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GA138-03 - Smith Equipment 2" Regulator Gauge, 0-400 PSI Delivery, 1/4" NPT

Packaging: 1 per ea
$42.28/ea $41.22/1 per ea only $41.22/eaSave 3%

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SKU: MILGA138-03 Categories: ,

OVERVIEW

Technical Overview of the Smith GA138-03 Replacement Gauge

The Smith Equipment GA138-03 is a high-quality replacement pressure gauge designed for industrial gas regulators. Engineered to meet Smith's rigid quality standards, this gauge provides a reliable solution for monitoring delivery pressure in welding, cutting, and heating applications. The unit features a dual-scale dial face that displays pressure in both Pounds Per Square Inch (PSIG) and Bar, with a range of 0-400 PSIG and 0-28 BAR respectively. This range is typically utilized for the delivery (low pressure) side of heavy-duty oxygen or inert gas regulators, or potentially for specific high-pressure applications depending on the equipment configuration.

Construction-wise, the GA138-03 is built for the harsh environment of metalworking shops. It houses a precision watch-type movement within a durable steel case, ensuring consistent accuracy and longevity. The internal mechanism is protected by a one-piece polycarbonate crystal. This crystal is not only shatter-resistant but also features a protective lip designed to prevent damage to the gauge face if the regulator is tipped or impacted. The inlet connection is a standard 1/4-inch Male National Pipe Thread (MNPT) brass nipple, located at the bottom of the case, making it compatible with the vast majority of industrial gas pressure regulators on the market that utilize 1/4-inch FNPT gauge ports.

Safety and compliance are paramount in high-pressure gas equipment. The Smith GA138-03 is U.L. Listed, verifying that it meets specific safety standards for compressed gas service. The high-visibility cupped steel face ensures that operators can easily read pressure settings from a distance, reducing the risk of error. Whether replacing a damaged gauge on a Smith regulator or another major brand, this component offers a seamless fit and reliable performance.

Key Specifications

  • Model: GA138-03
  • Pressure Range: 0-400 PSIG (0-28 BAR)
  • Diameter: 2 Inches (51mm)
  • Connection: 1/4" MNPT (Brass)
  • Case: Painted Steel
  • Lens: Shatterproof Polycarbonate
Additional Information
Packaging Description:1 Per Ea, 1 Per Ea (1-per-ea)
Diameter (in):2" (2)
Max Psi:400psi (400psi)
Used on a:Regulator (regulator)
Used On Which Gas:Oxygen or Inert Gases
Which Side?:Using (using)
Connection Type:1/4" NPT
Case Material:Steel
Mount Position:Bottom Mount
Scale Type:Dual Scale (PSI/Bar)
----- new values below ----
Connection Type:1/4" NPT
Case Material:Steel
Crystal Material:Polycarbonate
Mount Position:Bottom Mount
Scale Type:Dual Scale (PSI/BAR)
Diameter (in):2" (2)
Max Psi:400psi (400psi)
Used on a:Regulator (regulator)
Used On Which Gas:Oxygen or Inert Gases
Which Side?:Using (using)
Packaging Description:1 Per Ea (1-per-ea)

INCLUDED

  • (1) 2-Inch Replacement Pressure Gauge (0-400 PSIG)

APPLICATIONS

  • Replacement of broken delivery gauges on heavy-duty regulators
  • Oxygen regulator delivery pressure monitoring
  • Inert gas (Argon, Helium, Nitrogen) flow monitoring
  • General industrial pressure measurement up to 400 PSI
  • Maintenance and repair of gas distribution manifolds

FAQ

The gauge features a 1/4-inch Male NPT (National Pipe Thread) connection, which is the standard size for most industrial gas regulators.

Yes, this gauge is cleaned and suitable for use with oxygen as well as inert gases, provided it is installed with oxygen-safe sealants.

The gauge reads from 0 to 400 PSIG (Pounds Per Square Inch Gauge) and also displays Bar readings up to 28 Bar.

The lens is made of a one-piece shatterproof polycarbonate material, which is much more durable than glass in industrial environments.

Yes, it will fit any regulator that has a 1/4-inch FNPT gauge port, regardless of the brand.

With a range of 0-400 PSI, this is typically used as a delivery (low pressure) gauge for heavy-duty regulators, or potentially a contents gauge for low-pressure gases like Acetylene (though Acetylene tanks are usually ~250 PSI).

No, the gauge typically comes with bare brass threads. You should apply an appropriate thread sealant or PTFE tape (oxygen-safe if used for oxygen) prior to installation.

The dial face is 2 inches (51mm) in diameter.