With the help of two included sensors, the PLS 1000 can measure the current relative humidity and temperature in two environments. The PLS 1000 calculates the absolute humidity and the respective dew points from these values. Based on these values, various humidity and temperature controls can be implemented using five integrated functions (modes). Room fans for supply or exhaust air can be directly controlled via four integrated potential-free relays. Typical applications include measuring humidity and temperature, automatic ventilation, drying or humidifying rooms, manual control of room fans, and the implementation of a two-channel temperature and humidity switch.