Hach 900 MAX 用户手册

8990int.fm

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:

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.

12 V dc

RS232

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