Research Laboratory Components
Sash Position sensing uses simple and well-proven technology to communicate the position of a sash to a controller. The controller outputs a signal to the exhaust valve changing the air flow rate to maintain the preset face velocity. (See Bulletin 873-b)
Fume Hood Monitor with Local Controller
The face velocity monitor will measure and display the actual flow rate into a hood by means of an integral side wall sensor. Additionally, there are high and low alarms, night setback, and an emergency purge with an alarm. There are three LEDs which will indicate system performance. (See Bullentin 873-a)
The space controller accepts analog signals from a sash monitor, a face velocity monitor, or both. It compares these signals to either an air flow valve or a dedicated fan. The controller can be programmed in the factory or in the field for Constant Volume, Variable Volume Flow, Pressure Offset, or Volumetric Offset. (See Bulletin 874)
The Tubular Valve is designed for spaces requiring a compact valve and a need for either electronic or pressure actuation. The performance is linear and with minimal hysteresis. This allows several valves of different sizes to serve one space and maintain space pressures at all times. (See Bulletin 814)
This pneumatically actuated valve is a dependable and time proven product for accurate and repetitive control over space pressure and flow rates. The airfoil blades assure linear control at all points of modulation. The valve is used extensively in research laboratories and clean spaces as well as in pharmaceutical facilities.(See Bulletin 810)
The Waddell space or room sensor is designed to eliminate any random room currents and provide a stable static pressure signal during minimum and maximum flow rates. An internal secondary chamber buffers these space pressure spikes. This sensor should be used with an accurate very low pressure transmitter. (See Bulletin 864)