ASAIR AFM0725 User Manual

The AFM0725 is a thermal mass flow sensor that calculates the mass flow of the gas being measured by measuring the change in resistance. The sensor adopts
the self-developed MEMS mass flow chip, which has the characteristics of intuitive, accurate, stable, high and low temperature resistance, good linearity, and short response
time.
AFM0725 is suitable for mass flow monitoring of air, nitrogen, argon, carbon dioxide, helium, oxygen and other dry, clean and non-corrosive gases (except flammable
and explosive gases). It has been widely used in university scientific research, fire protection, environmental monitoring, tobacco, smart agriculture, food, medicine and other
industries.
The range, accuracy, repeatability and response time of AFM0725 have been strictly calibrated before leaving the factory.
ÿ Integrated mass flow and temperature
measurement ÿ Good repeatability ÿ Supports
multiple gas measurements ÿ Standard Modbus-
RTU communication ÿ 2 NPN open collector
outputs (for upper and lower limit alarms) ÿ 1~5V linear voltage output 9ÿ24V DC power
supply
AFM0725 Instruction Manual
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Figure 1.
July 2022
AFM0725
Product description
Gas Mass Flow Meter
Scope of application

ASAIR AFM0725 Specifications

General

Model	AFM0725
Display	LCD
Battery Type	9V battery
Auto Power Off	Yes
Data Hold	Yes
Max/Min/Avg	Yes
Type	Anemometer
Measurement Range	0.3-30 m/s
Units	m/s, km/h, ft/min, knots, mph

Summary

Product Description

Scope of Application

Appearance Structure and Interface Definition

Appearance Structure

Explains the AFM0725's physical appearance, interface components like LCD and buttons, and air duct.

Device 8Pin Female Socket

AFM0725 Pinout

Technical Indicators and Mechanical Parameters

Product Dimension Drawing and Piping Method

Dimensions of AFM0725

Presents the physical dimensions of the AFM0725 unit in millimeters.

Piping Method

Provides guidelines for connecting the AFM0725, including inlet/outlet piping requirements.

Product Communication Protocol and Output

RS485 Communication

Details the RS485 communication protocol, including format, rate, and parameters for the AFM0725.

NPN Open Collector Output

Work Interface and Interface Operation

Voltage Output

Describes the linear voltage output of the AFM0725 and its relation to instantaneous flow.

Packing List

Warning and Personal Injury

Quality Assurance