850°C Working standard PRTs

This new product combines our high temperature RTD probe technique with our special reference grade RTD elements. WSP850 series have similar accuracy and long-term stability of SSP850 secondary standard PRTs. This working standard PRT has upper limit up to 850°C and resistance drift at triple point of water less than 0.030°C after long-term test at 850°C for 500 hours. WSP850 PRT is designed for industrial environments to withstand mechanical shock.


Temperature range:

-250 -850°C
Resistance at 0°C:
25.5 Ω, 100 Ω
Temperature coefficient:
0.003850 or 0.003925 minimum
R0 typical drift < 0.03°C after
500 hours at 850°C
R0 typical drift < 0.005°C after
cycles from -196 to 850°C
Withstand 10 to 2,000 HZ at 20 G's


0.188" and 0.25" dia. x 12" L standard, custom sizes available

How to order


Model number


Tolerance at 0°C:

01 = ± 0.1% at 0°C


Probe length:

120 = 12.0 inches

Specify in 0.5" increment


lead wire termination:

G = Gold plated banana plugs

D = DIN connector

Sample part number:WSP85001120


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.