| Measurement Range | The gauge should cover the normal operating pressure without frequently reaching its upper limit. | Common air-pressure ranges include 0–1 bar, 0–2.5 bar, 0–10 bar, and 0–16 bar. | Choose a full-scale range about 25% to 50% higher than the maximum expected working pressure. |
| Accuracy | Higher accuracy improves pressure control, leakage detection, and maintenance decisions. | Digital gauges commonly specify accuracy from approximately ±0.05% to ±1.0% of full scale, depending on design and conditions. | Use ±0.25% to ±0.5% full-scale accuracy for general industrial monitoring; select higher accuracy for calibration or laboratory work. |
| Pressure Units | Different industries and regions use different pressure units, so conversion capability reduces reading errors. | Common units include bar, psi, kPa, MPa, kgf/cm², and inHg. | Choose a gauge that supports the units used by the equipment manual and maintenance team. |
| Connection Type | The process connection must match the pneumatic fitting and installation space. | Common connections include G1/8, G1/4, 1/8 NPT, 1/4 NPT, and quick-connect fittings. | Match thread standard, size, sealing method, and connection orientation before purchase. |
| Gauge Pressure or Absolute Pressure | The measurement reference affects the meaning of the reading, especially at changing elevations or in vacuum applications. | Gauge pressure compares pressure with ambient atmosphere; absolute pressure compares it with a near-perfect vacuum. | Select gauge pressure for most compressed-air systems and absolute pressure for vacuum, altitude, or gas-law calculations. |
| Wireless Communication | Wireless access enables remote readings, data logging, alarms, and inspections without opening the equipment enclosure. | Short-range Bluetooth Low Energy is common; longer-range systems may use Wi-Fi, cellular, or industrial wireless networks. | Choose Bluetooth for nearby service work and Wi-Fi or cellular connectivity for distributed monitoring. |
| Data Logging | Stored readings help identify pressure drops, intermittent faults, leakage, and equipment cycling. | Logging intervals may range from seconds to hours; memory capacity varies by device and sampling interval. | Select adjustable sampling intervals and exportable CSV or equivalent files for trend analysis. |
| Alarm Functions | High- and low-pressure alerts allow users to respond before production or equipment performance is affected. | Available alert methods include on-screen warnings, audible alarms, indicator lights, app notifications, and relay outputs. | Use adjustable alarm thresholds with hysteresis to reduce repeated alerts near the limit. |
| Ingress Protection | Protection against dust and water is essential for workshops, outdoor installations, and washdown areas. | IP54 protects against limited dust ingress and water splashes; IP65 provides dust protection and water-jet resistance when properly tested. | Choose the IP rating according to the actual installation environment and cleaning method. |
| Operating Temperature | Temperature can affect sensor accuracy, battery life, display readability, and wireless performance. | Many industrial electronic gauges operate near −10°C to 50°C or −20°C to 70°C, depending on the model. | Select a specified range that covers both the ambient temperature and the process temperature. |
| Power Supply | Power requirements influence installation complexity, service intervals, and suitability for remote locations. | Options include replaceable batteries, rechargeable batteries, USB charging, and wired supplies such as 12–24 V DC. | Choose battery operation for portable checks and wired power for continuous monitoring or frequent alerts. |
| Display and Readability | A clear display reduces reading errors in low-light, high-glare, or restricted-access locations. | Common features include backlighting, large digits, selectable units, automatic shutoff, and peak-pressure display. | Select a backlit display with digits large enough to read from the normal inspection distance. |
| Calibration and Traceability | Calibration records support quality control, preventive maintenance, and measurement confidence. | Calibration intervals are application-dependent; many organizations use annual verification as a starting point. | Choose a gauge with a documented calibration procedure and recalibrate according to risk, usage, and applicable requirements. |