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Ashcroft 4 1/2 inch dial pressure gauge black aluminum case glass lens white face IP66 NEMA 4X 0 to 400 psi bottom connection

Ashcroft

Ashcroft 451379 Process Pressure Gauge 0-400 psi 4 1/2 in Dial

SKU CH-X71J-K7WCT

Process pressure gauge with 4 1/2 in dial measuring 0 to 400 psi, ±0.5% accuracy, IP66 and NEMA 4X rated aluminum case, 1/2 in NPT male bottom connection, glass lens.

  • Color and finishBlack
  • Product typeElectronic
  • +/- 0.5% accuracy for reliable readings
  • IP66 and NEMA 4X rating resists dust and water
  • 4 1/2 in dial gives clear visibility
  • Liquid-filled case dampens vibration effects
  • 1/2 in NPT male bottom connection installs directly

Ashcroft 451379 Process Gauge

The Ashcroft 451379 is a process pressure gauge built for industrial monitoring where reliable readings matter. It suits plant engineers and maintenance teams who need a 4 1/2 in dial with a 0 to 400 psi range for steam, water or compatible process fluids. The aluminium case and IP66 NEMA 4X rating allow installation in wash-down areas and harsh ambient conditions. Field-fillable liquid dampening can be added on site to reduce pointer vibration.

Thermals Noise Power

The mechanical gauge draws no electrical power and produces no audible noise during operation. Liquid filling, when added by the user, suppresses pointer flutter caused by pump pulsation or pipeline vibration without any external energy source. The glass lens and aluminium case withstand temperature swings typical of process environments while maintaining the stated accuracy. No wiring, batteries or cooling considerations are required for normal use.

Upgrade Path

This gauge replaces worn or inaccurate analogue instruments on existing 1/2 in NPT male bottom connections without re-piping. The jump is worth it when the current device lacks IP66 protection, has a smaller dial that is hard to read at distance, or cannot be liquid-filled in the field for vibration resistance. Buyers who need electronic output, data logging or a different pressure range will not be served by this model.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $129.99
Pricier than about 69% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameASHCROFT
Color and finishBlack
Product typeElectronic

Questions about this item

How do I install the 1/2 in NPT male connection on this gauge, and what is the common mistake?

Thread the 1/2 in NPT male process connection into the matching female port using PTFE tape or pipe sealant on the threads; the step often missed is orienting the bottom-mounted case so the 4 1/2 in dial faces the operator before final tightening.

What maintenance will the liquid-filled vibration resistance and field-fillable case require over time?

The glycerine or silicone fill dampens vibration; if the fluid discolours or leaks, the case can be refilled in the field through the fill plug — check the glass lens and IP66 seal during routine inspection.

At what pressure does the +/- 0.5 percent accuracy limit become the governing factor during sustained use?

The gauge is rated 0 to 400 psi with +/- 0.5 percent full-scale accuracy; at the top of the range the maximum error is 2 psi, so sustained readings near 400 psi are limited by this tolerance band.

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