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Cleanroom Control and Environmental Monitoring Systems
Air Velocity Sensor
An insertion-type hot-film sensor that measures cleanroom duct air velocity directly and provides a linear signal for control or monitoring.
- Hot-Film Velocity Measurement
- Adjustable Probe Insertion
- Selectable Velocity Ranges
- Analog Output Options
Product Introduction
The duct air velocity sensor places a heated-film element in the moving airstream and determines velocity from the heat removed by the flow. A graduated stainless probe and adjustable flange position the sensing tip away from the duct boundary layer. Direction markings help align the element with the airflow, while selectable ranges match low- and high-velocity duct applications. The electronics provide a linear voltage or current output and can include a separate temperature signal for HVAC diagnostics.
Key Features
An adjustable mounting flange places the sensing element at the selected duct depth.
Directional markings prevent installation with the element facing the wrong way.
Selectable output ranges improve signal resolution for different cleanroom duct velocities.
Customer Product Concerns
A duct velocity sensor can be accurate only when its probe is oriented correctly and located outside strong turbulence or the wall boundary layer.
The probe is installed too close to the duct wall and reads a low local velocity.Graduated insertion and an adjustable flange place the element at a representative depth.
The sensor is rotated away from the airflow direction.A visible direction arrow aligns the hot-film element with the moving air.
One wide range gives weak resolution at normal low-speed operation.Selectable velocity ranges match the electrical span to the actual duct condition.
Dust accumulation changes thermal response over time.A smooth protected hot-film design reduces exposed geometry and allows planned inspection.
Typical Applications
Cleanroom supply-air ductsReturn and exhaust branchesAHU airflow verificationLow-velocity process ventilation
Technical Parameters
Typical materials and dimensions for an insertion hot-film duct air velocity sensor are shown below.
| Core Material | Hot-film sensing element in 304 stainless steel probe with ABS and polycarbonate electronics head |
|---|---|
| Panel Thickness | 35-55 mm electronics-head depth |
| Effective Width | 70-100 mm housing width |
| Maximum Length | Up to 210 mm adjustable probe length |
| Steel Facing Thickness | 0.5-0.8 mm stainless steel probe tube |
| Core Density | 7900-8030 kg/m³ for stainless probe components |
| Thermal Conductivity | 14-17 W/(m·K) for 304 stainless steel probe |
| Surface Finish | Satin stainless probe with light-gray housing and blue airflow-direction marking |
| Joint Type | Adjustable duct flange with gasket, M16 cable entry and screw terminals |
| Customization | Available based on the intended application and operating environment. |
Available Options
Low, medium or high velocity rangeVoltage or 4-20 mA outputAir temperature outputHeavy-environment probe
Planning a Air Velocity Sensor specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
