Measurement & air quality
Compressed air dew point analysis
Measurement of your compressed air pressure dew point in Québec: real dryer performance, ISO 8573-1 quality class and diagnosis of moisture in the lines.
Dew point analysis measures the real dryness of your compressed air — the temperature at which moisture starts to condense again. It is the direct indicator of your dryer’s performance and of the air quality delivered to your processes.
It is a distinct measurement service. It verifies a specific characteristic of the air — its moisture — where the air audit targets energy performance and leak detection targets losses. We measure the pressure dew point, at the network’s operating pressure: that is what tells you whether water will condense in your lines.
An off-target dew point explains water in the lines, corrosion, freezing of outdoor lines in winter and process defects (paint, food, instrumentation). The measurement is compared to the target your uses require, expressed as an ISO 8573-1 humidity class.
A refrigerated dryer tops out around +3 °C (ISO 8573-1 class 4); a negative dew point (−40 °C and below, classes 1 to 3) requires a desiccant dryer. Fouled, undersized or in too warm a room, a dryer can drift well above its target — only the measurement reveals it.
When to measure the dew point
- Water or condensate in the lines, tools or products
- Corrosion of the piping or pneumatic components
- Outdoor or unheated-room lines that freeze in winter
- Moisture-sensitive processes: paint, coating, food, instrumentation, laboratory
- Commissioning or verification of a dryer, new or existing
- Customer requirement or air-quality standard to demonstrate (ISO 8573-1)
- And more, depending on your uses
How we proceed
- Pressure dew point measurement at the relevant network points, under operating conditions
- Comparison to the target your uses require (ISO 8573-1 humidity class)
- Root-cause search if the air is off target: undersized, fouled, failed or bypassed dryer, ambient conditions
- Recommendation: adjustment, maintenance, addition or resizing of the air treatment
What you receive
- The measured dew point values, per point
- The corresponding ISO 8573-1 humidity class
- The verdict: compliant or not with your target
- A prioritized corrective recommendation
Frequently asked questions
What is the pressure dew point?
It is the temperature at which the water vapour in the compressed air starts to condense, measured at the network’s operating pressure. The lower it is, the drier the air. It is the value that tells you whether water will condense in your lines — not to be confused with the atmospheric dew point, always lower for the same air.
How is it different from an air audit or leak detection?
Dew point analysis measures moisture — the air’s quality and dryness. The compressed air audit measures the system’s energy performance. Leak detection targets losses. These are three distinct services that can be combined but answer different needs.
What dew point do I need?
It depends on your uses, expressed as an ISO 8573-1 humidity class: about +3 °C (class 4) suits indoor, heated areas; an outdoor or unheated line in Québec often requires a negative dew point (−40 °C and below, desiccant dryer) to avoid freezing. The measurement confirms the target is met.
Does production have to stop during the measurement?
No. The measurement is taken on a network in operation, at the operating pressure, without interrupting production.
Let’s talk about your compressed air system
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