Cleanroom Air Distribution Systems

Duct Airflow Measuring Station

A permanently installed multi-point sensing assembly that converts representative duct velocities into continuous volumetric airflow and temperature data.

Multi-Point Velocity Traverse
Low-Airflow Measurement
Remote Digital Transmitter
Supply or Exhaust Monitoring

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Product Introduction

The duct airflow measuring station uses several bead-in-glass thermal sensors distributed across the duct cross-section to capture a representative velocity traverse. Each node compares a heated element with a reference temperature element, and the remote transmitter combines the readings with the entered duct area to calculate volumetric or mass airflow. Stainless-steel probes, plenum-rated cables and an external display enclosure suit permanent installation where operators need more than a one-time balancing reading. Analog and network outputs can feed room-pressure control, air-change verification or maintenance trending.

Key Features

Multiple independently calibrated sensing nodes reveal an uneven velocity profile that a single-point probe can miss.

Thermal-dispersion measurement operates at the low duct velocities common in ventilation and pressure-tracking branches.

A remote transmitter displays airflow and temperature while isolating electronics from the active duct section.

Selectable analog and serial communications support connection to airflow alarms or a building control system.

Customer Product Concerns

Reliable airflow control depends on a measurement point that represents the whole duct profile and remains stable at low velocity.

An elbow or transition creates a skewed velocity profile across the measuring plane.A multi-node probe array averages velocities over the duct area instead of reporting one unrepresentative point.

Pitot-style pressure signals become too small for dependable low-flow tracking.Thermal-dispersion sensor nodes retain useful resolution at substantially lower air velocities.

A failed probe remains unnoticed while the control loop continues using a false total.Node-status diagnostics and configurable alarms identify sensor or transmitter faults for maintenance.

Temporary balance readings do not show later drift caused by filter or fan changes.Permanent measurement provides continuous total airflow and a recordable signal for trend comparison.

Typical Applications

Cleanroom supply-air verificationReturn and exhaust airflow trackingLaboratory pressure-control systemsOutdoor-air delivery monitoringAir-change-rate performance trending

Technical Parameters

Typical construction and dimensional ranges for a permanent multi-point duct airflow station are listed below.

Core Material	304 stainless-steel probe tubes with hermetically sealed thermistor nodes and plenum-rated sensor cables
Panel Thickness	1.0–2.0 mm stainless probe supports and mounting plates
Effective Width	100–2500 mm duct traverse width using one or more probes
Maximum Length	Up to 2500 mm active probe length for rectangular duct arrays
Steel Facing Thickness	1.0–2.0 mm stainless mounting flange and probe bracket
Core Density	Approximately 8000 kg/m³ for 304 stainless-steel probe components
Thermal Conductivity	Approximately 14–16 W/(m·K) for 304 stainless-steel probe components
Surface Finish	Clean passivated stainless probes with powder-coated remote transmitter enclosure
Joint Type	Duct-insertion compression flange with sealed cable glands to a remote transmitter
Customization	Available based on the intended application and operating environment.

Available Options

Round-duct single-probe configurationRectangular multi-probe traverse arrayAnalog 0–10 V or 4–20 mA outputsBACnet or Modbus communication interface

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