Overview
The NOSHOK 300 series pressure gauge is a heavy-duty liquid-filled dial indicator designed for precise pressure measurement from 0 to 300 PSI (2,068 kPa). Built with a die-cast brass case and glycerin-filled Bourdon tube, this gauge combines durability with accuracy for industrial, hydraulic, and pneumatic applications. The natural brass finish and polished movement provide reliability in demanding environments where vibration and pressure pulsation are common.
Key Features
- Liquid-filled design — Glycerin fill dampens vibration, pulsation, and shock for stable readings
- ±1.6% full-scale accuracy — Meets ASME B40.100 and EN-837-1 standards
- Die-cast brass case — Natural brass finish resists corrosion in hydraulic and pneumatic systems
- Durable movement — Brass and nickel-silver components with highly polished bearing surfaces
- Safety relief plug — Standard thermal expansion protection in the case
- Acrylic lens — O-ring sealed for splash and moisture resistance
Technical Specifications
- Pressure range: 0 to 300 PSI (0 to 2,068 kPa)
- Dial size: 2.5″ (63 mm)
- Case material: Die-cast brass with natural brass finish
- Wetted parts: Copper alloy Bourdon tube and brass connections
- Fill medium: Glycerin
- Accuracy: ±1.6% full scale
- Connection: 1/4″ NPT male bottom (310 series) or back (300 series)
- Operating temperature: −4 to +140°F (−20 to +60°C)
- Overpressure rating: 1.1 to 1.3 times full scale (per ASME B40.100)
- Scale: Single scale PSI (psi/bar or psi/kPa dual scale available)
Typical Applications
- Hydraulic system monitoring and pump control
- Pneumatic air system pressure measurement
- Automotive test and diagnostics
- Construction and mining equipment
- Stamping and forming press pressure control
- General industrial fluid power systems
Compatibility & Replacements
Compatible With
- Hydraulic power units and cylinders
- Air compressor discharge lines
- Pneumatic control systems
- General industrial pressure manifolds with 1/4″ NPT ports
- Process control and monitoring applications rated to 300 PSI
Replaces / Drop-In Replacement For
- Earlier NOSHOK 300 series units (25-300 family)
- Compatible with other 2.5″ liquid-filled gauges on equivalent 1/4″ NPT mounting (verify thread type and connection orientation before installation)
- Consult NOSHOK product selector or your distributor for legacy model cross-reference
Works With
- Standard 1/4″ NPT hydraulic and pneumatic fittings
- SAE and ISO fluid power system connections
- General industrial control panels with 2.5″ gauge cutouts
- Glycerin-compatible fluids (standard mineral oils, phosphate esters, water-based fluids per system design)
- Operating conditions: dynamic pressure up to 60% of range; static pressure up to 90% of range
