We originally sold this unit as a differential low pressure switch with digital display. However, it can be used as a manometer having an accuracy of +/-0.5% of full scale. It sells at one half the price of other manometers on the market and also provides control circuits for switching. We will provide, at no extra charge, brackets that allow it to be placed on a horizontal surface and equip it with a line cord so it can be used as a measuring instrument. Normally the unit is mounted on a vertical surface.

This unit can be used as a sensor to detect forced entry of yachts, buildings, etc. All that is necessary is to use a small blower to create a slight positive pressure. When a window is opened three inches the Model 190 will detect the drop in pressure with no time delay and activate an alarm. It can also be used as a pressurization monitor for clean rooms.