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Mounting and operating instructions

DSTHX-2 COMBINED TEMPERATURE AND RELATIVE HUMIDITY DUCT TRANSMITTER

www.sentera.euMIW-DSTHX-2-EN-000 - 29 / 11 / 2018 2 - 10

Table of contents

SAFETY AND PRECAUTIONS 3

PRODUCT DESCRIPTION 4

ARTICLE CODES 4

INTENDED AREA OF USE 4

TECHNICAL DATA 4

STANDARDS 4

OPERATIONAL DIAGRAMS 5

WIRING AND CONNECTIONS 5

MOUNTING & OPERATING INSTRUCTIONS IN STEPS 5

OPERATING INSTRUCTIONS 8

MODBUS REGISTER MAPS 9

VERIFICATION OF INSTALLATION INSTRUCTIONS 10

TRANSPORT AND STORAGE 10

WARRANTY AND RESTRICTIONS 10

MAINTENANCE 10

DSTHX-2 COMBINED T AND rH DUCT TRANSMITTER


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SAFETY AND PRECAUTIONS

Read all the information, the datasheet, mounting and operating instructions and study the wiring and connection diagram before working with the product. For personal and equipment safety, and for optimum product performance, make sure you entirely understand the contents before installing, using, or maintaining this product.

For safety and licensing (CE) reasons, unauthorised conversion and / or modifications of the product are inadmissible.

The product should not be exposed to abnormal conditions, such as: extreme temperatures, direct sunlight or vibrations. Long-term exposure to chemical vapours in high concentration can affect the product performance. Make sure the work environment is as dry as possible; avoid condensation.

All installations shall comply with local health and safety regulations and local electrical standards and approved codes. This product can only be installed by an engineer or a technician who has expert knowledge of the product and safety precautions.

Avoid contacts with energised electrical parts; always treat the product as if it is live. Always disconnect the power supply before connecting, servicing or repairing the product.

Always verify that you apply appropriate power supply to the product and use appropriate wire size and characteristics. Make sure that all the screws and nuts are well tightened and fuses (if any) are fitted well.

Recycling of equipment and packaging should be taken into consideration and these should be disposed of in accordance with local and national legislation / regulations.

In case there are any questions that are not answered, please contact our technical support or consult a professional.




PRODUCT DESCRIPTION

The DSTHX-2 series are dual duct transmitters which measure temperature and relative humidity. They feature a wide range of low voltage power supply and two analog / modulating outputs. All parameters are accessible via Modbus RTU.

ARTICLE CODES

Code Supply

DSTHG-2 18—34 VDC / 15—24 VAC ±10 %

DSTHF-2 18—34 VDC

INTENDED AREA OF USE

Monitoring duct temperature and relative humidity in HVAC applications

TECHNICAL DATA

■ Selectable temperature range: 0—50 °C ■ Selectable relative humidity range: 5—85 % ■ Accuracy: ±0,4 °C (0—50 °C); ±3 % rH (5—85 % rH), depending on the selected parameter ■ Modbus RTU communication ■ Maximum power consumption:

► DSTHF-2: 1,68 W ► DSTHG-2: 1,8 W (VAC) / 1,68 W (VDC)

■ Nominal power consumption in normal operation: ► DSTHF-2: 1,26 W ► DSTHG-2: 1,35 W (VAC) / 1,26 W (VDC)

■ Imax: ► DSTHF-2: 70 mA ► DSTHG-2: 75 mA (VAC) / 70 mA (VDC)

■ Bootloader for updating the firmware via Modbus RTU communication ■ Minimum airflow velocity required: 1 m/s ■ Enclosure and probe material:

► ASA, grey (RAL9002) ■ Protection standard: Enclosure: IP54, Probe: IP20 ■ Operating ambient conditions:

► temperature: 0—50 °C ► rel. humidity: 5—85 % rH, (non-condensing)

■ Storage temperature: -10—60 °C

STANDARDS

■ EMC Directive 2014/30/EC: ► EN 61326-1:2013 Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 1: General requirements

► EN 61326-2-3:2013 Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 2-3: Particular requirements - Test configuration, operational conditions and performance criteria for transducers with integrated or remote signal conditioning

