|Challenges of Outdoor Air Flow Measurement||Pitot||Thermal||VOLU FLO / OAM|
|Extremely low velocities (150 fpm)||NO||YES||YES|
|Directional wind loads||MAYBE||MAYBE||YES|
|Large fluctuations in ambient temperature||MAYBE||YES||YES|
|Variable humidity (30-100%); condensing||YES||NO||YES|
|Presence of airborne particulate||NO||NO||YES|
|No straight duct run available||NO||NO||YES|
The OAM II is adaptable to any inlet size. It automatically provides altitude compensation and performs ambient temperature compensation. Units can be retrofitted into packaged air handlers and built up system installations without sheet metal modifications or damper replacement. For new installations, easy to install, turnkey stations can be provided. System components include the outdoor reference sensor, inlet airflow sensor and monitor module.
The Solution - The OAM II
Air Monitor Corporation has developed the OAM II to mitigate these challenges by measuring at the fan inlet where air velocity is often the highest. Each louver or intake screen is a known fixed resistance device with its own unique mathematical relationship between airflow and pressure drop. Using differential pressure technology, which measures the actual components of airflow – total pressure and static pressure – the OAM II measures the pressure drop of outside airflow against a fixed resistance (created or existing) which is unaffected by wind gusts, rain, varying humidity and airborne particulate.
OAM II measurement accuracy is +/-5% and can operate with inlet velocities as lows as 150 fpm. Each sensor is made of 316 stainless steel and provides flow and temperature outputs. Most importantly the OAM II is factory calibrated and guarantees compliance with both ASHRAE Standards 62 and 189.1.
Applications for the OAM II
|Single Louver Sensors mounted upstream and downstream of single louver||Double Louver Sensors can be mounted in a split intake with all connected back to common transmitter||Split Louver The newest OAM version requires only one transmitter for monitoring separate intakes|