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Ashcroft 451259 compound gauge black PBT case white dial 4 1/2 in 30 Hg to 30 psi

Ashcroft

Ashcroft 451259 compound gauge 30 Hg to 30 psi 4 1/2 in

SKU CH-9WER-JX5BE

Measures vacuum to 30 inHg and pressure to 30 psi with ±0.5 % accuracy on a 4 1/2 in dial

  • Color/FinishBlack
  • TypeElectronic
  • ±0.5 % accuracy for precise readings
  • 4 1/2 in dial for clear visibility
  • 30 Hg to 30 psi range covers vacuum and pressure
  • PBT case resists chemicals and impact
  • 1/2 in NPT bottom connection for direct mounting

Ashcroft 4 1/2 in compound gauge

The Ashcroft 451259 compound gauge measures vacuum and pressure on a single white dial. It covers a range of 30 Hg to 30 psi with an accuracy of ±0.5 percent. The black PBT case houses a glass lens and a 1/2 in male NPT bottom connection. This new instrument suits technicians who need reliable process monitoring.

Upgrade from smaller or uncalibrated gauges

Replace analogue gauges that lack the 4 1/2 in dial clarity or the stated ±0.5 percent accuracy class. The jump is worth it when procedures demand documented calibration traceability and a single instrument for both vacuum and positive pressure. It is not for installers who require a field-fillable case or built-in vibration dampening.

Capacity and headroom for process monitoring

The dual-scale span comfortably handles HVAC evacuation, leak testing and low-pressure pneumatic systems up to 30 psi. Headroom runs out above the 30 psi upper limit or in applications needing IP-rated sealing. The dry movement has no liquid dampening, so sustained pulsation will exceed the gauge's vibration resistance.

Highlights

  • ±0.5 % accuracy for precise readings
  • 4 1/2 in dial for clear visibility
  • 30 Hg to 30 psi range covers vacuum and pressure
  • PBT case resists chemicals and impact
  • 1/2 in NPT bottom connection for direct mounting

Specifications

BrandASHCROFT
Color/FinishBlack
TypeElectronic

Questions about this item

What size NPT thread does the 1/2 in process connection on the Ashcroft 451259 use?

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

Which way should the glass lens face when I mount the 4 1/2 in dial?

Install the gauge with the dial vertical and the lens facing outward so the white face and black pointer are readable.

Can the Ashcroft 451259 be filled with glycerin later if vibration increases?

No, the case is marked non-field-fillable and has no dry dampening feature, so liquid cannot be added after installation.

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