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ASPS™ Sequence of Operation
(2 of 5) |
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Push Button only Automatic Sash Positioning System
for
Single Vertically Rising Sash Fume Hood
ASPS-SS-PB |
- The Automatic Sash Positioning System shall operate as follows:
- When a laboratory technician is sensed in front of the fume hood and the “Push to Open” button is activated the fume hood shall open in less than 3 seconds to a safe working height of 18 inches above countertop ±1 inch (specify for installation).
- Once the sash has risen, the laboratory technician shall be able to manually move the sash to a higher or lower position without releasing any type of sash locks.
- Once NO moving objects are sensed in front of the fume hood, the control module shall delay 60 seconds (adjustable), then slowly close the sash in less than 10 seconds.
- During sash closure, if an object is sensed in the path of the sash, the amber light illuminates and the sash stops without making contact with the object. When a laboratory technician is sensed in front of the hood and the “Push to Open” button is activated the sash will re-open allowing the removal of the object.
- Upon power or instrument air failure the sash shall be manually movable.
- Additional options for this Automatic Sash Position
System
- Object Alarm: while the amber light is
illuminated an audible alarm sounds.
- Sash Interference Dry Contact: while the
amber light is illuminated a dry contact closes
for remote monitoring by building systems.
- Automatic Fume Hood
Light: when a laboratory technician is
sensed in front of the fume hood a 10Amp SPST
dry contact will close allowing the fume hood
light to be illuminated.
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