SI-3301 Gas Vortex Flow Meter
SI-3301 digital gas vortex flow meter is a flow meter operating with Karman Vortex principle for flow rate of gases (air, oxygen, nitrogen, coal gas, natural gas, chemical gas, etc.). It could be used in automatic control system as flow transmitter.

| Diameter | DN15~DN1800 (mm) |
| Accuracy | Pipe type: Class 1.0 Insertion type: Class 2.5 |
| Temp. range | -40℃~+400℃ |
| Pressure | 1.6 MPa (offer 2.5Mpa and 4.0Mpa customization) |
| Flow rate | 5-60m/s |
| Output | Voltage pulse, 4-20mA output, HART, Modbus, RS485, RS232 options. |
Features
- Without movable parts and adopt simple structure, easy to install and maintain.
- The product is with stable performance and no zero drifting, offering pipe and insertion sensor type options.
- Wide measurement range, the highest range ratio could reach to 20:1
- Low pressure loss and consumption.
- Assemble with anti-interference circuit and anti-vibration sensors, which could ensure anti-vibration performance of the product.
Specifications
| Item | Data |
| Medium | Air,nitrogen, coal gas, natural gas, chemical gas,steam etc. |
| Accuracy | Pipe type: Class 1.0 Insertion type: Class 2.5 |
| Medium temperature | -40℃~+400℃ |
| Nominal pressure | ≤1.6Mpa (offer ≤2.5Mpa and ≤4.0Mpa customization) |
| Flow rate | 5-60m/s |
| Output | Voltage pulse, 4-20mA output, HART, Modbus, RS485, RS232 options. |
| Installation | Flange, clamp flange, insertion, threat, clamp connection |
| Power | 12~28VDC;85~265VAC (Remote display);3.6V lithium battery (on site display) |
| Operating condition | Temperature: -25℃~60℃ Humidity: 5%~90% |
| Housing material | 1Cr18Ni9Ti |
Order Guide
In addition to regular products, we support customization
| SI-3301- | Note | ||||||||||
| Nominal diameter | DNXX | DN15~DN1800 (mm) | |||||||||
| Structure | F | Remote type with display | |||||||||
| Y | Compact type with display | ||||||||||
| Accuracy | A | Pipe type: Class 1.0 | |||||||||
| B | Insertion type: Class 2.5 | ||||||||||
| Nominal pressure | 16 | 1.6Mpa | |||||||||
| XX | Customization | ||||||||||
| Max. temp. of medium | M | <250℃ | |||||||||
| H | >250℃ | ||||||||||
| Other function | P | With pressure compensation | |||||||||
| T | With temperature compensation | ||||||||||
| PT | With pressure and temperature compensation | ||||||||||
| Power | 1 | 12~28VDC | |||||||||
| 2 | 3.6V lithium battery (on site display) | ||||||||||
| 3 | 85~265VAC (Remote display) | ||||||||||
| Output | A | 4-20mA | |||||||||
| M | Voltage pulse | ||||||||||
| H | HART | ||||||||||
| R1 | RS232 | ||||||||||
| R2 | RS485 | ||||||||||
| Installation | 1 | Flange | |||||||||
| 2 | Clamp flange | ||||||||||
| 3 | Insertion | ||||||||||
| 4 | Thread | ||||||||||
| 5 | Clamp | ||||||||||
| Explosion proof | A | No explosion proof | |||||||||
| B | Intrinsic explosion proof | ||||||||||
| G | Flame proof | ||||||||||

Applications
Vortex flow meters are designed based on the Karman vortex street principle and are suitable for measuring the volumetric and mass flow rates of superheated steam, saturated steam, and various general gases. Their applications are wide-ranging, covering various media flowing in industrial pipelines, especially in gas flow measurement scenarios where a certain level of measurement accuracy is required and the flow rate is suitable.
Vortex gas flow meters can measure a variety of gases, including but not limited to the following types:
- Fuel gases: coal gas, natural gas, liquefied petroleum gas
- Industrial gases: air, nitrogen, oxygen, argon, compressed air
- Chemical gases: hydrogen peroxide, chlorine, phosgene, hydrogen sulfide, sulfur dioxide, ammonia
- Hydrocarbon gases: methane, butane, acetylene
- Special gases: flue gas, biogas, carbon dioxide
- Others: toluene, benzene, xylene, and other volatile organic compounds
Techincal Support
Gas Measurements: Normal Conditions vs Standard Conditions
Thermal Mass Flow Meter Correction Factor Guide
Analog Gas Flow Meters | Types and Product List
Rotameters: Excellent Choice for Flow Measurement in Various Gases
Flow Meter Selection Guide: Starting from Measurement Conditions
Whether it’s air, natural gas, nitrogen, or oxygen, vortex flow meters can reliably measure gas flow rates. This provides crucial support for gas supply, control, and monitoring, such as in natural gas supply and gas transportation.
Sino-Inst’s vortex flow meters offer stable performance, are shock-resistant, and feature integrated temperature and pressure compensation, providing accurate flow data for various industries, contributing to industrial development and improved production efficiency. If you require a customized vortex gas flow meter, please feel free to contact our sales engineers!

Zhang Wei, possesses 20 years of experience as an automation instrumentation engineer, specializing in the research, design, installation, commissioning, and maintenance of automation instruments.
Face to various instrument communication protocols (such as Modbus, Profibus, etc.), with solid hardware circuit design and software programming skills (proficient in C language and PLC programming). Has extensive project experience; projects he has led and participated in have all achieved outstanding results, improving product accuracy, reducing costs, and increasing production efficiency.
Possesses excellent communication and coordination skills and a strong team spirit, enabling him to quickly respond to customer needs and provide high-quality automation instrumentation solutions.



