Dew Point Temperature Measurement. Humidity Control in Adsorption Dryers

Adsorption dryers are traditionally used in cases where very dry compressed air with a dew point temperature below -40°C is required. Typically, adsorption dryers have two vessels filled with adsorbent.

While one vessel undergoes the drying process, during which moisture is absorbed by the adsorbent, the other vessel is regenerated using some amount of compressed air supplied from the first vessel.

Switching between vessels is usually controlled by a timer. The standard regeneration cycle is 10 minutes, of which 5 minutes are allocated for moisture absorption, 4 minutes for regeneration, and 1 minute for pressure increase. Traditionally, the amount of compressed air required for regeneration is 14-15% of the total amount of compressed air produced. When controlled by a timer with fixed time intervals that does not respond to compressed air flow, constant air regeneration leads to additional air consumption, thus making it inefficient.

The pressure dew point temperature sensor model FA 510 allows precise determination of the specific load status of the compressed air network even under rapidly changing operating conditions. The sensor measures the current pressure dew point temperature, enabling direct control of the dryer’s humidity. By setting the switching threshold limit to the dryer’s dew point temperature of -40°C, switching depends on the load, resulting in significant savings of compressed air for regeneration.

Controlling adsorption dryers by monitoring the dew point temperature makes them much more energy-efficient compared to timer-controlled dryers.

We recommend the following products:

FA 510/515 - Dew point sensor for adsorption dryers.

Measurement of residual moisture after adsorption/membrane dryers in the dew point temperature range from -80 to 20°C.

New: with Modbus-RTU interface.

Have questions or need consultation on selecting equipment for your production? Contact the specialists at «Izmerkon» — we will help find the optimal solution for your needs.