Main Board - Hach ORBISPHERE 51 Série Manuel D'utilisation Simplifié

6. Secure the power cable by screwing the end plug (1) back in place.
7. The female connector can now be plugged directly into the instrument power connector. The two
connectors are grooved to avoid an incorrect fitting. Tighten the female connector to the
instrument power connector finger-tight.
4.6 Connections to electronic boards
Potential Instrument Damage. Delicate internal electronic components can be damaged by static
electricity, resulting in degraded performance or eventual failure.
Note: Any loose connection wires should be bundled tightly together with the use of nylon cable ties.
4.6.1 Sensor cable
An ORBISPHERE cable (10 wire shielded, Part N° 32505.mm) is needed to connect the sensor(s) to
the instrument. The instruments have a Lemo 10 socket on the back panel where the sensor cable
has to be connected.
4.6.2 Electronic boards connectors
Connectors P8 on the main board
to Measurement board
either side of the connector and pull it out securely. Perform all connections with these connectors
unplugged. Once finished, attach the connectors to the boards by pushing them firmly in place
(levers up).

4.6.3 Main board

Figure 4 Main board
Connector P8
The numbers listed below refer to the 13 available P8 connections (from left to right) in
1. RS-485 (signal A)
2. RS-485 (signal B)
3. PROFIBUS-DP (GND)
4. PROFIBUS-DP (+ 5 V)
5. PROFIBUS-DP (signal -)
6. PROFIBUS-DP (signal +)
7. PROFIBUS-DP (signal RTS)
12 English
N O T I C E
(Figure 4 on page 12) and J7 on the measurement board (refer
on page 13) are made of two parts. Push down carefully the black levers on
Figure 5 Connector P8
8. Not used
9. Not used
10. Not used
11. System alarm relay (N.O.)
12. System alarm relay (N.C.)
13. System alarm relay (Common)
Figure 5.