مدونة عن How should I choose the AWM3100V gas flow sensor?

I . How should I choose the AWM3100V gas flow sensor?

The selection of AWM3100V gas flow sensor cannot be based solely on product model and price. The most important thing is to confirm whether it meets the flow range, gas type, working pressure, output signal, and installation requirements of the equipment.

If you are purchasing AWM3100V for industrial equipment, medical equipment, or gas detection equipment, it is recommended to choose from the following aspects.

Parameter: AWM3100V specification
Brand: Honeywell
Product Series: AWM3000
Sensor type: Micro bridge mass flow sensor
Measurement medium: air flow rate
Full range: 0-200 sccm
Output voltage: approximately 1-5 V DC
Zero flow output: 1.00 ± 0.05 V
Full scale output: 5.00 V @ 200 sccm
Recommended power supply: 10 ± 0.01 V DC
Allowable power supply range: 8-15 V DC
Working temperature: -25~85 ℃
Response time: up to approximately 3 ms

Special note: 200 sccm is equivalent to 0.2 L/min. It is suitable for small flow measurement, rather than monitoring large flow pipelines.

In addition, the 25 psi common mode pressure index of AWM3100V cannot be directly understood as allowing pressure difference. The actual gas path pressure and pressure difference must be verified according to the original application instructions.

II. How to choose AWM3100V?

I suggest following the following five steps to make a judgment.

1. Select based on the flow range

This is the most important first step.
-If the device flow is between 0-30 sccm: AWM3150V can be considered.
-If the device flow is between 0-200 sccm: AWM3100V can be considered.
-If the device flow reaches 200-1000 sccm: AWM3300V can be considered.
-If mainly measuring small differential pressure: AWM3200V can be considered.

2. Select based on gas type

The AWM3100V is mainly designed for measuring air flow.

If the usage scenario is:
-Normal air: can be given priority consideration.
-Oxygen: It is necessary to confirm the compatibility, cleanliness, and material requirements of oxygen.
-Nitrogen: Gas calibration and correction factors need to be confirmed.
-Mixed gas: It is necessary to verify the influence of gas components on measurement results.
-Corrosive gases: cannot be directly assumed to be applicable, material compatibility assessment is required.
Especially for medical oxygen equipment, it cannot be directly replaced based solely on the same flow parameters.

3. Select based on circuit output

The AWM3100V output is an analog voltage signal, with a typical range of 1-5V.

Need to confirm:
-Does the main control board support analog voltage acquisition?
-Does the ADC input range meet the requirements?
-Can the device provide sensor power supply of around 10V?
-Do you need additional signal conditioning circuits?

4. Select equipment based on installation structure

Need to verify:
-Inlet and outlet directions.
-Air interface size.
-PCB installation method.
-Definition of sensor pins.
-Has the gas been filtered and dried.
AWM3100V has clear requirements for P1 and P2 flow direction, and cannot be installed in reverse at will.

5. Select based on accuracy and stability requirements

If the device is used for medical respiration, oxygen concentration, or gas analysis, special verification should be conducted:
-The correspondence between actual flow rate and output voltage.
-Measurement deviation caused by temperature changes.
-Zero drift after prolonged work.
-Measurement deviation under different gas media.
-The repeatability of the whole machine after calibration.

III. Typical application scenarios of AWM3100V.

1. Medical respiratory equipment

Used to assist in monitoring the airflow in the respiratory tract and help control gas delivery for equipment. Actual medical applications require complete machine safety and accuracy verification.

2. Oxygen production equipment

Used to monitor gas flow, assist equipment in flow control, and determine operating status. Additional verification of oxygen compatibility is required.

3. Gas analyzer

Used to detect small flow rate changes during gas sampling or transportation inside the analyzer.

4. Gas leakage detection equipment

It can be used to assist in monitoring and testing flow changes in the gas path, but cannot be directly used as an independent safety leak alarm device.

IIII. 

My selection suggestion: If the customer's equipment measures an air flow rate of 0-200 sccm, the power supply can meet 8-15V, and analog voltage acquisition is used, then AWM3100V is worth prioritizing evaluation. If measuring oxygen or other special gases, further verification of medium compatibility and calibration conditions must be conducted.

In addition, the original installation instructions require avoiding condensation and particle contamination in the gas, and it is recommended to install appropriate filtration measures upstream.
Honeywell

You can also send me the model of the customer's device, the original flow sensor model or device parameters, and I can further help you with the AWM3100V replacement and adaptation analysis, to determine whether it can be directly replaced, whether the circuit needs to be modified, and whether there is a more suitable model.