660°C Working standard PRTs

Model WSP660 PRTs use our special wire wound RTD elements, assembled into Inconel probes. The WSP660 series has similar accuracy and long-term stability as our SSP670 secondary standard PRTs. They can be used for calibration furnaces, sand bath and other calibration work. Available in standard models and custom design.


Resistance at 0°C:
100 Ω or custom design
Temperature range:
-250 - 660°C
Temperature coefficient:
0.003850 or 0.003925 minimum
R0 typical drift < 0.02°C after
500 hours at 660°C
Thermal shock:
R0 typical drift < 0.005°C after
100 times from 25 to 660°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: WSP660A120N4L36


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.