Model AMT-Ex Intrinsically Safe 4-20mA Dew point Transmitter

Model AMT-Ex is a three wire 4-20mA dew-point transmitter used for continuous measurement of moisture content in process gases and compressed air, which will output a linear 4-20mA signal in C & F corresponding to the dewpoint temperature. Factory configurations to output a 4-20mA linear signal for ppm(v), ppm(w), g/m3 and lb/MMSCF are also available.

The long lasting Aluminium Oxide sensing element offers excellent sensitivity, repeatability and response speed. Each unit is supplied with a Certificate of Calibration from our in-house calibration laboratory, traceable to International Humidity Standards, validating accuracy to 2C dewpoint.

  • Model AMT-Ex is ATEX certified and provides an Intrinsically Safe Dewpoint Transmitter for hazardous area use when installed with the appropriate isolator. See AMT-Ex datasheet below.
  • 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 (-184F to +68F) Dewpoint
  • Accuracy 2C Dewpoint
  • AUTOMATIC CALIBRATION
  • Can be configured for Linear 4-20mA signal Dewpoint, ppm(v), g/m3 and lb/MMSCF
  • Temperature Compensation
  • Failure Diagnostics
  • Long Term Stability
  • Fast Response
  • IP66 / NEMA4X Protection

The AMT-Ex transmitter also incorporates an Automatic Calibration (AUTOCAL) feature as standard that allows the user to carry out field calibration and/or span checks quickly. The AUTOCAL feature is operated by means of two small button switches built within the transmitter enclosure as can be seen on the picture. To avoid tamper, the switches are locked in normal use and can only be activated by following the routine set out in 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 dew-point sensor, storing calibration data within the fully self-contained unit.

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

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

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

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

Sampling Systems are available for transmitter and passive sensor type hygrometers.

Dewpoint Transmitters

Model AMT | Model ADHT-Ex | Model PDT | Sensor Technology | Model AMT-Ex


Moisture Calculator | Contact Us