Datasheet Contact Us Buy Now Relative Humidity and Temperature Probe HMP4 for high pressures Image Vaisala HUMICAP® Humidity and Temperature Probe HMP4 is designed for high-pressure applications such as compressed air systems in maritime, breathing air, and industrial applications, where measurement performance and chemical tolerance are essential. The HMP4 is part of the Indigo product family and compatible with Indigo500 and Indigo200 series transmitters and free Insight PC Software. Click here to download bid specs for USA. Features RH accuracy up to 0.8 %RH, Temperature accuracy up to 0.1 °C (0.18 °F) Temperature measurement range -70 ... +180 °C (-94 ... +356 °F) Operating pressure 0 ... 10 MPa (0 ... 100 bar) Sensor purge provides superior chemical resistance Modbus RTU over RS-485 Plug & play compatible with Indigo™ series of transmitters Traceable calibration certificate: 5 points for humidity, 1 point for temperature + Show more Key Benefits Proven Vaisala HUMICAP performance Vaisala is the original innovator of the thin-film capacitive humidity measurement technology, which has now become the industry standard in humidity measurement. Chemical purge minimizes effects of contaminants In environments with high concentrations of chemicals and cleaning agents, the chemical purge option helps to maintain measurement accuracy between calibration intervals. Flexible connectivity The probe is plug and play compatible with Vaisala Indigo series transmitters, can be used as a standalone digital Modbus RTU transmitter, or connected to Vaisala Insight™ PC Software. Watch the video Vaisala Indigo Family humidity and temperature probes Downloads Datasheet (304.37 KB) HMP4 Relative Humidity and Temperature Probe Download the Datasheet Manual: HMP Series User Guide (3.91 MB) Datasheet: Indigo520 Transmitter Manual: HMP Series Multilingual Quick Guide (EN, JA) (1.26 MB) Brochure: Vaisala Indigo Family catalog (2.66 MB) Comparison table: Vaisala HUMICAP Indigo and HMT330 Humidity and Temperature Series Comparion Table (138.1 KB) Datasheet: Indigo510 Transmitter Datasheet: Vaisala HUMICAP® Humidity Sensors (286.61 KB) Comparison table: Comparison of Indigo transmitters and Indigo compatible probes for humidity applications (1.47 MB) All downloads Product Resources Humidity calculator Read more Indigo500 series dual-probe support Read more What is a smart measurement probe and what makes it special? Read more Services Standard calibration Accredited calibration Repair service Need support? Need to calibrate? Sign up for news Contact us