Model AMT Dewpoint Transmitter

Delta Instrument AMT

Two wire 4-20mA transmitter designed for continuous measurement of moisture content in gases or compressed air.

Model AMT Dewpoint Transmitter
  • Description
  • Specification
  • Application
  • Options
  • Downloads

Model AMT Dewpoint Transmitter

4-20mA. Ranges available between -184°F to +68°F (-120°C to +20°C)

Model AMT Dewpoint Transmitter is a two wire 4-20mA loop powered transmitter, used for continuous measurement of moisture in dry process gases or dry 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.

  • Fast Response.
  • Low Cost Solution.
  • Simple to Install and set up.
  • Reliable.
  • Accurate.
  • Stable results

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 better than ±3.60F (±20C) dewpoint.

  • 2 Wire Loop Powered Dewpoint Transmitter.
  • Overall Range: -1840F to +680F Dewpoint.
  • Accuracy better than ± 3.60F Dewpoint.
  • INTEGRATED AUTOMATIC CALIBRATION.
  • Can be configured for linear 4-20mA signal in: 0F & 0C dewpoint, ppm(v), ppb(v), g/m3 & lb/MMSCF.
  • Temperature Compensation.
  • Failure Diagnostics.
  • Long Term Stability.
  • Fast Response Time.
  • NEMA4X (IP66) Protection

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 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 specific routine from the manual.

The integral RISC microprocessor circuitry of the Model AMT 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. 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 NEMA4X (IP66), with the transmitter electrical connections made via a secure industrial connector.

Model AMT transmitter can withstand 5,076PSIA (350barA) maximum pressure and by employing a low resistance cable, the transmitter can be located at significant distances, in excess of 3300 feet (1km), 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.

Note: The Model AMT is not suitable for Ammonia (NH3), Chlorine (CI) and Hydrogen Chloride (HCI). SF6 can be monitored with no effect to the sensor element. Sulphur Dioxide (SO2) can be monitored if the moisture content is low, less than 100ppm(v).

The Model AMT transmitter is supplied with a Certificate of Calibration, an instruction manual and 2m connecting cable.

Model AMT Dewpoint Transmitter

MODEL AMT Dewpoint Transmitter

4-20mA Loop Powered Transmitter

TRANSMITTER TYPE: 2 Wire, 4-20mA Loop Powered Transmitter

OUTPUT SIGNAL: 4 to 20mA Linear

OPERATING VOLTAGE: 7V – 28V dc. Reverse polarity protected.

MAXIMUM SERIES RESISTANCE: = {40 x (Supply Voltage – 7)} ohms

SENSING ELEMENT: Ultra High Capacitance – Aluminium Oxide Type

RANGES: See How to Order Below

AUTOCAL: Field calibration / Span check facility. Activated and operated via two button switches on the Transmitter body. Locked in normal operating mode to avoid tamper.

FACTORY CALIBRATION: Supplied with Certificate of Calibration traceable to NIST / NPL

ACCURACY: Better than ±3.6°F (±2°C) dewpoint (NIST / NPL traceable for range -130°F to +68°F)

TEMPERATURE COEFFICIENT: Temperature compensated for operating range.

REPEATABILITY: Better than ±0.54°F dewpoint

OPERATING TEMPERATURE: -4°F to +140°F (-20°C to +60°C)

STORAGE TEMPERATURE: -4°F to +158°F (-20°C to +70°C)

OPERATING PRESSURE: From 0.145PSIA (0.01 barA) to Maximum 5,076PSIA (350barA)

OPERATING HUMIDITY (External): Maximum – 95% RH Non-condensing

SAMPLE FLOW RATE: Flow independent but ideally 2 to 5 litres per minute. Max: 25 litres/min.

CABLE TERMINATIONS: NEMA4X (IP66) rated, size C, DIN EN 175301 connector at the Transmitter and other end terminated with bootlace ferrules.

CABLE: Supplied with 6.6 feet standard cable. Nominal diameter 0.13 inches (3.3mm), 92ohms/km at 68°F (20°C)

ELECTROMAGNETIC COMPATIBILITY (EMC): Complies BS EN 61326-1

WARM UP TIME: 10 seconds

FAULT CONDITIONS:
Open Circuit : Output drives to 20.50mA
Short Circuit : Output drives to 20.75mA

ISOLATION: Sensing Element connected to the 4-20mA loop but isolated from Transmitter body.

