How To Test the Midmark Temperature Sensor

Service Tip: Residue can build up on the Temperature Sensor Probe causing inaccurate temperature readings. Clean the probe with an abrasive pad (dark color scotch-brite pad). Then try another cycle. If the autoclave still does not work properly, move on to the testing as follows

Temperature Sensor Test

Step 1: Disconnect temperature sensor harness from J12 on PC board.
Step 2: Place meter probes on red and white wires. [Set meter to 2K ohms Ω]

Acceptable Range is 1.07 to 1.1 ohms Ω

If reading is out of acceptable range...Replace the Temperature Sensor

If reading is within acceptable range...Perform Supply Voltage Test

Temperature Sensor Supply Voltage Test

First, locate the Test Points TP2 & TP4 on your PC Board. Set your meter to 20 VDC

Step 1: Place meter probes on test points:

Black probe: TP2
Red probe: TP4

Acceptable Range is 4.0 to 6.0 VDC

If reading is out of acceptable range...Replace main PC board.

If reading is within acceptable range...Main PC board is functioning properly