Hach 900 MAX - Manual (Page 20)

Page 18
Interface Connectors
8990int.fm
Section 1
1.3 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.
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:
1.3.1 Receptacle Caps
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.
1. 12 V dc 2. RS232 3. Auxiliary
2
3
1
• Level and Flow Monitoring
(Sensors) Three additional analog inputs of
4–20 mA or -4.0 V dc to +4.0 V dc
• pH/ORP • 4–20 mA Current Loop Output
• Conductivity • Modem
• Dissolved Oxygen • Rain Gauge
• Temperature