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Ashcroft 4 1/2 inch compound gauge black aluminum case white dial glass lens bottom connection

Ashcroft

Ashcroft 451379 Process Compound Gauge 30 to 0 to 30 psi 4 1/2 in

SKU CH-8RVA-2D1QG

Measures vacuum to 30 psi and pressure to 30 psi with ±0.5% accuracy on a 4½ in IP66-rated aluminium case

  • Product typeElectronic
  • +/- 0.5% accuracy for precise pressure readings
  • IP66 and NEMA 4X rating protects against dust and water ingress
  • 4 1/2 in dial with white face for clear visibility
  • 30 to 0 to 30 psi compound range measures vacuum and pressure
  • 1/2 in NPT male bottom connection for standard mounting

Ashcroft 451379 Compound Gauge

The Ashcroft 451379 is a process compound gauge built for technicians who measure vacuum and pressure in one instrument. Its 4 1/2 inch dial shows a range from 30 to 0 to 30 psi with an accuracy of ±0.5 percent. The aluminum case carries an IP66 and NEMA 4X rating for harsh environments.

Practical Limits of the NPT Connection

The gauge uses a 1/2 inch male NPT bottom connection that threads directly into compatible process ports. A glass lens protects the white dial while the case is field fillable for liquid damping when vibration resistance is required. No dry dampening feature is included.

Replaces Single Range Gauges

This compound gauge replaces separate vacuum and pressure gauges on systems that swing between both conditions. The jump is worth it when a single 4 1/2 inch instrument simplifies panel layout and reduces potential leak points.

How it compares

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

Price $99.99
Pricier than about 64% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameASHCROFT
Product typeElectronic

Questions about this item

Which pressure range should I select for a 30 to 0 to 30 psi application?

The gauge covers a compound range of 30 to 0 to 30 psi, so a single unit handles both vacuum and positive pressure up to 30 psi.

What does the ±0.5 percent accuracy mean when the gauge is installed?

At full scale the reading can deviate by up to half a percent of the 30 psi span.

What does the NPT 1/2 in male connection limit in practice?

The 1/2 in male NPT bottom mount fits standard NPT ports and the IP66/NEMA 4X rating seals against dust and water ingress.

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