How to test the 15 PPM monitor sensor?

1. Supply the calibration liquid into the 15 ppm monitor sensor. The monitor should display the correct value approximately equal to the concentration of contaminants in the calibration liquid.
2. Supply clean water into the sensor. The monitor should display 0.

If you need to test Oily Water Separator sensing probes, which detect the oil film on the water, dismantle and immerse them in the bucket with oil film above the water.