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Section 2
Page 47
Wiring the pH Sensor
Note: Route wires through
NEMA-approved conduit hubs
(Cat. No. 16483) to ensure
that water and dust do not enter
the enclosure.
4. Attach a NEMA-approved conduit or compression fitting to one of the
½ in. openings on the bottom of the instrument, and route the modem
cable wires through this opening.
5. Strip insulation ¼ in. from the modem leads.
6. Connect wires to the proper screw terminal block (TB2) as shown
in Table 11 and Figure 20.
7. To ensure protection against electrical shock, reinstall the protective cover
(Cat. No. 49170-00) over the modem terminal connections.
Figure 20 Modem Wiring Connections
2.15 Wiring the pH Sensor
The pre-amp junction box (Cat. No. 9708300) is used to connect the pH probe
to the 980 Flow Meter. The pH probe wires attach to a terminal strip in the
junction box.
2.15.1 pH Junction Box to Instrument
To connect the pH junction box to the 980 Flow Meter follow the steps below
and refer to Figure 21.
1. Disconnect ac power from the 980 Flow Meter. See warning information in
Wiring Safety Information on page 31.
Table 11 Modem Terminal Block Connections (TB2)
Pin Signal Description
1tip
2ring
1. Protective Cover for TB2 2. Cable to Modem
J12
J13
TB8
XMIT+
CH A+CH 4
RAIN+
1
1
1
XMIT–
RCV+
RCV–
SHEILD
AVTB11
TB10 4-20 mA
TB 9 ANALOG
TB4
RAIN
COMMON
CH A–COMMONRAIN–
+12V
SHIELDSHIELDSHIELD
DEPTH–
CH B+CH 5CH 1
DEPTH+
CH B–COMMONCOMMON
SHIELD
SHIELDSHIELDSHIELD
COMMON
STARTCH 6CH 2
DSR
PULSECOMMONCOMMON
RXD
BOTTLESHIELDSHIELD
SHIELD
SHIELD
TOTALIZER
TB7
TB6
TB2
TB5
TOTAL –
RTD –
RING
TIP
TOTAL +
1
1
MODEM
ULTRASONIC
RTD
TIP
RING
RTD
DTR
EVENTCH 7CH 3
TXD
COMMONCOMMONCOMMON
+12V
SHIELDSHIELDSHIELD
RS232C
SAMPLERANALOGANALOG
1
1
1
1
2
2
2
2
3
3
3
3
4
4
4
4
5
5
5
5
6
6
6
6
7
7
7
7
8
8
8
8
9
9
9
9
10
10
10
10
11
11
11
11
12
12
12
12
1314 15 16
SHIELD
TB3
pH
REF
pH
RTD
–5V
COMMON
+5V
485A
485B
485+NO
NO
NO
NO
485GNDCOM RELAY 1
COM RELAY 2
COM RELAY 3
COM RELAY 4
SHIELDNC
NC
NC
NC
RS485
1 2 3 4 5 6 7 8 9 10 1112
F2
F1
HOT/1
NEU/2
T,1.0A 250V
ON
HOT/1
NEU/2
TB8
1
4
7
10
2
5
8
11
3
6
9
12
J13
J12
J13
TB8
XMIT+
CH A+CH 4
RAIN+
1
1
1
XMIT–
RCV+
RCV–
SHEILD
AVTB11
TB10 4-20 mA
TB 9 ANALOG
TB4
RAIN
COMMON
CH A–COMMONRAIN–
+12V
SHIELDSHIELDSHIELD
DEPTH–
CH B+CH 5CH 1
DEPTH+
CH B–COMMONCOMMON
SHIELD
SHIELDSHIELDSHIELD
COMMON
STARTCH 6CH 2
DSR
PULSECOMMONCOMMON
RXD
BOTTLESHIELDSHIELD
SHIELD
SHIELD
TOTALIZER
TB7
TB6
TB2
TB5
TOTAL –
RTD –
RING
TIP
TOTAL +
1
1
MODEM
ULTRASONIC
RTD
TIP
RING
RTD
DTR
EVENTCH 7CH 3
TXD
COMMONCOMMONCOMMON
+12V
SHIELDSHIELDSHIELD
RS232C
SAMPLERANALOGANALOG
1
1
1
1
2
2
2
2
3
3
3
3
4
4
4
4
5
5
5
5
6
6
6
6
7
7
7
7
8
8
8
8
9
9
9
9
10
10
10
10
11
11
11
11
12
12
12
12
1314 15 16
SHIELD
TB3
pH
REF
pH
RTD
–5V
COMMON
+5V
485A
485B
485+NO
NO
NO
NO
485GNDCOM RELAY 1
COM RELAY 2
COM RELAY 3
COM RELAY 4
SHIELDNC
NC
NC
NC
RS485
1 2 3 4 5 6 7 8 9 10 1112
F2
F1
HOT/1
NEU/2
T,1.0A 250V
ON
HOT/1
NEU/2
TB8
1
4
7
10
2
5
8
11
3
6
9
12
J13
1
TB2
RING
MODEM
TIP
1
2
POWER
OFF
No Connection