Description

DESCRIPTION

This new microprocessor-based family based DEW point Transmitter, & Handheld is designed for a wide variety of compressed air dryers, plastic dryers, additive manufacturing and other OEM  applications. The AIDP18 H is use for Hand held Dew point Measurement. The AIDP18T is  Dew Point Transmitter with Output Of 4`20mA & RS 485 [Option].

Why is knowledge of dew point in compressed air important?

The importance of dew point temperature in compressed air depends on the intended use of the air. In many cases dew point is not critical (portable compressors for pneumatic tools, gas station tire filling systems, etc.). In some cases, dew point is important only because the pipes that carry the air are exposed to freezing temperatures, where a high dew point could result in freezing and blockage of the pipes. In many modern factories, compressed air is used to operate a variety of equipment, some of which may malfunction if condensation forms on internal parts. Certain water sensitive processes (e.g. paint spraying) that require compressed air may have specific dryness specifications. Finally, medical and pharmaceutical processes may treat water vapor and other gases as contaminants, requiring a very high level of purity.

What is the typical range of dew point temperatures to be found in compressed air?

Dew point temperatures in compressed air range from ambient down to -80 °C (-112 °F), sometimes lower in special cases. Compressor systems without air drying capability tend to produce compressed air that is saturated at ambient temperature. Systems with refrigerant dryers pass the compressed air through some sort of cooled heat exchanger, causing water to condense out of the air stream. These systems typically produce air with a dew point no lower than 5 °C (23 °F). Desiccant drying systems absorb water vapor from the air stream and can produce  air with a dew point of -40 °C (-40 °F) and drier if required.

What are the standards for the quality of compressed air?

ISO8573.1 is an international standard that specifies the quality of compressed air. The standard defines limits for three categories of air quality:

* Maximum particle size for any remaining particles
* Maximum allowable dew point temperature
* Maximum remaining oil content
Each category is given a quality class number between 1 and 6 according to the reference values shown in the
table below. As an example, a system that conforms to ISO8573.1 and is rated for class 1.1.1 will provide air with a
dew point no higher than -70 °C (-94 °F). All remaining particles in the air will be 0.1 um or smaller, and the maximum
oil content will be 0.01 mg/m3. There are other standards for compressed air quality, such as ANSI/ISA- 7.0.01-1996
for instrument air.