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Black phenolic pressure gauge with 4-1/2 inch dial showing 0 to 100 psi bottom connection

Ashcroft

Ashcroft 451279 Pressure Gauge 0 to 100 psi 4-1/2 in

SKU CH-JBRZ-9XS2H

Measures 0 to 100 psi with ±0.50 % accuracy in a 4 1/2 in phenolic case

  • TypeElectronic
  • Accurate readings with ±0.50% full-scale precision
  • Clear 4-1/2 inch dial with 1 psi graduations
  • Corrosion-resistant stainless steel wetted parts
  • Durable phenolic case withstands harsh environments
  • Flexible 1/2 inch NPT bottom mounting option

Purpose-built pressure gauge

The Ashcroft 451279 is a 4-1/2 inch electronic process gauge designed for professionals who need accurate readings up to 100 psi. Its phenolic thermoplastic case and stainless steel wetted parts suit industrial environments where durability and chemical compatibility matter. The bottom-mounted 1/2 in MNPT connection allows direct installation on process lines.

Steady operation without liquid fill

This dry gauge eliminates the maintenance and leak risk associated with liquid-filled models while maintaining a +/- 0.50 percent accuracy across the 0 to 100 psi range. Numbered graduations every 10 psi and a smallest graduation of 1 psi support quick, precise visual checks during normal monitoring tasks. No power supply or signal conditioning is required for basic operation.

Replaces worn analogue gauges on existing panels

The surface-mount design fits standard panel cutouts, letting technicians swap out ageing or damaged units without reworking the panel. The jump is worthwhile when the old gauge has drifted beyond tolerance, when liquid fill has discoloured or leaked, or when a stainless steel wetted path is needed for the process media. Buyers who require a calibration certificate or liquid damping should look elsewhere.

Highlights

  • Accurate readings with ±0.50% full-scale precision
  • Clear 4-1/2 inch dial with 1 psi graduations
  • Corrosion-resistant stainless steel wetted parts
  • Durable phenolic case withstands harsh environments
  • Flexible 1/2 inch NPT bottom mounting option

Specifications

BrandASHCROFT
TypeElectronic

Questions about this item

How do I install the 451279 gauge with its 1/2 in MNPT bottom connection, and what step is often missed?

Thread the 1/2 in MNPT fitting into the process port using PTFE tape on the male threads, then tighten with a wrench on the hexagonal flats only; the step often missed is leaving the case unstrained so the phenolic housing does not crack.

What maintenance will the 451279 need over time?

Because the gauge is not liquid filled, the stainless steel wetted parts and phenolic case should be inspected periodically for corrosion or cracking, and the pointer zero checked against a known reference; recalibrate if drift exceeds the stated .50 percent accuracy.

What limit appears first when the 451279 runs continuously at the top of its 0 to 100 psi range?

Sustained operation at 100 psi subjects the stainless steel bourdon tube to maximum stress, so the .50 percent accuracy spec is the first limit reached before any case or connection failure.

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