SI-20FDL Liquid Mass Flow Controller/Flow Meter

SI-20FDL Liquid Mass Flow Controller-Flow Meter

The SI-20FDL Liquid Mass Flow Controller/Flow Meter is a product based on the thermal principle. It accurately measures and controls the mass flow rate of liquids, ensuring stable fluid flow.

Liquid mass flow controllers can be applied to various liquid flow measurements, such as mass flow monitoring at the top of distillation columns, reactant addition control in reactors, feedstock level metering, discharge control, oil-gas separation in refineries, gasoline chemical dosing control in process furnaces, oil quality monitoring, process control in the food and beverage industry, boiler feedwater flow control in power plants, and process control in the chemical industry.

★★★★★

  • Short delivery time
  • Better price
  • Customizable parameters

Features

  • Accuracy ±1% F.S.;
  • Fast response, high precision;
  • Repeatability up to ±0.2% F.S.;
  • Rapid response and adjustment speed;
  • Touchscreen display;
  • Direct measurement of mass flow;
  • Automatic temperature compensation;
  • Integrated PID controller for flow regulation;
  • Manually switchable liquid media measurement;
  • Tubular flow splitter design minimizes clogging;
  • Suitable for various high/low-pressure pipelines;
  • Short warm-up time, minimal zero drift, high reliability;

Specifications

ModelLiquid Mass Flow ControllerLiquid Mass Flow Meter
Measurement Range2 g/h ~ 1000 g/h
Control RangeController valve control range: 50:1Flow rate range ratio 100:1
Accuracy±1% F.S. (Full Scale)
Linearity±0.5% F.S.
Repeatability±0.5% F.S.
Response Time<0.2 s<0.1s
Temperature Coefficient±0.1% F.S./°C
Operating Temperature0 to 50°C
Warm-up TimeOperational within 30 seconds, reaches optimal state in 5 minutes
Working PressureOperating Pressure Differential: 0.1~0.5MPa Operating Pressure Drop: <0.01MPa
Maximum Pressure Rating3MPa/10MPa
Leak Rate1 × 10⁻⁹ Pa·m³/s
Base MaterialStainless Steel
ConnectionFerrule 1/4“, 3/8”, 1/2″, etc.
Seal MaterialFluorocarbon Rubber, Neoprene, Nitrile Rubber, Metal Seal
Enclosure Protection RatingIP40
Mounting PositionHorizontal Installation
Electrical ConnectionDB9 port, RJ11, 5.5×2.1 quick-connect power plug
Display StatusWith LCD display, without LCD display
Digital OutputRS232/485, MODBUS protocol, PROFIBUS protocol
Analog Output0~5V, 4-20mA, 1~5V
Power Supply24VDC, ±15VDC
  • SI-20FDL-C Liquid Mass Flow Controller Dimensions
    SI-20FDL-C Liquid Mass Flow Controller Dimensions
  • SI-20FDL-C Liquid Mass Flow Meter Dimensions
    SI-20FDL-C Liquid Mass Flow Meter Dimensions

Liquid Mass Flow Controller Working Principle

The SI-20FDL liquid mass flow controller calculates the mass flow rate of a fluid by measuring the heat required for the medium to flow through a heating element (typically a platinum wire).

When liquid passes through the heating element, the element absorbs heat, causing its temperature to rise and its resistance to change. By measuring this resistance change, the flow rate can be determined, and the flow rate can be controlled by adjusting the valve through a feedback control system.

While measuring the flow rate, the controller also monitors the pressure at the liquid inlet and outlet in real time, helping users to fully understand and control the entire reaction process.

In actual operation, the operator sets the desired flow rate value via a display screen or communication interface. The controller uses a PID control algorithm to adjust the opening of the control valve based on the deviation between the actual flow rate and the set value. Changes in the valve opening alter the liquid flow rate through the sensor, gradually bringing the actual flow rate closer to the set value. Continuous adjustment of the control valve eventually stabilizes the actual flow rate near the set value.

Order Guide

Serial NumberSI-20FDL
Product Type【C】Mass Flow Controller   【M】Mass Flow Meter
Pressure Range【M】3MPa 【Z】10MPa (Flow Meter Only)
Local Display【N】Without LCD Display   【X】With LCD Display
Flow Range【002g】2g/h                【010g】10g/h              【050g】50g/h                  【100g】100g/h         
【200g】200g/h       【300g】300g/h        【500g】500g/h             【800g】800g/h                【1000g】1000g/h
Measured MediumReference Density Reference Table
Flow Input Signal【A1】0~5VDC                【A2】4~20mA                  【A3】1~5VDC
Output Signal【B1】0~5VDC                【B2】4~20mA                  【B3】1~5VDC
Power Supply Voltage【5】±15VDC                  【4】24VDC
Communication Method【8】RS485                    【2】RS232
Sealing Material【V】Fluorocarbon Rubber                    【T】Nitrile Rubber                  【N】Neoprene Rubber                       【Y】Other
Used Connectors【A】φ3 【B】φ6 【F】1/8″ 【G】1/4″ 【Y】Others – Contact us
Selection ExamplesSI-20FDL-M    M    M    200C    007    A1    B1    5    8    V    B

