ACU20FC Series

The ACU20FC is a high-precision differential-pressure flow controller/flowmeter series. This product series employs a differential-pressure mass measurement principle that features no thermal drift and no response lag, and can simultaneously display and output parameters such as instantaneous flow rate, cumulative flow rate, pressure, and temperature. When control functionality is required, an electromagnetic proportional control valve and built-in PID regulation function can also be added.

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Gas Flow Meters and Flow Controllers

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I. Product Overview

◆ No thermal drift, negligible temperature and time drift, with long-term stability of 0.1% F.S./year.

◆ Accuracy: 0.5%; measurement range can be set via buttons within a 100:1 span—no calibration required.

◆ Instantaneous and cumulative flow, pressure, and temperature can be displayed simultaneously.

◆ No preheating required; no response lag during measurement.

◆ Built-in 30 gas conversion factors; no additional error due to specific heat capacity, ensuring no impact on accuracy.

The ACU20FC differential-pressure mass flow controller employs a differential-pressure mass measurement principle that features zero thermal drift and no response lag. It can simultaneously display and output parameters such as instantaneous flow rate, cumulative flow rate, pressure, and temperature. When control functionality is required, an electromagnetic proportional control valve and built-in PID regulation capabilities can also be added. Unlike thermal mass flow meters, the ACU20FC differential-pressure mass flow controller does not introduce additional “specific heat capacity” errors when using gas conversion factors. Therefore, even if the gas being measured differs from the calibration gas used at the factory, measurement accuracy remains unaffected.

II. Product Applications

The ACU20FC series differential-pressure mass flow controllers are widely used across various industries, including process manufacturing, food analysis, analytical testing, and metrology. Thanks to their multi-variable measurement capabilities and a 50:1 adjustable range, a single ACU20FC differential-pressure mass flow controller can replace the functionality of multiple devices. With an accuracy of 0.5%, repeatability of 0.2%, and a control response time of less than 200 milliseconds, these controllers ensure reliable operation of process gases.

III. Product Parameters

Series	ACU20FC
Model	LC	LM	MC	MM	BC	BM
Measurement range	0–(2, 5, 10...1000) SCCM, 0–(1, 5, 10...30) SLM		0-(30,40,50...300) SLM		0-(300,400,500...3000) SLM
Accuracy	±0.5% F.S.
Repetitiveness	±0.2%F.S.
Linear	±0.25% of F.S.
Working differential pressure	0.1–0.5 MPa (specify when placing an order)
Range ratio	50:1	100:1	50:1	100:1	50:1	100:1
Typical response time	200 milliseconds (adjustable)
Analog quantity	0–5V, 4–20mA
Digital quantity	RS232/485, MODBUS protocol
Power supply	24VDC
Communication protocol	Modbus, DeviceNet, PROFINET, EtherCAT, PROFIBUS, and others
Operating temperature	+10~+50℃
Work pressure drop	<0.01 MPa
Maximum working pressure	1MPa
Electrical connection	DB9 hole
Protection level	IP40
Leak rate	1 × 10⁻⁹ Pa·m³/s
Valve	Valve normally closed	/	Valve normally closed	/	Valve normally closed	/
Base material	Stainless steel
Sealing material	Fluororubber, nitrile rubber, EPDM, perfluoroether
Body thread	G3/8 internal thread				G1/2 internal thread
Joint	Card holders, towers, quick-connect fittings, VCRs, flanges, and more