The new CHEMTROL PPM Sensor is a solid state sensor with a selective membrane that provides direct readings of Free Chlorine in water. CHEMTROL is introducing new PPM sensors for direct measurement of FREE CHLORINE in water in parts per million (ppm) or milligrams per liter (mg/l). Unlike other chlorine sensors on the market, these sensors are very precise and so reliable. They are easy to install and practically maintenance free. For best water management, it is recommended to use ORP control of chlorine oxidizing activity and PPM monitoring of free chlorine. Alternatively, PPM control can be used for control of the sanitizer and ORP control for a non-chlorine oxidize.

 

 

The following standard ranges are available - P/N PPM002 from 0.02 to 2 ppm, - P/N PPM010 from 0.1 to 10 ppm. Other sensors are available for measurements up to 200 ppm.

 

For best results in water management, it is recommended to use both ORP control of free chlorine and PPM monitoring of total and combined chlorine. Alternatively, PPM control can be used for control of the sanitizer and ORP control for an oxidizing agent, such as ozone.

 

To calibrate the sensor, use a DPD or OTO test kit for total chlorine. It is recommended to do the first calibration 2 hours after startup and to repeat it after 24 h. After that, check the calibration as required and generally every 3 to 4 weeks.

 

There is no special maintenance requirements except to make sure that the membrane remains clean and to replace the membrane and electrolyte when needed. In winter, remove the sensor to prevent freezing if applicable. Do not reuse the membrane once removed. Replace with new membrane and electrolyte. In order to prevent serious damage to the sensor, be careful not to touch the membrane or the electrodes. To facilitate shipment and storage of the sensor, it is not fitted with the electrolyte cap until ready for installation. The sensor cap must be filled with the electrolyte solution before usage and emptied during storage.