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, |
Specification
| Gases | Pipeline Quality Natural Gas, Air |
| Measurements | Volume Flow, Totalized Volume, Velocity of Gas, Speed of Sound, Swirl |
| Sizes | DN 80-600 / 3”, 4”, 6”, 8”, 10”, 12”, 16”, 20”, 24” (ANSI 600); Consult RMG for sizes > 24”. |
| Path Configuration | 6 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 Range | 1 bar (14.5 psi)….. 300 bar (4351psi) |
| Flanges | up 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 Humidity | up to 95% condensing |
| Measuring Interval | Typically 32 measurements/sec |
| Power supply | 24 V/DC +/- 10% |
| Power requirement | Typically 7 W |
| Hazardous Area Approvals | ATEX: 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 Approvals | MID, PTB, Measurement Canada |
| Conformities | AGA 9, ISO 17089, OIML 137-2012 |
| Electrical Safety | EMV, Environmental |
| Analog output | 0/4-20 mA (galvanically isolated, programmable, load resistor: max. 400 Ohm, Umax =16 V) |
| Frequency outputs | 2 HF-outputs with fmax = 5 kHz, Namur or Open Collector |
| Digital I/O | 2 X Programmable |
| Analog input for P&T | Galvanically isolated two-wire 4-20 mA p-transmitter or a 4-wire PT100 |
| Interfaces | |
| RS 485-0 | Service port with MODBUS-Protocol; RMGViewUSM (max. cable length: 500m / 1640ft);Ethernet via external module |
| RS 485-1 | Serial connection to RMG’s ERZ 2000-NG Flow Computer |
| RS 485-2 | MODBUS-protocol for interfacing with Third-Party Flow Computers, SCADA; Ethernet via external module |
| Transducer Frequency | 120 kHz/200 kHz for Sizes ≥ 8” (DN 200) |
| 200 kHz for Sizes ≤ 6” (DN 150) | |
| RMGViewUSM Diagnostics Software | Visualization, flow data, diagnostics, configuration, parameter changes, export/import of parameters and data |
| Protection | IP66 |
| Meter Body Material | Casted Steel; CS ASME A352 gr LCC |
| Material Electronics Housing Color/Finish | Aluminum cast Blue (RAL 5012) and metallic silver (RAL 9006) |
| Installation outside | With weather protection cover and sunroof |
| Remarks | Consult RMG for special requirements |