PENN COMMERCIAL REFRIGERATION
PRESSURE CONTROLS
ADJUSTABLE DIFFERENTIAL PRESSURE SWITCH
P232
SENSITIVE DIFFERENTIAL
This switch senses a change in the differential pressure ( either velocity pressure or pressure drop across a restriction ) as the air flow changes . The pressure , as sensed by two sensing ports , is applied to the two sides of a diaphragm in the control . The spring loaded diaphragm moves and actuates the switch .
The series P232 can also be used to detect small positive gauge pressure by using only the high pressure connection and leaving the low pressure connector open , or to detect a vacuum by using only the low pressure connection and leaving the high pressure connector open to ambient pressure .
FEATURES
• Easy to read setpoint scale
• Large wiring space
• Versatile mounting options
APPLICATION
■ This ( differential ) pressure switch is used to sense flow of air , single or differential air pressure
Typical applications include :
■ Clogged filter detection
■ Detection of frost on air conditioning coils and initiation of defrost cycle
■ Air proving in heating or ventilation ducts
■ Maximum air flow controller for variable air volume system
31 - REFRIGERATION
European Products Catalogue 2021