Based on years of dedicated research and development and proprietary scientific breakthroughs, the HDT-LQ Series combines the COSA Xentaur Dew Point Transmitter HDT Series with the HTF™ aluminum oxide sensor.
The HDT Series dew point transmitters are designed as compact, simple and reliable instruments, which will continually monitor air dryer performance, compressed air quality and dry gas moisture, from ambient dewpoint levels to as low as -100°C.
Applications
The XDT Series transmitter electronics take full advantage of state of the art microprocessor technology and offer many advanced intelligent features. With optional dual alarms, analog and digital outputs, the XDT Series dew point transmitters can be used as indicators, alarm units or controllers.
The HTF™ aluminum oxide sensor is the product of years of intensive research and has been thoroughly field proven and performs better than other aluminum oxide moisture sensors on the market. HTF™ aluminum oxide sensor are manufactured with high uniformity. Consequently, sensors are freely interchangeable without factory calibration or changing of EPROMS, as is required with conventional aluminum oxide sensors.
Al203 oxide sensors measure changes in partial water vapor pressure (PWVP). They follow complicated principles of physical chemistry. Henry’s Law defines the relationship between PWVP and water concentration in PPMW (μg /g).
Henry’s Law PPMW(μg /g)=PWVP * K
K is Henry’s constant. This constant is effected by sample matrix and temperature. COSA Xentaur has developed a sample system with an integral “Grab” sample to facilitate the determination of K in the “real” process. The sample system can then be used on a routine basis to validate K.
The procedure required to make a small number of empirical measurement is quite easy. By utilizing the “grab” sample, K is easily calculated. This is done at 2 critical concentrations. This data is then incorporated into a look-up table. The table is completed utilizing Henry’s Law theory. By using this approach PPMW (ug/g) measurements are possible directly from the sensor.
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