TRANSMITTER ENCLOSURE: 316 Stainless steel body with size C, DIN EN 175301 connector.

SENSOR PROTECTION: 316 Sintered stainless steel filter – 50 micron

PROBE MATERIAL (WETTED PARTS): 316 Stainless Steel

WEATHERPROOF CLASSIFICATION: NEMA4X (IP66) when connector mated to transmitter.

MECHANICAL CONNECTION: 3/4” UNF (16tpi) with integral Viton “O” ring seal.

MECHANICAL WARRANTY: 24 months in case of faulty workmanship and defective parts.

CALIBRATION WARRANTY: 12 months.

ACCESSORIES INCLUDED: Standard 2 meter connecting cable.

  • Dewpoint or Trace Moisture in Gases.
  • Dewpoint or Trace Moisture in Dry Compressed Air.
  • Fluid bed dryers
  • Refrigerant dryers
  • Desiccant wheel dryers
  • Rotary wheel dryers
  • Turbine air intakes
  • Wind tunnels
  • HVAC applications
  • Cool stores
  • Air braking systems
  • Condensation alarms
  • Controlled atmosphere environments
  • Precision engineering applications
  • Heat treatment gases
  • Environmental chambers
  • Product drying
  • Ambient air monitoring
  • Gas turbine frost protection systems
  • Switchgear monitoring

The AMT Transmitter can be paired with the Model DS1200 if a Display is required. Click here for more details.

Model AMT + [xxxx] (xxxx=Range Code)

Range CodeRange
RDF:-112°F to -4°F (-80°C to -20°C) dewpoint resolution 0.1°F / °C
SRF:-166°F to -4°F (-110°C to -20°C) dewpoint resolution 0.1°F / °C
GYF:-112°F to +32°F (-80°C to 0°C) dewpoint resolution 0.1°F / °C
PLF:-148°F to +32°F (-100°C to 0°C) dewpoint resolution 0.1°F / °C
BLF:-112°F to 68°F (-80°C to +20°C) dewpoint resolution 0.1°F / °C
SDF:-148°F to +68°F (-100°C to +20°C) dewpoint resolution 0.1°F / °C
SSRF:-184°F to +68°F (-120°C to +20°C) dewpoint resolution 0.1°F / °C
LDF:-184°F to +68°F (-120°C to +20°C) dewpoint resolution 0.1°F / °C
SHDF:-85°F to +32°F (-65°C to 0°C) dewpoint resolution 0.1°F / °C
HDF:-85°F to +68°F (-65°C to +20°C) dewpoint resolution 0.1°F / °C
RDC:-80°C to -20°C (-112°F to -4°F) dewpoint resolution 0.1°F / °C
SRC:-110°C to -20°C (-166°F to -4°F) dewpoint resolution 0.1°F / °C
GYC:-80°C to 0°C (-112°F to 32°F) dewpoint resolution 0.1°F / °C
PLC:-100°C to 0°C (-148°F to 32°F) dewpoint resolution 0.1°F / °C
BLC:-80°C to +20°C (-112°F to 68°F) dewpoint resolution 0.1°F / °C
SDC:-100°C to +20°C (-148°F to 68°F) dewpoint resolution 0.1°F / °C
SSRC:-120°C to -20°C (-184°F to -4°F) dewpoint resolution 0.1°F / °C
LDC:-120°C to +20°C (-184°F to 68°F) dewpoint resolution 0.1°F / °C
SHDC:-65°C to 0°C (-85°F to 32°F) dewpoint resolution 0.1°F / °C
HDC:-65°C to +20°C (-85°F to 68°F) dewpoint resolution 0.1°F / °C
GYP:1 to 6000 ppm(v) resolution = 2ppm
SP:1 to 1000 ppm(v) resolution = 1ppm
MP:0.1 to 100.0 ppm(v) resolution = 0.1ppm
LP:0.01 to 10.00 ppm(v) resolution = 0.01ppm
PB:1 to 1000 ppb(v) resolution = 1ppb
HG:0.01 to 10.00 g/m3 resolution = 0.01g/m3
LG:0.001 to 1.000 g/m3 resolution = 0.001g/m3
LLB:0.1 to 10.0 lbs/MMSCF resolution 0.01 lbs/MMSCF
SLB:0.1 to 25.0 lbs/MMSCF resolution 0.01 lbs/MMSCF
HLB:0.1 to 50.0 lbs/MMSCF resolution 0.01 lbs/MMSCF
VHLB:0.1 to 300.0 lbs/MMSCF resolution 0.01 lbs/MMSCF

Model AMT Dewpoint Transmitter

4-20mA. Ranges available between -184°F to +68°F (-120°C to +20°C)

Model AMT Dewpoint Transmitter is a two wire 4-20mA loop powered transmitter, used for continuous measurement of moisture in dry process gases or dry 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.

