Operating Instructions

Operating menu and parameter description iTEMP TMT72
78 Endress+Hauser
Navigation Application → Current output → Failure mode
Description Use this function to select the signal on alarm level of the current output in the event of an
error.
Options • High alarm
• Low alarm
Factory setting Low alarm
Failure current
Navigation Application → Current output → Failure current
Prerequisite The High alarm option is enabled in the "Failure mode" parameter.
Description Use this function to set the value the current output adopts in an alarm condition.
User entry 21.5 to 23 mA
Factory setting 22.5
Adjustment of the analog output (4 and 20 mA current trimming)
Current trimming is used to compensate the analog output (D/A conversion). Here, the
output current of the transmitter must be adapted so that it suits the value expected at the
higher-level system.
Current trimming does not affect the digital HART
®
value. This can cause the
measured value shown on the locally installed display to differ marginally from the
value displayed in the higher-level system.
Procedure
1. Start
ß
2. Install an accurate ammeter (more accurate than the transmitter) in the current loop.
ß
3. Switch on current output simulation and set the simulation value to 4 mA.
ß
4. Measure the loop current with the ammeter and make a note of the value.
ß
5. Set the simulation value to 20 mA.
ß
6. Measure the loop current with the ammeter and make a note of the value.
ß
7. Enter the current values determined as adjustment values in the Current trimming 4 mA / 20 mA
parameters
ß
8. End