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TRANSCRIPT
A CONTINUOUS WATER-SAMPLING AND MULTIPARAMETER^MEASUREMENT SYSTEM
FOR ESTUARIES : AN IMPROVED SYSTEM FOR SMALL VESSELS
By Lee A. Dedini and Laurence E. Schemel
U. S. GEOLOGICAL SURVEY
Open-File Report 80-1293
Prepared as part of continuing
San Francisco Bay estuarine study
October 1980
UNITED STATES DEPARTMENT OF THE INTERIOR
CECIL D. ANDRUS, Secretary
GEOLOGICAL SURVEY
H. William Menard, Director
OPEN-FILE REPORT
For additional information write to:
Regional Hydrologist Water Resources Division U. S. Geological Survey 345 Middlefield Road Menlo Park, CA 94025
CONTENTS
Page
List of Tables. ...................... 4
List of Figures ...................... 5
Abstract ......................... 6
Introduction. ....................... 7
Water Pumps ........................ 8
Digital-Display Panels and Instruments. .......... 9
Analog Strip-Chart Recorders. ............... 13
References ........................ 14
Tables .......................... 15
Figures .......................... 24
List of Tables
Page
1. Manufacturers of instruments and equipment ....... 15
2. Instrument signal level characteristics ........ 16
3. Identification and sources of major components ofdisplay panels ..................... 17
4. Identification and sources of major components ofrecorders ....................... 18
5. Panel 1: front panel connections ............ 19
6. Panel 1: rear panel connections ............ 20
7. Panel 2: front panel connections ............ 21
8. Panel 2: rear panel connections ............ 22
9. HP 25C program for OmV pH calculation ......... 23
List of Figures
Page
1. Water pumping system on R.V. Estero ........... 24
2. Block diagram of continuous measurement instruments anddata aquisition system .................. 25
3. Front view layout: Panel 1 ................ 26
4. Top view layout:. Panel 1 ................. 27
5. Top view: Panel 1 .................... 28
6. Circuitboard CB1 (Panel 1)or (Panel 2) schematic diagram . 29
7. Circuitboard CB2 (Panel 1) schematic diagram ....... 30
8. Circuitboard CB2 (Panel 1) schematic diagram ....... 31
9. Circuitboard CBS (Panel 1) schematic diagram ....... 32
10. Digital panel meter and panel switch connections:Panel 1 . 33
H» In situ temperature/depth probe and bow-intaketemperature schematic diagram .............. 34
12. Front view layout: Panel 2 ................ 35
13. Top view layout: Panel 2 ................. 36
14. Top view: Panel 2 .................... 37
15. Circuitboard CB2 (Panel 2) schematic diagram ....... 38
16. Circuitboard CB3(Panel 2) schematic diagram ....... 39
17. Circuitboard CB4 (Panel 2) schematic diagram ....... 40
18. Digital panel meter and panel switch connections:Panel 2 . 41
19. Infrared analyzer response curves at various gainsettings ......................... 42
20. Block diagram of recorders ................ 43
21. Front view: Recorders .................. 44
22. Front layout of control section: Recorders ........ 45
23. Side view: Recorders ................... 46
24. Side layout of control section: Recorders ........ 47
25. Attenuation and amplifier schematic diagrams: Recorders . . 48
26. Wiring diagram of controls to recorder connectors .... 495
ABSTRACT
Salinity, temperature, turbidity, chlorophyll a_ fluorescence, pCO , ^"" ^
pH, oxygen saturation, and concentrations of five dissolved nutrient
substances (nitrate, nitrite, ammonia, dissolved silica, and ortho-
phosphate) can be continuously measured by instruments in an integrated
system. The system is compact and has been installed on a 30-foot long
shallow-draft vessel capable of navigating in the shallow reaches of San
Francisco Bay estuary. The system was assembled from commercially avail
able instruments, equipment, and components, and from specialized items
which were designed and fabricated by the authors. Near-surface water is
pumped continuously while underway, producing data profiles from one
depth. Data are read from digital meters and recorded on analog strip-
charts and magnetic tape.
Introduction
This report describes the continuous water-sampling and water-
analysis system which has been installed on the 30-foot-long U, S.
Geological Survey research vessel Estero, This system was designed
primarily for mapping water-quality parameters in the shallow regions
of San Francisco Bay estuary. Many features are similar or identical
to the system described by Schemel and Dedini (1979), but this newer
system incorporates many electronic and design improvements and is more
compact, allowing it to be installed on small vessels. In addition, we
have been able to reduce cost, particularly by purchasing OEM (original
equipment manufacturer) components when possible.
