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Black phenolic case vacuum gauge with white dial and glass lens

Ashcroft

Ashcroft 451279SS04LXLLVAC Process Vacuum Gauge +/-0.5% 30 to 0 Black

SKU CH-H8G7-18K9M

Measures vacuum from 30 to 0 with ±0.5% accuracy in a 4 1/2 inch phenolic case

  • TypeElectronic
  • +/-0.5 % accuracy gives reliable vacuum readings
  • 30 to 0 range covers full vacuum scale
  • 4 1/2 in dial shows clear measurements
  • Phenolic case resists harsh process environments
  • Dry PLUS! dampening protects against vibration damage

Ashcroft 451279SS04LXLLVAC Vacuum Gauge

The Ashcroft 451279SS04LXLLVAC is an electronic process vacuum gauge built for industrial monitoring. It measures vacuum from 30 to 0 with an accuracy of +/-0.5 percent. The phenolic case and glass lens resist harsh environments while the dry PLUS! Performance system dampens vibration without liquid fill. A 1/2 inch male NPT bottom connection fits standard process piping.

Suits technicians needing reliable vacuum readings

This gauge serves plant engineers and maintenance crews who require precise vacuum measurement on pumps, filters or process lines. The dry vibration-dampened design eliminates leak risk from fill fluid. Buyers who need a gauge rated for hazardous locations or an IP-rated enclosure should look elsewhere because this model carries no IP or NEMA rating. It is also not field fillable so users cannot add damping fluid later.

Handles 30 to 0 vacuum range

The instrument comfortably covers full vacuum to atmospheric pressure in HVAC evacuation, degassing chambers and suction line testing. Accuracy holds at +/-0.5 percent across the scale so critical set-points remain trustworthy. The dry case runs out of protection in wet or wash-down areas because it lacks an IP rating. The fixed 1/2 inch NPT connection limits use where other thread standards or flange mounts are required.

Highlights

  • +/-0.5 % accuracy gives reliable vacuum readings
  • 30 to 0 range covers full vacuum scale
  • 4 1/2 in dial shows clear measurements
  • Phenolic case resists harsh process environments
  • Dry PLUS! dampening protects against vibration damage

Specifications

BrandASHCROFT
TypeElectronic

Questions about this item

What process connection size and type must my system have for the 451279 gauge to install directly?

The gauge uses a 1/2 in male NPT bottom connection, so your system needs a matching 1/2 in female NPT port.

Will the 4 1/2 in dial and PLUS! Performance dampening still read clearly on older equipment that vibrates?

Yes, the dry vibration-dampened case and PLUS! Performance feature are designed to keep the white dial readable on vibrating machinery.

How can I confirm the gauge is operating within its stated +/-0.5% accuracy after installation?

Apply a known vacuum reference at the 30 to 0 range and verify the pointer stays within half a percent of full scale.

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