Bronckhorst F-201C-EB-33-V Mass Flow Controller
Introduction of the device
BRONKHORST HIGH-TECH F-201C-EB-33-V is a professional and highly accurate Mass Flow Controller (MFC) made in the Netherlands, designed to measure and control the flow of gases in industrial, laboratory and research processes. This device uses Thermal Mass Flow technology and in addition to measuring, it automatically adjusts the gas flow with the help of an internal control valve. 
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Your Device Specifications
Based on license plate information:
value attribute
Manufacturer of Bronkhorst High-Tech
Model F-201C-EB-33-V
Serial number 911138N
AIR calibrated gas
Flow range 4.0 Ln/min
Inlet pressure P1 2.00 bara
Output pressure P2 1.00 bara (probably)
Reference temperature 20°C
Normally Closed Control Valve type
Pressure test done
Helium leak test done
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What is Ln/min?
The phrase 4.0 Ln/min means:
4 normal liters per minute
is It means that the device is calibrated to pass and accurately control 4 liters of air per minute under standard conditions.
This value shows that the device is designed for precise and sensitive processes and is considered a precision instrument equipment.
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how it works
There are three main parts inside this equipment:
The device measures the actual amount of air flow and keeps the flow at the set value by opening or closing the internal valve. This technology makes pressure and temperature changes have very little effect on flow control. 
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Applications
This model is widely used in sensitive industries:
Semiconductor and electronics industries
• Wafer production lines
• Vacuum equipment
• CVD and PVD systems
Gas industries
• Nitrogen control
• Oxygen control
• Calibration lines
labs
• Equipment testing
• Gas chromatography
• Gas analysis systems
Chemical industries
• Precise injection of process gases
• Chemical reactors
Pharmaceutical industries
• Drug production lines
• control of sterile gases
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Technical features of F-201C series
The features of this family of gas mass controllers are:
• Very high accuracy
• Excellent repeatability
• Fast response
• Suitable temperature stability
• Digital communication capability
• Internal control valve
• Helium leak test in the factory
• Ability to work in different industrial pressures 
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Global value and price
Considering that this model is from the old EL-FLOW series, its price depends on the state of calibration and health:
Approximate price status
Used in good condition $300-$900
Tested and calibrated $800 to $1800
New or New Old Stock $2000 to $4500
Bronckhorst models still have a very good market even after many years due to their high accuracy and use in semiconductor industries.
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Bachelor's summary
The Bronkhorst F-201C-EB-33-V model is not an ordinary solenoid valve or a simple flowmeter; Rather, it is a high-precision gas mass controller (Mass Flow Controller) designed to control 4 liters of normal air per minute. The existence of helium leakage test, internal control valve and high measurement accuracy have made this equipment to be of significant value in advanced industries. In the case of complete health and the possibility of recalibration, this device is still considered one of the valuable equipment of industrial precision instruments.