  • Fast Response.
  • Low Cost Solution.
  • Simple to Install and set up.
  • Reliable.
  • Accurate.
  • Stable results

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 better than ±3.60F (±20C) dewpoint.

  • 2 Wire Loop Powered Dewpoint Transmitter.
  • Overall Range: -1840F to +680F Dewpoint.
  • Accuracy better than ± 3.60F Dewpoint.
  • INTEGRATED AUTOMATIC CALIBRATION.
  • Can be configured for linear 4-20mA signal in: 0F & 0C dewpoint, ppm(v), ppb(v), g/m3 & lb/MMSCF.
  • Temperature Compensation.
  • Failure Diagnostics.
  • Long Term Stability.
  • Fast Response Time.
  • NEMA4X (IP66) Protection

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 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 specific routine from the manual.

The integral RISC microprocessor circuitry of the Model AMT 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. 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 NEMA4X (IP66), with the transmitter electrical connections made via a secure industrial connector.

Model AMT transmitter can withstand 5,076PSIA (350barA) maximum pressure and by employing a low resistance cable, the transmitter can be located at significant distances, in excess of 3300 feet (1km), 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.

Note: The Model AMT is not suitable for Ammonia (NH3), Chlorine (CI) and Hydrogen Chloride (HCI). SF6 can be monitored with no effect to the sensor element. Sulphur Dioxide (SO2) can be monitored if the moisture content is low, less than 100ppm(v).

The Model AMT transmitter is supplied with a Certificate of Calibration, an instruction manual and 2m connecting cable.

Model AMT Dewpoint Transmitter

MODEL AMT Dewpoint Transmitter

4-20mA Loop Powered Transmitter

TRANSMITTER TYPE: 2 Wire, 4-20mA Loop Powered Transmitter

OUTPUT SIGNAL: 4 to 20mA Linear

OPERATING VOLTAGE: 7V – 28V dc. Reverse polarity protected.

MAXIMUM SERIES RESISTANCE: = {40 x (Supply Voltage – 7)} ohms

SENSING ELEMENT: Ultra High Capacitance – Aluminium Oxide Type

RANGES: See How to Order Below

AUTOCAL: Field calibration / Span check facility. Activated and operated via two button switches on the Transmitter body. Locked in normal operating mode to avoid tamper.

FACTORY CALIBRATION: Supplied with Certificate of Calibration traceable to NIST / NPL

ACCURACY: Better than ±3.6°F (±2°C) dewpoint (NIST / NPL traceable for range -130°F to +68°F)

TEMPERATURE COEFFICIENT: Temperature compensated for operating range.

REPEATABILITY: Better than ±0.54°F dewpoint

OPERATING TEMPERATURE: -4°F to +140°F (-20°C to +60°C)

STORAGE TEMPERATURE: -4°F to +158°F (-20°C to +70°C)

OPERATING PRESSURE: From 0.145PSIA (0.01 barA) to Maximum 5,076PSIA (350barA)

OPERATING HUMIDITY (External): Maximum – 95% RH Non-condensing

SAMPLE FLOW RATE: Flow independent but ideally 2 to 5 litres per minute. Max: 25 litres/min.

CABLE TERMINATIONS: NEMA4X (IP66) rated, size C, DIN EN 175301 connector at the Transmitter and other end terminated with bootlace ferrules.

CABLE: Supplied with 6.6 feet standard cable. Nominal diameter 0.13 inches (3.3mm), 92ohms/km at 68°F (20°C)

ELECTROMAGNETIC COMPATIBILITY (EMC): Complies BS EN 61326-1

WARM UP TIME: 10 seconds

FAULT CONDITIONS:
Open Circuit : Output drives to 20.50mA
Short Circuit : Output drives to 20.75mA

ISOLATION: Sensing Element connected to the 4-20mA loop but isolated from Transmitter body.

TRANSMITTER ENCLOSURE: 316 Stainless steel body with size C, DIN EN 175301 connector.

