Input Configuration Tab - 1794-IRT8 and 1797-IRT8
Use this tab to configure the 1794-IRT8 or the 1797-IRT8 module. On this tab, you can select the channel you want to configure with the following information.
- Select a Sensor and Sensor Type
- Select the Sensor Mode
- Select the type of RTD loop resistance compensation
- Select the Input Filter Cutoff
- Select a module Data Format
- Select a fixed Reference Junction temperature to compensate thermocouple channels
Parameters
Sensor
Selects input channel mode for channel group 0-3 and 4-7. The values are as follows.
- Thermocouple
- RTD
The Sensor selected determines the Sensor Mode and Sensor Type. The default is Thermocouple.
Sensor Type
Selects type of sensor for channel group 0-3 and 4-7 and are based on the Sensor.
TIP:
When in RTD or Thermocouple mode, the module will default to °C if 5-15 are chosen. For modes 0-2, there is an implied decimal point to designate 0.1 (0.01 for Cu10 RTD mode) measurements.
For example: 3500 counts
®
350.0 °CIf the Sensor is Thermocouple the values are as follows.
mV, Type B, Type E, Type J, Type K, Type TXK/XK(L), Type N, Type R, Type S, and Type T.
The default value is mV.
If the Sensor is RTD the sensor types are as follows.
Resistance, 100 ohm Pt 385, 200 ohm Pt 385, 100 ohm Pt 3916, 200 ohm Pt 3916, 100 ohm Ni 618, 200 ohm Ni 618, 120 ohm Ni 672, and 10 ohm Cu 427.
The default value is Resistance.
Sensor Mode
Selects mode for channel group 0-3 and 4-7 and is based on the Sensor you choose.
If the Sensor is Thermocouple the values are as follows.
External Compensation, Internal Compensation, No Compensation and Differential Compensations.
The default value is External Compensation.
When Internal Compensation is selected, the channel button is marked with an asterisk (*)and a value can be assigned to the Reference Junction. When using External or Differential Compensations, the Reference Junction is disabled and cannot be used.
If the Sensor is RTD the values are as follows.
2-wire No Compensation, 2-wire With Loop Compensation, 3-wire, and 4-wire.
The default value is 2-wire No Compensation.
When RTD is selected, the Sensor Type and Sensor Mode automatically change to the default values of Resistance and 2-wire no compensation respectively. When 2-wire With Loop Compensation is selected for the Sensor Mode, the RTD Loop Compensation group box is activated and reflects the channel group you have selected.
Detect Faults on these Channels
This checkbox enables wire off fault detection for channels 0-3 and 4-7. The values are as follows.
Checked, or Unchecked.
The default value is Unchecked.
Input Filter Cutoff
This feature allows you to add additional roll off frequency for all channels. The values are as follows.
Hardware Filter Only, 25ms, 100ms, 250ms, 500ms, 1 s, 2 s, and 5 s.
The default value is Hardware Filter Only.
Data Format
This feature lets you to specify the module data format for all channels, which consists of a current range combined with an error tolerance range and a resolution. The values are as follows.
°C, °F, °K, -32767..32767, and 0..65535.
The default value is °C.
RTD Loop Compensation
Allows you to select the type of RTD loop resistance compensation for each channel. The static label of channel numbers reflects the setting of the channel button. The values are as follows.
Use Calibration Value, 5 ohms, 10 ohms, and 15 ohms.
The default value is Use Calibration Value.
Reference Junction
If the Sensor Mode of Internal Compensation has been selected, this sets a fixed reference junction temperature used to compensate all thermocouple channels. The values are as follows.
0°C, 20°C, 25°C, 30°C, 40°C, 50°C, 60°C, and 70°C.
The default value is 0°C.
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