Model AMT-Ex Dewpoint Transmitter0 pages

Model AMT-Ex
Intrinsically Safe 4-20mA Dewpoint Transmitter
Model AMT-Ex Dew-point Transmitter is a 3-wire 4-20mA transmitter, used for
continuous measurement of humidity in dry process gases or dry compressed
air. The Model AMT-Ex transmitter can also be factory congured to
output a linear 4-20mA signal for any other moisture unit e.g. ppm(v),
ppm(w), g/m3 and lb/MMSCF etc.

Fast Response - Stable - Reliable - Accurate
- Easy to Install.
The long lasting sensing element oers excellent sensitivity,
repeatability and speed of response. Each unit is supplied with a
Certicate of Calibration, traceable to International Humidity
Standards.

FEATURES
• 3 Wire Intrinsically Safe Dewpoint Transmitter
•
II 1GD Ex ia IIC T4 Ex iaD 20 T1350C
(-200C ≤ Ta ≤ +600C)
• Overall Range: -1200C to +200C Dewpoint
• Accuracy ± 20C Dewpoint
• INTEGRATED AUTOMATIC CALIBRATION
Model AMT-Ex is ATEX certied and provides an
Intrinsically Safe Dew Point Transmitter for hazardous
area use when installed with the appropriate isolator.
See Illustration oposite and additional information on
pages 2 and 4.

Measuring instrument
conforms with
EN 61326

• Can be congured for Linear 4-20mA signal
in: 0C & 0F Dewpoint, ppm(v), g/m3, lb/MMSCF
• Fault Diagnostics
• Long Term Stability
• Fast Response time
• IP66 / NEMA4X Protection
Hazardous and
Zoned Areas

This online dew point transmitter also incorporates an
Automatic Calibration (AUTOCAL) feature that allows
the user to carry out a eld calibration / span check.
The AUTOCAL feature is operated by two small button
switches built within the transmitter enclosure.

Safe Control Area

4-20mA

-63.2

Transmitter

Isolator

Hygrometer
Display

See wiring options on pages 3 & 4
Up to 1km

The integral RISC microprocessor circuitry of the Model AMT-Ex 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 Model AMT-Ex
transmitter have been designed to cope with extreme environmental conditions. The rugged stainless
steel construction oers protection to IP66 (NEMA4X), with the transmitter electrical connections made
via a secure industrial connector.
Model AMT-Ex transmitter can withstand 35,000 kPa (350bar) maximum pressure and by employing a low
resistance cable, the transmitter can be located at signicant distances in excess of 1000 metres from the
control room.
The Model AMT-Ex transmitter is supplied with a Certicate of Calibration, an instruction manual and 2m
connecting cable.
Dew-point Sampling Systems available - see www.amsystems.co.uk for more details.
© Alpha Moisture Systems Ltd.

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