300°C Working standard PRTs

Model WSP300 PRTs feature wire wound RTD elements assembled into stainless steel or Inconel probes. The WSP300 series has excellent accuracy and long-term stability. They can be used as working standard in calibrating other temperature sensors. Available in standard models and custom design.


Resistance at 0°C:
100 Ω or custom design
Temperature range:
-200 - 300°C
Temperature coefficient:
0.003850 or 0.003925 minimum
R0 typical drift < 0.001°C after
1,000 hours at 300°C
Thermal shock:
R0 typical drift < 0.001°C after
100 times from 25 to 300°C
0.188" and 0.25" dia. x 12" L standard, custom sizes available

How to order


Model number


Tolerance at 0°C:

A = ± 0.06%, IEC DIN class A

B = ± 0.12%, IEC DIN class B


Probe length:

120 = 12.0 inches

Specify in 0.5" increment


Number of leads:

N4 = 4 leads


Lead wire length in inches

L36 = 36 inches

Sample part number: WSP300A120N4L36


ASP is constantly developing new products. Please click to learn more.

Specialty of product

Excellent long term stability and wide temperature range is the specialty of ASP RTDs and PRTs.

How to Order

ASP accepts major credit cards order.