We have limited the scope of this report primarily to a description
of the digital-display panels and the analog strip-chart recorders because
these are the assemblies which contain most of the important changes.
However, we do note some other changes in equipment and instrumentation.
Analytical methods, calibration procedures, and other detailed information
can be found in our previous reports (Schemel and Dedini 1979, 1980) and
in the appropriate operation manuals (Table 1) Details of the micro
processor-based data logger and magnetic-tape recording system and the
digital fathometer are described in a following report by K. Leap (U.S.G.S.,
Menlo Park, CA).
WATER PUMPS
Near-surface water from a depth of about 0.5m is continuously
pumped with a flexible-impeller centrifugal pump (Fig. 1). A section
of aluminum pipe (l^j-in.ID) penetrates the hull and extends to above
the water line; water is drawn from a section of PVC pipe(l-in.ID)
inserted through the aluminum pipe. The PVC pipe can be adjusted so
that air or bubbles are not taken in and, as a safety factor, the pipe
will break without damaging the hull if the vessel hits an object. The
intake of the pipe is cut at an angle of about 30 degrees (Fig, 1) to
minimize cavitation and degassing of the water. The pump is coupled to
the PVC pipe with reinforced flexible PVC tubing and is located about 0.5m
above the water line. The pump discharges about 50L rnin,'" ; water which
is not used for the instruments is discharged overboard in order to
minimize the flushing time of the system (approx. 5-10 sec,).
Circuits have been provided in the digital-display panels so that an
in situ pumping system with temperature and depth sensors can be used. We
refer the reader to Schemel and Dedini (1979) for details concerning the
construction and operation of this system.
Digital-Display Panels and Instruments
The pumped water flows through instruments with flow-sample cells
or sensors are directly immersed in the water stream (Fig. 2). The
following discussion will exclude the five-channel nutrient analyzer
(except when specific references are made) because it is practically
independent of the digital-display panels and has separate strips-chart
recorders. Continuous-measurement signals (Table 2) are displayed on
digital meters and are recorded on two four-channel strip-chart recorders,
except for the in situ depth measurement (when used). Amplified or
attenuated signals buffered by amplifiers with 1,5 sec. time constants (RC)
are read by the data logger at switch-selectable multiples of 5 sec.
(usually 30 sec.) and recorded on magnetic tape.
The digital-display panels contain circuitry for sensors and signal-
processing circuits necessary for data recording,. including signals from the
five-channel nutrient analyzer. Drawings and electrical schematic diagrams
for the digital-display panels are Figures 3 through 18. Each panel is
a standard width (19 in.) rack chassis (Table 3). Digital meters, instr-
ment and sensor connectors, and power^and voltage^source switches are
mounted on the front panels. Other signal connections are made at the
rear panel. Circuit components are hand-wired and all connections are
soldered when possible. Most circuit components are mounted on prototype
circuit boards.
Modular regulated supplies power all panel circuitry (+15VDC) and
the digital panel meters (+5VDC). Precise regulated DC voltages are
generated on the circuitboard located by the modular supplies (for example,
(Fig.4)). These voltages are required for sensors and calibrations. For
example, each panel has "Cal" switches which select full-scale voltages
9
for calibrating the digital meters and strip-chart recorders and for
checking the operation of the data logger and magnetic tape recorder.
Both panels provide zero-offset circuits which enable a limited
range of a parameter to be recorded across the full width of the strip-
chart (50mm). For example, temperature changes in the range of 10-20 C
can be recorded with a resolution of *0.1 C. In this case an offset
voltage equivalent to the signal level at 10 C is applied to the low
side of the recorder differential input and the recorder attenuation is
set for a full scale range of 10 C. The rotary switches select the
appropriate voltage offset; they are calibrated in the parameter units or
in percent of full range increments.
The digital-display panels accept and condition signals from instru
ments and sensors. We have changed some of our previous designs to allow
us to use newer or different instruments. A Md.10 fluorometer with a
nephelometry flow cell,or a Md.40 nephelometer,can be connected to the
turbidity channel; a switch on the circuit board selects the appropriate
circuitry. The circuitry design for the pH meter optical isolation and
digital-to-analog converter has been modified to accept TTL-level signals
from a Md. 701A pH meter. An additional (ground^isolated) fSVDC supply is
necessary to power the digital logic. Panel circuitry for the pCO measure
ment system has been modified to accept signals from a Md. 864 non-dispersive
infrared analyzer; response curves are shown in Fig. 19.
