Hach 51 Series User Manual page 9

Instrument connections
Figure 1 Connections - panel (left); wall/pipe (right)
1 Power cable
2 Ethernet cable gland
3 USB-A host connector
4 USB-B 4-pin connector
5 Input/Output 1 cable gland
Connection to mains power supply
Power supply connection (low voltage instruments)
For low voltage instruments (10-30 VDC), connection to the mains power supply is with a 8-pin
BINDER connector (supplied).
Note: The connectors are grooved to avoid an incorrect fitting to the instrument.
Connect the power cable to the connector as follows:
Figure 2 BINDER connector
Power supply connection (high voltage instruments)
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
6 K-M1100 LDO Sensor connection (2x)
7 External pressure sensor connection
8 Input/Output 2 cable gland
9 Keylock (wall/pipe mount only)
Pin Connections:
1. Power 10-30 VDC
2. Ground
3. Ground
4. Ground
5. Not used
6. Power 10-30 VDC
7. Power 10-30 VDC
8. Earth
D A N G E R
Figure 3 Wiring side view
English 9