iTEMP TMT82 Operating menu and parameter description
Endress+Hauser 105
Description Use this function to assign a measured variable to the primary HART value (PV).
Options • Sensor 1 (measured value)
• Sensor 2 (measured value)
• Device temperature
• Average of the two measured values: 0.5 x (SV1+SV2)
• Difference between sensor 1 and sensor 2: SV1-SV2
• Sensor 1 (backup sensor 2): If sensor 1 fails, the value of sensor 2 automatically becomes
the primary HART
®
value (PV): sensor 1 (OR sensor 2)
• Sensor switching: If the value exceeds the configured threshold value T for sensor 1, the
measured value of sensor 2 becomes the primary HART
®
value (PV). The system
switches back to sensor 1 if the measured value of sensor 1 is at least 2 K below T:
sensor 1 (sensor 2, if sensor 1 > T)
• Average: 0.5 x (SV1+SV2) with backup (measured value of sensor 1 or sensor 2 in the
event of a sensor error in the other sensor)
The threshold value can be set with the Sensor switching limit value parameter.
With temperature-dependent switching, it is possible to combine 2 sensors that offer
advantages in different temperature ranges.
Factory setting Sensor 1
PV
Navigation Expert → Communication → HART output→ PV
Description Use this function to display the primary HART value
Assign SV
Navigation Expert → Communication → HART output → Assign SV
Description Use this function to assign a measured variable to the secondary HART value (SV).
Options See Assign current output (PV) parameter, → 104
Factory setting Device temperature
SV
Navigation Expert → Communication → HART output→ SV
Description Use this function to display the secondary HART value
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