TEMPERATURE PROBE TEST (SG4D/SG6D)
Disconnect the electrical power to the machine and follow lockout / tagout procedures.
The temperature probe used in conjunction with the Solid State Temperature controller is an RTD (resistance temperature detector) of the Thermistor type. As temperature increases the resistance value decreases.
Test Steps
1.Remove the right side panel as outlined under Cover and Panels in Removal and Replacement of Parts.
2.Place a shielded thermocouple in the geometric center of the oven cavity and determine the temperature in the oven cavity.
3.Remove the probe lead wires from the solid state temperature controller.
4.Test the probe with an ohmmeter.
A.If the measured resistance values are inside the given tolerance, then the probe is functioning properly.
B.If the measured resistance values are outside the given tolerance, then replace the probe and make sure wires are secured to the terminals of the temperature controller. Recheck the temperature by preforming step 2.
1)Check the oven for proper operation.
5.Reverse Procedure to install.
TEMP (°F) | OHMS* |
|
|
77 | 90,000 |
|
|
240 | 4,077 |
|
|
260 | 3,016 |
|
|
280 | 2,266 |
|
|
300 | 1,726 |
|
|
320 | 1,332 |
|
|
340 | 1,041 |
|
|
360 | 822 |
|
|
380 | 656 |
|
|
400 | 529 |
|
|
425 | 424 |
|
|
450 | 334 |
|
|
475 | 266 |
|
|
(*) Resistance in ohms ± 10%
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