Overview

The King Instrument 75302117C-05 is a precision variable area flowmeter (rotameter) designed for compressed air and pneumatic gas flow measurement. This model features a 250mm acrylic tube with a calibrated scale reading 2 to 20 SCFM (standard cubic feet per minute). King Instrument rotameters are built for reliability and accuracy in industrial pneumatic systems, hydraulic test applications, and laboratory gas flow monitoring.

Key Features

• Flow range: 2–20 SCFM (air calibrated)
• 250mm tube length for clear, easy-to-read scale graduation
• Acrylic tube construction for visibility and chemical resistance
• 10:1 turndown ratio (typical for King Instrument series)
• Variable area design provides linear flow indication
• Compact footprint suitable for bench-top or panel mount installations

Technical Specifications

Typical Applications

• Pneumatic system flow verification and troubleshooting
• Compressed air consumption monitoring
• Gas pressure testing and calibration labs
• Pump and compressor performance testing
• Industrial equipment commissioning and maintenance
• Flow-dependent process control and regulation

Compatibility & Replacements

Compatible With

• Standard pneumatic systems using 1/4″ NPT or equivalent fittings
• Compressed air lines and test benches
• Low-pressure gas distribution networks
• Flow-monitoring retrofit applications in existing setups

Replaces / Drop-In Replacement For

This unit is directly compatible with other King Instrument rotameter models in the 7520/7530 series featuring the same 2–20 SCFM range and 250mm tube length. Verify connection sizing and pressure rating with your system integrator before installation to ensure proper fit and performance.

Works With

• Brass and stainless steel pipe fitting adapters
• Standard 1/4″ NPT connections
• Pneumatic regulators and flow control valves
• Pressure gauges and monitoring instrumentation
• Compressed air delivery and test equipment