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Air Monitor OAM II Application Manual

Outdoor airflow measurement system
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OAM II
Outdoor Airflow Measuring System
Application Guide

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Summary of Contents for Air Monitor OAM II

  • Page 1 OAM II Outdoor Airflow Measuring System Application Guide...
  • Page 2 There are a variety of inlet types. The most common inlets incorporate architectural louvers or packaged roof top units with single or multiple rain hoods. The OAM II utilizes the static differential pressure field created by the air entering and moving through the fixed inlet. The differential pressure required to achieve accurate airflow measurement is indicated in the graph below.
  • Page 3 OAM II APPLICATION GUIDE SECTION 2.0 The OAM II can be factory configured to operate in three different modes. CONFIGURATIONS Single Channel, Single System Airflow Measurement – This configuration provides airflow measurement from 150 to 2400 FPM. It is ideal for measuring highly variable airflow in a single inlet.
  • Page 4 If the louver manufacturer, model number, net free area and free area velocity vs. pressure drop information is provided, Air Monitor will factory characterize the OAM II transmitter. This will eliminate the need for field characterization.
  • Page 5 Minimum/Economizer (Split) Inlets: In the installation below, two inlets separately provide minimum and economizer outside airflows to a single air handler. The OAM II, operating in a dual channel, single system configuration would provide both individual and totalized airflow rate information.
  • Page 6 OAM II Stations or expanded metal screens installed in ducts should be located such that there is no interference upstream or downstream that would intrude into the OAM II station casing or into the area where the uni-sensor is installed. OAM II STATION...
  • Page 7 7’ x 4’ area. SECTION 4.0 OAM II Stations are built to order and are delivered fully assembled. The number AIRFLOW STATIONS of sensors provided varies based on the size and shape of the station. When multiple OAM II stations are provided for a single system, only one station will include an RTD temperature sensor.
  • Page 8 Uni-sensors are ideal for retrofit installations because they are easily mounted to a variety of existing inlet types. IMPORTANT NOTE Air Monitor’s OAM II system is provided with an easy-to-use field characterization program. Test and balance flow data is entered, automatically adjusting the factory OAM II response curve. Field characterization is recommended for those installations where the inlet type is not fully defined at the factory.

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