Field Instruments

Product Overview

The DigitalFlow XGF868i is a high-performance ultrasonic flowmeter designed for accurate measurement of flare gas, vent gas, biogas, hydrocarbon gases or digester gases in industrial, petrochemical, and waste-management applications. It provides reliable measurements of velocity, volumetric flow, mass flow, and even instantaneous average molecular weight — making it ideal for gas flow monitoring, leak detection, emissions control, and process optimization. Built for harsh and hazardous environments, the XGF868i offers explosion-proof, robust construction with minimal maintenance needs and wide operational flexibility.

Key Features

• Measures velocity, volumetric flow, and mass flow independently of gas composition
• Calculates instantaneous average molecular weight, enabling accurate mass flow and energy content estimation
• Supports very high velocity range (up to 120 m/s / 394 ft/s) and very low flow — excellent turndown (≈ 4000:1)
• Works with one-path or dual-path (two-channel) configurations for improved accuracy or redundancy
• No moving parts, no pressure drop, and tolerant to dirty or wet gas conditions — minimal maintenance
• Explosion-proof / flame-proof transmitter housing — suitable for hazardous and offshore environments
• Compatible with a wide range of pipe sizes — from small to large industrial lines

Technical Specifications

Brand: Baker Hughes / Panametrics
Model: DigitalFlow XGF868i
Type: Ultrasonic gas flowmeter (flare/vent/industrial gases)

Fluid Types: Flare gas, vent gas, hydrocarbon gases, biogases, digester gases
Measurement Outputs: Velocity, volumetric flow, mass flow, molecular weight (for gas mixtures), net heating value (optional)
Flow Velocity Range: 0.03 – 120 m/s (0.1 – 394 ft/s)
Turn-Down Ratio: Approx. 4000:1 (wide dynamic range)
Pipe Diameter Range: ~100 mm to 3000 mm (4 in to 120 in) — depending on transducer/path configuration
Measurement Principle: Ultrasonic Correlation Transit-Time method
Construction: Explosion-proof / flame-proof transmitter; rugged, maintenance-free transducers; no moving parts
Installation: One- or two-path transducer configuration; direct pipe insertion or flow-cell / hot/cold tapping possible
Outputs & Communication: Analog 0/4–20 mA outputs (standard), optional digital/serial or bus communications (depending on configuration)
Environment / Gas Conditions: Suitable for dirty, wet, or hydrocarbon-laden gases; works regardless of gas composition

Applications & Use Cases

• Flare gas flow measurement / flare stack monitoring in refineries and petrochemical plants
• Vent gas, waste-gas or off-gas monitoring in processing, chemical, oil & gas, or waste-treatment facilities
• Leak detection and emission control — detecting unexpected gas flow or changes in molecular weight to identify leaks or process upsets
• Energy content (heating value) measurement and control for vent gases — optimizing combustion or flare efficiency
• Mass balance, throughput accounting, and process optimization in plants handling variable gas streams
• Harsh environment and hazardous area applications (e.g. offshore, chemical, petrochemical, industrial)

Why Use DigitalFlow XGF868i in Your Projects

• Combines mass flow, volumetric flow, and gas composition measurement — reduces need for multiple instruments
• Wide flow range and broad pipe-size applicability — one meter fits many pipeline configurations
• Ultrasonic, no-moving-parts design ensures low maintenance and high reliability, even with dirty or wet gases
• Explosion-proof and industrial-grade — safe for hazardous environments common in oil, gas, and chemical plants
• Accurate, fast-response measurements — ideal for leak detection, process control, emissions monitoring, and energy optimization

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