SI-10FDR Series Low Differential Pressure Gas Mass Flow Controller

SI-10FDR Low Differential Pressure Gas Mass Flow Controller

SI-10FDR LOW-ΔP Mass Flow Controller is designed for mass flow control in systems with minimal available pressure. Equipped with a proprietary high-flow electromagnetic valve, its low pressure drop ensures minimal system impact, enabling flow control near atmospheric pressure conditions and reducing system response time.

We customize valve and PID control functionality based on your application parameters, ensuring rapid, stable control while maintaining low pressure loss.

★★★★★

  • Short delivery time
  • Better price
  • Customizable parameters

Features

  • Low pressure drop;
  • Multivariable measurement with 50:1 adjustable range ratio;
  • Suitable for corrosive gases;
  • Reduced contamination risk;
  • Wetted parts made of stainless steel for easy cleaning;
  • Optional control valve for a complete, compact control loop;

Specifications

Operating statusOperating Temperature+10~+50℃
Maximum Working Pressure3MPa/10MPa
Requirements for Installation Method/Orientation>1L/min range, valve must be installed vertically
Valve ClassValve long-term closed
Protection RatingIP40
MaterialStainless steel
SignalMonochrome LCD DisplaySimultaneously display flow rate and set 
Digital Output SignalRS485/RS232
Analog Input Signal0-5Vdc / 4-20mA
Analog Output Signal0-5Vdc / 4-20mA
Electrical Signal InterfaceDB15
Supply Voltage24-30Vdc
Supply Current0.750Amp
SpecificationMeasurement RangeLow range: 150-600 SLM
Medium range: 600~1200 SLM
Accuracy (under standard conditions after zero adjustment)±1%F.S
Repeatability±1%F.S
Zero Drift & Full-Scale Drift0.02% F.S/ ºC/Atm
Adjustable Ratio of Operating Range/Measurement Range2% ~ 100% F.S / 50:1
Maximum Measurable Flow Rate100% F.S. (Controllable)
Typical Response Time200 milliseconds (Adjustable)
Start-up Warm-up Time< 5 seconds
  • SI-10FDR Low Differential Pressure Gas Mass Flow Controller Size (Low range)
    SI-10FDR Low Differential Pressure Gas Mass Flow Controller Size (Low range)
  • SI-10FDR Low Differential Pressure Gas Mass Flow Controller Dimensions (Medium range)
    SI-10FDR Low Differential Pressure Gas Mass Flow Controller Dimensions (Medium range)

Low Differential Pressure Gas Mass Flow Controller Applications

The SI-10FDR series low differential pressure gas mass flow controllers are widely used in various industries, such as: process manufacturing, heat treatment, laboratories, environmental protection equipment, food analysis, analytical testing and measurement, etc.

Multivariable measurement and a 50:1 adjustable range ratio allow a single SI-10FDR low differential pressure gas mass flow controller to replace the functionality of multiple devices.

1% accuracy, 1% repeatability, and a control response time of less than 200 milliseconds ensure the normal operation of process gases.

Order Guide

Model NumberSI-10FDR-L (small range);    SI-10FDR-M (medium range);
Product Type【C】Mass flow controller  
Pressure Rating Range【M】3MPa          
Field Display Status【N】Without LCD display 【X】With LCD display
Flow RangeSmall range: 【0150L】 150SLM 【300L】 300SLM
【500L】 500SLM 【600L】600SLM
Medium range: 【700L】 700SLM 【900L】 900SLM 【1000L】1000SLM 【1200L】 1200SLM
【0000L】 User specified
Measured MediumSee density reference table for details.
Flow Input Signal【A1】0~5VDC                   【A2】4~20mA                       【A3】1~5VDC
Output Signal【B1】0~5VDC                   【B2】4~20mA                       【B3】1~5VDC
Supply Voltage【5】±15VDC                     【4】24VDC
Communication Method【8】RS485                        【2】RS232
Seal Material【V】 Fluororubber      【T】 Acrylonitrile rubber      【N】Chloroprene rubber     【Y】Other
Connector Type【E】φ12    【L】Flange installation    【Y】Other (Contact the manufacturer)
Selection ExampleSI-10FDR-M    C    M    0030L    007    A1    B1    5    8    V    E

Why is a pressure difference required between the inlet and outlet of a mass flow controller?

