EA2-TX

Supported Applications

The EA2-TX Series is the Easidew 2-wire dew-point transmitter from Michell Instruments, a compact loop-powered instrument for measuring moisture content in gases. Delivering its reading as a standard current signal, it installs directly into a process line or sample block and reports dryness continuously to a controller, PLC, or monitoring system.

It is well suited to natural gas, hydrogen, nitrogen, air, and inert gas systems, and to compressed-gas drying where product quality depends on low moisture. A choice of process connections and electrical connectors makes the EA2-TX straightforward to fit into new or existing sampling arrangements for reliable, long-term dew-point monitoring.

Operating Conditions & Performance

The transmitter measures dew point over -110 to +20°C (-166 to +68°F), with a companion range of -100 to +20°C (-148 to +68°F), resolving readings to 0.01 °C. It holds an accuracy of ±0.5 °C / ±0.9 °F with a repeatability of ±0.2 °C, and provides a typical T90 response of less than 10 seconds.

Output is a 4–20 mA loop signal with RS485 / Modbus RTU communications, powered from 10–30 VDC into a load of up to 500 Ω at 24 VDC, terminated through a DIN 43650 or M12 connector. The sensor withstands pressures up to 45 MPa (450 barg / 6500 psig), and its wetted parts use 316L stainless steel with an HMWPE guard.

The EA2-TX carries an IP67 enclosure and operates over a process range of -100 °C to +100 °C, an ambient range of -40 °C to +85 °C, and storage to -40 °C to +85 °C. The probe measures 12 mm in diameter with a 25 mm insertion length, a 50 mm stem, and a 100 mm overall length. Approvals include ATEX, IECEx, UL, CSA, and NEC.

Configuration Options

The EA2-TX is ordered as a configured transmitter, with a simplified alphanumeric code that fixes each feature to the application. The configurable axes are:

• Range — a -100 to +20°C or -110 to +20°C dew-point range, or a non-standard configured range in °C, °F, or ppmV.
• Protection — a standard HDPE guard against fine particulates, or a stainless-steel sintered guard.
• Oxygen cleaning — standard, or cleaned for oxygen service, which is offered only with the stainless-steel sintered guard.

The choices that most change the delivered instrument are the guard type and oxygen-cleaning selection, which together govern particulate protection and suitability for oxygen-enriched media, while the range option sets the span over which the transmitter is scaled.

Key Product Differences

Ordering follows the parent code and its three feature positions, EA2-TX - <Range> - <Protection> - <Oxygen Cleaning>. The lineup spans the letter combinations from EA2-TX-AAA through EA2-TX-BBB, for example:

• EA2-TX-ABB — Easidew 2-wire transmitter with the -100 to +20°C range, a stainless-steel sintered guard, and oxygen-cleaned wetted parts.
• EA2-TX-RAA — non-standard range built to customer specification with an HDPE guard and no oxygen cleaning; the range is specified at time of order.

Under the previous ordering system the same choices were written out longhand, for example EA2-TX+(-100/+20C)+HD for the base transmitter with the -100 to +20°C range and an HDPE guard. Across every configuration the core sensing platform is unchanged — the model number simply records the chosen range, guard, and oxygen-cleaning options.