Humidity measurement.

During the rubber/polymer compounding process, obtaining more key parameter information is said to improve product quality and processing time. From the internal or other mixer stages to the finished product, optimized information retrieval is said to be desirable. Productivity rate and uniform quality are said to require a variety of sensors and real-time test procedures, including the measurement of temperature, pH, viscosity, uniformity, etc. Another important parameter is said to be moisture monitoring at elevated temperatures in the 50 to 200[degrees]C range. Conventional humidity sensors do not survive high temperatures or harsh environments, according to the company. The solution is said to be a sensor method which uses thermistors to measure vapor content in water or other carrier gases. The OHMIC system measures the mass of air or gases in unit volume. It is called absolute humidity and is expressed in grams/meter cubes. This is in contrast to relative humidity, which is the measure of the amount of water vapor in the air compared with the amount air can hold at a given temperature. The two measurements are said to be easily convertible. The Model AHT-200 uses thermal conductivity sensors to measure moisture content at elevated temperatures up to +200[degrees]C. The unit is said to outperform conventional capacitive/resistance humidity sensors in harsh environments and is said to recover from deposits and condensation. (Ohmic Instruments)

Circle 106 on card