Instrumentation
Water content is a critical aspect of many industrial processes, so the ability to accurately monitor relative humidity is crucial. Sean Ottewell reports.
Der Wassergehalt ist ein kritischer Aspekt bei vielen industriellen Prozessen, und daher ist es von entscheidender Bedeutung, die relative Feuchte genau kontrollieren zu können. Sean Ottewell berichtet.
La teneur en eau est un aspect essentiel pour de nombreux procédés industriels, par conséquent il est crucial de contrôler de manière rigoureuse l’humidité Selon Sean Ottewell.
Accurately monitoring relative humidity
T
he Vaisala DMT132 HUMICAP dew point transmitter is an affordable new dew point transmitter for verification of the refrigerant dryer functionality. It is especially well suited for OEM dryer
manufacturers. The DMT132 offers accuracy of ±1°C in
the typical operating range of refrigerant dryers, is quick and easy to install directly into dryers or compressed air lines, and has power requirements as low as 10v DC. The DMT132 incorporates the proven Vaisala HUMICAP sensor, which is resistant to compressor oil and most other chemicals, thereby providing excellent long-term stability (Fig.1). Vaisala offers a wide range of reliable, easy-
to-use dew point meters for compressed air applications, from configurable transmitters with graphical displays to miniature OEM meters. Its product family includes equipment for the full range of environmental conditions, from very dry to more humid. Spot-checking is easy with the compatible hand-helds, either the Vaisala DRYCAP hand-held dewpoint meter DM70, or Vaisala HUMICAP hand-held humidity and temperature meter HM70. Direct refrigerator dew point measurement
provides accurate information about dryer functionality and is more reliable than the traditional method of measuring refrigerator
temperature only. Knowledge of the real dew point ensures high quality compressed air at all times and enables customers to optimise dryer capacity. As well as helping to prevent investment in redundant dryer capacity, this also helps to avoid unnecessary maintenance and costly malfunctions. Other new products from Vaisala include
the HUMICAP humidity and temperature transmitters HMT120 and HMT130, both of which are designed for humidity and temperature monitoring in cleanrooms. They are also suitable for demanding HVAC applications. In another development, the company recently
showcased its integrated Vaisala Veriteq continuous monitoring system (CMS) at Interphex 2011. The world’s largest pharmaceutical and
biotechnology companies rely on the Vaisala Veriteq CMS to monitor temperature, humidity, differential pressure and other critical parameters in their highly demanding controlled and regulated environments. The Vaisala Veriteq CMS ensures fail-safe, gap-free data recording to enable full compliance with the strictest FDA requirements. Vaisala Veriteq validation systems are powerful,
easy-to-use alternatives to thermocouple-based equipment and bulky data acquisition systems. They are designed for the most critical validation and mapping applications in controlled environments. Vaisala also chose Interphex to provide updates
Fig. 1. The DMT132 incorporates the proven Vaisala HUMICAP sensor, which is resistant to compressor oil and most other chemicals.
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