Measurement Alarm Relays - Hach ORBISPHERE 51 Series User Manual

Installation
Analog inputs (when ext. press. sensor is
directly connected)
14. GND
15. Green: Input ext. press. sensor P+
16. White: Input ext. press. sensor P-
17. Red: Output ext. press. sensor +
18. Black: Ground (GND)
Note: On multi channel systems, the external pressure sensor must be wired to the channel 1
measurement board, but the signal is used to compensate all channels.
3.7

Measurement alarm relays

The following table shows the relay number associated with the numbered connection for each
sensor type:
32
Sensor type Relay 1
J14
LDO
TC
Analog inputs (when ext. press. sensor
extension, Part N° 32548.xx, is used)
12. GND
13. Green: Input ext. press. sensor P+
14. Yellow: Input ext. press. sensor P-
15. White: Output ext. press. sensor +
16. Brown: Ground (GND)
The three output relays are located on the measurement
board.
They can be individually configured to Normally Open (NO) or
to Normally Closed (NC) by physically moving the jumper on
each relay.
The LDO sensor measurement board is used as an example:
• Upper relay (J14) is set to NC
• Middle relay (J18) is set to NO
• Lower relay (J19) is shown with no jumper
Relay 2
J18
J4 J5
Relay 3
J19
J6