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7
2560/2567 SPRT Module
This section explains the features and operation of the optional 2560/2567
SPRT Module.
7.1
Description
The 2560/2567 SPRT Module is an add-on module that allows the 1560 to
measure temperature with SPRT, PRT, and RTD sensors. These modules are ca-
pable of measuring temperature with very high accuracy. The Model 2560 ac-
cepts two or four-wire sensors with nominal resistance of 25Ω or 100Ω, while
the 2567 accepts two or four-wire sensors with nominal resistance of 500Ω or
1000Ω. The modules use 1 mA excitation current to minimize sensor self-heat-
ing. The excitation current alternates polarity to minimize the effects of thermo-
electric offsets. Two sensors can be connected to the 2560/2567 simultaneously
and measured alternately.
7.2
Specifications
Resistance range
Resistance accuracy, one-year
Resistance accuracy, short-term
Temperature accuracy (typical, not includ-
ing sensor uncertainty)
–100°C
0°C
100°C
200°C
300°C
400°C
500°C
600°C
Temperature coefficient
Excitation current
Maximum lead resistance
Sample time
Number of channels
Recommended operating temperature
range
1
Absolute operating temperature range
2560
0 to 400 Ω
1
0 to 25Ω: 0.0005Ω
25 to 400Ω: 20 ppm of
reading
1, 2
0 to 25Ω: 0.00025Ω
25 to 400Ω: 10 ppm of
reading
1
±0.003°C
±0.005°C
±0.007°C
±0.010°C
±0.012°C
±0.014°C
±0.017°C
±0.020°C
1
0.5 ppm/°C
7 2560/2567 SPRT Module
2567
0 to 4 KΩ
0 to 250Ω: 0.00625Ω
250 to 4KΩ: 25 ppm of
reading
0 to 250Ω: 0.00375Ω
250 to 4KΩ: 15 ppm of
reading
±0.004°C
±0.006°C
±0.009°C
±0.012°C
±0.015°C
±0.018°C
±0.021°C
±0.025°C
2.5 ppm/°C
1.0, 1.4mA; 1 Hz
100Ω
2 seconds
2
18 to 28°C (64 to 82°F)
5 to 35°C (40 to 95°F)
Description
113
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