Gas flowmeters Turbo Flow UFG-F for metering the reverse and fluctuating gas flow rate

Purpose:

Ultrasonic gas flowmeters are intended for high-accuracy measurement (0.3%):

• Volumetric gas flow rate;

• Mass gas flow rate

in operating and standard conditions in pipelines DN 50...500 mm.

The electronic computing unit:

• Takes measurement of gas flow parameters: temperature, pressure.
• Makes computation of accumulated gas volume.
• Archives measured parameters.
• Optional: data transfer via mobile communication or Ethernet links.

Field of application:

• Automotive gas-filling compressor stations (AGFCS);
• Compressor stations;
• Bypass systems with reverse gas flow.

Specific features of flowmeter:

• High accuracy: 0.3...1%;
• Measurement range 1:200;
• Measurement of quick-changing and fluctuating gas flows;
• Metering of reverse gas flow;
• No moving parts;
• Produces no gas differential pressure;
• No sensitivity to vibration and acoustic noise.

Based on temperature range of ambient environment and medium measured:

• configuration М - from minus 30 to plus 70;

• configuration Х - from minus 50 to plus 70.

Based on components and performed functions:

• Configuration S0 includes an ultrasonic flow transducer, an electronic unit;
• Configuration S1T includes an ultrasonic flow transducer, electronic unit, temperature transducer, flow computer integrated in electronic unit;
• Configuration S1TR includes an ultrasonic flow transducer, electronic unit, temperature transducer, flow computer integrated in electronic unit, pressure transducer;
• Configuration S2ТR includes an ultrasonic flow transducer, electronic unit, temperature transducer, a flow computer remotely installed in a flow-measurement cabinet, pressure transducer;
• Configuration S3ТR includes an ultrasonic flow transducer, electronic unit, temperature transducer, pressure transducer, a Raskhod-1 flow computer;
• Configuration S4 includes an ultrasonic flow transducer, electronic unit, temperature transducer, pressure transducer, a Superflow-23 gas volume corrector.

Based on explosion protection:

• 1 Ex dib [ia Ga] IIC T4 Gb;
• 1 Ex d [ia Ga] IIC T4 Gb.

A special-purpose removable attachment allows performing the on-site "hot" swapping of ultrasonic sensors without pressurizing the main pipeline and without dismantling the flowmeter.

The technological equipment used at the compressor stations and automotive gas-filling compressor stations (AGFCS) has a number of transient processes resulting in fluctuating reverse gas flow rate in the piping during the period when the compressor is turned on and off. Commercial metering of gas consumption requires the accurate metering of the consumed gas volume, for which purpose the gas flow rate in the reverse direction shall be considered:

Flow conditioner

Device to replace
ultrasonic sensors RUS

Straight sections

Limits of permissible relative error when measuring volumetric flow rate and volume

of gas in operating conditions, for combination of pairs of transmitter/receiver

units within range of flow rates Qmin<Q< 0.01 Qmax:

- with 1 pair of transmitter/receiver units, %
- with 2 pairs of transmitter/receiver units, %
- with 4, 6, 8 pairs of transmitter/receiver units, %
- with 4, 6, 8 pairs of transmitter/receiver units (optional*), %

± 3.0 (±3.5*)
± 2.0 (±2.5*)
± 1.0 (±1.5*)
± 0.5 (±1.0*)

0.01 Qmax<Q< Qmax:

- with 1 pair of transmitter/receiver units, %
- with 2 pairs of transmitter/receiver units, %
- with 4, 6, 8 pairs of transmitter/receiver units, %
- with 4, 6, 8 pairs of transmitter/receiver units (optional*), %

± 1.5 (±2.0*)
± 1.0 (±1.5*)
± 1.0 (±1.5*)
± 0.3 (±0.5*)

protocol HART, protocol MODBUS RTU
via RS-232, RS-232 TTL и RS-485

GSM, GPRS, Bluetooth, IrDA (ИК-порт), Zig Bee, M2M 433/868 МГц

from external power unit: 7 to 30

30.0

from -30 to +70 

from -50 to +70

- relative air humidity, %,
- atmospheric pressure, kPa

Average mean time between failures, hours, at least