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8
2561 HTPRT Module
This section explains the features and operation of the optional 2561 HTPRT
Module.
8.1
Description
The 2561 HTPRT Module is an add-on module that allows the 1560 to measure
temperature with high-temperature PRT sensors. It is capable of measuring
high-temperature with very high accuracy. It accepts four-wire sensors with
nominal resistances of 0.25Ω to 5Ω. It uses 3 or 5 mA excitation current to
minimize sensor self-heating. The excitation current alternates polarity to mini-
mize the effects of thermoelectric offsets. Two sensors can be connected to the
2561 simultaneously and measured alternately.
8.2
Specifications
Resistance range
Resistance accuracy, one-year
0 to 2Ω
2 to 25Ω
Resistance accuracy, short-term
0 to 2Ω
2 to 25Ω
Temperature accuracy (typical, not including sensor uncer-
tainty)
1
0°C
100°C
400°C
800°C
1200°C
Temperature coefficient
Excitation current
Maximum lead resistance
Sample time
Number of channels
Recommended operating temperature range
Absolute operating temperature range
Weight
1
The accuracy specifications apply within the recommended operating temperature range. Accuracy limits
are increased by a factor of the temperature coefficient outside this range.
1
1, 2
1
1
8 2561 HTPRT Module
Description
0 to 25 Ω
0.0001Ω
50 ppm of reading
0.00008Ω
40 ppm of reading
±0.013°C
±0.018°C
±0.035°C
±0.060°C
±0.090°C
2.5 ppm/°C
3, 5mA; 1 Hz
10Ω
2 seconds
2
18 to 28°C (64 to 82°F)
5 to 35°C (40 to 95°F)
2 lbs.
119
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