All temperature measurements are made with linearized thermistor
sensors. These sensors are connected to circuitry in the panels except for
the intake~temperature and in situ-temperature measurements. In these cases
the circuitry is contained in water-proof enclosures and voltages are
10
transmitted to panel 1. Modifications of the in situ-temperature and depth
circuits are shown on Fig. 11. A zero-depth adjustment is provided on
panel 1.
The dissolved oxygen sensor is a polaragraphic electrode. The probe
is polarized (-0.84VDC) and the resulting current is proportional to the
partial pressure of oxygen in the sample. A thermistor in the probe varies
the amplifier gain to compensate for variations in the membrane diffusivity
with temperature. However, this compensation is inadequate above 22 C, where
most air calibrations are made. We are currently evaluating the merits of
making uncorrected electrode-current measurements and correcting for the
measurement temperature in our data-reduction procedure. Either of two
fixed resistors equivalent to the temperature compensation resistances at
25 C and 12 C can be selected instead of the thermistor. These resistors
will give adequate voltage gain at high or low temperatures.
Our changes in the pH data collection and correction routines are similar
in concept to what we envision for the dissolved oxygen system. The electrode
(cell) potentials and corresponding sample temperatures are collected as
the raw data; our previous data were collected in pH units. Periodic cali~
o brations with 7.413 (@25 C) buffer (Beckman #3008) are made at temperatures
near the sample temperatures. The following calculations are based on the
assumption that the electrode response is nearly theoretical. We check the
response periodically with two buffers to assure that large deviations from
the theoretical response (slope: mV/pH) do not occur.
Within the temperature range of our measurements (0-25 C) the following
expressions can be used:
11
I/Theoretical Slope ( mV/pH ) = 54.1960 + 0,1984 T eq. 1
^ 52 -7 Buffer pH (7.413 @25 C) = 7,531 - 6.65x10 T + 7.64x10 T , eq. 2
where T is the temperature in centigrade degrees.
The pH meter reading in mV is divided by the theoretical slope to give
a ApH. The pH value corresponding to the OmV reading is computed from the
pH meter reading in buffer and the theoretical slope:
,%_ TT i_ ^^ TT (mv reading in buffer) _ OmV pH = buffer pH + - . . ., : r eq. 3(theoretical slope)
Note that mV reading will be negative in the 7.41 buffer. Linear drift
is assumed between calibrations. The sample pH is computed from the OmV
pH and the A pH:
Sample pH = OmV pH - A pH eq. 4
Note that A pH values will be negative because most samples will be more
alkaline than the OmV pH value.
Values are reported to the nearest 0.01 pH unit. We expect that
measurements made by this procedure are accurate at the _ 0.05 pH level
and not suitable for some applications.
I/ Eq. 1 is our fit to the values tabulated in Bates, R.G., 1973, Determination of pH, John Wiley & Sons, New York, 479 p.
2/ Eq. 2 is our fit to the data supplied by the manufacturer for Buffer # 3008 .
3/ This calculation can be easily done on a calculator; a program for the HP 25C (Hewlett-Packard, Palo Alto, CA,) is shown in Table 9,
12
Analog Strip-Chart Recorders
Drawings and electrical schematics diagrams for the four-channel
analog strip-chart recorders are shown in Figures 20 through 26. Each
recorder uses an OEM recorder unit (Table 4). The encased recorders
(Fig. 21) fit on angle brackets inside standard-width (19 in.) electronic
racks. The dimensions of the recorders are 17 1/2 in. wide, 9 1/2 in. high,
and 8 1/2 in.deep. The OEM recorder units comprise: 1) the chassis, 2)
four galvanometers, 3) the paper-drive system, 4) four thermal-writing
styluses, 5) power- and signal-input connections, 6) and power supplies
(Fig. 20). The chassis is mounted on 1/8-in. thick aluminum sheet and
angle material (Fig. 23), and aluminum panels (1/16-in.-thickness) enclose
the control-section components (Fig, 23 does not show the top and side
panels). The front panel fits flush with the chart-paper table. Operating
controls mounted on the front panels (Fig. 22) include those for zero pen
positioning, gain adjustment, pen-heat adjustment, a five-step attenuator
for each channel, power, chart-speed selection, and event marker.
