ST-AI-INS-08U Usage Tips

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SixTRAK Local I/O
Instrumentation Analog Inputs

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The instrumentation analog input module is ideal for one or more of the following applications:

¢	Thermocouple temperature measurements
¢	Volt or millivolt readings
¢	Floating (off ground) 4-20 mA readings
¢	Any combination of the above ranges
¢	For accuracy better than 0.1%
¢	For true differential performance (superior ground loop rejection)

Note: You must set the current shunt jumper inside the base (open the door) for each 4-20 mA channel.

Current Loop Inputs (4-20 mA channels)

A 100-ohm precision current shunt is present in the base of all analog input modules that read 4-20mA instrumentation loop signals. If a module is unplugged, current continues to flow in the loop.

The ST-AI-INS-08U module supports multiple input ranges and must only have this shunt across the input for each 4-20 mA input. Access the shunt selection jumper for each channel by opening the base access door (with the module removed).

Current shunts act as fuses if overloads occur (typically from shorted transmitters). These shunts are field replaceable. A spare shunt is stored inside the base access door.

Instrument loops may be protected from over current by using a ST-CL-20M-16H module.