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SI-3404 Ultrasonic Gas Flow Meter

Ultrasonic gas flow meter is based on the transit-time measurement principle. It features built-in digital temperature and pressure transmitters, integrated wireless communication module, and combines flow measurement, volume correction, and remote data transmission in one velocity-type gas metering instrument. Key advantages include high measurement accuracy, excellent reliability, low pressure loss, and wide turndown ratio. It meets the high-precision metering requirements of the city gas industry and is widely used in city gas, chemical, power, metallurgy, and trade custody transfer applications.

SI-3404 Ultrasonic Gas Flow Meter
MediumGAS, Natural Gas
LPG gas, natural gas, Oxygen, nitrogen, air etc.
DiameterDN25-DN300
Accuracy1.4% , Repeatability: 0.4%

1.0% , Repeatability: 0.2%

OutputPulse / RS485
Pressure1.6Mpa, 2.5MPa, 4.0MPa, 16MPa, 40MPa
ProtectionIP 65

Features

Ultrasonic gas flowmeter has no moving parts and includes self-diagnostic functions, helping reduce maintenance workload, lower supply-demand discrepancies, and improve lean management. The accompanying PC software enables comprehensive data collection, diagnostics, and parameter configuration with role-based access control.

  • Multi-path design — Proprietary dual-path (2 or 3 path) oblique-reflection acoustic channel design, effectively compensating for swirl and asymmetric flow profiles
  • High accuracy — Measurement accuracy up to 1%
  • Wide turndown ratio — Effective turndown ratio up to 1:160
  • Low transition flow — Transition flow Qt as low as 10Qmin
  • Low start-up flow — DN50 start-up flow as low as 0.2 m³/h
  • Low pressure loss — DN50 maximum pressure loss as low as 0.40 kPa
  • Integrated design — Built-in temperature and pressure sensing with integrated T&P volume correction
  • Built-in transmitters — Digital temperature and pressure transmitters built into the meter body, preventing accidental damage
  • 360° rotatable display — Display head rotates freely up to 350°
  • Lithium battery option — Optional lithium battery pack or external power supply
  • No moving parts — Virtually maintenance-free
  • Wireless capability — Integrated wireless data transmission with self-diagnostics and online monitoring
  • Easy installation — Built-in flow conditioner for simple installation
SI-3404 Ultrasonic Gas Flow Meter

Specifications

ParameterSpecification
Measuring PrincipleUltrasonic transit-time
Acoustic PathsDual-path (DN25/32/40/50/80/100), Triple-path (DN150/200)
Accuracy1%, Qt = 10Qmin
Medium Temperature-25°C to +60°C
Ambient Temperature-30°C to +60°C
Pressure RatingPN16
Explosion ProtectionFlameproof: Ex d IIB T6 Gb; Intrinsically safe: Ex ib IIB T4 Gb
Ingress ProtectionIP65
Measured ValuesWorking flow, working accumulated volume, standard flow, standard accumulated volume, temperature, pressure
Measured MediaNatural gas, air, nitrogen, and other non-corrosive gases
Output SignalsStandard pulse: 0–3.2 kHz (OC output, N.O., ext. power required); Low-frequency pulse: 0.1/1/10 m³/p selectable (OC, N.O., N.C.); Analog: 1-ch 4–20 mA two-wire (optional); Low battery/under-pressure alarm: OC output, N.O., N.C.
CommunicationRS485, Bluetooth, Wireless (GPRS, NB-IoT, or 4G)
DisplayLCD
InstallationFlange connection (GB/T 9113 standard)
Body MaterialCast aluminum
Power SupplyExternal: +10V to +24 VDC; or Internal: +7.2 VDC lithium battery (metering battery + communication battery)

Flow Range

ModelDN (mm)Flow Range (m³/h)Transition Flow Qt (m³/h)Start-up Flow (m³/h)Turndown RatioMax Pressure (MPa)Accuracy
DN2525~4050.10.097222222≤1.61% (Qt=10Qmin)
DN32320.5–6550.10.131944444≤1.61%
DN40401.0–100100.20.111111111≤1.61%
DN50501.0–160100.20.152777778≤1.61%
DN80802.5–400250.50.152777778≤1.61%
DN1001004.0–650400.80.152777778≤1.61%
DN15015016–16001603.20.111111111≤1.61%
DN20020025–250025050.111111111≤1.61%

Built-in Pressure Transmitter Specifications

ParameterSpecification
TypeDigital, absolute pressure
Range0–0.5 MPa (SZ-P-05) / 0–1.0 MPa (SZ-P-10) / 0–1.6 MPa (SZ-P-16)
Accuracy≤ ±2.5‰ FS

Built-in Temperature Transmitter Specifications

ParameterSpecification
Sensor TypePT100
Range-25°C to +60°C
Accuracy≤ ±0.5°C

RS485 Communication Parameters

ParameterSpecification
ProtocolStandard MODBUS/RTU
Baud Rate1200 bps – 115200 bps (configurable)
Slave Address0–255

Mobile APP Functions

Online Monitoring System

Order Guide

In addition to regular products, we support customization

Model code: SI-3121 – ☐ – ☐ – ☐ – ☐ – ☐ – ☐ – ☐

PositionCodeDescription
Pipe Size025DN25
032DN32
040DN40
050DN50
080DN80
100DN100
150DN150
200DN200
Explosion ProtectioniIntrinsically safe
dFlameproof
Working Pressure00No pressure transmitter
050.5 MPa
101.0 MPa
161.6 MPa
MediumAAir, nitrogen, etc.
GNatural gas
WirelessGGPRS
NNB-IoT
H4G
ZNone
OptionalIAnalog output (4-20mA)
ZNone
Measurement DirectionUUnidirectional
BBidirectional

Order example: SI-3121-i-080-10-G-G(E)-Z-U = Intrinsically safe, DN80, 1.0 MPa, natural gas, GPRS (external antenna), no analog output, unidirectional.

Notes: Antenna is built-in by default; add “(E)” after wireless code for external antenna. For units without pressure transmitter, the pressure value is user-specified at factory.

Applications

Intelligent gas ultrasonic flow meter can be widely used in:

petroleum, chemical industry, electric power, metallurgy, urban gas supply and other industries to measure the flow of various gases, is currently the oilfield and urban natural gas transmission,and distribution measurement and trade measurement of the preferred product.

Technical Support

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Our ultrasonic gas flow meters are manufactured using advanced German technology, with key components sourced directly from the manufacturer. They feature high reliability, stable performance, and long service life. This high-precision, high-reliability instrument can be widely used for gas flow measurement in industries such as urban gas, petroleum, chemical, power, and metallurgy.

Sino-Inst’s ultrasonic gas flow meters employ a multi-channel design, eliminating the effects of eddies and asymmetrical flow. The multi-channel design adds redundancy and backup channels, improving system reliability. Please feel free to contact us for consultation.

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