Model AMT is a two wire 4-20mA loop powered dew-point transmitter, used for continuous
measurement of humidity in a process gas or compressed air, which will output a linear 4-20mA signal corresponding
to the dewpoint temperature. The Model AMT transmitter can also be factory configured to output a 4-20mA linear
signal for any other moisture unit e.g. ppm(v), ppm(w), g/m3, lb/MMSCF etc.
The Ultra High Capacitance sensing element is long lasting and offers excellent sensitivity, repeatability and response
speed. Each unit is supplied with a Certificate of Calibration, traceable to International Humidity Standards, validating
accuracy to ±2ºC dewpoint.
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 special routine.
- 2 Wire Loop Powered Dewpoint Transmitter
- Overall Range -120°C to +20°C Dewpoint
- Accuracy ± 2°C Dewpoint
- AUTOMATIC CALIBRATION
- Can be Configured for Linear 4-20mA signal in:
°C & °F Dewpoint, ppm(v), ppb(v), g/m3, lb/MMSCF
- Temperature Compensation
- Failure Diagnostics
- Long Term Stability
- Fast Reponse
- IP 66 / NEMA4X Protection
- Supplied with Calibration Certificate Traceable to National & International Humidity Standards
The integral RISC microprocessor circuitry of the Model AMT transmitter allows high resolution with advanced selfdiagnostics
for fault conditions. It also enables periodic re-calibration of the moisture sensor, storing calibration data
within the fully self contained unit. Loop powered by a 7V to 28V dc source, the Model AMT transmitter will provide a
linear 4-20mA signal over the chosen range.
The mechanics of the Model AMT transmitter have been designed to cope with extreme environmental conditions. The
rugged stainless steel construction offers protection to IP66 (NEMA4X), with the transmitter electrical connections
made via a secure industrial connector.
Model AMT transmitter can withstand 35,000 kPa (350bar) maximum pressure and by employing a low resistance
cable, the transmitter can be located at significant distances, in excess of 1000 metres, from the control room.
Designed with the operator in mind, for reliable and accurate measurements, the Model AMT transmitter is extremely
easy to install and operate, requiring little or no maintenance.
The Model AMT transmitter is supplied with a Certificate of Calibration, an instruction manual and 2m connecting