The APS-200 Sensor is unique among polymer sensors. Virtually every other capacitive sensor is composed of a humidity sensitive dielectric material with metal electrodes. The APS-200 is manufactured from a unique, humidity sensing polymer film and the conductor plates of the capacitor are composed of a conductive, humidity-permeable polymeric film. No metal electrodes are used in the APS-200. The APS-200’s unique design makes it especially resistant to aggressive
chemical environments, including chlorine and ammonia. Swimming pool areas, in particular, feature chlorine-laden air that normally attacks sensors with metal electrodes. The APS-200 is ideal for use in such environments. An additional advantage of the APS-200 sensor is that it is virtually free of drift.

Even after one week’s exposure to temperatures of 85°C and 85% RH, the tested sensor drifted only 6%. In a test in which it was exposed to 110°C temperatures and 5% RH, it drifted a mere 3%. In both of these cases, the sensor also returned to nominal values after exposure to room temperature air and humidity.

The APS-200 sensor also offers a very wide operating range of -20°F to +140°F (-29°C to +60°C) and 0-100% RH. Like the G-CAP2 sensor, the APS-200 sensor is available in an uncalibrated version for customers with calibration capabilities.