Signal-input connections are made at the rear of the control section
(Fig. 24). Each channel has a differential-input circuit (Fig. 25) which
is mounted on the prototype circuitboard. The single-ended output of each
differential-input circuit is applied to a preamplifier circuit (Table 4),
which increases the sensitivity of the recorders from lOmV/mm to ImV/mm.
13
References
Schemel, L. E. and Dedini, L. A., 1979, A Continuous water-sampling
and multiparameter-measurement system for estuaries: U. S.
Geological Survey Open-file Report 79-273 , 92p.
Schemel, L. E. and Dedini, L. A., 1980, Continuous water-sampling and
water analysis in estuaries in Proceedings of Fifth STD/Ocean
Systems Conference (in press).
14
I/Table
1.
Manu
fact
urer
s of In
stru
ment
s an
d Equipment-
Item
Model
Bow
Samp
ling
Ce
ntri
fuga
l Pu
mp
777
pH Meter
701A
pH Co
mbin
atio
n El
ectr
ode
4760
50
Four Ch
anne
l An
alog
Recorders, OE
M W402XL
Fluorometers
(2
) 10
-OOO
R
Nephelometer (optional)
40
Salinity-Temperature Me
ter
350
Ther
mist
or El
emen
ts
4401
8
Oxygen Probe
5400
Infrared Ana
lyze
r 864-X
Depth
Transducer
PG10
3
Tape Re
cord
er
4923
Nutrient analyzer
II
(AutoAnalyze
r)
Digital
Fathometer
2700
Manu
fact
urer
Jabsco Pr
oduc
ts,
Costa
Mesa,
California
Orion
Research In
c.,
Cambridge, Ma
ssac
huse
tts
Corning
Inst
rume
nts,
Medfield,
Mass
achu
sett
s
Astr
o-Me
d Di
v.,
Atlo
n-To
l In
d.,
West War
wick
, RI
Turn
er De
sign
s, Palo Alto,
California
Turner Designs, Palo Al
to,
Cali
forn
ia
W. Peterson (C
onsu
ltan
t),
Palo
Al
to,
Cali
forn
ia
Yell
ow Springs Instruments, Ye
llow
Springs,
Ohio
Yell
ow Springs
Inst
rume
nts,
Ye
llow
Spr
ings
, Oh
io
Beckman
Instruments, Fullerton, California
Gentran
Inc.
, Su
nnyv
ale,
Ca
lifo
rnia
Tektronix, In
c.,
Beav
erto
n, Or
egon
Tech
nico
n Corp., Terryt
own,
Ne
w York
Datamarine,
Poca
sset
, MA
.
The mention of
br
and
name
s is for
iden
tifi
cati
on pur
pose
s an
d do
es not
constitute endorsement
by the
U.S.
Geological Su
rvey
.
Table 2. Instrument Signal Level Characteristics.
Measurement
Salinity
Temperature
Depth
Oxygen Saturation
pCC- (infrared analyzer)
pH (meter output)
Fluorescence (Md. 10)
Nephelometer (Md. 40)
Fluorometer sensitivity
0
-5
0
0
0
0
0
0
0
Range
to 39.9
to
to
to
to
to
to
to
to
35°C
100 m
199%
100%
199 mV
100%
100%
1.9 VDC
I/ 2/ VDC Signal to_ VDC Signal- Panel Meters and to Chart Recorders Computer
0
-0
0
0
0
0
0
0
to
.5
to
to
to
to
to
to
3.
to
1.
1.
1.
1.
1.
1.
999
3.
000
99
00
VDC
50 VDC
VDC
VDC
VDC
999 VDC
00
00
VDC
VDC
Same
Same
VDC X 2
VDC X 2
VDC X 2
VDC X 2
VDC X 2
VDC X 2
see below
No Data
AutoAnalyzer channels
nominal
0 to 100%
5.00 VDC
0 to 5.00 VDC
All voltages are positive unless designated.
2/ VDC signal is buffered. Buffer amplifier has a filter with an RCtime constant of 1.5 seconds.
3/ VDC signals for sensitivity scales: Md, 10 Fluorometers (VDC *0,05)
min.sens. =0.03.16 X =0.28
10 X =0.4731.6 X =0.69
100 X316 X
1000 X3160 X
=1.00 =1.28 =1.47 = 1.69
16
Table 3. Identification and Sources of Major Components of Display Panels.
