Test Probe Calibration; Calibrating A Single Probe; Furnace Characteristics - Fluke 9150 User Manual

Portable furnace

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User manual (49 pages)

Table Of Contents

Table of Contents

For optimum accuracy and stability, allow the calibrator to warm up for 10

minutes after power-up and then allow adequate stabilization time after reaching

the set-point temperature. After completing operation of the calibrator, al- low the

well to cool by setting the temperature to 150°C or less for one-half hour before

switching the power off.

10.1 Calibrating a Single Probe

Insert the probe to be calibrated into the well of the furnace calibrator. 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. Best results are obtained with the probe inserted 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 de- scribed above. Once the

probe has settled to the temperature of the well, it may be compared to the

calibrator display temperature. The display temperature should be stable to

within 1°C degree for best results.

10.2 Furnace 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 furnace. However, actual heat losses will vary with design of the

thermometer probes inserted into the calibrator and the temperature. For best

results, insert probe to full depth of well.

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Never introduce any foreign material into the probe hole of the

insert. Fluids etc. can leak into the calibrator causing damage

to the calibrator or binding and damage to your probe.

Do not remove inserts and insulators at high temperatures.

Inserts and insulators are the same temperature as the display

temperature. Use extreme care when removing hot inserts and

insulators.

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