Pyromation Series 642 - Manual (Page 31)

Series 642 Trouble-shooting
Pyromation, Inc. 31
8.3.3 Application errors for TC connection
8.4 Return
To reuse later or in case of repair, the device must be packed in protective packaging, preferably the
original packaging. Repairs must only be carried out by your supplier's service organisation or
specially trained personnel.
Enclose a note describing the fault and the application when sending the unit in for repair.
Error pattern Cause Action/cure
Measured value is incorrect/
inaccurate Orientation of the sensor is incorrect Install sensor properly
Heat conducted by sensor Observe face-to-face length of the sensor
Faulty device programming (number of
wires) Change SENSOR CONNECTION device
function
Faulty device programming (scaling) Change scaling
Incorrect RTD configured Change SENSOR TYPE device function
Sensor connection (2-wire) Check sensor connection
Line resistance of sensor (2-wire) was not
compensated Compensate line resistance
Offset incorrectly configured Check offset
Error pattern Cause Action/cure
Error current
(
≤ 3.6 mA or ≥ 21 mA)
Sensor connected incorrectly Connect sensor in accordance with
terminal plan (polarity)
Sensor defective Check sensor
Programming Incorrect sensor type configured in the
SENSOR TYPE device function; set correct
thermocouple
Device defective Replace device
Error pattern Cause Action/cure
Measured value is incorrect/
inaccurate Orientation of the sensor is incorrect Install sensor properly
Heat conducted by sensor Observe face-to-face length of the sensor
Faulty device programming (scaling) Change scaling
Wrong thermocouple type (TC) configured Change SENSOR TYPE device function
Incorrect comparison measurement point
configured See Section "Description of device
functions"
Offset incorrectly configured Check offset
Interference through thermo-wire welded
in thermowell (interference voltage
coupled in) Use sensor that does not have a weld-on
thermo-wire