A mass flow controller (MFC) is equipped with an electromagnetic proportional valve to regulate gas flow. The proportional valve controls the flow rate. Due to the presence and operation of the control valve, system resistance increases, resulting in a pressure loss as gas passes through the flow controller. This pressure drop, or pressure difference, occurs between the inlet and outlet of the flow controller.

Some customers experience flow control failures when using MFCs, and a significant reason for this is the failure to meet the required pressure difference between the MFC inlet and outlet.

For example, the operating pressure difference range of most common MFCs on the market is typically around 0.05–0.5 MPa. If the pressure difference between the inlet and outlet is below the lower limit, the gas pressure may not be enough to open the proportional valve to the appropriate position. Therefore, the full-scale value or the set flow rate may not be reached. Conversely, if the pressure difference is too large, exceeding the upper limit, the control valve may not close properly, leading to leakage.

Therefore, when selecting an MFC, users should ideally provide the pressure values, differential pressure values, or port conditions of the flow controller’s inlet and outlet. This allows us to recommend a suitable model and calibrate it according to requirements based on the actual differential pressure, or provide reasonable suggestions to the user.

Of course, in actual use, some operating conditions require minimal pressure loss, meaning a very small pressure drop. This means the pressure difference between the flow controller’s inlet and outlet must be very small, less than the differential pressure range of a typical MFC. For example, applications involving combustible gases such as natural gas, methane, and propane, or many heat treatment processes, all involve low pressure loss requirements. In such cases, our low-differential-pressure gas mass flow controller can be selected. We can provide low-pressure-loss solutions based on the customer’s actual operating requirements, approaching or achieving the low-pressure-loss performance of other brands of flow controllers to meet the customer’s needs.

Furthermore, some special applications require high differential pressures, reaching 5 MPa or even higher. We already have practical applications meeting these requirements and can satisfy the needs of some customers.

Gas Mass Flow Controller Working Principle

A pressure regulator is a device used to control the pressure of fluids (gas or liquid) in a system or equipment. Its main function is to adjust the fluid pressure at the input end to a predetermined output pressure and maintain that output pressure stably.

A mass flow controller (MFC) is a device used to accurately measure and control the mass flow rate of gases or liquids. It not only functions as a mass flow meter, but more importantly, it can automatically control the gas flow rate, maintaining the flow rate at a set value even when system pressure fluctuates or ambient temperature changes.

Based on their measurement principles, common flow controllers include differential pressure, electromagnetic, vortex, ultrasonic, and thermal types. Differential pressure flow controllers calculate flow rate by measuring the pressure difference before and after the fluid passes through a throttling device; they are simple and reliable but suffer from significant pressure loss. Electromagnetic flow controllers utilize Faraday’s law of electromagnetic induction, are only suitable for conductive liquids, offer high measurement accuracy, and have no moving parts. Vortex flow controllers, based on the Karman vortex street principle, determine flow rate by detecting the frequency of vortices in the fluid and are suitable for clean gases and liquids.

Thermal flow controllers calculate flow rate by measuring the rate at which heat is carried away by the fluid, making them particularly suitable for measuring the flow rate of small gases. Ultrasonic flow controllers utilize the time difference between the forward and reverse propagation of sound waves in the fluid, providing non-contact measurement with no pressure loss. Coriolis mass flow controllers directly measure mass flow rate rather than volumetric flow rate, offering the highest accuracy but also being relatively expensive.

In fluid mechanics, mass flow rate is a crucial parameter describing the mass of fluid passing through the cross-section of a pipe or channel per unit time. It directly affects the flow characteristics and pressure loss of the fluid within the pipe. In thermodynamics, mass flow rate is closely related to energy transfer; for example, in heat exchangers, the mass flow rate directly impacts heat transfer efficiency.

In short, mass flow rate is of great significance in engineering, involving multiple fields such as fluid mechanics, thermodynamics, industrial production, environmental protection, and resource utilization. Mass flow rate plays a vital role in ensuring the safe and stable operation of engineering projects, improving production efficiency, protecting the environment, and conserving resources.

The outlet pressure of a mass flow controller (MFC) typically depends on its operating differential pressure range. Generally, the operating differential pressure range of a typical MFC is approximately 0.05–0.5 MPa, meaning that under normal conditions, the outlet pressure will vary within this range.

