Atlas Copco EA2‑TX‑100 Dew Point Sensor (1089‑9481‑53)

The Atlas Copco EA2‑TX‑100, with part number 1089‑9481‑53, is a high‑precision dew point sensor designed for continuous monitoring of moisture levels in compressed air systems. This sensor covers a measurement range from -100 °C to +20 °C dew point (DP), making it suitable for applications requiring extremely dry air, such as pharmaceutical manufacturing, electronics production, and instrument air. The sensor is based on proven capacitive polymer technology, offering excellent long‑term stability, fast response, and resistance to contamination.

Measurement Technology

The sensor uses a thin‑film capacitive sensing element that absorbs water vapour molecules from the sample gas. The resulting change in capacitance is proportional to the water vapour pressure, which is then converted to dew point temperature. The sensor includes a built‑in temperature compensation algorithm to ensure accuracy across a wide ambient temperature range. The EA2‑TX‑100 is factory‑calibrated and maintains its accuracy over many years with minimal drift.

Performance Specifications

• Measurement Range: -100 °C to +20 °C dew point

• Accuracy: ±1 °C DP (in the range -60 to +20 °C), ±2 °C DP (below -60 °C)

• Response Time: < 10 seconds for 63% of step change

• Output Signal: 4‑20 mA (two‑wire) or 0‑10 V (selectable)

• Supply Voltage: 12‑28 VDC

• Operating Temperature: -40 °C to +60 °C

• Storage Temperature: -40 °C to +70 °C

• Pressure Rating: Up to 50 bar

• Process Connection: 1/2″ NPT or G 1/2″

• Material: Stainless steel (sensor) and anodized aluminum (housing)

• Protection: IP66 / NEMA 4X

Installation and Operation

The sensor is installed directly into the compressed air line using a standard threaded connection. A sampling system may be required for high‑pressure or very wet applications to prevent liquid water from contacting the sensor. The transmitter provides a linear 4‑20 mA output corresponding to the dew point range, which can be connected to a PLC, controller, or digital display. The sensor also includes a service port for configuration and calibration checks using a handheld device.

Calibration and Maintenance

The EA2‑TX‑100 is supplied with a factory calibration certificate traceable to international standards. Re‑calibration is recommended annually, which can be performed by Atlas Copco service centers or using a portable dew point generator. The sensor element is field‑replaceable, minimizing downtime. Regular inspection of the filter (if fitted) is advised to prevent particulate clogging.

Applications

Typical applications include: monitoring of desiccant and refrigerated dryers, quality control in pharmaceutical and food processing, semiconductor manufacturing, paint spraying operations, and environmental chambers. The sensor is also used in gas pipeline drying and laboratory instrument air systems.

Integration with Atlas Copco Systems

The sensor can be directly connected to Atlas Copco Elektronikon or other controller panels that accept a 4‑20 mA input. It can also be used with Atlas Copco’s SMARTLINK monitoring platform for centralized alarm and data logging.

Reliability and Durability

With a robust stainless steel construction and epoxy‑coated electronics, the sensor withstands harsh industrial conditions. The sensing element is resistant to oil and particulate contamination, reducing the need for frequent cleaning. MTBF is rated at over 50,000 hours.

Benefits for Air Quality Management

Accurate dew point measurement ensures that compressed air meets required specifications, preventing product spoilage, corrosion, and equipment malfunction. Early detection of dryer performance issues allows proactive maintenance, saving energy and reducing downtime.

Conclusion

The Atlas Copco EA2‑TX‑100 dew point sensor (1089‑9481‑53) provides reliable, accurate, and long‑lasting moisture measurement for demanding compressed air applications. Its wide range and robust design make it an essential tool for ensuring air quality and process integrity.