Home - Products - Flow Measurement Devices - Air Flow Measurement (Outdoor & Duct)

Air Flow Measurement (Outdoor & Duct)


Air flow outdoor

air flow outdoor

OAM II Outdoor Airflow Measurement System & Airflow Station

OAM II Outdoor Airflow Measurement Systems consist of the OAM II Transmitter with built-in barometric pressure sensor, one or more uni-sensors or OAM II Airflow Stations, and one or two temperature sensors. The system has been designed to measure the actual airflow rate to within ±5% by measuring differential pressure across a fixed inlet, such as a louver, screen or layer of expanded metal.

The OAM II Transmitter has been optimized for most common outdoor airflow applications. It is provided with a color graphics display, 4 analog outputs and RS485 BACnet / MODBUS.

Air Monitor’s uni-sensor flow element is made for outdoor airflow measurement. It is unaffected by airborne dust, debris, and moisture. The innovative design provides reliable flow measurement without the need for long straight runs and it is largely immune to effects of shifting wind loads and wind gusts.


Air duct thermal mass

air duct thermal mass

ELECTRA-flo 5 Series Thermal Airflow Measurement System

The ELECTRA-flo Thermal Probe Array utilizes thermal dispersion technology in multi-point probes to measure average airflow and temperature. The rugged anodized aluminum probes have aerodynamic sensor apertures that condition turbulent airflow, resulting in a NIST traceable accuracy of ±2% of actual flow.

Each probe array comes complete with an ELECTRA-flo G5 Transmitter that provides connectivity to BACnet MS/TP or Modbus RTU networks. Two analog outputs are also available for airflow and temperature. The G5 user interface displays airflow and temperature data. It also allows for easy access to all product configuration and field characterization settings. The true dual channel G5 transmitter option has duct size and sensor point allocation set independently for two separate channels.


Air duct thermal mass

air duct thermal mass

ELECTRA-flo/S5-CM Thermal Airflow Measurement Station

The ELECTRA-flo/CM Thermal Airflow Measuring Station combines thermal dispersion measurement technology with an integral honeycomb cell air straightener to assure measurement accuracy within ±2-3%. The addition of the honeycomb cell air straightener is vital to obtain these degrees of accuracy under turbulent, rotating and multi-directional airflows normally present near fan inlets or discharge ducts.

Each station is accompanied by an ELECTRA-flo G5 Transmitter that provides connectivity to BACnet MS/TP or Modbus RTU networks. Two analog outputs are also available for airflow and temperature. The G5 user interface displays airflow and temperature data. It also allows for easy access to all product configuration and field characterization settings. The true dual channel G5 transmitter option has duct size and sensor point allocation set independently for two separate channels.


Air duct thermal mass

air duct thermal mass

ELECTRA-flo/SD Thermal Airflow & Temperature Measurement System

The Electra-flo/SD is an accurate, cost-effective thermal airflow measurement system specifically designed for VAV box installations and small duct applications using 4″-16″ ducts. The low flow measurement capability of the ELECTRA-flo/SD allows for reduced minimum airflow settings and increased system efficiencies while still meeting IAQ requirements. Installation and set-up are easy in both new and existing systems.


Air duct thermal mass

air duct thermal mass

VOLU-trol/E Thermal Measurement and Control Station

The VOLU-trol/E Measurement and Control Station with ELECTRA-flo Transmitter utilizes the ELECTRA-flo Thermal Dispersion sensing technology to continuously measure and control ducted airflow. The combination of the integrated honeycomb cell air straightener/equalizer, precision sensor locations, pneumatic averaging of a large number of sensed airflow pressures and the symmetrical averaging assure and accuracy of ±2% or better. The flexible design has no size or capacity limits and makes the VOLU-trol/E well suited to VAV applications where noise control and installed system cost are important.


Air duct thermal mass

air duct thermal mass

ELECTRA-flo/FI Thermal Dispersion Fan Inlet Probe Array

The ELECTRA-flo/FI Thermal Fan Inlet Airflow Probe utilizes dual point thermal dispersion technology sensors installed in the fan’s inlet bell mouth at the throat. Aerodynamic sensor apertures, assisted by the air processing effect of the nozzle-shaped fan inlet, provide accurate measurement for most fan types. Readings are taken at the measurement point, not calculated at the transmitter. This allows for daisy-chaining multiple units together which reduces cabling. Anodized aluminum sensor housings and stainless steel adjustable support struts are both durable and easy to install. ELECTRA-flo sensors are factory calibrated to NIST traceable standards, and each fan inlet assembly comes complete with an ELECTRA-flo transmitter for local data display, performing configuration and calibration, and to provide analog outputs of airflow and temperature.


