GE MMY30-R2B2G

Product Brief: Industrial-grade, microprocessor-based dew point transmitter designed for continuous online measurement of moisture in gases. Utilizes a thin-film aluminum oxide (Al₂O₃) capacitive sensor. Loop-powered (2-wire) with 4–20 mA output proportional to dew point temperature or ppmv. Option code R2B2G typically denotes specific housing/config (R2 = ½″ NPT process connection / sampling arrangement; B2 = display & keypad; G = general purpose / metric units — verify against official option table).

Category: GE

Description

Working Principle: The aluminum oxide sensor acts as a capacitor; the adsorbed water vapor changes the dielectric constant proportionally to the partial pressure of water; the electronics measure capacitance and compute dew point / ppmv using stored calibration curves; result is converted to 4–20 mA analog signal.

Sensor Type: Planar aluminum oxide (Al₂O₃) thin-film capacitive sensor

Measured Parameters: Dew Point Temperature –90 °C to +10 °C Td; also ppmv (0–10 / 0–100 / 0–1000 ppmv) selectable via display

Calibration Accuracy: ±2 °C Td @ 25 °C (typical)

Recommended Recalibration Interval: 12 months (application-dependent)

Output Signal: 4–20 mA, 2-wire loop powered, 16 µA resolution; loop burden ≤ 500 Ω @ 24 VDC

Supply Voltage: 12 V DC – 30 V DC (nominal 24 V DC)

Display / Keypad (B2 option): 4-digit LCD with bar graph; 4 pushbuttons for unit selection, range adjustment, calibration check

Process Connection (R2 typical): ½″ MNPT or G½″ (DIN ISO 228) stainless steel sampling union; integral 2 µm sintered stainless steel filter & flow restrictor

Sampling Flow Rate (built-in): ≈ 28 sl/h (1 SCFH) @ 7 bar (100 psig)

Max Process Pressure: 31 bar (450 psig) @ 20 °C

Sensor Operating Temp (Process Gas): –40 °C to +50 °C

Electronics Operating Temp: –40 °C to +85 °C

Enclosure Rating: IP67 / NEMA 4X (aluminum or polycarbonate depending on variant)

Weight: ≈ 2 kg

Hazardous Area Certification (typical): FM IS Class I, II, III Div 1 Groups A–G T5; ATEX II 3G Ex nA IIC T4 (verify cert on nameplate)

Applicable Industries: Natural gas dehydration & pipeline quality control, compressed air dryers, semiconductor specialty gas, petrochemical process gas drying, power plant hydrogen cooling system moisture monitoring, pharmaceutical inert gas blanketing

Installation Requirements: Mount probe vertically or horizontally with process fitting tightened; connect 2-wire loop observing polarity; for sampled gas install with recommended flow (typically 0.5–1.0 NL/min); allow 15–30 min stabilization after power-up in dry gas.

Usage Notes: Do NOT expose sensor to liquid water or condensing conditions beyond spec — this can permanently damage the Al₂O₃ element; perform zero-check / span verification annually or per plant PM schedule using MMY245 calibrator or certified dew point reference; if output reads < 3.6 mA investigate sensor fault or open-loop condition.

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