Qualified-installer test procedure for a SIT-6E pavement sensor connected to the PD Pro control.
This procedure comes from the SCA-DUAL / PD Pro manual. It requires a qualified installer, powered measurements, and supervision because the heaters can activate. Follow the manual’s electrical-safety precautions and keep clear of line-voltage connections.
If paving residue covers the sensing surface, clean it as instructed in the manual. Avoid metallic or coarse abrasives and detergents.
- Use a digital voltmeter set to a suitable DC-voltage range. With the negative lead on sensor black and positive on red, the expected supply is 23–28 VDC.
- Keep the negative lead on black and move positive to white. With no snow demand, expect 22–28 VDC and both SNOW and HEAT off.
- Place a 10-pound bag’s contents of crushed ice over the sensor. Allow enough time for it to cool below approximately 38°F (3.3°C); the manual allows more than 20 minutes and longer if the surface was initially hot.
- When the sensor detects cold and moisture, white-to-black voltage should fall below 2 VDC and both SNOW and HEAT should illuminate.
Record the readings. Once testing is complete, disconnect power before restoring connections and covers, then restore the intended hold-on setting. If results differ, contact WarmlyYours Technical Support; do not bypass the sensor as a repair.
Sources
- Manufacturer instructions (publication 3508), PDF pp. 13–15.