+91-22-25126500 :: Pressure,Differential Pressure,Temperature,Level,Flow,Process Control,valves,Test Equipments

Series 1640 Floating Contact Null Switch for High and Low Actuation

The unique electric switch design in the 1640 is another Dwyer Instrument, Inc. innovation. The Dwyer® Model 1640 Differential Pressure Switch resembles the Series 1630 switches. However, the Model 1640 is equipped with a single pole, double throw floating contact switch (not snap acting) so it functions as a null switch.

Drawing shows the switching action schematically. As the diaphragm moves in response to pressure changes, it moves the floating contact to cause switching action at two preset points with no switching action between these points. The "high" circuit will be closed when rising pressure differential reaches the preset level. The "low" circuit will be closed when falling pressure differential reaches the preset level.

A typical example of usage is to position motorized dampers when static pressure in a duct system reaches a desired maximum and reposition the dampers when the static pressure falls to a pre-established minimum. By using a Pitot tube sensing element the Model 1640 switch can serve in the same way to control air velocity and maintain a constant volume of air in a supply duct.



” I would like to put on record my appreciation of the service you provide. Your prompt delivery/collection service is very useful as it minimizes equipment downtime. I have always found the work carried out to be of the highest quality. The calibration paperwork received is always clear and concise. In short it has made our compliance with quality standards easier. I would recommend your calibration service to anyone.”
“ PERFECT is the most suitable word to describe their service “

“I did the Right Choice ,cost effective,Great Service”

Slide background
Slide background
Slide background
Slide background
Dwyer Differential Pressure, Dwyer Air/Inert Gases, Dwyer Differential Pressure Gages, Dwyer Dial Gauges For Air/Inert Gases, Dwyer Controllers For Air/Inert Gases, Dwyer Data Loggers, Dwyer Switches For Air/Inert Gases, Dwyer Manometers, Dwyer Transmitters For Air/Inert Gases, Dwyer Wet/Wet Differential Pressure, Dwyer Wet/Wet Transmitters, Dwyer Wet/Wet Controllers, Dwyer Wet/Wet Dial Gauges, Dwyer Wet/Wet Switches, Dwyer Gauge/Absolute/Vacuum, Dwyer Pressure Gauges, Dwyer Digital Pressure Gauges, Dwyer Pressure Transmitters, Dwyer Pressure Switches, Dwyer Pressure Controllers, Dwyer Pressure Data Loggers, Dwyer Air QualityDwyer Air Velocity & Flow, Dwyer Air Velocity & Flow Switches, Dwyer Air Velocity & Flow Transmitters, Dwyer Air Velocity & Flow Sensors, Dwyer CO & CO2 Transmitters, Dwyer Temperature & Humidity, Dwyer Temperature & Humidity Switches, Dwyer Temperature & Humidity Transmitters, Dwyer Flow, Dwyer Flow Gauges, Dwyer Flowmeters, Dwyer Flow Sensors Dwyer Sight Flow Indicators, Dwyer Flow Switches, Dwyer Flow Transmitters, Dwyer Rotameters, Dwyer Temperature, Dwyer Temperature Controllers, Dwyer Temperature Data Loggers, Dwyer Temperature Dial Gauges, Dwyer Temperature Digital Thermometer or Indicator, Dwyer Temperature Sensors, Dwyer Temperature Switches, Dwyer Temperature Thermometers, Dwyer Temperature Thermowell, Dwyer Temperature Transmitters, Dwyer Level, Dwyer Level Controller, Dwyer Level Data Loggers, Dwyer Level Indicator, Dwyer Level Switches, Dwyer Level Transmitters, Dwyer Adjustable Differential Pressure SwitchesDwyer Vacuum Switches, Dwyer Vibration Switches, Dwyer Differential Pressure Controllers, Dwyer CO & CO2 Transmitters, Dwyer Instruments in MumbaiAerosense in Mumbai