Differential pressure gauge 74

analogthreadedstainless steel

The pressure gauge is build in a stainless steel house and is filled with glycerin for reliable operation and long life. The seal between the plastic window and the housing prevents leakage by means of a bayonet catch with a rubber ring. A connection nipple is fixed to the housing in a unique way making external connection screws unnecessary. This gives an extra protection against leakage caused by vibrations. Pressure changes that can occur due to temperature differences of the glycerin are automatically compensated by the special bellows. A safety blow-out plug is located on top of the unit holding. As measuring element of phosphor, bronze is encased in an elastic bourdon tube, soldered to a large brass junction. The measuring element is thermally and mechanically protected. This allows an over pressure of 25% of the range. At ranges below 600 mBar a low pressure spring box is used. In that case the pressure gauge is supplied dry (without glycerin). As standard a dial according to EN 837 is mounted, but on request other dials are also available like a BAR/PSI dial. Often the dial is provided with your company logo. See also, R75 for Freon systems or A75 for Ammonia systems.