Component
Front Panel Connections
3-pin3-socket4-socket6-socket24-socket
MS 3102A-14S-1P MS 3102A-14S-1S MS 3102A-14S-2S MS 3102A-14S-6S 57-40240
26-pin PTO2A-16-26S
Dual 18-pin 58-2075010
Circuit Boards
Prototype boards
Power Supplies
No. 12-DE-6
Dual supply ±15 VDC 200 ma Md. BPM-15/200
Single +5 VDC 3 AMPS Md. USM-5/3
Single +5 VDC 1 AMP MD.JE200
Digital Panel Meters
0-19.999V Md. DM-4100L
Rotary Switches
Manufacturer
Amphenol Div., Bunker Ramo Oak Brook, IL
Bendix Corp., Southfield, MI
Datel Systems, Inc. Mansfield. MA
Douglas Electronics, San Leandro, CA
Datel Systems, Inc. Mansfield, MA
Jameco Electronics, Belmont, CA
Datel Systems, Inc. Mansfield, MA
1 pol.-12pos. non-shorting Md. PSA-201 1 pol.-12pos. shorting Md. PSA-200
Centralab, Milwaukee, WI
Rack Chassis
19" X 7" X 13" aluminum Md. No. HC-14104
Integrated Circuit
Bud Radio, Inc. Willoughby, OH
Digital to Analog converter12 BitMd. DAC 80-CCD
Burr-Brown Tucson, AZ
17
Table 4. Identification and Sources of Major Components of Recorders,
Component
OEM Strip Chart Recorder
Four Channel MD. W402 XL
Rear Panel Connectors
3 pin Type D3M
3 pin MS 3102A-14S-1P
Rotory Switches
2 pol- 6 pos
1 pol- 11 pos
Potentiometer s
5K ohm No. 3852B-202-502A 10K ohm N0.3852B-202-103A
Rheostat
1 ohm 12*5 W No. 0101
Circuit Boards
Prototype boards No. 12-DE-6
Preamplifier Md. A-10 1 Mv/mm
Manufacturer
Astro-Med Div.., Atlon-Tol Ind, West Warwick, RI
Switchcraft, Chicago, IL
Amphenol Div. Bunker Ramo Oak Brook, IL
Grayhill, Inc., La Grange, IL
Centralab, Milwaukee, WI
Bourns, Inc., Trimpot Div Riverside , CA
Ohmite Co., Skokie, IL
Douglas Electronics, Inc. San Leandro, CA
Astro-Med Div.,, Atlon-Tol Ind. West Warwick, RI
18
Table 5. Panel 1, Front Panel Connections.
Connector Function Pin Connection
J-6
J-7
J-8
J-9
J-10
Salinometerinput
Bowtemperature
sensor
In situT/D probe
Fluorometerinput
Nephelometerinputfor
Model 10 orModel 40
ABC
ABCDE
ABCDEF
ABCDE
ABCDEF
COMS-4S-4
±15
COM-15S-6
J-12-11,23
±15COM-15S-6
CB2COM
CB211111111
CB21111iin
COM
Designation
commonsalinity signal
temperature signal
+15 V common-15 V
Temperature signal shield
+15 V common-15 V
temperature signaldepth signal
shield
signal analog range signalTTL range multiplier
digital logic common +5VDC logic power
same as J-9 for Md. 10
common
(Md, 40 uses only pins A and F)
Note: Underscored connections are at regulated voltage supply.
19
Table 6. Panel 1, Rear Panel Connections.
Connec tor
J-ll
Function
Computer output
Pin
J-12 Recorder output
P-l AC Line
P-2 Auto- Analyzer inputs
1,132,143,154,165,176,187,198,209,21
10,2212,24
1,132,143,154,165,176,187,198,209,21
10,2211,23
AB
COMCB2
nii"n"nn
CB2COM
S-5
CB3CB2COMCB2COMCB2COMS-7
CB3J-7-E
S-l
Power modi
Connec tion Designation
commonsalinity signal
temperature signaldepth signal X 2
fluorometer signal X 2 fluorometer scale nephelometer signal X 2 nephelometer scale +3,5V reference signal No data +5.0 VDC
shield
salinity signal Salinity zero offset
depth signalcommon
fluorometer signalcommon
nephelometer signalcommon
temperature signal temperature zero offset temperature shield
high 115 VAC .e neutral
earth groundpin 1 chassis
CB-3 Channel 12345
COM common
J-13 Auto- Analyzer signals
to computer
A B C D E F
CB3
COM
Channel 12345
common
Note: Underscored connections are at regulated voltage supply,
20
Table 7. Panel 2, Front Panel Connections.
