Sigma 980 Operating And Maintenance Manual page 50

Section 2
Figure 21 Junction Box to Instrument
No Connection
POWER
OFF
Page 48
Wiring the pH Sensor
2. Use a large flat-blade screwdriver to loosen the two screws securing the
980 Flow Meter cover. Open the cover.
3. Strip the insulation from the pH junction box leads ¼ inch.
4. Route the cable (Cat. No. 9708800) from the pH junction box through a
NEMA-rated compression fitting (Cat. No. 16483) or conduit to one of the
½ in. openings on the bottom of the 980 Flow Meter.
5. Connect the wires to the proper screw terminal blocks (TB3). Refer to
Table 12 and Figure 21.
Table 12 pH Terminal Block Connections (TB3)
Pin
1
2
3
4
5
6
7
ON ON
F1 F1
T, 1.0A 250V T, 1.0A 250V
HOT/ 1 HOT/ 1 HOT/ 1 HOT/ 1
J12 J12
NEU/ 2 NEU/ 2 NEU/ 2 NEU/ 2
Signal Description
shield
reference
pH
RTD
- 5 V dc
common
+ 5 V dc
TB3 TB3 TB3 TB3 pH pH
MODEM MODEM TB4 TB4 TB 9 ANALOG TB 9 ANALOG
RAIN RAIN
TB2 TB2
1 1
1 1
RING RING
SHIELD SHIELD
RAIN+ RAIN+
NO NO
TIP TIP
REF REF RAIN– RAIN–
COM RELAY 4 COM RELAY 4 1 1
RING RING
pH pH SHIELD SHIELD
NC NC
TIP TIP
RTD RTD CH 1 CH 1
TB5 TB5
NO NO
ULTRASONIC ULTRASONIC
–5V –5V GROUND GROUND
F2 F2
COM RELAY 3 COM RELAY 3
GROUND GROUND SHIELD SHIELD
1 1 TB6 TB6
NC NC
+5V +5V CH 2 CH 2
RTD RTD
NO NO
RTD RTD RTD – RTD –
GROUND GROUND
485A 485A
COM RELAY 2 COM RELAY 2
SHIELD SHIELD
SHIELD SHIELD
485B 485B
NC NC
1 1
NO NO 485+ 485+ CH 3 CH 3
TOTAL + TOTAL +
COM RELAY 1 COM RELAY 1 485GND 485GND GROUND GROUND
TOTAL – TOTAL –
NC NC SHIELD SHIELD SHIELD SHIELD
SHIELD SHIELD
RS485 RS485 ANALOG ANALOG
TB7 TB7
TOTALIZER TOTALIZER
3328 pH 0293 02
Wire Color
clear
black
brown
red
orange
yellow
green
TB11 TB11 AV AV
SHEILD SHEILD
RCV– RCV–
TB10 TB10 4-20 mA 4-20 mA
CH 4 CH 4 CH A+ CH A+
RCV+ RCV+
GROUND GROUND CH A– CH A– XMIT– XMIT–
SHIELD SHIELD SHIELD SHIELD XMIT+ XMIT+
CH 5 CH 5 CH B+ CH B+ GROUND GROUND
GROUND GROUND CH B– CH B– +12V +12V
SHIELD SHIELD SHIELD SHIELD
DEPTH– DEPTH–
CH 6 CH 6 START START DEPTH+ DEPTH+
GROUND GROUND PULSE PULSE SHIELD SHIELD
SHIELD SHIELD BOTTLE BOTTLE GROUND GROUND
CH 7 CH 7 EVENT EVENT DSR DSR
GROUND GROUND GROUND GROUND RXD RXD
SHIELD SHIELD SHIELD SHIELD DTR DTR
ANALOG ANALOG SAMPLER SAMPLER
TXD TXD
+12V +12V
RS232C RS232C