• Intrinsically Safe Humidity and Temperature Transmitters

Intrinsically Safe Humidity and Temperature Transmitters

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The HMT360 series are the ideal solution for humidity control in hazardous areas.

  • They operate safely and reliably in explosive atmospheres of category 1 (zone 0).
  • Performance and proven technologies of HMT360 transmitters comply with international standards.


Caracteristics & Benefits

  • Measurement of humidity and temperature, and calculates other parameters: dew point, mixing ratio, absolute humidity and wet bulb temperature
  • Safe operation of the transmitter and sensor in ATEX zone: Category 1G / Zone 0 and 1D / Zone 20 with protective cover
  • Intrinsically safe
  • Excellent performance in harsh environments
  • The HUMICAP sensor is accurate and reliable and provides excellent long-term stability and negligible hysteresis
  • Five interchangeable probes
  • Temperature range from -40 to 180 ° C depending on the type of probe
  • NIST traceable (certificate included)


Intrinsic Safety

The entire HMT360 transmitter housing can be installed directly in explosive areas. The HMT360 transmitters can withstand continuous exposure to potentially explosive environments that contain flammable gases or dust.


Configuration Bespoke

Options and accessories offer great versatility to the HMT360 series. The user can specify the transmitter configuration when ordering, tutefois it is possible to change the configuration on site.


Five Interchangeables Sensors

The HMT360 offers five probe options for various applications
HMP361For wall mounting
HMP363For confined spaces
HMP364For applications under pressure
HMP365For high temperature
HMP368For high pressure applications

Interchangeable probes can be removed easily and quickly or reinstalled when needed. The modular structure facilitates the calibration and maintenance. The same control unit can be used for calibration of different HMT360 probes due to their interchangeability. All calibration parameters are included in the probe itself allowing great flexibility of use without accuracy is affected.


Optimized Sensors

In addition HUMICAP sensor, Vaisala also offers sensors for specific applications with presence of chemical compounds.


Long-term Solution

The HMT360 transmitters are a long term investment; their robust design and sustainable maintenance for the control of humidity and dewpoint in explosive environments. Calibration and maintenance contracts are available on request.


VAHMT360-0Humidity transmitter and intrinsically safe temperature
Interchangeable probes
VAHMP361-0Interchangeable probe for wall mounting
VAHMP363-0Interchangeable probe for confined spaces
VAHMP364-0Interchangeable probe for applications under pressure
VAHMP365-0Interchangeable probe for high temperature
VAHMP368-0Interchangeable probe for high pressure applications
Options and Accessories
VAHMP233FAHDuct installation kit for HMP363
VAHMP235FAMounting flange for HMP365 aluminum
VAHMP235FSMounting flange for HMP365 stainless
VADMP248BVSBall valve assembly for HMT368, pressure range at 20 ° C: 0 to 40 bar (at the necks of the installation, max 10 bar)
VA25905ZZ-Serial cable for PC RJ45 connectors - D9 female
VAHMT360SARProtective shelter against rain
VA214101-0Protective cover for use with flammable dust
VA211011-0Calibration kit adapter HMK15 for 12mm diameter probes
VA212483-0Galvanic isolator
VA210664-0Zener barrier
Relative humidity
Measuring range0 to 100%
Accuracy (including non-linearity and repeatability) max accuracy. reached from a high quality calibration with certified elements± 1% RH (0 to 90% RH)
± 2% RH (90 to 100% RH)
Accuracy (including non-linearity and repeatability) during a calibration saline (ASTM E104-85)± 2% RH (0 to 90% RH)
± 3% RH (90 to 100% RH)
Response time (90%) at 20 ° C15 seconds (in the constant flow air with sintered filter)
Humidity Sensors
  • HUMICAP 180 for typical applications
  • HUMICAP 1880L2 for applications operating in a demanding chemical environment
Measuring range-40 To 180 ° C (-40 to 356 ° F) depending on the selected probe
Electronics precision at 20 ° C± 0.1 ° C (± 0.18 ° F)
Electronics temp dependence.0005 ° C / ° C (0005 ° F / ° F)
Temperature sensorPt 1000 RTD 1/3 Class B IEC 751
Terms of use
Temperature range (operation of the electronics)-40 To 60 ° C
Temperature range with display-20 To 60 ° C
Storage temperature range-40 To 70 ° C
Pressure rangeSee CTG probes
In accordance withEMC EN61326-1: 1997 + Am1: 1998 + Am2: 2001
Industrial Environment
Note: Compliance with IEC 1000-4-5 only if it uses an external overvoltage limiter EXi approved in a non-explosive atmosphere
Entered and Outputs
Power supply12 to 28V
Supply voltage with serial port (service mode)15-28 V
Two analog outputs2 son 4 to 20mA (one as standard, optional)
Precision characteristic of analog output temperature0.005% / ° C of full scale
Analog outputsConnecting with barrier
RS232C serial output for maintenanceRJ45 connector
DisplayLCD two lines
Classification with current output
Europe / CENELEC (PTB)
EU (94/9 / EC, ATEX100a)II1G, Ex ia IIC T4
PTB 00 ATEX 2112 X
Safety factorUi = 28 V, Ii = 100mA, Pi = 0.7W
Ci = 1 nF, Li = 0 H
Environmental specificationsT amb: -20 to 60 ° C (-4 to 140 ° F)
P amb: 0.8 to 1.1 bar
Class I, II, III, Division 1, Groups AG and Division 2 Groups G and ASF
FM Project ID: 3010615
Factors of safetyVmax = 28 VDC, Imax = 100mA, Ci = 1 nF, Pi = 0.7W, Li = 0, T amb = 60 ° C (140 ° F),T5
Japan (TIIS)
Ex ia IIC T4
Code number: C15354
Factors of safetyUi = 28 VDC, Ii = 100 mA, Ci = 1 nF, Pi = 0.7W, Li = 0, T amb = 60 ° C (140 ° F)
Australia (TestSafe)
Ex ia IIC T5 IP65
Certificate No: Ex AUS Ex 3738X
Factors of safetyUi = 28 V, Ii = 100mA, Pi = 0.7W, Ci = 1 nF, Li = 0 mH
Canada (CSA)
  • Class I, Division 1 and Division 2, Groups A, B, C, D
  • Class II, Division 1 and Division 2, Groups G and dust resistance
  • Class III
Factors of safetyT amb = 60 ° C, T4, Intrinsically Safe losqu'il is hardwired following the recommendation DRW213478
Mechanical components
ConnectionsScrew terminals 0.33 à2.0mm 2
son (AWG 14-22)
GlandPg11 (5 to 12mm)
Connection to leadsPg11 / NPT 1/2 "-14
Material-40 To 60 ° C (-40 to 140 ° F)
Housing materialG-AlSi10Mg (DIN 1725)
Degree of protection housingIP65 (NEMA 4)
Housing weight950g