GENEQ > Meteorology > Transmitters

Humidity and Temperature Transmitters for Industrial Applications
HMT330 Series

  
FEATURES AND BENEFITS
  • Six models for demanding industrial applications
  • Full 0 to 100 %RH measurement, temperature range up to + 180°C (+356°F), depending on model
  • Pressure tolerance up to 100 bar (depending on model)
  • Vaisala HUMICAP Sensor for excellent accuracy and stability
  • Shows measurement trends and 1 -year history graphically
  • Multilingual user interface
  • Excellent performance in harsh chemical concentrations
  • Corrosion resistant IP65 housing
  • NIST traceable (certificate included)
    		•
    The HUMICAP Humidity and Temperature Transmitter Series HMT330 is designed for demanding industrial applications where stable measurement and wide customization possibilities are important.

    HUMICAP PERFORMANCE
    The HMT330 series incorporates Vaisala's 30 years of experience in industrial humidity measurement. The sensor measures accurately and reliably and is immune to particulate contamination and most chemicals.

    CHEMICAL PURGE MINIMIZES EFFECTS OF CONTAMINANTS
    Chemical purge minimizes effects of contaminants In environments with high concentrations of chemicals and cleaning agents, chemical purge helps to maintain the 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.

    GRAPHICAL MEASUREMENT TREND AND HISTORY DISPLAY
    The HMT330 can be ordered with a large numerical and graphical display, allowing the user to easily monitor measurement trends and I-year history.
    Data collection and transfer to PC

    DATA COLLECTION AND TRANSFER TO PC
    The recorded measurement data can be viewed on the display or transferred to PC with Windows based software.

    MANY WAYS TO INSTALL
    Mains and DC power options, and several mounting accessories make it easy to install the instrument.

    VERSATILE OUTPUTS
    The HMT330 can have up to three analog outputs. Galvanic isolation of supply power and analog outputs is also available. For digital communication, the RS-232, RS-485 or relay outputs can be used.

    FLEXIBLE CALIBRATION
  • The HMT330 instruments are factorycalibrated at six humidity points.
  • A quick one-point field calibration can be performed with the hand-held HM70 meter.
  • A two-point calibration can be performed with the HMK15 salt bath calibrator in a controlled environment.
  • The transmitter can be sent to Vaisala for recalibration. Accredited calibrations and maintenance contracts are also available.
    		•

    SPECIFICATIONS
    Performance
    Relative Humidity
    Measurement Range 0 to 100% RH
    Accuracy against factory standards including non-linearity, hysteresis and repeatability
    at +20°C
    		± 1 %RH (0 to 90 %RH)
    ±1.7 %RH (90 to 100 %RH)
    at -20 to +40°C
    		 ± (1.0 + 0.008 x reading) %RH*
    at -40 to -20°C, +40 to +180°C
    		± (1.5 + 0.015 x reading) 90W
    Factory calibration uncertainty** (+20°C) 0 to 40 %RH: ± 0.6 %RH
    40 to 97 %RH: ±1.0 %RH
    Humidity sensors for typical applications Vaisala HUMICAP 180
    Humidity sensors chemical purge/warmed probe Vaisala HUMICAP 180C
    Humidity sensors high chemical concentrations* Vaisala HUMICAP 180L2*
    * For Vaisala HUMICAP 180L2 sensor at -10...+40°C ± (1.0 + 0.01 x reading) %RH; at -40...-10°C,+40...+180°C ± (1.5 + 0.02 x reading) I/O RH
    ** Defined as +2 standard deviation limits. Response time (90 %) at 20°C in still air with grid filter: 8 s; with grid + steel netting filter: 20 s; with sintered filter: 40s
    Temperature
    Measurement range
  • HMT331: -40 +60°C
  • HMT333: -40 +80°C
  • HMT334, HMT335, HMT337, HMT338: -70 +180°C
    		•
    Accuracy at +20°C (+68°F) 0.2°C
    Accuracy over temperature range
    Temperature sensor Pt 100 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
    Operating temp. for probe Same as measurement ranges
    Operating temp. for transmitter body -40 to 60°C
    Operating temp. for transmiter body with display 0 to 60 °C
    Operating pressure (HMT334) 0 to 10 MPa (0 to 100 bar)
    Operating pressure (HMT338) 0 to 4 MPa (0 to 40 bar)
    Operating pressure (HMT333, HMT335, HMT337) Vapor tight
    Electromagnetic compatibility Complies with EMC standard EN61326-1:1997 + Am1:1998 + Am2:2001
    Inputs & Outputs
    Operating voltage 10 to 35 VDC, 24 VAC
    Operating voltage with optional power supply module 100 to 240 VAC, 50/60Hz
    Power consumption @ 20°C (Uin 24 VDC)
    RS232
    		 Max. 25mA
    Uout 2 x 0 to 1V / 0 to 5V / 0 to 10V
    		 Max 25mA
    Iout 2 x 0 to 20mA
    		 Max 60mA
    display and baclight
    		 +20mA
    during probe heating (HMT337)
    		 +120mA
    Analog outputs (2 standard, 3rd optional)  
    current output
    		 0 to 20mA, 4 to 20mA
    voltage output
    		 0 to 1V, 0 to 5V, 0 to 10V
    Accuracy of analog outputs @ 20°C ±0.05% full scale
    Temperature dependence of the analog outputs ±0.005% full scale
    External loads current outputs RL < 500ohm
    External loads 0 to 1V outputs RL > 2 kohm
    External loads 0 to 5V and 0 to 10V outputs RL > 10 kohm
    Max wire size 0.5mm2 (AWG 20) stranded wires recommended
    Digital outputs RS232, RS485 (ptional)
    Relay outputs (optional) 0.5A, 250 VAC
    Display LCD with backlight, graphic trend display of any parameter
    Menu languages English, French, Spanish, German, Japanese, Swedish, Finnish
    Mechanics
    Cable feed through alternatives cable bushing M20 x 1.5 (cable diameter 8 to 11 mm)
    Conduit fitting M20 x 1.5 / 1/2 in. NPT
    Conduit fitting 8-pole connector (male) RSFM5 / 0.5
    Conduit fitting 8-pole connector with 5 m cable (female) RKT5-24 / 3M
    Probe cable diameter HMT323: 6.0 mm; Other probes: 5.5 mm
    Housing material G-AlSi 10 Mg (DIN 1725)
    Housing classification IP 65 (NEMA 4)