TPS miniCHEM-pH - Terminal connections when 12 V DC option is fitted

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11.3 Terminal connections when 12V DC option is fitted
Terminal No. Connection Colour
1 12K ATC Sensor * Black
2 12K ATC Sensor * Clear
3 Solution Guard Green of ATC Sensor
OR:
Solution guard rod, if no
ATC Sensor is installed.
4 No Connection
5 pH Reference Black
6 pH Signal Clear
7 +ve of current or voltage output Customer-defined
8 -ve of current or voltage output Customer-defined
9 No Connection
10 Normally Closed contact of
(optional) relay output
Customer-defined
11 Common contact of (optional) relay
output
Customer-defined
12 Normally Open contact of
(optional) relay output
Customer-defined
13 No connection for 12V DC version.
14 Negative of 12V DC Input Customer-defined
15 No connection for 12V DC version.
16 No connection for 12V DC version.
17 No connection for 12V DC version.
18 Positive of 12V DC Input Customer-defined
∗∗ If an ATC sensor is not fitted, then a 12K resistor may be connected between
terminals 1 and 2 to simulate 25
o
C. If this is done, then a stainless steel
solution guard rod must be connected to terminal 3.