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ASAIR AFM0725 Instruction Manual
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ASAIR AFM0725 Instruction Manual

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AFM0725 Instruction Manual
Gas Mass Flow Meter
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
Product description
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.
The range, accuracy, repeatability and response time of AFM0725 have been strictly calibrated before leaving the factory.
Scope of application
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.
www.aosong.com
Figure 1.
AFM0725
July 2022
1 /
12

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Summary of Contents for ASAIR AFM0725

  • Page 1 Product description 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.
  • Page 2 1.1 Appearance structure Figure 2 shows the appearance structure and working interface of AFM0725, including the sensor air duct and working interface. The working interface includes an LCD display screen and operation buttons. The contents displayed on the LCD include the Modbus communication address of the flowmeter, gas temperature, cumulative flow and instantaneous flow.
  • Page 3 Table 1. Device 8Pin female header pin definition definition power cable Voltage output RS485A External output 1 External output 2 RS485B 1.3 AFM0725 pinout The pinout definitions are shown in Table Table 2. Pinout Definitions pinout definition white line power cable black line...
  • Page 4 30cm length UL2464 material 2. AFM0725 technical indicators and mechanical parameters Table 3. AFM0725 Specifications and Mechanical Parameters describe parameter AFM0725 model 0~25L/min range ±3%FS precision RS485, NPN open collector output, 1~5V linear voltage output output method ±1%FS Repeatability 50ms Response time 9ÿ24V DC...
  • Page 5 3. Product dimension drawing and piping method 3.1 The dimensions of AFM0725 are shown in Figure 4. Figure 4. AFM0725 Dimensions (Unit: mm) 3.2 Piping method, as shown in Figure 5. Figure 5. Piping Diagram (1) For the piping of the product inlet/outlet, please reserve a straight pipe part with a length of more than 12cm, and the inner diameter of the straight pipe is less than 4mm (including 4mm).
  • Page 6 4. Product Communication Protocol and Output 4.1 RS485 communication The digital output communication mode of AFM0725 gas mass flowmeter is RS485 communication, and the communication parameters are shown in Table 4. Table 4. RS485 Communication Parameters describe Communication parameters Protocol format...
  • Page 7 1: Lower limit alarm The number of the model is directly converted to 16 0x0030 0~65535 read only model base number Such as AFM0725 —> 0x02d5 0x0031 0~9999 read only 1 Software version such as V0001—>0x0001 0: L/min 0x0032 Read and Write 03/06 1 flow unit 1: CFM×10-1...
  • Page 8 CRC code is used for verification When the host needs to change the slave address of AFM0725 to 0x02, it needs to rewrite the value of the 0x0035 register. Host write register value The command format is shown in Table 8.
  • Page 9 AFM0725 has 2 NPN open collector output ports, 2 NPN open collector output ports correspond to external output 1 and external output respectively Output 2, external output 1 controls the upper limit alarm, and external output 2 controls the lower limit alarm. If the AFM0725 lead wire is purchased, the external output 1 (NPN1) corresponds to the gray wire, the external output 2 (NPN2) corresponds to the brown wire, and the GND corresponds to the black wire and the orange wire.

  • Page 10: Voltage Output

    4.3 Voltage output The voltage output of the AFM0725 is a linear output. The relationship between voltage and flow is: Voltage (V) = 1 + Instantaneous flow (L/min) × 0.16 5. Work interface and interface operation Figure 7. Introduction to screen icons ÿ...

  • Page 11: Packing List

    View the model, range, version, and SN code of the device Device Information quit Back to one level menu quit back to main interface 6. Packing List packing list name quantity AFM0725 1 set AFM0725 pinout Product Manual 1 serving certificate 1 piece www.aosong.com July 2022 11 / 12...
  • Page 12 Repair or replacement service. Warranty Period Description Product Category warranty period AFM0725 Gas Mass Flow Meter 12 months Wire or other parts 6 months The company is only responsible for products that are defective when used in applications that meet the technical conditions of the product. The company should No guarantee is made for use in non-recommended special scenarios.