Mid-West 105-FE-00-OO-30H Differential Pressure Gauge with Aluminum Body and Stainless Steel Internals, Bellows Type, 1% Full Scale Accuracy, 6" Dial, 1/4" FNPT Top and Bottom Connection, 0-30 IN H2O Range, 1500 psig SWP

Mid-West Instrument bellows type differential pressure gauge. Model 105 System pressure is applied to the internal volume of a bellows and mechanical linkage assembly. As pressure changes, the bellows and linkage assembly move to cause an electrical signal to be produced or to cause a gauge pointer to move. The major components are a two-piece body, multiple diaphragm/bellows sensing element and over-pressure assembly, a torque tube assembly, a range spring and the gauge front assembly. The body halves provide the pressure containment function. They also clamp the sensing element and over-pressure assembly between the halves, isolating the high side and low side pressures of the system. The high side body half also provides a mount for the torque tube assembly and the gauge front assembly. Model 105 assembly incorporates a bi-directional relief valve which provides over-pressure protection in both directions. When over-pressured from the high side, the valve is opened by a mechanical stop as the sensing element deflects to its maximum travel. When over-pressured from the low side, the spring-loaded valve opens when the differential pressure exceeds its maximum rating. The opening of the valve in either direction equalizes the pressure and protects the unit. Aluminum body material. Stainless steel internal metal part. Buna-N seal material. 1/4-inches FNPT top and bottom connections, 6-inches uni-directional round dial, weather resistant engineered plastic case, accuracy +/-1 percent full scale (ascending). Shatter resistant acrylic lens.