WBA208 Precision Pneumatic Input Signal Amplifier

Precision Pneumatic Input Signal Amplifier     1/4" – Basic 1/4" Body

Features
• The WBA208 uses a pneumatic input signal to accurately control output pressure based on a predetermined ratio.
• A balanced Supply Valve minimizes the effects of supply pressure variation.
• An Aspirator Tube compensates downstream pressure droop under flowingconditions.
• Optional Adjustable By-Pass Needle Valve allows tuning for optimum dynamic response (1:1 ratio only).
• Optional Fixed Negative Bias allows operation with pneumatic devices that cannot be adjusted to zero input pressure.
• A separate Control Chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing.
• Unit construction allows servicing without removal.
• Mounting Bracket available.

Operating Principles
The WBA208 Input Signal Amplifier is a pneumatic device capable of high flow and exhaust capacity. This device uses a force balance system to control the movement of the supply and exhaust valves. At set point, the force due to signal pressure that acts on the top of the Upper Diaphragm balances with the force due to output pressure acting on the bottom of the Lower Diaphragm.