Hanna Instruments HI 23 Series Instruction Manual page 8

1. RS 485 communications terminal (HI 23xy2 and HI 24xy2
models only)
2. Analog Output terminal (HI 23xy1 and HI 24xy1 models only)
3. Pt 100 Temperature Sensor terminal
4. Power supply output for external transmitter
5. 4-20 mA input from external transmitter
6. Main Power Supply
7. Alarm Terminal
8. Contact 1 - First Dosing Terminal
9. Contact 2 - Second Dosing Terminal
10. EC/TDS probe connector
11. Hold terminal
12. Timer terminal
Unplug the meter before any electrical connection.
The connections of terminals 1 to 5 are numbered from 1 to 15
Note
from top to bottom and the connections of terminals 11 and 12
are numbered from 16 to 19 from top to bottom.
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