Alpha Moisture - Model AMT-Ex -Intrinsically Safe 4-20 mA Dewpoint Transmitter for Hazardous Applications

The unique Automatic Calibration (AutoCal) feature is standard on all AMT-Ex Transmitter models and allows the user to conduct field calibrations and span checks to ensure optimum accuracy between laboratory calibrations. AutoCal is operated using two small buttons on the side of the body. The buttons are locked in everyday use to avoid tampering and can only be activated by following a specific routine.

The integral RISC microprocessor circuitry of the AMT-Ex Transmitter allows high resolution with advanced self-diagnostics. It also enables annual laboratory re-calibration of the moisture sensor, storing calibration data onboard the fully self-contained unit.

Model AMT-Ex is designed to withstand a maximum pressure of 35,000 kPa (350 bar) and extreme environmental conditions. The rugged stainless steel construction provides protection to IP66 / NEMA 4X, with the transmitter’s electrical connections made via a secure industrial connector.

The transmitter is extremely easy to install and operate, requiring little or no maintenance; the optional Sensor Holder/Sample Cell is highly recommended for optimum sampling and allows easy removal for annual laboratory calibration without interrupting the process.

Model AMT-Ex Dewpoint Transmitter can be supplied with a DS1200 or DS4000 Hygrometer or separately for integration into your control system. Due to the low resistance cable, the transmitter can be located more than 1,000 m from the control room. Alpha Moisture Systems also manufacture Standard and Custom Dewpoint Sampling Systems for non-hazardous and hazardous applications.

Model AMT-Ex Dewpoint Transmitter from Alpha Moisture Systems embodies over 30 years of dedication to moisture measurement excellence, delighting our customers in almost every country. For pricing and delivery do not hesitate to contact us today.

• Certified Intrinsically Safe to IECEx, ATEX for use in hazardous areas and with potentially explosive atmospheres using a specified Signal Isolator in the safe area
• Ultra-high capacitance aluminium oxide sensor delivers unsurpassed sensitivity, speed of response, accuracy, repeatability, stability, and long service life
• Unique AutoCal span correction feature
• Various dewpoint ranges available from -110 °C to 20 °C
• Compact 3-Wire 4-20 mA Intrinsically Safe Dewpoint Transmitter
• Accuracy ±2 °C dewpoint
• IP66 / NEMA 4 Weatherproof Protection
• Optional Sensor Holder/Sample Cell for optimum sampling conditions
• Supplied with a calibration certificate traceable to National and International Humidity standards

• Transmitter Type: 3-Wire 4-20 mA Intrinsically Safe  Dewpoint Transmitter
• Sensing Element: Ultra-High Capacitance – Aluminium Oxide Type
• Output Signal: Linear 4-20 mA with selectable engineering units and fault indication
• Power Supply: 12-28 Vdc Reverse Polarity Protected
• Dewpoint Ranges: See datasheet
• Intrinsic Safety Certification: IECEx BAS07.0080 BASEEFA 07ATEX0234 BAS21UKEX0805
• Standards: EN 60079-0:2018 EN 60079-11:2012
• ATEX, UKCA and IECEx Markings: Ex II 1GD Ex ia IIC T4Ga Exia IIIC T200 135 °CDA (-20 °C ≤ Ta ≤ +60 °C)
• Electromagnetic Compatibility (EMC): Complies with BS EN IEC 61326-1
• Accuracy: ± 2 °C dewpoint (UK National Physical Laboratory traceable for range -90 °C to 20 °C)
• Repeatability: Better than ±0.3 °C dewpoint
• Operating Temperature (Ambient and Process): -20 °C to 60 °C
• Operating Pressure (Process): From 1 kPa (0.01 bara) to Maximum 35,000 kPa (350 bara)
• Operating Humidity (Ambient): Maximum 95 %RH Non-condensing
• Storage Temperature: -20 °C to 70 °C
• Field Calibration: AutoCal span check and correction are performed using two buttons on the Transmitter body. Locked in normal operating mode to avoid tamper. We recommend AutoCal is repeated every 2-3 months
• Factory Calibration: Supplied with a calibration certificate traceable to National and International Humidity standards. We recommend annual laboratory calibration
• Sample Flow Rate: Flow independent, ideally 5 to 15 L/min, maximum 20 L/min
• Cable Terminations: IP66 / NEMA 4X rated, size C, DIN EN 175301 connector at the Transmitter and other end terminated with bootlace ferrules
• Cable: Supplied with 2 m IS (blue) standard cable. Nominal diameter 3.4 mm, 92 ohms/km at 20°C
• Mechanical Connection: 3/4” UNF (16tpi) with integral Viton “O” ring seal
• Isolation: Sensing Element connected to the 4-20 mA loop but isolated from Transmitter body
• Transmitter Body: 316 Stainless Steel
• Sensor Protection: 316 Sintered Stainless Steel Filter – 50 micron
• Probe Material (Wetted Parts): 316 Stainless Steel
• Ingress Protection: IP66 / NEMA 4X when Connector coupled to Transmitter
• Manufacturer’s Warranty: 12 months in case of defective parts or faulty workmanship

• Calibration Certificate traceable to National and International Humidity standards
• 2 m Connecting Cable