tekmar 095 Snow Sensor User Manual

Page 5

095_D - 05/13

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A Watts Water Technologies Company

Testing and Troubleshooting

If the Snow Melt Control shows an error message describing a sensor failure,
perform the following test procedure:

The 4 conductor wires at the sensor should be disconnected (unplug wiring
terminal plug).
Use a good quality electrical testing meter with an ohm scale range of 0 to
2,000,000 Ohms.

Using the ohmmeter and standard testing practices, measure the resistance
between:
1. The yellow (YEL) and black (BLK) wiring terminals to measure a 10 kΩ sensor

and use the Temperature vs. Resistance Table to calculate the approximate
temperature reading. Measure the surface temperature of the 095 blue sensor
disk and compare versus the yellow to black temperature reading.

2. Measure the resistance between the blue (BLU) and black (BLK) wiring

terminals. When the sensor surface is clean and dry, the reading should be
2,000,000 Ohms. When the sensor surface is wet it should be between 10,000
and 300,000 Ohms.

3. Measure the resistance between the red (RED) and black (BLK) wiring terminals

This reading should be between 45 to 47 Ohms.

If resistance readings are outside of the normal operating range, the sensor
has failed. The blue sensor disk can be replaced with the part number M3065
“Replacement Kit for Snow Sensor 095”.

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Maintenance

The sensor is installed in a harsh environment. Accumulation of dirt on the surface
of the sensor may affect snow detection. The sensor should be checked on a
periodic basis and, when necessary, cleaned.
1. Remove the outer ring by pulling up on the three catches.
2. A cloth with warm soapy water can be used to clean any dirt.
3. Rinse with water.
4. Align the three notches of the outer ring with the sensor body and push down

until each of the three corners have snapped on tight.

Step 8 - Assembly

1. Align the blue sensor disk tekmar logo with the highest point of the sensor

enclosure body. The blue sensor disk has a notch that ensures the sensor is
installed in the correct position.

2. Insert the three screws into the holes and screw them until tight. Do not over

tighten.

3. Align the three notches of the outer ring with the sensor body and push down

until each of the three corners have snapped on tight.