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Black aluminum test pressure gauge with 4 1/2 in white mirror-band dial, glass lens, bottom 1/4 in NPT connection

Ashcroft

Ashcroft 451082AS02L400C4 test pressure gauge 0-400 psi 4 1/2 in dial 1/4 in NPT

SKU CH-CZ5Z-W1A73

Measures pressure up to 400 psi with ±0.25% accuracy on a 4.875 in panel-mount dial

  • ColorBlack
  • ±0.25 % accuracy for precise calibration
  • 0–400 psi range covers wide test needs
  • 4 1/2 in dial with mirror band eases reading
  • ¼ in NPT male bottom connection fits standard ports
  • Aluminium case with glass lens resists workshop wear

Ashcroft 451082 test pressure gauge

The Ashcroft 451082 test pressure gauge measures pressure from 0 to 400 psi with a 4 1/2 inch dial. It connects via a 1/4 inch male NPT bottom connection. The aluminum case and glass lens suit panel mounting with a 4.875 inch cut-out. Accuracy is rated at +/- 0.25 percent of span.

Thermals noise and power draw

This mechanical gauge operates without external power, so it produces no heat and no audible noise. The aluminum case dissipates any ambient temperature change passively. No electrical supply or cooling is required for normal operation.

Bundled accessories and software

The gauge ships as a standalone instrument with no additional fittings, tubing, or calibration software included. The mirror-band dial aids parallax-free reading without extra tools. Users must supply their own thread sealant and mounting hardware for the 1/4 inch NPT connection.

Highlights

  • ±0.25 % accuracy for precise calibration
  • 0–400 psi range covers wide test needs
  • 4 1/2 in dial with mirror band eases reading
  • ¼ in NPT male bottom connection fits standard ports
  • Aluminium case with glass lens resists workshop wear

Specifications

ColorBlack
BrandASHCROFT

Questions about this item

How do I mount the 4 1/2 in dial test pressure gauge into a panel cut-out?

Cut a 4.875 in diameter hole in the panel. Align the gauge case so the bolt circle diameter of 5.375 in matches the mounting holes. Secure with bolts through the flange; the bottom 1/4 in NPT connection remains accessible for piping.

What maintenance does the glass lens and aluminum case require over time?

Clean the glass lens with a soft cloth and mild detergent to maintain readability of the white dial with mirror-band. Inspect the aluminum case for corrosion or damage periodically. The gauge is not field fillable, so no fluid replenishment is needed.

At what pressure does the +/- 0.25 percent accuracy limit become critical during sustained use?

The accuracy specification of +/- 0.25 percent applies across the full 0 to 400 psi range. At 400 psi the maximum error is 1 psi. Sustained operation near the upper limit does not change the stated tolerance, but continuous cycling at high pressure may accelerate wear on the bourdon tube.

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