Specifications

19
temperature measurement products
0.25
APPROX
2.00
APPROX
18.0”72.0”
1.50
REF
STRAIN RELIEF
0.50±0.01
0.250 ±0.005
0.25
APPROX
2.00
APPROX
12.0”72.0”
1.50
REF
STRAIN RELIEF
0.50±0.01
0.250 ±0.005
0.25
APPROX
2.00
APPROX
15.0”72.0”
1.50
REF
STRAIN RELIEF
0.50±0.01
0.250 ±0.005
425ºC Working Standard PRT
The model WSP425 PRT is a good choice for lower temperature range is required.
The sheath is of stainless steel construction with a strain free wire wound .3924 alpha sensing
element.
The WSP425 PRT can be used as a working standard in calibration baths, furnaces, fluidized
baths, dry block calibrators or for any other temperature calibration work.
Combine it with our model Tecal Accu-Temp RTD indicator for a system with high overall
accuracy. The WSP425 PRT includes a NIST traceable ITS-90 calibration with coefficients and R vs
T table.
Technical Specification
Resistance at 0° C: 100 ohms
Temperature range: -200 to 425°C
Calibrated temperature range: -50 to 425°C
Temperature coefficient: 0.003924 Ω /Ω /° C minimum
Stability: Meets IEC stability specifications after 250 hours exposure
to extremes of temperature range. Typical drift is less than
0.05°C (0.02Ω) at 0°C.
Repeatability: Meets IEC requirements. Typical shift less than 0.05°C
(0.02Ω) at 0°C after ten cycles over range.
Dimensions: 0.25” dia. x 12” L , custom sizes available
Tolerance at 0° C: ± 0.06%, IEC DIN class A
Lead wires: 4 wire PTFE insulated, stranded 22 AGW copper x 6” Long
Calibration
Each WSP350 PRT includes an ITS-90 NIST traceable calibration with a+, b+, a- and b-
coefficients and R vs T table. A padded carrying case is also included.
Calibrated uncertainty (K=2)
-50°C ±0.040°C
-20°C ±0.035°C
0°C ±0.030°C
100°C ±0.035°C
350°C ±0.050°C
(Calibrations down to -196°C available upon request.)
Accessories
FWSP350I 425°C Working Std 1/4” PRT