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Chapter 3: Configuring the 2085-IT8-SC/IT-16-SC Using CCW
User’s Manual Pub. 0300322-01 Rev. A
3.6.7
Cold Junction Compensation Weighted Profile
There are two CJC weighted profiles available for estimating each channel’s
junction temperature. The default option,
Enable Distributed Profile
,
dynamically provides an estimate temperature varied by each channel‘s location
and height on the terminal block. The
Averaged CJC Temp
option provides an
average temperature from the CJ Sensor(s) to be applied to all the channels.
Index
CJC Weighted Profile
Note
0
Enable Distributed Profile
Default
1
Enable Averaged Profile
2
Disable CJ Compensation
3
Invalid
When the channel Cold Junction Compensation is enabled for Thermocouple
Type-B measurement, if the channel CJC reading is below 50 °C, due to the
impact from the thermal Electromotive Force (EMF), the cold junction
compensation will be skipped.
If Thermocouple Type C is used and channel CJC reading is below 0°C, where
the temperature is out of the thermocouple profile range, the cold junction
compensation will also be skipped.
If an invalid CJC Profile is entered in the configuration table, the module reports
a configuration error.
3.6.8
Input ADC Filter Frequencies Description
The modules use an input ADC digital filter that provides high-frequency noise
rejection for each input signal. The filter for each channel is programmable,
allowing you to select from four different filter frequencies.
Index
Filter (Hz)
Note
0
17
Default
1
4
2
62
3
470
The module will apply the ADC filter setting to each input channel in sequence
for data acquisition. The module scan rate on displaying data is tied to the
summation of each ADC filter settling time and each channel sampling time. The
2085-IT16-SC will have two sets of ADC measurement circuitries to process
input data in parallel.
3.6.9
Open Circuit Detection Description
The open circuit detection feature will alert you to a channel open circuit
condition by selecting the open circuit behavior option in the configuration table
to display a high limit, low limit, or zero data value for the appropriate channel(s)
in the input table. Open circuit detection may also be disabled for any or all
channels.
