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 data logger 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.
Measure humidity in harsh environments with the best-in-class transmitter you can truly depend on. The Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT330 is ideal for applications where stable measurement is essential. 10-year warranty* proves the outstanding reliability. With multiple options to choose from, including local display, the HMT300 series can be tailored to meet the specific needs of each individual application.
Six models for demanding applications:
HMT330-Datasheet-B210951EN-I （PDF 805KB ）
HMT330 DMT340 MMT330 Wiring Diagram(PDF 359KB)
DNV Certificate A-13529 (PDF 212KB)
| Relative humidity measurement | |
| Measurement range
|
0 ... 100 % RH
|
| Accuracy at +20 °C (68 °F) | ± 1.0 % RH (0 ... 90 % RH) ± 1.7 % RH (90 ... 100 % RH) |
| Sensor | Vaisala HUMICAP® 180 |
| Temperature measurement | |
| Measurement range HMT331 HMT333 HMT334/335/337/338 |
-40 ... +60 °C -40 ... +80 °C -70 ... +180 °C |
| Accuracy at +20 °C (68 °F) | ± 0.2 °C |
| Sensor | Pt100 RTD 1/3 Class B IEC 751 |
| Other variables available (depends on model) | |
| Dewpoint, temperature, mixing ratio, absolute humidity, wet bulb temperature, enthalpy, water vapor pressure. | |
| Operating environment | |
| Temperature for probe for transmitter body with display |
same as measurement ranges -40 ...+ 60 °C (-40 ... +140 °F) 0 ...+ 60 °C (+32 ... +140 °F) |
| Pressure HMT334 HMT338 HMT333/335/337 |
0 ... 10 MPa (0 ... 100 bar) 0 ... 4 MPa (0 ... 40 bar) vapor tight |
| Inputs and outputs | |
| Operating voltage with optional power supply module |
10 ... 35 VDC, 24 VAC 100 ... 240 VAC 50/60 Hz |
| Power consumption @ 20 °C (U in 24 VDC) RS-232 U out 2 x 0 ... 1 V/ 0 ... 5 V/ 0... 10 V I out 2 x 0 ... 20 mA V |
max. 25 mA max. 25 mA max. 60 mA |
| Analog outputs | 0 ... 20 mA, 4 ... 20 mA, 0 ... 1 V, 0 ... 5 V, 0 ... 10 V |
| Digital outputs | RS-232, RS-485 (optional) |
| Menu languages | English, French, Spanish, German, Japanese, Swedish, Finnish |
| Mechanical | |
| Probe cable diameter HMT333 other probes |
6.0 mm 5.5 mm |
| Material (housing) | G-AlSi 10 Mg (DIN 1725) |
| Housing classification | IP65 (NEMA 4) |
vn180_Humidity_measurement_in_cleanrooms (PDF 240KB)
Outdoor-Humidity-App Note-B210967EN-A-lores (PDF 174KB)
CEN-TIA-G-Eight Things to Consider-B211371EN-A (PFD 271KB)
CEN-Global-Calibration-and-Adjustment-of-RH_Instruments-B210804EN-B-LOW-v2 (PDF 240KB)
CEN-TIA-G-Precision-airconditioning-leaflet-B211292EN-A-LOW (PDF 409KB)
CEN-G-HMT330-and-viewLinc-Application-note-B211514EN (PDF 352KB)
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 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.
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 HMT335 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.
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.
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.
HMT330_Series_Brochure (PDF 2MB)HMT330-Uer-Guide (PDF 3MB)CEN-TIA-G-Valio-Customer-Story-B211288EN-A (PDF 316KB)CEN-TIA-G-Taizhou-customer-story-B211390EN-B-LOW (PDF 356KB)CEN-TIA-G-CeramicsDrying-Success-Story-B211389EN-A-LOW (PDF 210KB)CEN-TIA-Caldwell Energy_Success Story_B211409EN-A (PDF 1MB)
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