Cornelius 500-Series Service Manual download pdf (Page 25)

TD 18420

3. Cut the suspected sensor wire at least six inches

from the thermowell in which it is located.

4. Remove the sensor from the thermowell.

5. Carefully separate the wires and strip the insulation

off the end.

6. Pack a glass or container with ice and add some

water to make an ice water solution. Check the

temperature of the ice water with an accurate ther-

mometer. Ice water must be 32°F.

7. Insert the sensor into the ice water and soak for a

minimum of two minutes.

8. With a zerod ohmmeter, measure the resistance

across the two wires of the sensor lead. It should

read 2815 ohms  10% (281 ohms)on units built

before March 1994;  5% (140 ohms) on units built

from March 1994 and later.

2815

OHMMETER

LEADS

BATH 32_F

SENSOR

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Cornelius 500-Series Service Manual Page 25