Page 11
3.4 Terminal Connections
Note: The power connections detailed below are for normal mains power. Refer
to section 10.7 for power wiring details when the 12V DC power option is fitted.
Terminal No. Connection
Colour
1
ATC Sensor for ppM operation
Red
2
ATC Sensor for ppM operation
Blue
3
No Connection
4
Common
Black
5
DO
2
Sensor Anode
Green
6
DO
2
Sensor Cathode
Yellow
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 10.7.
Brown (standard colour)
15
240V AC Earth input
Green (standard colour)
16
Duplicate 240V AC Earth contact.
See section 10.7.
Green (standard colour)
17
240V AC Neutral input
Blue (standard colour)
18
Duplicate 240V AC Neutral
contact. See section 10.7.
Blue (standard colour)
∗∗
The ATC connection to terminals 1 & 2 is only for when the unit is reading
ppM (mg/L) units.
DO NOT
connect these for % Saturation readout.
