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13 Troubleshooting
This section contains information on troubleshooting, CE Comments, and a
wiring diagram.
13.1 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 Hart Scientific Customer Ser
-
vice for assistance (1-801-763-1600). Be sure to have the model number and
serial number of your instrument available.
Problem Possible Causes and Solutions
Incorrect temperature
reading
Incorrect calibration parameters. Find the values for CT1, CT2, CT3, CE1, CE2,
and CE3 on the Report of Calibration that was shipped with the instrument (or
from subsequent calibrations of the instrument). Reprogram the parameters into
the Model 9150 memory (see Section 8.12, Calibration Parameters). Allow the
instrument to stabilize and verify the accuracy of the temperature reading.
Memory scrambled. The memory may be scrambled due to a power surge or
other aberration. Initialize the system by performing the Factory Reset
Sequence.
Factory Reset Sequence. Hold the SET and EXIT buttons down at the same
time while powering up the instrument. After the instrument displays
-init-
,re
-
lease the buttons. The display shows
9150
, and then displays the firmware
version. After performing the master reset sequence, all of the configuration pa
-
rameters are reset to their default values. Reprogram the calibration parameters
into the Model 9150 memory (see Section 8.12, Calibration Parameters) and
any other applicable configuration parameters. Allow the instrument to stabilize
and verify the accuracy of the temperature reading.
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).
Incorrect heater switch polarity. The PEM and the heater voltage switch may
not be set for the same voltage. Check both settings and correct as needed.
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13 Troubleshooting