Tronair HC-2279 Pressure Gauge, 0 to 5,000 PSI

The HC-2279 is designed for rigorous use in aviation ground support and hydraulic systems where pressures reach up to 5,000 PSI. It’s commonly used on tripods, jacks, and hose test benches to reliably monitor high-pressure performance. Its wide range makes it a versatile option for MRO shops servicing business jets, general aviation aircraft, and ground support equipment.

This gauge features a dry 1/4" male NPT connection, a standard thread type commonly used in many hydraulic and GSE test systems. Using the correct thread ensures a leak-free installation and maintains the gauge’s calibration integrity. Always match the port size and sealing method to avoid misalignment or pressure errors.

According to calibration data sheets, the HC-2279 has an accuracy of approximately ±1% of full scale when properly calibrated. This level of precision makes it suitable for applications where pressure readings have a direct impact on safety-critical operations. Frequent calibration checks help ensure long-term reliability and consistent performance.

The HC-2279 is designed to withstand aviation environments, including temperature ranges as low as approximately -40 °F and up to moderately high-temperature operating conditions. It features a dry gauge design (no liquid fill) and robust materials suited for hangar and ramp usage without concern for fluid freezing. Proper mounting and exposure to minimal vibration help maintain accuracy.

Tronair recommends recalibration whenever you observe erratic readings, pointer drift, or after turning the gauge over for heavy use. For most aviation ground-support equipment, annual calibration is a good practice, although heavy use may require more frequent checks. Failing to calibrate can lead to inaccurate pressure readings and compromise safety.

Common indicators include a pointer not returning to zero when depressurized, cracked or fogged dial glass, damage to the glass window or bezel, or persistent readings outside expected values. If the gauge displays inconsistent or fluctuating values under known pressures, it may be time for repair or replacement to maintain system integrity.

While physically possible, use with other gases must still align with the manufacturer’s material compatibility and cleaning technologies. If used for non-hydraulic, non-oxygen service, confirm the gauge’s internal materials and suitability for the particular service medium to avoid corrosion or contamination.

A dry gauge (no fill fluid) like the HC-2279 reduces the risk of viscosity changes, fluid freezing, or bulging under extreme pressure or temperature shifts. This makes it more stable and reliable for aviation ground-support equipment exposed to varying conditions. It also simplifies maintenance and eliminates concerns about liquid fill degradation.

Mount the gauge using the wrench flats only – never grip the housing. Use a clean thread sealant approved for hydraulic service, and ensure connection torque is within the manufacturer's specifications to avoid stress or distortion. Orient the gauge dial for easy readability in service conditions and protect the glass face from impacts.

Features include a large, clearly marked dial, a pointer with fine resolution, and durable bezel and case construction that resists fogging or damage in hangar environments. This enables ground support staff to quickly monitor pressure during high-cycle operations and respond to changes in real time.

Tronair provides a limited warranty covering defects in materials and workmanship from the date of shipment. Service options include authorized calibration and repair labs capable of verifying performance to the standard specifications. Keeping usage and calibration records supports warranty claims and ensures continuous accuracy.

PJi offers a wide range of replacement parts for Tronair GSE, including the HC-2279 pressure gauge, along with documentation such as Certificates of Conformance (CofCs) and traceable calibration records. When ordering, ensure the correct part number and revision are specified to maintain compatibility and system integrity.