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3.4 Terminal Connections
Note: The power connections detailed below are for normal mains power. Refer
to section 11.3 for power wiring details when the 12V DC power option is fitted.
Terminal No. Connection
Colour
1
12K ATC Sensor *
Black
2
12K ATC Sensor Common *
Clear
3
Solution Guard
Green of ATC Sensor
OR:
Solution guard rod, if no
ATC Sensor is installed.
4
pH Shield (if fitted)
Green
5
pH Reference
Black
6
pH Signal
Clear or White
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
240V AC Active input
Brown (standard colour)
14
Duplicate 240V AC Active contact.
See section 11.3.
Brown (standard colour)
15
240V AC Earth input
Green (standard colour)
16
Duplicate 240V AC Earth contact.
See section 11.3.
Green (standard colour)
17
240V AC Neutral input
Blue (standard colour)
18
Duplicate 240V AC Neutral
contact. See section 11.3.
Blue (standard colour)
∗∗
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 ...