ThermoWorks 9141 HART SCIENTIFIC FIELD DRY-WELL TEMPERATURE CALIBRATORS - Manual (Page 48)

12 Troubleshooting
This section contains information on troubleshooting, CE Comments, and a
wiring diagram.
12.1 Troubleshooting Problems, Possible Causes,
and Solutions
In the event that the instrument appears to function abnormally, this section
may help to find and solve the problem. Several possible problem conditions
are described along with likely causes and solutions. If a problem arises, please
read this section carefully and attempt to understand and solve the problem. If
the problem cannot otherwise be solved, contact a Hart Scientific Authorized
Service Center (see Section 1.3) for assistance. Be sure to have the instru-
ment’s model number, serial number, voltage, and problem description
available.
Problem Possible Causes and Solutions
Incorrect tempera-
ture reading Incorrect R0, ALPHA, DELTA, or BETA parameters. Find the value for R0, AL-
PHA, DELTA, and BETA on the Report of Calibration. Reprogram the parameters
into the instrument (see Section 7.9, Calibration Parameters). Allow the instrument
to stabilize and verify the accuracy of the temperature reading.
Controller locked up. The controller may have locked up due to a power surge or
other aberration. Initialize the system by performing the Factory Reset Sequence.
Factory Reset Sequence. Hold “SET” and “EXIT” down at the same time while
turning on the instrument. The instrument displays shows ‘-init-‘, the model number,
and the firmware version (release “SET” and “EXIT”). Each of the controller param-
eters and calibration constants must be reprogrammed. The values can be found
on the Report of Calibration.
The instrument
heats or cools too
quickly or too slowly Incorrect scan and scan rate settings. The scan and scan rate settings may be
set to unwanted values. Check the Scan and Scan Rate settings. The scan may be
off (if the unit seems to be responding too quickly). The scan may be on with the
Scan Rate set low (if unit seems to be responding too slowly).
Improper line voltage. Verify that the voltage reading in the bottom of the unit
matches the source voltage.
Improper switch setting. Check the 115 VAC/230 VAC switch on the PEM (power
entry module). Make sure this switch is set to the correct type of input voltage.
Check the 115 VAC/230 VAC heater switch. Make sure this switch is set to the cor-
rect type of input voltage.
An “o” is displayed
at the left of the
display External Switch open. The external switch is open causing the displayed tempera-
ture to be frozen and keeping the set-point from scanning. Turn the Switch Test off
by pressing the “DOWN” button on the front panel.
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12 Troubleshooting