment, it is available for user to turn the knob in a reverse way. If it still fails to reach desired calibration value, it is recommended to use new ORP standard buffers or conduct maintenance for ORP electrodes. Replace the ORP electrode if above all method fails.

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6. Setting 6.1 RELAY control setup:

1. Press to enter Hi set point control and it will show “H1” twinkling on display. At the moment, analog output will remain what it was prior to HOLD status, RELAY ceases working but Hi & Lo indicators remains working.

2. Turn Hi knob for adjustment. H1 set point can be set up by adjusting Hi knob to make a test for Hi indicator. Press MODE (Note 1) to store H1 set point value and then enter L1 set point control.

3. Enter L1 set point control. It shows L1 twinkling on display and L1 set point can be set up by adjusting Lo knob to make a test for Lo indicator. Press MODE (Note 1) to store L1 set point value. After that, it will go back to measurement mode with RELAY, analog output on.

4. Regarding the setting of H2 & L2 for PC-320A, it is the same as above H1 & L1.

Note 1: It is available to see Hi/Lo set point value after entering Hi/Lo set point control. It will go back to measurement mode in 2 minutes automatically with previous setting about set point control if without any operation.

Note 2: If a sign “ “ and set point value are shown in turn on display, it means that Hi or Lo knob has reached mechanical boundary or set point has been out of set range. Turn the knob in a reverse way to its original position and resume control point setting.

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6.2 Analog output setting and RELAY test 1. Under measurement mode, an extended press to and release until it shows 4mA on

display. It goes analog output of 4mA at the moment.

2. Press and it shows 20mA on display. It goes analog output of 20mA at the moment.

3. Press to enter H1 RELAY test and there will show on sign & H1 sign on display. Hl RELAY is in action and Hi indicator is lighting at the moment.

4. Press and it will show oFF sign & H1 sign on display. H1 RELAY ceases working and Hi indicator is being turned off at the moment.

5. Press to enter L1 RELAY test and there will show on & L1 signs on display. L1 RELAY is in action and Lo indicator is lighting at the moment.

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6. Press and it will show oFF & L1 signs on display. L1 RELAY ceases working and Lo indicator is being turned off at the moment.

7. Press to return measurement mode. 8. Regarding the setting of H2 & L2 for PC-320A, it is the same as above H1 & L1.

Note: It will automatically go back to measurement mode in 20 minutes if no operation under this mode.

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7. Maintenance

Generally speaking, under normal operation, the transmitter needs no maintenance except regular cleaning and calibration of the electrode to ensure accurate and stable measurement and system operation.

The cleaning cycle for the electrode depends on the pollution degree of the measurement sample. Normally, it is recommended to make weekly cleaning. The following chart gives introductions of different cleaning methods according to different type of contaminations to provide the operators with reference for cleaning and maintenance.

Type of Contaminations Cleaning methods

Measuring solutions containing proteins.

(Contamination of the junction)

The electrode should be soaked in Pepsin/HCl for several hours. METTLER-TOLEDO 9891 Electrode Cleaner is

recommended. Measuring solution containing

sulfides. (The junction becomes black)

The junction should be soaked in Thiourea/HCl solution until being bleached. METTLER-TOLEDO 9892

Electrode Cleaner is recommended. Contamination by grease or organic

substance Short rinsing of the electrode with acetone and

ethanol.

Acid and alkaline soluble contaminations

Rinsing the electrode with 0.1mol/l NaOH or 0.1mol/l HCl for a few minutes.

Apply clean water to flash the electrode after above cleaning steps and immerse the electrode in 3M KCl solution for 15 minutes at least, and then calibrate the electrode.

The electrode should only be rinsed and never rubbed or otherwise mechanically cleaned, since this would lead to electrostatic charges. This could cause an increase in the response time.

In cleaning the platinum electrode, the platinum ring of the electrode can be rubbed gently with a wet soft piece of cloth.

Note: The frequency of electrode cleaning depends on the type and degree of contamination;

however, it is recommended that the electrode be cleaned once a week.

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SUNTEX INSTRUMENTS CO., LTD.

13F, No. 31, Lane 169, Kangning St., Xizhi Dist., New Taipei City, Taiwan (R.O.C.) Tel: 886-2-2695-9688 Fax: 886-2-2695-9693 e-mail: suntex@ms1.hinet.net www.suntex.com.tw/en

5040E PC-300A/Technical data subject to alternations/ Quality Systems ISO 9001/201812