■ WEEE Directive 2012/19/EC ■ RoHs Directive 2011/65/EC




OPERATIONAL DIAGRAMS

Analog Output 1 [%]

100

0 Min Range

Max Range

50 T [°C]

Analog Output 2 [%]

100

0 5 Min Range

Max Range

85 rH [%]

WIRING AND CONNECTIONS

Article type DSTHF-2 DSTHG-2

VIN 18—34 VDC 18—34 VDC 15—24 VAC ±10%

GND Ground Common ground* AC ~*

A Modbus RTU (RS485), signal A Modbus RTU (RS485), signal A

/B Modbus RTU (RS485), signal /B Modbus RTU (RS485), signal /B

AO1 Analog / modulating output 1 for temperature measurement (0—10 VDC / 0—20 mA / PWM)

Analog / modulating output 1 for temperature measurement (0—10 VDC / 0—20 mA / PWM)

GND Ground AO1 Common ground*

AO2Analog / modulating output 2 for relative

humidity measurement (0—10 VDC / 0—20 mA / PWM)

Analog / modulating output 2 for relative humidity measurement (0—10 VDC / 0—20 mA / PWM)

GND Ground AO2 Common ground*

Connections Spring contact terminal blocks, cable cross section: 1,5 mm2

* Caution: Never connect the common ground of G type articles to other devices powered by a DC voltage. If an AC power supply is used with a unit on a Modbus network, the GND terminal should NOT BE CONNECTED to other units on the network or via the CNVT-USB-RS485 converter. This may cause permanent damage to the communication semiconductors and / or the computer!

MOUNTING & OPERATING INSTRUCTIONS IN STEPS

Before you start mounting the DSTH -2 duct transmitter, read carefully “Safety and Precautions”.

Follow these steps:1. When preparing to mount the DSTH -2, bear in mind that the unit itself must be

installed onto the outer surface of the duct both via fixing the flexible flange or directly the unit enclosure, while the probe must be inserted inside the duct, see Fig. 1 and Fig. 2 below.




Fig. 1 Mounting dimensions

With flange Without flange

60

Ø 122x Ø 5

86,8

18,5

42,3

50

285

34,5

4x Ø 4,470

66

100

105 80

Fig. 2 Mounting position

Correct Incorrect

AIR FLOW AIR FLOW

2. Having selected the appropriate mounting location, proceed with the following steps:2.1 Drill a Ø 13 mm hole into the duct and insert the probe. Apply an air-tight

sealing between probe and duct. 2.2 Fix the flange onto the duct outer surface using the self-drilling screws

delivered with the unit. If you do not intend to use the flange, insert the tube and fix the enclosure onto the duct. Mind the airflow direction (see Fig. 2 and Fig. 3).




Fig. 3 Mounting requirements

7,5*D(1) 3,5*D

(1)D = Duct diameter

ATTENTION Installation requirements: The DSTH -2 must not be installed in turbulent air zones. Ensure sufficiently long settling zones upstream and downstream of the tapping point. A settling zone consists of a straight section of pipe or duct with no obstructions. Avoid installation near filters, cooling coils, fans, etc. The sensor will achieve the optimal result when the measurement is taken at least 7,5 duct diameters downstream and at least 3 duct diameters upstream from any turns or flow obstructions.

ATTENTION Installation of the unit near high EMI-emitting devices may lead to faulty measurements. Use shielded wiring in areas with high EMI.

ATTENTION Keep at least 15 cm distance between the sensor lines and the 230 VAC power lines.

2.3 Install the tube at the desired depth and, in case you use the flange, fix it via the plastic white screw in the flexible flange.

2.4 Unscrew the cover of the unit to remove it and insert the connecting cables through the cable gland of the unit.

2.5 Do the wiring according to the information in section “Wiring and connections” adhering to Fig. 4 below.

Fig. 4 Wiring and connections

Analog / modulating 1 (0—10 VDC / 0—20 mA / PWM)

Modbus RTU

A/B

Supply voltage

DSTHF-2: 18—34 VDC

DSTHG-2: 18—34 VDC / 15—24 VAC ±10 %

Analog / modulating output 2 (0—10 VDC / 0—20 mA / PWM)

ATTENTION Do not exceed the maximum power supply rating! Measure before installation! Unregulated 24 VAC supply units provide higher nominal output voltage and activate the integrated fuse protection.




