ThermoWorks 9141 HART SCIENTIFIC FIELD DRY-WELL TEMPERATURE CALIBRATORS - Manual (Page 49)

Unstable display Wait. Allow the instrument to stabilize for a few minutes.
Proportional band may be incorrect. Refer to the proportional band on the Re-
port of Calibration.
Electrical Noise. If the unit is being used in the field, take it to a different location
(calibration lab) to see if the display becomes stable. If the display is stable in the
new location, there may be electrical noise generated by equipment in the field in-
terfering with the control.
The display shows
an error Controller problem. The error messages signify the following problems with the
controller.
Err 1 - a RAM error
Err 2 - a NVRAM error
Err 3 - a Structure error
Err 4 - an ADC setup error
Err 5 - an ADC ready error
Err 6 - a defective control sensor, sensor is disconnected or shorted. Insure that
the sensor is connected.
Err 7 - a heater error, the fan will go on high speed.
Initialize the system by performing the Factory Reset Sequence described above. If
the unit repeats the error code, contact a Hart Scientific Authorized Service Center
for assistance.
Temperature cannot
be set above a cer-
tain point Incorrect High Limit parameter. The High Limit parameter may be set below
125°C. Check this value as described in Section 7.10, Operating Parameters.
AC voltage is pres-
ent on the insert or
block Improper Wiring. Use a wall plug tester to check the main power plug at the wall.
Power Cord. Check the cord for continuity on the ground prongs. If the resistance
is greater than one ohm, replace it.
Dielectric Test. Use an ohmmeter to check the continuity between the ground
prong on the PEM and the insert. If the resistance reading is greater then three
ohms, contact a Hart Scientific Authorized Service Center for assistance.
Power up Fuse. The unit is equipped with external operator accessible fuses. If a fuse blows,
it may be due to a power surge or failure of a component. Replace the fuse once.
DO NOT replace the fuse with one of a higher current rating. Always replace the
fuse with one of the same rating, voltage, and type. If the fuse blows a second time,
it is likely caused by failure of a component part. Contact a Hart Scientific Autho-
rized Service Center (Section 1.3) for assistance.
12.2 CE Comments
12.2.1 EMC Directive
Hart Scientific’s equipment has been tested to meet the European Electromag-
netic Compatibility Directive (EMC Directive, 89/336/EEC). The Declaration
of Conformity for your instrument lists the specific standards to which the unit
was tested.
9141 Dry-well Calibrator
User’s Guide
50