Flow Meters

 I. Overview

The LU-STU-MFC micro thermal gas mass flow controller uses the thermal diffusion principle to measure and display gas mass flow. By means of a fuzzy PID algorithm, it directly controls the valve opening through two push-pull switch outputs to achieve setpoint control of instantaneous flow, and supports the RS-485 interface with standard MODBUS-RTU communication signals.

The product features an all-metal housing design. The display head can rotate 330° and, combined with a high-brightness LED, ensures the best reading experience under different installation orientations.

II. Technical parameters

Control-type flowmeter

Measuring medium: various gases (except acetylene)

Pipe diameter range: DN10~DN40

Flow velocity range: 0.1~50Nm/s (air)

Accuracy: ±1.5% F.S (maximum range); ±2.5% F.S and ±1.0% F.S optional

Power supply range: DC12~30V

Operating temperature: sensor - 20~+150°C; instrument (excluding sensor) -20~+60°C

Operating pressure: medium pressure ≤1MPa

Communication protocol: RS485 (MODBUS-RTU protocol)

Motorized ball valve

Control mode: forward and reverse rotation control

Motor torque: 8Nm

Filter screen flow straightener

Function: filtration and flow stabilization, reducing the straight pipe section requirement

III. Selection guide

Basic model: LU-STU-MFC (micro thermal flow series number + mass flow controller)

The subsequent selection codes correspond in order to: pipe diameter, straightening grade, power supply, accuracy

1. Pipe diameter code (including upper range limit, air, Nm³/h)

015:DN15(G1/2'),26

020:DN20(G3/4'),45

025:DN25(G1'),70

032:DN32(G5/4'),116

040:DN40(G3/2'),180

2. Straightening grade code

L1: minimum pressure loss, flow up to 100% of the upper limit, requires a straight pipe section greater than 10 times the pipe diameter

L2: higher pressure loss, flow up to 70% of the upper limit, straight pipe section not required

LX: custom

3. Power supply code     D: 24VDC

4. Accuracy code     S: 2.5%F.S       U: 1.5%F.S     H: 1.0%F.S