Replace old ammonia sensor

The older Healthy Climate Monitor contains an electro-chemical ammonia (NH3) sensor that can become saturated when used for more than 48 hours at a concentration higher than 25ppm. We replace this sensor at every service in your subscription if it has become saturated.

You can tell if the sensor has become saturated, if the graph of NH3 readings goes from a value above 25ppm to below 5ppm all at once within a day. If you see this happening, you can stop the saturation by immediately hanging your Healthy Climate Monitor outdoors for 24 hours with the power connected. If the ammonia reading never goes above 5ppm after that, it should be replaced.

Replacing the ammonia sensor

If you purchased your Healthy Climate Monitor after 17 March 2021, you can easily replace the ammonia sensor yourself using the tool below. 

Switch off the HCM by removing the plug from the socket. There is a special screw cap in the bottom of the HCM housing: unscrew it using a 20ct coin. Then you can pull out the sensor and insert a new ammonia sensor. Watch the video below on how to do this.

If you purchased your Healthy Climate Monitor before 17 March 2021, you should have the ammonia sensor replaced by Healthy Climate Solutions during a service.