Series STRA Duct Mounted Airflow Measurement Station

Series STRA Duct Mounted Airflow Measurement Station

Integral Flow Straightener, Ideal for Turbulent Measuring Conditions

The Series STRA Airflow Measurement Station is easy to install -- simply connect the tubing to the station fittings, then to a differential pressure manometer, gage, transmitter or switch. Single or multiple airflow elements are factory mounted and pre-piped in a casing designed for flanged connection to the duct work. The Series STRA utilizes an airflow averaging element in a head-type device, generating a differential (velocity) pressure signal similar to the orifice, venturi, and other head producing primary elements. It has been developed with a honeycomb airflow straightening section for use in duct systems having highly turbulent conditions at the point of measurement. Strategically located sensing ports continually sample the total and static pressures when inserted normal to flow. Total pressures sensed by the upstream ports are continually averaged within the airflow element in an isolated chamber. The static sensing ports are averaged in a second isolation chamber. Multiple elements are joined together for connection to a differential measurement device (gage, transmitter, etc.) for flow measurement and indication purposes.

Specifications

• Accuracy:Within 2% of actual flow when installed in accordance with published recommendations.
• K Factor:0.97.
• Velocity Range:100 to 10,000 fpm (0.51 to 51 m/s).
• Wetted Materials:Elements: 6063-T5 anodized aluminum; Casings: 16 ga G90 galvanized steel, 3003 aluminum air flow straightener.
• Coatings:Herewith VRL 500 phenolic coating Imron 333 polyurethane enamel.
• Temperature Limits:Galvanized Casings and Aluminum Elements 350°F (177°C) continuous operation (in air), 400°F (204°C) intermittent operation (in air).
• Humidity Limits:All Airflow Stations 0 to 100% non condensing.
• Process Connections:1/4" compression fittings.

Features

• Low signal-to-noise ratio.
• Honeycomb airflow straightening section with 1/2" opening by 3" depth.
• Multiple total and static pressure sensing ports along the length of the element.
• Factory mounted and pre-piped in a flanged duct section (casing).
• ±2% accuracy throughout velocity ranges of 100 fpm and over.
• Standard construction includes galvanized casing and 6063-T5 anodized aluminum flow sensors.
• Standard airflow stations can be operated (in air) continuously in temperatures up to 350°F or intermittently in temperatures up to 400°F.
• All airflow stations can be operated in humidity ranges of 0 to 100%.
• Standard airflow stations have good salt air resistance and are suitable for most HVAC applications.
• Great for use where turbulent conditions exist.

Options

• IM - Internal Pressure Connections.
• F - (Oval Stations Only).

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