If the differential pressure between the inlet and outlet is below the minimum value, the gas pressure may not be able to open the proportional valve, thus failing to reach the set flow rate. If the differential pressure is too high, it may cause the control valve to fail to close, leading to gas leakage.

The range of a mass flow controller is typically 2% to 100% F.S., depending on the equipment design and application.

For example, the Sino-Inst mass flow controller has a controllable range of 2%-100% and a range ratio of 50:1 to meet different production needs. When selecting a mass flow controller, the required range needs to be determined based on actual requirements to ensure measurement accuracy and reliability.

The core function of a flow controller is to monitor and precisely regulate the flow rate of a medium in real time. A typical system consists of three main parts: a flow sensor, a control unit, and a regulating mechanism.

Flow controllers are indispensable key equipment in modern industrial automation and process control systems. They ensure stable and efficient operation of production processes by precisely regulating the flow rate of liquids, gases, and other media in pipelines or channels.

These devices are widely used in petrochemical, pharmaceutical, food processing, water treatment, and HVAC systems, among other fields. Their performance directly affects product quality, energy consumption, and production safety.

General accuracy mass flow controllers typically have an accuracy between ±1% FS and ±2% FS, suitable for laboratory instruments, analytical instruments, and other fields. They can meet the flow control accuracy requirements of most routine experiments and analyses, providing reliable flow control for experiments and analyses.

Sino-Inst’s high-accuracy mass flow controllers have an accuracy of ±0.5% FS for gases and ±0.25% for liquids (FS is full scale). They are commonly used in semiconductor manufacturing, microelectronics, and other fields with extremely high requirements for gas flow control accuracy to ensure process consistency and product quality stability.

Symptoms of flow control valve malfunctions include flow regulation failure, unstable flow, and excessive internal leakage.

These malfunctions may be caused by radial jamming of the valve core, a faulty regulating device, unclean oil, improper installation, uneven or excessive tightening of screws causing valve body deformation, leading to radial jamming of the valve core and resulting in regulation failure.

Furthermore, repairing flow control valves requires checking the geometric accuracy of the valve core and valve sleeve. If the clearance is too small, grinding and fitting should be performed to prevent jamming. If the clearance is too large, the valve core can be repaired using brush plating technology.

In gas pipelines, a mass flow controller (MFC) is an instrument used to accurately measure and control the mass flow rate of gas.

The principle of a thermal mass flow controller is based on the thermal diffusion effect and the principle of thermal equilibrium. It achieves high-precision control of mass flow rate by measuring the disturbance of the thermal field caused by gas flow.

Its core sensor typically consists of a heating element and symmetrically distributed temperature sensors. When the gas is stationary, the thermal field between the heating element and the temperature sensors is symmetrically distributed. When the gas flows, fluid molecules carry away heat, causing the temperature downstream of the heating element to drop, forming a temperature difference related to the flow rate.

According to King’s Law, the gas mass flow rate has a linear relationship with the temperature difference and the heating power. By measuring the temperature difference or adjusting the heating power, the gas mass flow rate can be calculated.

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The Low Differential Pressure Gas Mass Flow Controller features a digital display screen, allowing operation of gas switching, set flow rate control, and PID valve adjustment. It also supports analog and digital communication, including options for Profibus-DP, Modbus, and RS-485/232 serial communication.

Sino-Inst’s low pressure loss gas mass flow controllers are widely used across various industries, especially suitable for applications where system pressure is easily lost due to flow meters. Examples include: manufacturing processes, food analysis, analytical testing and metering, as well as atmospheric testing systems, environmental monitoring systems, and applications involving natural gas and methane combustion gases, where the inlet pressure is very low but gas flow control is still required.

Contact our sales engineers anytime for customized mass flow controllers!

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Low Differential Pressure Gas Mass Flow Controller | LOW-ΔP-FLOW

SI-10FDR LOW-ΔP Mass Flow Controller is designed for mass flow control in systems with minimal available pressure. Equipped with a proprietary high-flow electromagnetic valve, its low pressure drop ensures minimal system impact, enabling flow control near atmospheric pressure conditions and reducing system response time.

Product SKU: SI-10FDR Series Low Differential Pressure Gas Mass Flow Controller

Product Brand: Sino-Inst

Price Valid Until: 2999-09-09

Product In-Stock: PreOrder

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