Pneumatic indicator is used to activate and read pneumatic piezometers, total pressure cells, and settlement cells. The indicator shows a black or red display in the non-pressurized condition and is designed to be panel mounted. The high contrast between the flat black or red at rest condition and the pressure on display is abrupt and unmistakable. The pins, which comprise the display, are visible for 180° around the unit. In the non-pressurized condition, the array of nineteen indicator pins is concealed within the matrix of the pin guide. When the minimum operating pressure is applied to the port, the pins extend through the matrix. They will remain in the forward visible condition until the pressure is removed. The Indicator does not consume air or gas in either condition. It is non-electric and inherently explosion-proof. The Indicator offers an inexpensive, highly effective means of displaying the status of pneumatic components in a system.
Pneumatic Level Controller controls the liquid level. The level control scheme maintains a selected level in the surge tank by controlling the water flow rate leaving the vessel. Pneumatic level controller is a means for measuring the level of the stream within the vessel.