Temperature transmitter iTEMP TMT82 Use in safety instrumented systems
Endress+Hauser 27
2. NOTICE
‣
If the display will remain attached to the transmitter for the rest of the
application, the setting of the DIP switches must be changed again after the test
sequence.
ON
OFF
1
2
4
8
16
32
64
HW
SW
ADDR ACTIVE
SIM
WRITE LOCK
DISPL. 180°
1 = off
2 = on
4 = off
8 = on
16 = off
32 = on
64 = off
SW = on
A0026451
4 Setting for the DIP switches on the plug-in display
Check both alarm states (High and Low alarm) by restarting the device by plugging in
a display unit and setting the DIP switches on the back to the appropriate position.
When the device is restarted the following start-up sequence appears on the
plug-in display:
A0026471
5 Device start-up sequence on the display
1 Start of sequence
2 Device restart
The start-up sequence on the display indicates whether the restart is being
performed.
The alarm states, High alarm (≥ 21.0 mA) and Low alarm (≤ 3.6 mA), are output
consecutively for longer than 4 s in each case.
94% of dangerous, undetected failures are detected using this test (proof test coverage,
PTC = 0.94). During the test sequence, the device's current output typically behaves as
illustrated in → 6, 28.
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