Wednesday, November 22, 2017

Halton PRA adjustment and measurement units

halton ravenscroft praRavenscroft supplies Halton PRA airflow balancing, adjustment and measurement units.

PRAs provide accurate airflow measurements based on flow nozzle principle, and operate in temperatures ranging from -30 °C to +70 °C. Their conical adjustment section ensures minimised sound generation.

Halton PRAs can also be used as supply air jet nozzle for air diffusion in large spaces.

The PRA units are easy to maintain, as they can be manually adjusted without the need for any tools. Helpful adjustment position marker indicates proper position, e.g. easing repositioning after cleaning. PRAs feature a self-locking adjustment mechanism where position can be ensured with locking screw.

Halton PTS control and adjustment damper

halton ravenscroft ptsThe PTS unit can operate as a shut-off, control or adjustment damper depending on the product model. This damper is available for circular standard duct sizes 100 mm to 500 mm. Damper position is visually indicated below the operating mechanism.

The PTS/A is a shut-off damper of leakage class 4 according to the EN 1751 standard. It includes rubber gaskets to ensure low leakage flow when the damper is in closed position. The PTS/A is available with a handle for manual operation or with an electric actuator for on-off control or for modulating control using a 0...10 VDC control signal.

The PTS/B can be used for airflow control or adjustment of airflow rates in the ductwork. It includes a steel blade without gasket. Like the PTS/A, the PTS/B can be used manually or with a electric actuator.

The PTS/C is an airflow adjustment damper. The damper blade is a perforated blade that is acoustically and operationally designed for balancing of airflow rates.

Halton MSD airflow measurement units

halton ravenscroft msdRavenscroft supplies Halton MSD airflow measurement units, which are based on differential pressure created by measurement probe pipes. The corresponding airflow rate can be defined by measuring the pressure difference sensed by the two crossing sets of averaging probes. MSD units prove very accurate measurement, inaccuracy less that ±10 %.

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