SENSOR PROTECTION: 316 Sintered stainless steel filter – 50 micron

PROBE MATERIAL (WETTED PARTS): 316 Stainless Steel

WEATHERPROOF CLASSIFICATION: NEMA4X (IP66) when connector mated to transmitter.

MECHANICAL CONNECTION: 3/4” UNF (16tpi) with integral Viton “O” ring seal.

MECHANICAL WARRANTY: 24 months in case of faulty workmanship and defective parts.

CALIBRATION WARRANTY: 12 months.

ACCESSORIES INCLUDED: Standard 2 meter connecting cable.

  • Dewpoint or Trace Moisture in Gases.
  • Dewpoint or Trace Moisture in Dry Compressed Air.
  • Fluid bed dryers
  • Refrigerant dryers
  • Desiccant wheel dryers
  • Rotary wheel dryers
  • Turbine air intakes
  • Wind tunnels
  • HVAC applications
  • Cool stores
  • Air braking systems
  • Condensation alarms
  • Controlled atmosphere environments
  • Precision engineering applications
  • Heat treatment gases
  • Environmental chambers
  • Product drying
  • Ambient air monitoring
  • Gas turbine frost protection systems
  • Switchgear monitoring

The AMT Transmitter can be paired with the Model DS1200 if a Display is required. Click here for more details.

Model AMT + [xxxx] (xxxx=Range Code)

Range CodeRange
RDF:-112°F to -4°F (-80°C to -20°C) dewpoint resolution 0.1°F / °C
SRF:-166°F to -4°F (-110°C to -20°C) dewpoint resolution 0.1°F / °C
GYF:-112°F to +32°F (-80°C to 0°C) dewpoint resolution 0.1°F / °C
PLF:-148°F to +32°F (-100°C to 0°C) dewpoint resolution 0.1°F / °C
BLF:-112°F to 68°F (-80°C to +20°C) dewpoint resolution 0.1°F / °C
SDF:-148°F to +68°F (-100°C to +20°C) dewpoint resolution 0.1°F / °C
SSRF:-184°F to +68°F (-120°C to +20°C) dewpoint resolution 0.1°F / °C
LDF:-184°F to +68°F (-120°C to +20°C) dewpoint resolution 0.1°F / °C
SHDF:-85°F to +32°F (-65°C to 0°C) dewpoint resolution 0.1°F / °C
HDF:-85°F to +68°F (-65°C to +20°C) dewpoint resolution 0.1°F / °C
RDC:-80°C to -20°C (-112°F to -4°F) dewpoint resolution 0.1°F / °C
SRC:-110°C to -20°C (-166°F to -4°F) dewpoint resolution 0.1°F / °C
GYC:-80°C to 0°C (-112°F to 32°F) dewpoint resolution 0.1°F / °C
PLC:-100°C to 0°C (-148°F to 32°F) dewpoint resolution 0.1°F / °C
BLC:-80°C to +20°C (-112°F to 68°F) dewpoint resolution 0.1°F / °C
SDC:-100°C to +20°C (-148°F to 68°F) dewpoint resolution 0.1°F / °C
SSRC:-120°C to -20°C (-184°F to -4°F) dewpoint resolution 0.1°F / °C
LDC:-120°C to +20°C (-184°F to 68°F) dewpoint resolution 0.1°F / °C
SHDC:-65°C to 0°C (-85°F to 32°F) dewpoint resolution 0.1°F / °C
HDC:-65°C to +20°C (-85°F to 68°F) dewpoint resolution 0.1°F / °C
GYP:1 to 6000 ppm(v) resolution = 2ppm
SP:1 to 1000 ppm(v) resolution = 1ppm
MP:0.1 to 100.0 ppm(v) resolution = 0.1ppm
LP:0.01 to 10.00 ppm(v) resolution = 0.01ppm
PB:1 to 1000 ppb(v) resolution = 1ppb
HG:0.01 to 10.00 g/m3 resolution = 0.01g/m3
LG:0.001 to 1.000 g/m3 resolution = 0.001g/m3
LLB:0.1 to 10.0 lbs/MMSCF resolution 0.01 lbs/MMSCF
SLB:0.1 to 25.0 lbs/MMSCF resolution 0.01 lbs/MMSCF
HLB:0.1 to 50.0 lbs/MMSCF resolution 0.01 lbs/MMSCF
VHLB:0.1 to 300.0 lbs/MMSCF resolution 0.01 lbs/MMSCF