Air duct differential pressure

Air duct differential pressure

FAN-E Pitot Airflow Measurement Traverse Station

The FAN-E Station is a multi-point, self-averaging Pitot traverse station with an integral air straightening honeycomb cell. It’s capable of continuously measuring fan discharges or ducted airflow with a certified accuracy of ±2% when tested according to AMCA Standard 610. The high degree of accuracy is a result of the sensor locations and sensing ports, the honeycomb airflow processing and the instantaneous pneumatic averaging of multiple pressure values. The FAN-E Station is designed for applications with very limited straight duct runs and/or highly disturbed airflow. Patent No. 3,748,901.


Air duct differential pressure

Air duct differential pressure

FAN-E Pitot Airflow Measurement Traverse Station

The FAN-E Station is a multi-point, self-averaging Pitot traverse station with an integral air straightening honeycomb cell. It’s capable of continuously measuring fan discharges or ducted airflow with a certified accuracy of ±2% when tested according to AMCA Standard 610. The high degree of accuracy is a result of the sensor locations and sensing ports, the honeycomb airflow processing and the instantaneous pneumatic averaging of multiple pressure values. The FAN-E Station is designed for applications with very limited straight duct runs and/or highly disturbed airflow. Patent No. 3,748,901.


Air duct differential pressure

Air duct differential pressure

Aluminum LO-flo Pitot Airflow Measurement Traverse Station

Air Monitor’s Aluminum LO-flo Pitot Traverse Station is a flow traverse station that combines honeycomb air straightener-equalizer with proven multi-point, self-averaging Pitot technology. The Aluminum LO-flo provides the means of measuring low air volumes of 35 to 1700 CFM in small diameter round ducts between 4″ – 8″, accurate within ±2% of actual airflow.


Air duct differential pressure

Air duct differential pressure

VOLU-probe/VS Pitot Airflow Measurement Traverse Station

The VOLU-probe/VS Station utilizes one or more VOLU-probes, factory mounted in a rigid, welded, galvanized casing to sense and average separate total and static pressure traverses of an air stream. The station has a certified accuracy of ± 2% when tested in accordance with AMCA Standard 610. Each probe contains multiple sets of Pitot sensing ports positioned equidistant along the length of the probe. They traverse the duct cross-section and average the sensed pressures in separate internal manifolds. The VOLU-probe/VS Station is designed for applications with limited straight duct runs and/or moderately disturbed airflow. AMCA Certified in accordance with Standard 610. Patent No. 4,559,835.


Air duct differential pressure

Air duct differential pressure

VOLU-trol/F Measurement and Control Station

The VOLU-trol/F Measurement and Control Station utilizes the VOLU-probe Pitot sensing technology to continuously measure and control ducted airflow. The combination of the integrated honeycomb cell air straightener/equalizer, precision sensor locations, pneumatic averaging of a large number of sensed airflow pressures and the patented symmetrical averaging assure an accuracy of ±2% or better. The flexible design has no size or capacity limits and makes the VOLU-trol/F well suited to VAV applications where noise control and installed system cost are important. Patent No. 3,685,355.


Air duct differential pressure

Air duct differential pressure

VOLU-probe Pitot Airflow Measurement Traverse Probe

The VOLU-probe Airflow Traverse Probes consist of multiple Pitot total and static pressure sensing ports positioned along the length of each probe to traverse the duct cross-section. They average the sensed pressures in their separate internal manifolds and provide velocity pressure measurement accurate to within 2-3% of actual flow.


Air duct differential pressure

Air duct differential pressure

VOLU-probe/FI Pitot Fan Inlet Airflow Traverse Station

The VOLU-probe/FI Fan Inlet Airflow Probe consists of a pair of offset mounted traverse probes that are installed directly in the fan’s inlet bell mouth at the throat. The VOLU-probe combines the air processing effect of the nozzle-shaped fan inlet with the multi-point, self-averaging Pitot tubes to accurately measure inlet velocity pressure and calculable air volume with an accuracy of ±3% for most fan types. Available in both aluminum and stainless steel. Patent No. 3,733,900.


Yes, You Can
Accurately Measure Outdoor Airflow!
Onicon Measurement Video