The ACU20L is a high-precision series of liquid flow controllers and flow meters. This product line employs a differential-pressure mass‑measurement principle that exhibits no thermal drift and zero response lag, enabling simultaneous display and output of parameters such as instantaneous flow, totalized flow, pressure, and temperature. When control functionality is required, it can be equipped with an electromagnetic proportional control valve and built-in PID regulation.
Range: 2SCCM~60SLM

Overview
Applications
Specifications
Dimensions
Software
◆ Differential pressure principle, offering higher accuracy and faster response.
◆Capable of rapidly and accurately measuring the volumetric or mass flow rate of process fluids.
◆ Features uniquely designed vent holes for easy air release.
◆ Instantaneous and cumulative flow rates, as well as temperature, can be displayed simultaneously.
◆ Integrated PID controller for flow regulation
The ACU20L is a high-precision series of liquid flow controllers and flow meters. This product line employs a differential-pressure mass‑measurement principle that exhibits no thermal drift and no response lag, enabling simultaneous display and output of instantaneous flow, cumulative flow, temperature, and other parameters. When control functionality is required, it can be equipped with an electromagnetic proportional control valve and built-in PID regulation.
The ACU20L series liquid flow controllers/flow meters employ an internally compensated laminar‑flow pressure‑drop technology, ensuring that the fluid remains in laminar flow even across a wide flow range.
| Glass industry | Solar energy | Atmospheric Monitoring | Industrial manufacturing |
| Coal Metallurgy | Petroleum and Petrochemicals | Environmental protection | Various instrumental analyses |
| Series | ACU20L | |||||||
| Model number | LC | LM | MC | MM | BC | BM | HC | HM |
| Range of measurement | 0–(2, 5, 10…1000) SCCM | 0-(1,2,3...5)SLM | 0-(5,6,10...20)SLM | 0-(40,45...60)SLM | ||||
| Accuracy | ±1.0%F.S | |||||||
| Repeatability | ±2%F.S | |||||||
| Linear | ±0.5%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 | 50:1 | 100:1 |
| Typical response time | Controller: <0.2 s Flow meter: <0.1 s | |||||||
| Analog quantity | 0–5 V, 4–20 mA, 1–5 V | |||||||
| Digital quantity | RS232/485, MODBUS protocol | |||||||
| Power supply | 24 VDC, ±15 VDC | |||||||
| Operating temperature | 10~50℃ | |||||||
| Working pressure drop | <0.01 MPa | |||||||
| Work stress | 1MPa | |||||||
| Electrical connection | DB9 port, RJ11 | |||||||
| Protection rating | IP40 | |||||||
| Leak rate | 1×10 -9 Pa m 3/S | |||||||
| Valve | Valve normally closed | / | Valve normally closed | / | Valve normally closed | / | Valve normally closed | / |
| Base material | Stainless steel | |||||||
| Sealing material | Fluororubber, chloroprene rubber, nitrile rubber, perfluoroether, metal seals, and others | |||||||
| Body thread | G3/8 internal thread | G1/2 internal thread | ||||||
| Joint | Ferrules, ferrule fittings, quick-connect couplings, VCR fittings, flanges, etc. | |||||||
Mass Flow Measurement and Control System V5.0