22 Smart Temperature Transmitter STT250 – Operator Manual
5.2.2 Troubleshooting with HART communicator
SYMPTOM HART
communicator
MESSAGE/
DISPLAY
POSSIBLE
CAUSE
CURE
Incorrect
output signal
with
simulating
device
None The most common
error is changing
the sensor wiring
after probe type
selection or after
power-up.
Check the appropriate
sensor wiring and power
cycle when it is correct.
Remember when changing
configuration to first connect
sensor wiring correctly, then
change configuration.
When
changing
LRV or URV
"VALUES TOO
HIGH OR TOO
LOW"
If the LRV is
changed, the URV
tries to change by
the same amount to
maintain the same
SPAN. If this new
URV exceeds the
URL then this
message appears.
Make sure that:
LRV >= LRL
and that
URV <=URL
Status is set
to
"USER
CORR
ACTIVE"
"USER CORR
ACTIVE"
Transmitter has
been trimmed for
particular sensor
range. This can be
done by keying in
LRV/URV,
with exact LRV and
URV input values to
enable improved
accuracy over the
specifications.
When performing a Reset
Correct command or a
sensor type change, the
transmitter will lose this
sensor correction and fall
back to the original factory
calibration.
Remember that successful communications with the STT250 result in many useful
pieces of data. With the initial I.D. response,the user can confirm that the:
1. Transmitter is powered
2. Line resistance is correct
3. Wires run to the correct unit. If not, the unit connected can be identified by the
tag number.
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