Connec tor
J-5
Function
Infrared Analyzer
input
J-6
J-7
J-8
J-9
J-10
Pin
A B C
pH meter
OxygenProbe
Temperature/ PCO9
Temperature/ PH
Temperature/ Oxygenprobe
ABCDEFGHJKMNP
ABCDE
ABCD
ABCD
ABCD
Connection
J-1-A2
CBS
CB4
Designation
CBSCBS
S- 21 on CBSCBS
J-12- 10,22
CB2 CB2 +3.5 S-2
CB2 CB2+3.5S-2
CB2 CB2 +3.5S-2 "
CommonSignal
N
MSB 123456789
1011
LSB 12
.C.
804020108421
.8
.4
.2
.1100
-0.84 VDC cell input internal thermistor internal thermistor
shield
thermistor red thermistor brown thermistor green
shield
(same as J-8)
(same as J-8)
Note; Underscored connections are at regulated voltage supply.
21
Table 8. Panel 2, Rear Panel Connections.
Connector
J-ll
Func tion
Computer output
Pin Connection
J-12 Recorder output
P-l AC Line
1,132,143,154,165,176,187,19
12, 24
1,132,143,154,165,176,187,198,209,21
10,22
AB
COMCB3CB4CB3CB2CB2CB2
COM
S-4
CB3
CB3S-6
CB3S-10
CB3S-2
J-7-E
S-l
power mocpin 1 chassis
Designation
commonpCO signal X 2 pH signal X 2 % Oxygen signal X 2 temperature/pCO signal temperature/pH signal temperature/D.O. signal
shield
signal pCO :sero offset pH signal pH zero offset % Oxygen signal %Oxygen zero offset selected temperature signal temperature zero offset temperature probe shield oxygen probe shield
high 115 VAC neutral
earth ground
Note: Underscored connections are at regulated voltage supply.
22
I/Table 9. HP 25C Program for OmV pH Calcultion.
Registers
01234567
Buffer pH @ T C calibration0.198454.196Computed theoretical slopeEntered temperature @ pH calibration7.64 x ~6.65 x 107.531
Program
Line
12345678910111213
Sto 4 RC1 1 xRC1 2 +Sto 3 R/S RC1 4 x2
RC1 5 xRC1 4 RC1 6
Line
14151617181920212223242526
x
RC1 7
Sto 0 R/S Enter RC1 3
CLS RC1 0
GTO 00
Instructions
Key T C @ pH calibration Key R/S
Record theoretical slope, if needed Key R/S
Record buffer pH @ T C calibration, if needed Key Calibration data as - (mV reading)
i.e., -25.OmV will be keyed as 25.0 Key R/S
Record OmV pH value
I/ The mention of brand names if for identification purposes and does not constitute endorsement by the U.S. Geological Survey
23
Extr
a
Dis
charg
e
Ove
rboard
Wa
ter
to
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take
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d C
entr
ifugal
Pum
p
Figu
re 1«
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ter
pumping
syst
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n R.V. Es
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NT
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A
MP
LIF
IER
1
mV
/mm
C
IRC
UIT
B
OA
RD
CH
1
CH
2
CH
3
CH
4
RE
AR
115
VA
C
PO
WLR
FU
SE
1.
5 A
S
B.
INP
UT
S
CH
1
CH
2
CH
3
CH
4
Figure 2U.
Side la
yout
of
con
trol
se
ctio
n: Recorders.
DRAWN BY L D
DATE
00
1 S
ign
al
V2
Offse
t V
3 S
hiel
d
Inp
ut
Ch1
2
>
Sensitiv
ity
2pol-6pos.
No
te:
Only
Ch!
sch
em
atic
sho
wn
All
recto
rs 0
.1%
Re
cord
er
Connect
ors
Cha
n 1,
2,3,
4
J1
Fig
ure
Att
enuat
ion
and
am
pli
fier
sch
emat
ic
dia
gra
ms:
R
ecord
ers
DRAW
N BY
0.
DAT
E JM
NE'
SO
Channel 4 J4
Chart Speed1mm/min 5mm/min
Channel 1J1
Off25mm/sec
blk
115VAC 60 Hz.
wht 1 '5A Power
Ogrn
Analog Heat12 1/2 W
Position 5k 1W
Event Marker H:MOM. N.O.
Noie--|npvA"\ ; heo\ position
16
19
220
18
5
14
12
17
41
Figure 26. Wiring diagram of controls to recorder connectors.
DRAWN BY L.O.
DATE JiANE'90
49