Minco Tel: (763) 571-3121
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Fax: (763) 571-0927
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www.minco.com
5
Troubleshooting
Symptom
Possible cause
Check
Action Required
No display on
the meter
Improper connection to
power supply or power
supply not turned on
Check wiring and power supply.
Correct wiring according to
diagram or Repair wires
Temperature sensor
does not match the
type which the
transmitter requires
Check for the correct temperature sensor type
Replace with correct
temperature sensor
Temperature of the
temperature sensor
may be higher or lower
than the Temptran
TM
transmitter's
temperature range
Verify the sensor’s operating temperature and that
this temperature is within the range of the
transmitter
Replace transmitter with a
range suitable for the
temperatures; recalibrate
meter to match new range
Improper wiring to the
meter supply terminals
Check wires supplying power to meter.
Repair wires
Improper wiring to the
temperature sensor
Check wires between sensor and transmitter
Repair wires
Meter display
is higher or
lower than
expected and
the reading is
steady
Temperature sensor
may be burned out
Examine the temperature sensor and wires for
damage.
Disconnect sensor from transmitter and ohm the
RTD; 100 ohm Platinum RTD’s are about 110 ohms
at room temperature and 1000 ohm Platinum RTD’s
are about 1100 ohms at room temperature.
Replace bad sensor
“
1
”
displayed
Valid or invalid loop
current signal causing
meter reading to
exceed maximum of
+1999
Check for open or shorted temperature sensor.
An open temperature sensor will not necessarily
cause an overrange display of “
1
”; for example,
when you have set the meter for a 0 to 500 °F
display, but a wiring problem causes the transmitter
to put out its overrange signal of 25 mA, the meter
will display about "656."
If transmitter is sending
proper 4-20mA signal, adjust
meter range.
If meter range is correct, fix
problem initiated by
temperature transmitter.
“
-1
“
displayed
Valid or invalid loop
current signal causing
meter reading to be
below minimum of
-1999
Figure out what should be displayed based on meter
setup.
When wiring to an RTD temperature sensor is
accidentally shorted it causes the transmitter to
produce a current between 3 and 4 mA. For
example, when you have set the meter for a 0 to
500 °F display, it may give a reading like "-25" for a
3 mA current, not a “
-1
.”
If transmitter is sending
proper 4-20mA signal, adjust
meter range.
If meter range is correct, fix
problem initiated by
temperature transmitter.
Note:
For further information on Minco temperature transmitters go to the following web link
http://www.minco.com/site/transmitter.php
