Siemens SITRANS T Series - Changing the Callendar-Van Dusen Coefficients; Assignment of Dynamic Variables; Operating Hours Counter

9.4.6.2 Changing the Callendar-Van Dusen coe󹪟cients
Procedure
1. Select a sensor with Callendar-Van Dusen coe󹪟cients for the "Input type" parameter.
2. Change the values for R0, A, B and C, or R0, Alpha, Beta and Delta.
3. Transfer the values to the device.
9.4.7 Assignment of dynamic variables
With the remote operation you can assign any device variable for the dynamic variables PV
selector, SV selector, TV selector and QV selector.
The device variable assigned to the PV selector controls the loop current.
Device variables: Input 1
Input 2
Input 1 CJC
Input 2 CJC
Average input 1 and input 2
Di󹪜erence input 1 - input 2
Di󹪜erence input 2 - input 1
Absolute di󹪜erence input 1 - input 2
Minimum input 1 or input 2
Maximum input 1 or input 2
Input 1 and input 2 as backup
Input 2 and input 1 as backup
Average input 1 and input 2 with both as backup
Minimum input 1 or input 2 with both as backup
Maximum input 1 or input 2 with both as backup
Electronics temperature
9.4.8 Operating hours counter
Operating hours counter for transmitter electronics
• Monitors the number of operating hours during which the transmitter remained in
continuous operation, depending on the ambient temperature.
• The operating hours history of the transmitter is recorded in 9 ambient temperature ranges.
• Starts with the 󹪝rst commissioning at the factory.
• Operating hours counter and temperature ranges cannot be reset or set by the user.
• The operating hours counter is only updated as long as the device is in measuring mode. The
operating hours counter is not updated in simulation mode.
Parameter assignment
9.4 Assigning parameters using remote operation
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
166 Operating Instructions, 05/2020, A5E41864807-AB