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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.
Summary of Contents for miniCHEM-pH
Page 4: ...Page 4 1 Introduction 1 1 miniCHEM pH Illustration ...
Page 28: ...Page 28 ...