New transmitter testo 6781 measures trace humidity in compressed air:
also in ISO 8573 Classes 1 and 2

The heart of the new dewpoint transmitter testo 6781 is sensor technology specially developed by Testo. The extraordinarily robust and durable sensor is extremely resistant to condensation formation and offers an accuracy of ±3.0°Ctd at a dewpoint of -90°Ctpd. With these extremely low, measurable dewpoints, the testo 6781 fulfils the two highest ISO quality classes regarding the requirements of, for example, modern semi-conductor production (Class 1: -70°Ctd) or granulate drying processes (Class 2: -40 °Ctd). As a comparison: the absolute humidity corresponds in Class 1 = 0.003 and in Class 2 = 0.12 g of water vapour per m3

Trace humidity transmitter

Air, compressed air and gases are used in all areas of industry. Humidity is normally undesirable because it can cause mechanical damage, corrosion or adhesion of the material, which can increase the operating costs or even impair the quality of the end product. The international standard ISO 8573 defines seven classes of compressed air quality based on moisture content, oil content and particle content. The main way of reaching and ensuring compliance with a quality class involves installing a suitable dryer. Pressure dewpoint transmitters/switches are used to monitor the dryer and its results.

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testo 6781 (Pressure dewpoint transmitter)

The new pressure dewpoint transmitter testo 6781 completes the product range for monitoring trace humidity in compressed air and enlarges the measurement range down to -90 °Ctd (see below graphic).

Overview of features and benefits:

Pressure dewpoint measurement in the ISO Classes 1 (<-70 °Ctd) and 2 (<-40 °Ctd)
Monitoring of adsorbtion dryers, granulate dryers and medical compressed air
Quality assurance for noble gas preparation

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testo 6781 (Pressure dewpoint transmitter)