RMG USM GT400 Ultrasonic Gas Flow Meter

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Ultrasonic Gas Flow Meter | Inline GT400 RMG Ultrasonic Flow Meter

USM GT400 Gas Flow Meter

USM-GT-400 Ultrasonic Gas flow Meter is designated for measuring and calculation of the volume and flow rate of natural gas, petroleum gas, propane, butane, and other gases at operating conditions.

The operating principle of the meters is based on the measurement of the difference between the time of transmission of ultrasonic pulses along and against the gas flow. The time difference, as measured, proportionate to the flow speed is converted into the flow rate value.

Latest-generation ultrasonic gas meters provide for high-accuracy measurement of the gas flow. They can be applied at different locations where the gas is produced, transported, reprocessed, stored and consumed.

Device for Custody-transfer Metering

  • Suitable starting with absolute pressure pabs = 1 bar
  • High stability against turbulences thanks to 6 direct measuring paths, arranged as an X in 3 parallel plains
  • Tested according to TR G13/OIML
  • Air calibration with high-pressure test according to TR G7
  • High flow rates (up to 40 m/s) – that means smaller pipe sizes may be used
  • Exchange of sensors without recalibration
  • High measuring accuracy
  • Fully encapsulated, robust, dirt-repellent titanium sensors
  • Connection to RMG Flow Computer via RS485.
  • Operation / parametrization via the diagnosticsoftware RMGViewUSM.
Metrological approvals MID, PTB Ex approvals: ATEX (Exd), IECEx, CSA
Max. admissible pressure Pmax100 bar (higher pressure on request)
Max. flow rates Qmax from 1,000 m?/h to 108,000 m?/h
Nominal diameters DN 100 – DN 600 as standard (other nominal diameters on request)
Measuring range max. 1: 130
Flange connections PN 10, PN 16, ANSI 150, ANSI 300,


GasesPipeline Quality Natural Gas, Air
MeasurementsVolume Flow, Totalized Volume, Velocity of Gas, Speed of Sound, Swirl
SizesDN 80-600 / 3”, 4”, 6”, 8”, 10”, 12”, 16”, 20”, 24” (ANSI 600); Consult RMG for sizes > 24”.
Path Configuration6 Direct Cross (“X’) Path; 3 Planes
Measurement uncertainty (from Qt to Qmax)
Dry calibration with Nitrogen acc. AGA 9+/-0.5%
HP-flow calibration. Full measuring range (Qtto Qmax).+/-0.1%
Repeatability+/- 0.1%
Operating Pressure Range1 bar (14.5 psi)….. 300 bar (4351psi)
Flangesup to ANSI600; Consult RMG for higher design pressure
Ambient Temperature-40°C (-40°F) to +55°C (131°F)
Gas Temperature Range-40°C (-40°F) to +80°C (176°F)
Operating Relative Humidityup to 95% condensing
Measuring IntervalTypically 32 measurements/sec
Power supply24 V/DC +/- 10%
Power requirementTypically 7 W
Hazardous Area ApprovalsATEX: Ex II 2G Ex de IIB + H2 T6; IECEx: Ex de IIB + H2 T6 Gb CSA, FM: Class I, Div 1, Groups B, C, D T6
Metrology ApprovalsMID, PTB, Measurement Canada
ConformitiesAGA 9, ISO 17089, OIML 137-2012
Electrical SafetyEMV, Environmental
Analog output0/4-20 mA (galvanically isolated, programmable, load resistor: max. 400 Ohm, Umax =16 V)
Frequency outputs2 HF-outputs with fmax = 5 kHz, Namur or Open Collector
Digital I/O2 X Programmable
Analog input for P&TGalvanically isolated two-wire 4-20 mA p-transmitter or a 4-wire PT100
RS 485-0Service port with MODBUS-Protocol; RMGViewUSM (max. cable length: 500m / 1640ft);Ethernet via external module
RS 485-1Serial connection to RMG’s ERZ 2000-NG Flow Computer
RS 485-2MODBUS-protocol for interfacing with Third-Party Flow Computers, SCADA; Ethernet via external module
Transducer Frequency120 kHz/200 kHz for Sizes ≥ 8” (DN 200)
200 kHz for Sizes ≤ 6” (DN 150)
RMGViewUSM Diagnostics SoftwareVisualization, flow data, diagnostics, configuration, parameter changes, export/import of parameters and data
Meter Body MaterialCasted Steel; CS ASME A352 gr LCC
Material Electronics Housing Color/FinishAluminum cast Blue (RAL 5012) and metallic silver (RAL 9006)
Installation outsideWith weather protection cover and sunroof
RemarksConsult RMG for special requirements

More Information: Brochure USM GT400

  Another Article:The Technology of Ultrasonic FlowmeterWorking Principle of Flow MeterHow to Choose a Flow MeterModels and Types of Flow MeterSound Velocity of MaterialPrinciple Working of Coriolis Mass Flow Meter

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