Name: GF868-1-2-1-2-1-B-1-4-0-0-0 DigitalFlow GF868 Two-Path Ultrasonic Flare Gas Flow Transmitter - MASSIVE
Brand: General Electric

Description

GF868-1-2-1-2-1-B-1-4-0-0-0 DigitalFlow GF868 Two-Path Ultrasonic Flare Gas Flow Transmitter

Product Application

GF868 is a high-performance ultrasonic gas flowmeter dedicated for flare gas measurement. It uses transit-time ultrasonic technology to calculate gas velocity, volumetric flow and mass flow, automatically compensating for gas temperature, pressure and molecular weight. This configured model is a two-path meter, improving accuracy for distorted flow profiles on flare lines. It outputs flow data to DCS, PLC or flow computer via analog or digital communication, for environmental emission reporting, flare control and mass balance. Common sites: refinery flare stacks, chemical plant vent lines, combined cycle power plant flare gas monitoring. It can communicate with GE Mark VI/VIe, RX3i, VersaMax and third-party control systems.

Product Specifications

Part Number: GF868-1-2-1-2-1-B-1-4-0-0-0
Manufacturer: Panametrics (Baker Hughes, formerly GE)
Product Type: DigitalFlow GF868 Ultrasonic Gas Flowmeter (Flare Gas)
Measurement Principle: Transit-time ultrasonic, bidirectional velocity measurement
Path Configuration: 2-path (per model code)
Velocity Range: 0.03 ~120 m/s, bidirectional
Turndown ratio: up to 100:1
Power Supply: 18–30VDC (24VDC nominal)
Analog I/O: 1 × 4–20mA analog output; 2 × 4–20mA analog inputs (for pressure/temp)
Digital Output: 4 digital relay/pulse outputs
Communication: Modbus RTU, Modbus TCP, HART (option)
Display: Backlit LCD + membrane keypad for local configuration & diagnosis
Enclosure: Epoxy coated aluminum, Type 4X / IP66
Hazardous certification: ATEX / IECEx / FM Class I Div.2
Operating Ambient Temp: -20 ℃ ~ +55 ℃ (electronics)
Process Medium Temp: -70 ℃ ~ +150 ℃ (standard T5 transducers, high-temp optional)
Process Pressure: Vacuum up to 105 bar
Accuracy: ±1.0% of reading for gas velocity; mass flow accuracy depends on gas composition
Repeatability: ±0.5%
Weight (Electronics Console): ~5 kg
Product Status: Mature active product, spare parts & calibration service available
Approx. Weight: 5.0 kg (electronics housing only, exclude flowcell & transducers)

GF868-1-2-1-2-1-B-1-4-0-0-0

Core Technical Parameters

Two ultrasonic paths to average flow profile, reduce error caused by swirl / asymmetric flow in flare pipes
Onboard gas property calculation: computes sound speed, molecular weight, standard volume and mass flow
Isolated analog inputs for pressure and temperature transmitters; built-in 24V loop power for field transmitters
Relay outputs configurable for high/low flow alarm, transducer fault, system diagnostic alarm
Non-intrusive ultrasonic transducers, no moving parts, low maintenance
PanaView PC software for remote configuration, data logging, waveform diagnostics and calibration
Supports bidirectional flow measurement for reverse flow conditions on flare lines

Recommended Matching Spare Parts & Accessories (8 Items)

GF868 ultrasonic transducers (T5 type)
RG62AU coaxial transducer cables
Pressure & temperature 4-20mA transmitters
24VDC redundant power supply
PanaView configuration software
Transducer sealing kits and gaskets
Surge protection for field cables
Modbus TCP gateway for DCS interface

Product Features

✅ Two-Path Flare Gas Measurement Dual ultrasonic paths average flow profile, greatly improve accuracy for flare lines with poor flow conditions.

✅ Transit-Time Ultrasonic, No Moving Parts Non-intrusive installation, no pressure drop, minimal maintenance for flare stack service.

✅ Integrated Mass Flow Calculation Uses measured P, T and gas composition to compute standard volume and mass flow for emission compliance reporting.

✅ Multiple I/O & Communication Options 4–20mA, relay alarm outputs, Modbus TCP/RTU and HART to connect to PLC/DCS (IC695ETM001, IS200 series etc).

✅ Type4X / IP66 Weatherproof Enclosure Suitable for outdoor installation at flare stack area, with explosion hazard approvals.

✅ Built-in Diagnostics Continuous transducer signal quality monitoring; alarms for signal loss, transducer degradation or out-of-range flow.

✅ Bidirectional flow capability Can detect reverse gas flow, common in flare header network.

Installation Guidelines

Select straight pipe section upstream/downstream per GF868 manual to minimize flow swirl.
Mount flowcell and install T5 ultrasonic transducers, route RG62AU coaxial cables to electronics console.
Mount GF868 electronics console in suitable shelter or outdoor weatherproof location.
Wire 24VDC power, pressure/temp 4-20mA transmitters, analog output and alarm relays.
Connect communication wiring (Modbus RTU/TCP) to DCS/PLC.
Power up meter, configure pipe dimensions, gas composition, units and I/O assignments via local keypad or PanaView.
Perform transducer signal quality test and zero/span calibration.
Verify flow, temperature, pressure and alarm signal transmission to control system before commissioning.

GF868-1-2-1-2-1-B-1-4-0-0-0

Maintenance Instructions

Daily Maintenance Check LCD for meter health, signal quality and flow status; monitor flow alarms in DCS.

Periodic Maintenance (Every 6–12 months) Inspect transducer cables for damage; check transducer seals; verify signal amplitude; backup meter configuration.

Fault Maintenance

Low signal quality: Check transducer face for coating/contamination, inspect cable integrity and grounding.
No flow reading: Verify transducer wiring, P/T transmitter signals and meter configuration.
Communication loss: Check Modbus address, cable shielding and network termination.
Do not modify gas composition database without process / metering engineer approval, affects mass flow calculation.

Long-Term Operation Tips Keep electronics enclosure temperature -20~+55℃. Backup meter site configuration file. Schedule periodic prover validation per local emission regulation.