HMP8 Relative Humidity and Temperature Probe for Pressurized and Vacuum Processes Features • RH accuracy up to 0.8 %RH • Temperature accuracy up to 0.1 °C (0.18 °F) • Operating pressure 0 ... 4 MPa (0 ... 40 bar) • Temperature measurement range -70 ... +180 °C (-94 ... +356 °F) • Sensor purge provides superior chemical resistance • Probe installation depth can be freely adjusted and probe can be hot-swapped from pressurized pipelines with an installation valve • Modbus RTU over RS-485 • Plug & play compatible with Indigo series of transmitters • Traceable calibration certificate: 5 points for humidity, 1 point for temperature Vaisala HUMICAP® Humidity and Temperature Probe HMP8 is designed for pressurized applications in compressed air systems, refrigerant dryers, and other pressurized industrial applications, where easy insertion and removal of the probe and adjustable installation depth into the pipeline are needed. 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. HUMICAP® technology results from Vaisala's 40-year experience in industrial humidity measurement, providing the best stability, fast response time, and low hysteresis in a wide range of applications. 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. The chemical purge involves heating the sensor to remove harmful chemicals. The function can be initiated manually or programmed to occur at set intervals. Flexible Connectivity The probe is plug and play compatible with Vaisala Indigo series of transmitters, or it can be used as a standalone digital Modbus RTU transmitter over RS-485 serial bus. For easy-to-use access to field calibration, device analytics, and configuration functionality, the probe can be connected to Vaisala Insight” Software (see www.vaisala.com/insight). Vaisala Indigo Product Family Indigo transmitters offer a variety of connectivity options through analog signals or digital outputs, configurable relays, and wireless (WLAN) configuration interface, providing a suitable solution for all industrial humidity measurements. The cable length between the probe and transmitter can be extended to up to 30 meters. For more information, see www.vaisala.com/indigo.

Technical Data Measurement Performance Relative Humidity Operating voltage Measurement range Accuracy at +23 °C (+73.4 °F) 1) Temperature Sensor Output Parameters Measurement range Default serial settings Digital output Current consumption Relative humidity, temperature, dew point temperature, wet-bulb temperature, absolute humidity, mixing ratio, water concentration, water mass fraction, water vapor pressure, enthalpy Defined against calibration reference Mechanical Specifications Probe fitting Materials Probe Probe body Cable jacket HMP8 Humidity Measurement Accuracy as a Function of Temperature...