Aluminum oxide sensor dew-point transmitter AMT-20

DN20 - 3/4"3-wirecurrent output

Product description
The AMT-20 is a compact 3-wire dew point transmitter with a linear 4–20 mA output, Al2O3 sensor and stainless-steel housing for industrial environments. The intrinsically safe variant (AMT-20-Ex) offers an additional digital output and is certified Baseefa Ex 1 GD Ex ia IIC T4.

Analog signal output
The transmitter provides a linear 4–20 mA signal across the selected measuring range to integrate directly into process control and monitoring systems.

Alumina Sensor
The Al2O3 (alumina) sensor offers high capacity for fast response, good stability and accurate dew point measurement suitable for demanding process applications.

Technical overview
Parameters: Dewpoint °C
Method: Al2O3
Ranges: -120°C to +20°C; -100°C to +20°C; -60°C to +20°C
ATEX: Yes (Baseefa Ex 1 GD Ex ia IIC T4)
SIL: No
Accuracy: ±2 % FSD
Resolution: Analog proportional to measuring range
Flow rate: approx. 2–5 l/min
Max. pressure: 200 bar
Calibration: Dew Point Mirror
Response time T90: approx. 90 s (from -20°C to -60°C)
Output: 4–20 mA, 2-Wire (3-wire configuration available)
Supply voltage: 5–28 V
Display: optional
Protection class: IP65 (table) / IP66 / NEMA 4X (features)
Connection: ¾
Dimensions: 14 cm
Weight: 0.3 kg

Standard Features

• 3-wire intrinsically safe dew point transmitter
• Ex ia IIC T4 certification
• Overall range: -120°C to +20°C dew point
• Automatic calibration option
• Configurable linear 4–20 mA output in °C/°F dew point, ppm(v), g/m³, lb/MMSCF
• Temperature compensation
• Failure diagnostics
• Long-term stability
• Fast response
• IP66 / NEMA 4X protection

Application Areas

• Semiconductor industry
• Pharmaceutical production
• 3D printing processes
• Gas production and processing
• Glovebox and controlled-atmosphere applications
• Chemical industry

Technical specifications

• Model: AMT-20
• Measuring parameter: Dewpoint (°C)
• Sensor method: Al2O3 (alumina)
• Measuring ranges: -120°C … +20°C; -100°C … +20°C; -60°C … +20°C
• Output signal: 4–20 mA (linear to full range), 2-wire
• Digital output: available (AMT-20-Ex)
• Supply voltage: 5–28 V
• Accuracy: ±2 % FSD
• Response time T90: ≈90 s (-20°C to -60°C)
• Flow rate: ≈2–5 l/min
• Max. pressure: 200 bar
• Calibration: Dew Point Mirror
• Gas temperature range: -10 … +50 °C
• Display: optional
• Protection class: IP65 / IP66 / NEMA 4X
• Connection: ¾
• Dimensions: 14 cm
• Weight: 0.3 kg
• Ex certification: Baseefa Ex 1 GD Ex ia IIC T4