Author : Willwren

This can be done at ambient temperature, or by heating water or cooling water, immersing the sensor, and checking it. Use another thermometer to insure proper water temperature. Generally, if it reads correctly at a single known value, the sensor is good:

°C../..°F../..Ohms
100...212.....177
90....194.....241
80....176.....332
70....158.....467
60....140.....667
50....122.....973
45....113.....1188
40....104.....1459
35....95......1802
30....86......2238
25....77......2796
20....68......3520
15....59......4450
10....50......5670
5.....41......7280
0.....32......9420
-5....23......12300
-10...14......16180
-15....5......21450
-20...-4......28680
-30...-22.....52700
-40...-40.....100700

From this chart, it's easy to see that these sensors will read colder if the sensor is disconnected (higher resistance). Corrosion can have the same effect.

Author : willwren