A polymer-based humidity sensor works by measuring the change in electrical resistance of a polymer film as the humidity in the air changes.
The sensor typically consists of a thin film of polymer material that is sensitive to changes in humidity. The film is sandwiched between two electrodes, and when humidity changes, the electrical resistance of the film also changes. This change in resistance is then converted into a measurable electrical signal, which can be used to indicate the humidity level.
In compressed air systems, the humidity sensor is typically mounted in the compressed air pipe, where it is exposed to the air stream. As the air passes through the sensor, it causes the polymer film to absorb or release moisture, which in turn causes a change in the electrical resistance of the film. This change in resistance is then measured and used to determine the humidity level of the air.
Polymer-based humidity sensors have a number of advantages over other types of humidity sensors. They are typically more accurate and stable than other types of sensors, and they have a wide measurement range. They are also relatively low cost and easy to install.
It’s important to note that the accuracy of the humidity measurement may depend on several factors such as the specific polymer used, the temperature, the pressure and the contaminants present in the air. It’s also important to follow the manufacturer’s instructions for the installation and operation of the sensor to ensure accurate and reliable results.
