Operator`s manual

Troubleshooting and Maintenance 5
100 Operator’s Manual 41
Water Bath Temperature Probe Accuracy Test
The temperature probe can be tested using a high quality voltmeter
capable of at least four digit resolution and a known-temperature bath.
Both the voltmeter and the bath temperature must be traceable to a
known reference standard such as NIST.
1 Place the probe into a known-temperature water bath and allow
several minutes for the probe to equilibrate.
2 The resistance is measured by attaching the leads of the voltmeter to
the top and shank of the 1/4 inch phone plug.
3 Refer to the following table to find the resistance value of the probe
at the bath temperature. Temperatures between the values listed may
be interpolated.
4 Probes are interchangeable and manufactured with a tolerance of
± 0.2 °C. Probes found to be outside the tolerance of ± 0.2 °C should
be replaced.
Table 2 Probe Resistance Values
Temp.
Centigrade
Resistance
Ohms
Temp.
Centigrade
Resistance
Ohms
Temp.
Centigrade
Resistance
Ohms
-5.0 9530 24.0 2354 53.0 724.50
-4.0 9046 25.0 2252 54.0 697.90
-3.0 8586 26.0 2156 55.0 672.50
-2.0 8151 27.0 2064 56.0 648.10
-1.0 7741 28.0 1977 57.0 624.80
0.0 7355 29.0 1894 58.0 602.40
1.0 6989 30.0 1815 59.0 580.90
2.0 6644 31.0 1739 60.0 560.30
3.0 6319 32.0 1667 61.0 540.50
4.0 6011 33.0 1599 62.0 521.50
5.0 5719 34.0 1533 63.0 503.30
6.0 5444 35.0 1471 64.0 485.80