ACU20FC Series

The ACU20FC is a high-precision differential-pressure flow controller/flowmeter. This series employs a differential-pressure mass‑measurement principle that exhibits no thermal drift and no response lag, enabling simultaneous display and output of instantaneous flow, totalized flow, pressure, temperature, and other parameters. When control functionality is required, it can be equipped with a proportional solenoid valve and built-in PID control.

Measuring Range: 0-3000SLM

Datasheet (PDF) 869 KB

Category: Gas Flow

Overview

Applications

Specifications

Dimensions

Software

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

◆ Accuracy of 0.5%; the measurement range can be set via keypad within a 100:1 span, with no calibration required.

◆ Simultaneous display of instantaneous and cumulative flow, pressure, and temperature

◆ No warm-up required; no response lag during measurement.

◆ Built-in with 30 gas conversion coefficients; negligible additional error in specific heat capacity, with no impact on accuracy.

The ACU20FC differential-pressure mass flow controller employs a differential-pressure-based mass‑flow measurement principle that exhibits no thermal drift and zero response lag, enabling simultaneous display and output of instantaneous flow, cumulative flow, pressure, temperature, and other parameters. When control functionality is required, it can be equipped with a solenoid‑proportional control valve and built‑in PID regulation. Unlike thermal mass flow meters, the ACU20FC does not introduce additional “specific heat capacity” errors when gas conversion factors are applied. Consequently, even if the measured gas differs from the calibration gas used at the factory, measurement accuracy remains unaffected.

The ACU20FC series differential-pressure mass flow controllers are widely used across various industries, including process manufacturing, food analysis, and analytical testing and metrology. Their multi-variable measurement capabilities and 50:1 adjustable turndown ratio enable a single ACU20FC controller to 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, they ensure reliable operation of process gases.

Series	ACU20FC
Model number	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
Repeatability	±0.2%F.S
Linear	±0.25%F.S
Working differential pressure	0.1–0.5 MPa (to be specified at the time of order)
Range ratio	50:1	100:1	50:1	100:1	50:1	100:1
Typical response time	200 milliseconds (adjustable)
Analog quantity	0–5 V, 4–20 mA
Digital quantity	RS232/485, MODBUS protocol
Power supply	24VDC
Communication protocol	Modbus, DeviceNet, Profinet, EtherCAT, Profibus, and others
Operating temperature	+10~+50℃
Working pressure drop	<0.01 MPa
Maximum working pressure	1MPa
Electrical connection	DB9 port
Protection rating	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	Ferrules, ferrule fittings, quick-connect couplings, VCR fittings, flanges, and more