User manual

Publication 1738-SG001B-EN-P

ArmorPoint I/O

CCoolldd--JJuunnccttiioonn CCoommppeennssaattiioonn ((11773388--IITT22IIMM1122 OOnnllyy))

Entering an estimated temperature is the least accurate way for cold-junction

compensation.

An open cold-junction compensator sets the input point to the maximum temperature

value for the selected input type, setting an alarm. Once the alarm is issued, it remains

active as long as the input signal is faulted (above maximum).

CCoolldd--JJuunnccttiioonn EEnnaabbllee ((11773388--IITT22IIMM1122 OOnnllyy))

Set this bit to enable or disable the cold-junction linearization. If enabled, the proper cold-

junction compensation value will be applied to the selected thermocouple. If disabled, the

data (cold-junction temperature) will still be available but not applied to the input. A cold-

junction value can be added using the cold-junction offset parameter.

NNooiissee FFiilltteerriinngg ((11773388--

IIRR22MM1122 OOnnllyy))

You can select the type and amount of noise filtering on each individual channel:

y notch filter of analog to digital converter

y first-order, low-pass digital filter

Choose the filter that provides you with the update and step response that most closely

matches your system requirements.

When using thermocouples, cold-junction compensation is required at the termination of

the thermocouple wire. Cold-junction can be accomplished in two ways:

y enter an estimated temperature

y an M12 terminal chamber with built-in CJC

To use the M12 terminal chamber, order 871A-TS4CJC-DM (straight) or 871A-TR4CJC-DM

(right-angle)