9102S
User’s Guide
24
Calibrate a Single Probe
Insert the probe to be calibrated into the well of the Product. The probe should fit snugly into the
calibrator probe sleeve yet should not be so tight that it cannot be easily removed. Avoid any dirt or grit
that may cause the probe to jam into the sleeve. For best results, insert the probe to the full depth of
the well. Once the probe is inserted into the well, allow adequate stabilization time to allow the test
probe temperature to settle as described above. Once the probe has settled to the temperature of the
well, compare it to the displayed Product temperature. The displayed temperature should be stable to
within ±0.05 °C for best results.
W
Caution
Never allow foreign material into the wells of the block. Fluids and other materials can
damage the Product causing binding and damage to your probe.
Dry-well Characteristics
There is a temperature gradient vertically in the test well. The heater has been applied to the block in
such a way as to compensate for nominal heat losses out of the top of the dry-well. However, actual
heat losses vary with temperature and the design of the thermometer probes inserted into the Product.
For best results, insert probe to full depth of well.
Stabilization and Accuracy
The stabilization time of the Product depends on the conditions and temperatures involved. Typically,
the test well stabilizes to ±0.05 °C within 7 minutes of reaching the set-point temperature as indicated
by the display. Maximum stability is achieved 10 to 20 minutes after reaching the set temperature.
Depending on the magnitude of the disturbance and the required accuracy, inserting a cold probe into
a warm well requires another stabilization period. For example, inserting a 0.25 inch diameter room
temperature probe into a sleeve at 120 °C takes 7 minutes to be within ±0.05 °C of its settled point and
might take 15 minutes to achieve maximum stability.
Speeding up the calibration process can be accomplished by knowing how soon to make the
measurement. Fluke Calibration recommends that typical measurements be made at the desired
temperatures with the desired test probes to establish these times.
