GE XGF8681-21-OIM-34-0 Ultrasonic Mass Flow Transmitter

Product Description

XGF8681-21-OIM-34-0 is an explosion-proof flare gas ultrasonic mass flow transmitter of GE Panametrics DigitalFlow XGF868i series. OIM stands for Operator Interface Module. It adopts patented Correlation Transit-Time™ ultrasonic measurement technology with built-in gas molecular weight algorithm to measure real-time flare gas volumetric flow, mass flow, gas velocity and molecular weight. The compact flameproof enclosure is certified for Zone 1 hazardous areas. There are no moving mechanical parts inside, creating zero pressure loss. It features strong immunity to dirty gas and fluctuating gas composition, serving as the core instrument for flare emission environmental metering in petrochemical & oil/gas industries. This model integrates local HMI for on-site parameter configuration, data viewing and alarm diagnostics. Together with ultrasonic transducers, it forms a complete flare gas flow measurement system.

Key Specifications

1. Series: DigitalFlow XGF868i Explosion-Proof Flare Gas Ultrasonic Mass Flow Transmitter
2. Part Code: XGF8681-21-OIM-34-0, OIM = Operator Interface Module
3. Measurement Principle: Patented Correlation Transit-Time™ ultrasonic technique
4. Velocity Range: 0.03 ~ 120 m/s, turndown ratio 4000:1
5. Measured Variables: Mass flow, volumetric flow, gas velocity, average molecular weight, temperature
6. Beam Path: Single or dual path configuration
7. Enclosure: Flameproof, certified for Zone1 hazardous area, suitable for offshore & onshore installation
8. Analog I/O: Isolated 4–20mA input / output; Pt RTD temperature input (-100℃ ~ +350℃)
9. Communication: HART, optional fieldbus extension
10. Gas Media: Flare gas, sour gas, fuel gas, boil-off gas, mixed vent gas (H₂, CO₂, N₂, CO etc.)
11. Features: Zero pressure drop, no moving parts, minimal maintenance, suitable for continuous or intermittent venting

Application

• Flare gas emission metering for refineries, oil & gas production plants, chemical plants; environmental compliance monitoring and carbon emission accounting
• Power & coking plants: stack gas, coke oven gas and vent gas flow monitoring
• LNG facilities: BOG boil-off gas, fuel gas and sour gas measurement
• Offshore platforms, refineries and chemical parks for continuous / intermittent flare venting pipelines
• Process mass balance calculation, flare system health monitoring, environmental regulatory reporting
• Interface with DCS/SCADA systems to upload flow, temperature, molecular weight and fault alarms; local HMI for live data & alarm review

Family Related Models

• XGF868i: Compact explosion-proof flare gas ultrasonic mass transmitter (base model)
• GF868: Panel / wall mount flare gas ultrasonic meter (non-compact, Zone2 standard enclosure)
• XGM868i: General-purpose explosion-proof gas ultrasonic meter (non-flare dedicated)
• GM868: General-purpose gas ultrasonic meter (non-explosion proof)
• GC868: Clamp-on gas ultrasonic flowmeter (no pipe cutting required)