MICHELL EA2-TX-100

Product Introduction:​ The Michell EA2-TX-100 is an industrial dew-point (or moisture in gas) transmitter designed for continuous online measurement of trace moisture in compressed air, dry gases, and process gases. It uses Michell’s ceramic moisture sensor (advanced metal-oxide semiconductor) offering fast response, high accuracy, and resistance to contamination. Output is a 4–20 mA loop signal proportional to dew point or ppmV moisture content.

Category:
Description
Technical Specifications & Performance Parameters:
  • Measurand:​ Dew point temperature (°C or °F) or moisture content in ppmV
  • Dew Point Range:​ -100 °C to +20 °C dp (standard); -110 °C to +20 °C dp available on special order
  • Accuracy (Dew Point):​ ±2 °C dp (typical across most of range)
  • Repeatability:​ ±0.5 °C dp
  • Response Time (T95, dry→wet):​ < 5 minutes (sensor recovery from wet condition is slower — hours)
  • Sensor Type:​ Michell advanced ceramic metal-oxide moisture sensor (interchangeable, factory-calibrated)
  • Output Signal:​ 4–20 mA (2-wire, loop-powered), fully user-configurable span (dew point or ppmV)
  • Supply Voltage:​ 12 – 28 V DC (loop-powered)
  • Loop Load Resistance:​ Max. 250 Ω @ 12 V DC; Max. 500 Ω @ 24 V DC
  • Current Consumption:​ ≤ 20 mA (including sensor)
  • Fault Indication:​ Sensor fault = 23 mA; Below range = 4 mA (adjustable); Above range = 20 mA
  • Calibration:​ Traceable 7-point certificate; recalibration interval typically 12–24 months depending on application
Material & Structural Features:
  • Housing:​ 316 stainless steel, weatherproof
  • Process Connection:​ 5/8″ – 18 UNF (male) with O-ring seal; optional compression fitting or swagelok adaptor
  • Sensor Protection:​ Removable HDPE protective cap (< 10 μm pore size); optional 80 μm sintered stainless steel cap for dusty service
  • Electrical Connection:​ Hirschmann GDS (DIN 4350-C) or M12 4-pin (model-dependent)
  • Dimensions:​ Length ≈ 132 mm × Ø 27 mm (body); with connector ≈ 150 mm overall
  • Weight:​ ≈ 150 g
  • Ingress Protection:​ IP66 / NEMA 4X
Operating Conditions & Installation Requirements:
  • Operating Temp. (Electronics):​ -40 °C to +60 °C
  • Sensor Temp. Compensation Range:​ -20 °C to +50 °C (accuracy specified within this band)
  • Max. Process Pressure:​ 45 MPa (450 bar g) — verify with optional pressure-rated housing if > 1 MPa
  • Flow Rate (if sampled):​ 1 – 5 Nl/min when installed in sampling cell; direct insertion acceptable in flowing gas 0–10 m/s
  • Mounting:​ Direct insertion into pipe/duct with appropriate ball valve isolation, or in bypass sample system with filter/regulator
Application Scenarios:​ Compressed air dryers (ISO 8573-1Class 1–6), heat treatment/annealing furnace atmosphere, glove boxes, hydrogen-cooled generators, SF₆ gas insulated switchgear, nitrogen/oxygen generator monitoring, pharmaceutical drying processes.
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