Liquid Mass Flow Controller Applications

Liquid mass flow controllers can be applied to various liquid flow measurements, such as monitoring the mass flow rate at the top of distillation columns, controlling the amount of reactants added to reactors, metering the level of raw materials in silos, controlling the discharge rate, oil-gas separation in refineries, controlling the amount of chemicals added to process furnaces, monitoring oil quality, process control in the food and beverage industry, boiler feedwater flow control in power plants, and process control in the chemical industry.

The application scope is extensive, primarily including:

  1. Petrochemical Industry: Used for measuring and controlling liquid flow and mass in petrochemical plants. For example, adding odorants to natural gas to impart a detectable scent.
  2. Food and Beverage Industry: Suitable for production and process control of liquid foods, additives, and beverages.
  3. Medical and Healthcare Industry: Used for flow measurement of various medical liquids, such as blood, pharmaceutical solutions, and glucose solutions.
  4. Manufacturing Industry: Suitable for flow measurement and control in diverse liquid production processes.
  5. Chemical Production: Requires precise control for conveying and metering raw materials and finished products. For instance, quantitative feeding of liquid chemicals during catalytic processes.
  6. Utilizes liquid flow controllers with high-pressure pumps for quantitative feeding in liquid states.
  7. HPLC Applications (Controlling solvent flow).
  8. Leak detection, pump calibration, and pump control.

Technical Support

A liquid flow controller is a device specifically designed for the precise measurement and control of liquid flow rates, such as water, alcohol, methanol, and 48% whey sugar.

The mass flow controller consists of three core units:

High-precision mass flow sensor (MFM): Measures the mass flow rate (not volumetric flow rate) of the flowing gas in real-time and online. It operates based on thermal principles, laminar differential pressure principles, and Coriolis force principles.

Intelligent Control Circuitry and Algorithms: Serving as the “brain” of the MFC, it compares the actual flow signal detected by the sensor against the user-set target flow value. Based on the magnitude and trend of deviation, it employs advanced control algorithms (such as adaptive PID) to calculate precise control signals.

High-Response, High-Precision Proportional Control Valve: Acting as the “actuator,” it receives electrical signals from the control circuit and rapidly, linearly adjusts the valve opening. This ultimately stabilizes the actual flow precisely at the setpoint.

The operating principle of a mass flow controller is based on the law of conservation of mass. The flow sensor measures the mass flow rate of the controlled medium and transmits the signal to the controller. The controller compares the measured mass flow rate with the setpoint and adjusts the valve opening through the feedback control system to achieve the desired mass flow rate.

During the control process, the controller does not need to account for factors like temperature or pressure; it only needs to precisely control the mass flow rate. Modern MFCs typically employ PID control algorithms to achieve closed-loop flow regulation, ensuring the flow remains stable at the setpoint.

MFC for liquid refers to a type of device used to measure and control the flow rate of liquids. A liquid mass flow controller maintains the liquid flow rate in a pipeline at a set value.

MFM (Mass Flow Meter) and MFC (Mass Flow Controller) are two devices used for measuring and controlling gas flow, but their functions and applications differ.

The function of an MFM is to monitor and measure the flow rate, primarily for flow metering or monitoring. It provides accurate flow data but cannot control the flow.

An MFC not only measures flow but also precisely controls it. Users can set a target flow value, and the MFC will automatically adjust and maintain the flow at the set value, even if system pressure or ambient temperature changes.

In practical applications, if only flow measurement is required, an MFM is typically chosen; while when flow control is needed, an MFC is used. For example, when measuring capillary flow capacity, constant pressure flow measurement can use an MFM, while constant flow pressure measurement requires an MFC. Furthermore, an MFC can also be used as an MFM in a purging state, but this will result in a significant pressure drop.

A Mass Flow Controller (MFC) typically consists of the following main components: sensors, control unit, actuators, and a display.

Sensors detect flow data, the control unit processes the data and makes decisions, the actuators adjust the flow, and the display provides the user with real-time flow information.

These components work together to ensure the stability and accuracy of the flow.

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SI-20FDL Liquid Mass Flow Controller/Flow Meter | Sino-Inst

The SI-20FDL Liquid Mass Flow Controller/Flow Meter is a product based on the thermal principle. It accurately measures and controls the mass flow rate of liquids, ensuring stable fluid flow.

Product SKU: SI-20FDL Liquid Mass Flow Controller/Flow Meter

Product Brand: Sino-Inst

Product In-Stock: InStock

Editor's Rating:
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