Flare Gas Meter

Field computer & ultrasonic transducers

The Fluenta FGM 160 has been developed to measure flare gas in pipes where pressure, a wide range of velocity and large pipe diameters represent a challenge. Fluenta offers world-class flare gas meters characterized by:

Optimized signal processing and acoustic sensors enabling flow measurement up to 100 m/s
Automatic Gain Control (AGC) for enhanced performance
Digital Signal Processing (DSP)
Software based user interface (Operator Console)
Easy and fast to install
Field mounted flow computer
Low maintenance costs
Serial interface based on Modbus protocol

Advantages

Widest velocity range on the market
Wetted non intrusive sensor design for all pipe sizes
High measurement accuracy throughout entire range
Unique signal processing ensures high accuracy at low flow rate
Fast response time
Certified for operation in hazardous areas
No calibration required after installation
Rapid installation gives reduced costs
Low maintenance
High reliability

Application

Measurement of flare and vent gas, characterized by a large velocity range, low pressure and large pipe diameters
Flare gas density calculation for gas composition indications
Leak detection and loss calculation for mass balance in process plants
Accurate measurement of very low flow rates in flare and vent systems.

Installation

Fluenta’s FGM 160 has specially designed jigs for fast, economical and accurate mounting of transducer holders. These holders are welded onto the pipeline at an angle suitable for each different pipe size. The meter can either be delivered as a hot/cold tap version or with a prefabricated spool piece.

Operating principle

The Fluenta FGM 160 measures gas velocity based on the time–of–flight technique. The ultrasonic transducers are mounted at an angle to the pipe. Both transducers transmit and receive pulses and the transit time is measured. When the gas is flowing in the pipe, the pulses travelling against the flow take longer to reach the opposite transducer than the pulse travelling with the flow. This time difference is used to calculate the velocity of the flowing medium.

Specifications

Field Computer

Power input:	+24 VDC (18 – 36 VDC or 110 – 240 VAC 50/60 Hz, safe area power supply optional)
Consumption:	12 W maximum
Power / instrument cable :	Standard twisted pair: RFOU(i)2-3 x 2 x 0.75mm2
Dimensions:	460 x 280 x 250mm (H x W x D)
Weight:	17 kg
Input signals:	Signal from transducers via std instrument cable
Temperature & Pressure:	4-20 mA or HART interface
Output:	3 x 4-20 mA analog output channels, with selectable parameters. RS 422/485 Serial Port based on Modbus protocol
Optional output:	Additional 3 x 4-20 mA channels HART Pulse/frequency signal
Electrical classification:	Explosion proof Ex de (ia) II C T5-T6 Ex d optional Integrated Barriers
Ingressive Protection:	IP 66

System performance and characteristics

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Ultrasonic Transducers

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Operator Console