Purge controller for desiccant dryers
Your existing heatless dryer can stop wasting most of its purge air without being replaced. The AIRS purge controller is a retrofit PLC + HMI panel that takes over the dryer's two inlet valves and two purge blow-off valves and runs the regeneration to match the load, instead of on a fixed timer.
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Why fixed-cycle dryers waste air
A standard heatless dryer purges 15–20% of its rated flow every cycle, whether your plant is drawing full load or half load. At part load, or in dry weather, most of that purge is not needed. At a Gujarat chemical plant we measured 18.5% purge on conventional heatless dryers.
What the controller does
- Controls 4 valves: 2 inlet valves (one per tower) and 2 purge blow-off valves
- Runs regeneration to the dryer's real need rather than a fixed clock
- HMI shows cycle status, valve states, alarms and running hours
- Fits most twin-tower heatless dryers, whichever brand built them
What you can expect
Savings depend on how far below full load your dryer runs. Our Energy Saving Assessment measures your actual purge and gives you a figure in rupees before you decide.
| Example: 37 Nm³/min dryer, 8,400 h/yr, ₹10.3/kWh | Purge | Cost of purge per year |
|---|---|---|
| Fixed-cycle heatless (measured on site) | 18.5% | about ₹35.5 lakh |
| Purge cut to 8% | 8% | about ₹15.4 lakh |
| Saving | about ₹20 lakh a year |
Basis: 0.10 kWh per Nm³ of compressed air. Your numbers will differ; we measure them.
Questions buyers ask
Will my dew point suffer?
The controller is set up and proven against your required dew point during commissioning; we log outlet PDP before and after.
Which dryers does it fit?
Twin-tower heatless (pressure swing) dryers with separate inlet and purge valves. Send us a photo of the valve block and the nameplate.
How long does installation take?
Typically one shutdown shift for wiring and commissioning, depending on site access.
Is it a replacement for the dryer's own controller?
It takes over valve sequencing; the dryer's vessels, valves and desiccant stay.
Where do you work?
Across Gujarat and India, from our Ahmedabad office.
Call or WhatsApp +91 84888 42227 or email support@airs.net.in.