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Model AMT-Ex Dew Point Transmitter Range


AMT-Ex Intrinsically Safe 4-20mA Transmitter

  • ATEX Certified 3 Wire Intrinsically Safe (I.S.) Dewpoint Transmitter
  • Certification - ATEX Marking:
    Ex II 1GD Ex ia IIC T4 Ex iaD 20 T135C (-20C ≤ Ta ≤ +60C)
  • Certification - IECEx Marking:
    BAS 07.0080 ia IIC T4 Ex iaD 20 T135C (-20C ≤ Ta ≤ +60C)
  • Ranges available between: -120C to +20C (-184C to +68C) Dewpoint
  • Accuracy 2C Dewpoint
  • AUTOMATIC CALIBRATION
  • Can be configured for Linear 4-20mA signal in: C & F Dewpoint, ppm(v), g/m3, lb/MMSCF
  • Temperature Compensation
  • Failure Diagnostics
  • Long Term Stability
  • Fast Response
  • IP66 / NEMA4X Protection
  • Also available as standard (See Model AMT dew-point transmitter)

Model AMT-Ex Dew-point Transmitter is used for continuous measurement of moisture content in a process gas and can also be used in compressed air applications. The transmitter will output a linear 4-20mA signal corresponding to the dewpoint temperature in either C & F Dewpoint, ppm(v), g/m3 or lb/MMSCF.

This long lasting Aluminium Oxide sensing element offers excellent sensitivity, repeatability and response speed. Each unit is supplied with a Certificate of Calibration traceable to International Humidity Standards, validating accuracy to 2C dewpoint.

Model AMT-Ex is ATEX certified and provides an Intrinsically Safe (I.S.) Dewpoint Transmitter for hazardous area use when installed with the appropriate isolator. Please see datasheet.

The transmitter also incorporates an Automatic Calibration (AUTOCAL) feature, which allows the user to carry out a field calibration / span check. The AUTOCAL feature is operated by means of two small button switches built within the transmitter enclosure. To avoid tamper the switches are locked in normal use and can only be activated by following a set procedure from the manual.

The integral RISC microprocessor circuitry of the Model AMT-Ex dew point transmitter allows high resolution with advanced self-diagnostics for fault conditions. It also enables periodic re-calibration of the moisture sensor, storing calibration data within the fully self-contained unit.

The mechanics of the Alpha Model AMT-Ex dewpoint transmitter have been designed to cope with extreme environmental conditions. The rugged stainless steel construction offers protection to IP66 (NEMA4X), with transmitter electrical connections made via a secure industrial connector.

Model AMT-Ex transmitter can withstand 35,000 kPa (350bar) maximum pressure. By employing a low resistance cable, the transmitter can be located at significant distances in excess of 1000 metres from the safe area.

Designed with the operator in mind for reliable and accurate measurements, the Alpha Model AMT-Ex is extremely easy to install and operate requiring little or no maintenance.

Supplied with a Certificate of Calibration, an instruction manual and 2m connecting cable as standard.

Sample Systems are also available and made to customers specifications.
Clicking the link will navigate you to our sister site amsystems.co.uk/sample systems.

Please contact us for more information.


Model AMT-Ex Dewpoint Transmitter Datasheet.pdf
(requires Adobe acrobat)

alpha moisture systems
Alpha House, 96 City Road
BRADFORD, ENGLAND BD88ES
t:+44 (0)1274 733 100  f:+44(0)1274 733 200