Vacuum Switch


	Vacuum Switch - 0.1 to 37.0 inch pounds Use these on Air Boxes and low vacuum lines; Never use on Brake Booster Line. This vacuum switch plays a big role in the safety operation of the HHO generator. It controls the On/Off function of the generator by sensing the presence of vacuum while the engine is running. The switch is so sensitive, ones breath is capable of operating it. Internal Construction: There are two chambers inside the switch. They are separated by a diaphragm. Movement of the diaphragm operates the switch function. Each chamber has a port to allow air in or out. If you "blow" air into a chamber, it pushes the diaphragm. If you "suck" air out of the chamber, it pulls the diaphragm. The diaphragm is connected to the "Common" switch terminal. Moving it one direction makes a connection with the Normally Open contact of the switch. Moving it in the opposite direction connects it to the Normally Closed contact. You can purchase directly from "LVD Electronics" at: MPJ.com GoldTech PS100 web site Information Direct Industries.com Worldmagnets.com Sunbees.co.kr Ebay.com

Switch - Contacts to use
Normally Open contact (12v Output voltage) Normally Closed contact Common contact (12v Input voltage)	Mounted "horizontal", with the switch "underneath", the weight of the diaphragm causes it to fall. That connects the "Common" contact - with the "Normally Closed" contact. To active the switch, apply vacuum to the "upper" chamber port. The vacuum will "suck" the diaphragm upwards. That will connect the "Common" contact with the "Normally Open" contact. This is the preferred method for mounting the switch. Connect the vacuum line to the upper chamber.

Switch - Contacts to use
Common contact (12v Input voltage) Normally Closed contact (12v Output voltage) Normally Open contact	Mounted "horizontal" with the switch "on top", the weight of the diaphragm causes it to fall. That connects the "Common" contact - with the "Normally Open" contact. To activate the switch, apply vacuum to the "upper" chamber port. The vacuum will " suck" the diaphragm upwards. That will connect the "Common" contact with the "Normally Closed" contact. Connect the vacuum line to the upper chamber.


Switch - Contacts to use
Normally Open contact (12v Output voltage) Normally Closed contact Common contact (12v Input voltage)	Mounted "vertical", the switch will be on the side. We have had many instances where the diaphragm stuck when a low vacuum was used. The switch is so sensitive, it does not take much suction to move the diaphragm. Use caution if you insist on using this mounting position. Connect the vacuum line to the chamber farthest from the switch.


	Design Flex has many switches that you can choose from. Design Flex switches Use these on Air Boxes and low vacuum lines; Never use on Brake Booster Line.


	Model PSF100A The rugged yet ultra-sensitive pressure switch incorporates a patented dual diaphragm / dual contact design offering protection against false actuation due to shock and vibration. SPST, Double-Make--Double-Break Switching Medium: Air---- Min. 0.2 Psi (Max. 10 Psi) Uses 3/16" ID tubing Electrical Connections Terminals - .187"x.020" tab-type, for use with quick disconnects. Has two different control ports one for low-the other for high pressure operation. If one port is at atmospheric pressure (i.e. open) the other will trigger the switch on pressure (high port) or vacuum(low port). If both ports are used then it will switch on the difference. Operating Voltage AC/DC - 30V or less with resistive load; 120 VAC neon lamp load. Current rating: Less than 40mA Mounting by 2-4 #2 screws. Surplus Electronics $4 Digi-key

Page Last Edited - 01/21/2014

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