Hach-Lange ORBISPHERE Model 51x User Manual - Manual (Page 40)

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Installation
3.8.4 Measurement board
The different measurement boards for the EC and TC sensors are illustrated in Figure 17 and
Figure 18 below. The type of board is easily identified by the color of the J8 connector. For EC
boards this connector is colored orange, and for TC boards it is colored black.
Note: The colors indicated are the wire colors in the sensor cable.
NOTICE
It is extremely important that sensors are connected to the correct measurement board.
Connecting a TC sensor to an EC measurement board (and vice versa) will cause irreparable
damage to the measurement board.
Figure 17 EC Measurement board
Figure 18 TC Measurement board
Figure 19 Connector J7 Figure 20 Connector J8
Connector J7 (inputs & outputs)
Measurement alarms relays
1. Common
2. Output relay 1
3. Output relay 2
4. Output relay 3
Note: Relays N.O. or N.C. depends on the jumper
position on the relays (see Measurement alarm
relays on page 39 ).
Analog current (or voltage) outputs
5. GND
6. Output 1
7. Output 2
8. Output 3
Digital inputs
9. EC sensor: Not used
TC sensor: Hold input (short circuit to pin
12)
10. Not used
11. Not used