3. Customise the factory settings to the desired ones via the 3SModbus software or Sensistant (if necessary). For the default factory setting see Table Modbus register maps.

Optional settings If your unit is the first or the last unit on the Modbus RTU network (see Example 1 and Example 2), enable the NBT resistor via 3SModbus or Sensistant (Holding Register 30). If your device is not an end device, leave the NBT disabled (default Modbus setting).

Example 1 Example 2

RX

ТX

NBT

NBT

NBT

Slave 2Master

Slave n

Slave 1

Slave 2Slave 1

RX

ТX

NBT

NBT

Master

Slave n

4. Close the enclosure and secure the cover. 5. Switch on the power supply.

CAUTION Do not expose to direct sunlight!

OPERATING INSTRUCTIONS

Calibration procedure:Both the relative humidity and temperature sensor elements are factory calibrated. Recalibration is not necessary.

BootloaderThanks to the bootloader functionality, the sensor firmware can be updated via Modbus RTU communication. To enter “Boot mode”, put a jumper onto pins 3 and 4 of the P1 header and restart the power supply (see Fig. 5). Once ‘Boot mode’ is activated, the firmware can be updated via SM Boot application (part of 3SModbus software suite) or Sensistant.

Fig. 5 P1 header

1 2 3 4 5

Put a jumper onto pins 1 and 2 and wait for at least 5 seconds to reset the Modbus

communication parameters

1 2 3 4 5Put a jumper onto pins 3 and 4 and restart

the supply to enter bootloader mode




MODBUS REGISTER MAPS

INPUT REGISTERSData type Description Data Values

1 Temperature signed int. Actual temperature level -300—700 500 = 50,0 °C

2 Relative humidity unsigned int. Actual relative humidity level 0—1.000 1.000 = 100,0 % rH

3 Dew point signed int. Calculated dew point -700—700 200 = 20,0 °C

4—10 Reserved, return ‘0’.

11 Output value 1 (temperature) unsigned int. Output value for temperature (T) 0—1.0000 =

1.000 = 0 %

100 %

12 Output value 2 (relative humidity) unsigned int. Output value for relative humidity (rH) 0—1.0000 =

1.000 = 0 %

100 %

13 Reserved, returns ‘0’.

14 Temperature alert flag unsigned int.Flag indicates that measured temperature is outside set alert values. Set to ‘1’ when the measured value is outside the temperature alert values defined by holding registers 20 and 21.

0—10 = 1 =

Measured temperature is OKMeasured temperature is too high/ low

15 Relative humidity alert flag unsigned int.Flag indicates that measured relative humidity is outside set alert values. Set to ‘1’ when the measured value is outside the relative humidity alert values defined by holding registers 22 and 23.

0—10 = 1 =

Measured rH is OKMeasured rH is too high/ low


17 Temperature range limit flag unsigned int.

Flag indicates that measured temperature is outside set range limit values. Set to ‘1’ when the measured value is outside the temperature range limit values defined by holding registers 14 and 15.

0—10 = 1 =

Temperature range is OKTemperature range is too high/ low

18Relative humidity range limit flag

unsigned int.

Flag indicates that measured relative humidity is outside set range limit values. Set to ‘1’ when the measured value is outside the relative humidity limit range values defined by holding registers 16 and 17.

0—10 = 1 =

rH range is OKrH range is too high/ low


20Humidity / temperature sensor fault

unsigned int.Flag indicates if the communication with the temperature and humidity sensor is lost.

