This pressure switch can be used to sense the pressure difference between the pipe and the air is poor, General applications include: 1. Monitoring the filter blocking alarm device 2. Monitoring the air conditioning unit in the fan start / stop status of 3. Heating and ventilation ducts in the gas monitoring 4. control the largest variable air volume systems gas 5. combustion furnace gas control 



 Technical parameters 
 Wiring diagram 
 Model Description 



 Range: 
 SP33A-30: 30Pa ~ 300Pa 
 SP33A-100: 100Pa ~ 500Pa 
 Maximum media pressure: 7500Pa 
 Medium temperature limits: -15 / +60 ℃ 
 Protection class: IP54 
 Electrical Rating: 2A 220VAC 


 Wiring diagram 



 Note: 
 1. If the pressure switch installation did not follow the above instructions, the two ports down, then the switch point detection bias pressure to 20Pa, mainly by the pressure 
 The principle difference between the decision switch (pressure switch has a very thin film is divided into two internal cavity, if the film is not vertically but the water 
 Level installation, the film's own weight will affect the gas pressure difference). 
 2. To avoid electric shock or damage to equipment, remove the cover should be sure the power switch is turned off. 
 3. Wires should be completed before use and check the connection status. Incorrect connection may cause permanent damage to the device. 
 4. In the low current (0.1A or less) cases, the voltage less than 30V, the proposed circuit is connected to a RC network. 
 5. Use before the installation of plastic pipe with holes to play, and "Z type" bracket installed in the field (standard configuration). 
 6. To ensure minimum or no vibration mounting surface vibration, the switch can be directly fixed to the pipe, heater, or panel. 
 7. Mark the location of pressure connection: + (high) and - (low pressure or static pressure). 



 Model Description 



 Switch schematic: 


 The actual pressure is less than set value, the contacts 1-2 conduction. 
 The actual pressure is greater than set value, the contacts 1-3 conduction. 

 Installation: 
 1. Installed in the position of minimal vibration 
 2. SP33A factory calibrated at room temperature, preferably also installed near room temperature 
 3. High humidity condensation may occur in the system and, therefore, downward pressure switch should be installed nozzle