Ashcroft 451279 Process Pressure Gauge 0-200 psi 4 1/2 in

Purpose & User

The Ashcroft 451279 is a process pressure gauge built for industrial monitoring where reliable readings are required. It suits plant engineers, maintenance technicians and instrument specialists who need a durable instrument for stationary installations. The phenolic case and glass lens resist harsh environments, while the 4 1/2 in dial provides clear visibility at a distance. Buyers seeking a compact panel meter or a portable digital alternative should consider other product types.

Compatibility Check

Verify that the process connection matches your piping: the gauge uses a 1/2 in male NPT thread at the bottom. Ensure the system pressure stays within the 0 to 200 psi range to maintain the stated +/- 0.5 percent accuracy. The bolt circle diameter is 5.375 in, so confirm the mounting surface accommodates this pattern. The unit is not field fillable and carries no IP or NEMA rating, so it must be installed in a protected location.

Build & Daily Use

The black phenolic case resists chemicals and impact better than standard metal housings, while the glass lens resists scratching during routine cleaning. A white dial with black graduations gives high contrast in typical plant lighting. With no liquid dampening or vibration resistance, the pointer may flutter on pulsating lines; a snubber or valve may be needed. Bottom connection orientation simplifies installation on horizontal pipe runs.