||A series of sensors that measure relative humidity and temperature. It is designed for outdoor applications. Alternative humidity variables are also reported (dew point/frostpoint temperature, wet bulb temperature,mixing ratio). Humidity measurement on the sensor is based on the capacitive thin film polymer HUMICAP sensor. Temperature measurement is based on platinum resistance (Pt100 RTD element, Class F 0.1 IEC 60751) sensors. The sensor is installed inside a radiation shield and is fitted with a digital RS-485 output. Active output and passive output models are available. The instrument can be fitted with standard humidity sensors, composite humidity sensors that are also suitable for heated applications or sensors resistant to chemical interfacing (INTERCAP, HUMICAP180R, HUMICAPR2, HUMICAP180C, HUMICAP180RC, HUMICAPR2C) It may also be fitted with an additional temperature sensor for enhanced temperature response. Several voltage output signal ranges: 0 -1 V, 0-5 V, 0-10 V. HMP155 replaces the HMP45 series of sensors.