Vaisala HMT330 Series Humidity & Temperature Transmitters

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The Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT330 is designed for demanding industrial applications where stable measurement and wide customization is important. The HMT330 series incorporates an updated, stable and chemical resistant HUMICAP® sensor.

In environments with high concentrations of chemicals and cleaning agents, chemical purge helps to maintain measurement accuracy between calibration intervals. Chemical purge involves heating the sensor to remove harmful chemicals. The function can be initiated manually or programmed to occur at set intervals.

The HMT330 can be ordered with a large numerical and graphical display, which allows the user to clearly monitor operational data, measurement trends and 1-year measurement history. The display alarm allows tracking of any measured parameter, with a freely configurable low and high limit.

The optional datalogger with real-time clock makes it possible to generate over four years of measured history. The recorded measurement data can be viewed on the display or transferred to a PC with Microsoft Windows® software. The transmitter can also be connected to a network with an optional (W)LAN interface, which enables a (wireless) Ethernet connection. A USB-RJ45 cable makes it easy to connect the service port of the HMT330 to a PC.

Vaisala HMT331 for Wall-Mounted Applications

The HMT331 offers higher measurement performance, better chemical tolerance, advanced graphical display features, more powering options, more output options and a wider variety of output humidity parameters compared to regular wall-mounted transmitters. Applications include: cleanrooms, pharmaceutical processes, greenhouses, swimming halls, museums and archives.

Vaisala HMT333 for Ducts and Tight Spaces

Vaisala HMT333 Transmitters are a versatile instrument for applications where a small remote probe is needed. An installation kit is available with an aluminum flange, lead-through piece, and steel support bar to install the probe in ducts, channels and through walls.

Vaisala HMT334 for High Pressure and Vacuum Applications

The Vaisala HMT334 Transmitter is designed to measure humidity in pressurized spaces or vacuum chambers. Each probe is tested to ensure a gas and vacuum tight installation. The sensor is immune to particulate contamination and most chemicals.

Vaisala HMT334 for High Temperatures

Vaisala HMT334 Transmitters have a long stainless steel probe designed for high temperatures. It is ideal for duct measurements. The probe tolerates mechanical stress and withstands high flow rates. The HMT335 can be used, for example, in a hot drying process.

Vaisala HMT337 for High Humidity Applications

The HMT337 is delivered in one of three configurations:

• Basic: Non-warmed probe for moderate humidity
• Warmed Probe: For near-condensing conditions and dew point measurement
• Warmed Probe and additional temperature sensor: For near-condensing conditions and relative humidity measurement

The warmed probe provides fast and reliable measurement in environments where humidity is near saturation. The warming prevents condensation from forming on the sensor.

Vaisala HMT338 for Pressurized Pipelines

The Vaisala HMT338 Transmitter is ideal for installations in pressurized processes where the probe needs to be removed while the process is running ("hot tapping") without the need for venting of lowering the process pressure.

Documents

• Vaisala HMT330 Series Humidity and Temperature Transmitter Data Sheet PDF (1.4 MB)
• Vaisala HMT330 Series Humidity and Temperature Transmitter User Guide PDF (2.5 MB)
• All possible part numbers