Interface Connectors; Receptacle Caps - Hach 900 MAX Instrument Manual

Section 1

1.3 Interface Connectors

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2
3
1. 12 V dc

1.3.1 Receptacle Caps

Page 18
Interface Connectors
Interface connectors are located on the left side of the controller housing. An
optional weather tight terminal box located on the back of the sampler
provides conduit termination for all input/output lines.
2. RS232
The sampler comes standard with two interface receptacles.
• 12 V dc (Power Input)
• Auxiliary (Multi-purpose input/output port)
• RS232 (Serial communications port)
• Thermal (Control port for heating and cooling system)
In addition, the sampler can be used with a wide variety of optional devices:
• Level and Flow Monitoring
(Sensors)
• pH/ORP
• Conductivity
• Dissolved Oxygen
• Temperature
Interface receptacles are covered with push-on receptacle caps. These caps
protect the connector pins from dirt and moisture and should be attached to
any receptacle not in use.
3. Auxiliary
Three additional analog inputs of
4–20 mA or -4.0 V dc to +4.0 V dc
• 4–20 mA Current Loop Output
• Modem
• Rain Gauge
8990int.fm