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Black 4 1/2 inch process pressure gauge with glass lens and white dial

Ashcroft

Ashcroft 451259 Process Pressure Gauge 0 to 400 psi 4 1/2 in

SKU CH-4N6Z-Z68TH

Measures process pressure from 0 to 400 psi with ±0.5% accuracy on a 4½ in dial

  • TypeElectronic
  • +/- 0.5% accuracy for precise readings
  • 0 to 400 psi range covers broad applications
  • 4-1/2 inch dial enables clear visibility
  • PBT case material resists harsh environments
  • 1/2 inch NPT male connection ensures secure fit

Ashcroft 451259 Process Pressure Gauge

The Ashcroft 451259 is a process pressure gauge built for industrial monitoring where precise readings are required. It covers a primary pressure range of 0 to 400 psi with an accuracy of +/- .5 percent. The 4 1/2 in nominal dial size features a white dial behind a glass lens for clear visibility. A 1/2 in male NPT bottom connection integrates directly into compatible process piping.

Upgrading from lower accuracy gauges

This gauge replaces instruments with wider error bands when a +/- .5 percent tolerance becomes necessary for quality control or safety compliance. The jump is worth it when process specifications demand tighter pressure verification than general-purpose models can deliver. Its dry dampening feature means it suits steady pressure media without pulsation. Buyers who need vibration resistance or liquid-filled dampening for dynamic systems should look elsewhere.

Sustained load behaviour

Under continuous process pressure the PBT case maintains structural integrity while the glass lens resists chemical attack. The field fillable design is not available on this model so the dry case remains sealed for the service life. Without a vibration resistance rating the gauge is intended for stable mounting locations away from mechanical shock. The IP rating is not rated so additional enclosure may be required in wash-down or outdoor environments.

Highlights

  • +/- 0.5% accuracy for precise readings
  • 0 to 400 psi range covers broad applications
  • 4-1/2 inch dial enables clear visibility
  • PBT case material resists harsh environments
  • 1/2 inch NPT male connection ensures secure fit

Specifications

BrandASHCROFT
TypeElectronic

Questions about this item

What size NPT thread does the 1/2 in process connection use?

The gauge has a male 1/2 in NPT bottom connection that threads directly into a matching female port.

Which way should the 4 1/2 in dial face when I thread the gauge into a vertical pipe?

Because the connection is fixed at the bottom, the dial will point outward; use a swivel adapter if you need a different orientation.

Can I add liquid fill to the Ashcroft 451259 case later if vibration becomes a problem?

No, the case is marked as not field fillable, so you would need to replace it with a fillable model instead.

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