Ralston Instruments

Ralston Instruments

Ralston Instruments is an American manufacturer specializing in portable pressure calibration equipment, hydraulic and pneumatic hand pumps, and precision pressure measurement accessories. The company is known for its modular quick-connect fitting system, which allows field technicians to assemble pressure calibration rigs rapidly and adapt to a wide range of pressure ranges and process media without specialized tooling.

Ralston Instruments products are designed for portability and ease of use, enabling calibration technicians and instrument engineers to perform accurate pressure calibration on transmitters, gauges, and switches directly in the field without returning to a central calibration laboratory.

Key Product Lines

• Hydraulic Hand Pumps — manual high-pressure sources for hydraulic calibration, available in a wide range of pressure ratings
• Pneumatic Hand Pumps — portable air pressure generators for field calibration of pneumatic instruments
• Pressure Calibration Kits — complete field systems including pump, reference gauge, hoses, and quick-connect fittings
• Digital Pressure Gauges — precision reference gauges for field and bench pressure calibration
• Analog Pressure Gauges — test gauges for general pressure measurement and verification applications

Industries Served

Ralston Instruments equipment is used in oil & gas, chemical and petrochemical processing, pharmaceutical manufacturing, power generation, HVAC and building automation, and water treatment industries. Their tools are widely used by instrumentation technicians and calibration engineers performing routine field instrument maintenance and verification.