0—10 = 1 =

NoYes

HOLDING REGISTERSData type Description Data Default Values

1 Device slave address unsigned int. Modbus device address 1—247 1

2 Modbus baud rate unsigned int. Modbus communication baud rate 0—6 2

0 =1 = 2 = 3 = 4 =5 =6 =

4.8009.600

19.20038.400 57.600

115.200230.400

3 Modbus parity mode unsigned int. Parity check mode 0—2 10 =1 = 2 =

8N1 8E18O1

4 Device type unsigned int. Device type (Read only) DSTHX-2 = 1095

5 HW version unsigned int. Hardware version of the device (Read only) XXXX 0x0100 = HW version 1.00

6 FW version unsigned int. Firmware version of the device (Read only) XXXX 0x0100 = FW version 1.00

7 Reserved, returns “0”.

8 Output 1 overwrite (T) unsigned int. Enables the direct control over the temperature output 0—1 0

0 =1 = 3 =

DisabledEnabled

9 Output 2 overwrite (rH) unsigned int. Enables the direct control over the relative humidity output 0—1 0

0 =1 = 3 =

DisabledEnabled


11 Output 1 type (T) unsigned int. Select analog / modulating output 1 (T)type 1—3 11 =2 = 3 =

1—10 VDC0—20 mA3 = PWM

12 Output 2 type (rH) unsigned int. Select analog / modulating output 2 (rH) type 1—3 11 =2 = 3 =

1—10 VDC0—20 mA3 = PWM


14 Minimum temperature range unsigned int.Minimum value of the temperature range; cannot be set higher than max. temperature range minus 5ºC

0 — (Max. range - 50) 0 100 = 10,0 °C

15 Maximum temperature range unsigned int.Maximum value of temperature range; cannot be set lower than min. temperature rang e plus 5ºC

(Min. range + 50) – 500 500 500 = 50,0 °C

16 Minimum relative humidity range unsigned int. Minimum value of the rH range; cannot be set

higher than max. rH range minus 5 % 50 — (Max. range — 50) 50 200 = 20,0 % rH

17 Maximum relative humidity range unsigned int. Maximum value of rH range; cannot be set

lower than min. rH range plus 5% (Min. range + 50) – 850 850 850= 85,0 % rH

18—19 Reserved, return “0”.

20 Minimum temperaturealert unsigned int. Minimum temperature alarm value Min. temperature range — Max.

temperature alarm 0 100 = 10,0 ºC




HOLDING REGISTERS

21 Maximum temperature alert unsigned int. Maximum temperature alarm value Min. temperature alarm — Max. temperature range 500 500 = 50,0 ºC

22 Minimum relative humidity alert unsigned int. Minimum relative humidity alarm value Min. relative humidity range —

Max. relative humidity alarm 50 200 = 20,0 % rH

23 Maximum relative humidity alert unsigned int. Maximum relative humidity alarm value Min. relative humidity alarm —Max.

relative humidity range 850 850 = 85,0 % rH

24—26 Reserved, return “0”.

27Internal voltage source selectionOutput 1 (T)

unsigned int. Selection of internal voltage source for PWM output 1 0—1 0 0 =

1 = 3,3 VDC12 VDC

28Internal voltage source selectionOutput 1 (rH)

unsigned int. Selection of internal voltage source for PWM output 2 0—1 0 0 =

1 = 3,3 VDC12 VDC


30 Modbus network resistor termination (NBT) unsigned int. Set device as ending the line or not by

connecting NBT 0—1 0 0 = 1 =

NBT disconnectedNBT connected

31 Output 1 overwrite value (T) unsigned int. Overwrite value for output 1. Active only if Holding register 8 is set to 1 0—1.000 0 0 =

1.000 = 0%

100%

32 Output 2 overwrite value (rH) unsigned int. Overwrite value for output 2. Active only if

Holding register 9 is set to 1 0—1.000 0 0 = 1.000 =

0%100%

33—35 Reserved, return “0

36 Modbus registers reset unsigned int.Resets Modbus Holding registers to default values. When finished this register is automatically reset to ‘0’

0—1 0 0 = 1 =

IdleReset Modbus registers

37—40 Reserved, return “0”

If you want to find out more about Modbus over serial line, please visit: http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf

VERIFICATION OF INSTALLATION INSTRUCTIONS

If your unit does not function as expected, please check the connections.

TRANSPORT AND STORAGE

Avoid shocks and extreme conditions; store in original packing.

WARRANTY AND RESTRICTIONS

Two years from the delivery date against defects in manufacturing. Any modifications or alterations to the product after the date of publication relieve the manufacturer of any responsibilities. The manufacturer bears no responsibility for any misprints or mistakes in this data.

MAINTENANCE

In normal conditions this product is maintenance-free. If soiled, clean with a dry or damp cloth. In case of heavy pollution, clean with a non-aggressive product. In these circumstances the unit should be disconnected from the supply. Pay attention that no fluids enter the unit. Only reconnect it to the supply when it is completely dry.


http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf

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