16/07/2025
IMG-20221117-WA0886.jpg: Dual-Scale Pressure Gauge
Scale 1 (Primary - Outer):
Unit: bar (metric pressure unit)
Range: 0.5 → 1.5 → 2.5 → 17.5 → 20 → 22.5 bar
(Major markings at 0.5, 1.5, 2.5, 17.5, 20, 22.5 bar)
Scale 2 (Secondary - Inner):
Unit: psi (pounds per square inch, imperial unit)
Range: Approx. 7.25 → 21.75 → 36.25 → 254 → 290 → 326 psi
(Aligned with the bar scale; 1 bar ≈ 14.5 psi)
Key Notes:
Industrial dual-scale gauge for compatibility with metric/imperial systems.
Typical applications: Hydraulic systems, compressed air, gas pipelines, or machinery requiring medium-pressure monitoring (up to 22.5 bar/326 psi).
2. IMG-20221117-WA0889.jpg: Air Pressure Gauge with Secondary Scale
Primary Scale (Center Dial):
Unit: bar
Range: 0.5 → 1.5 → 2.5 → 3.5 → 4.5 → 5.5 bar
(Fine graduations for precision reading)
Secondary Scale (Outer Arc):
Label: "Dair" → Likely "Air" (D may denote "Differential," "Dry," or a model prefix).
Range: 15 → 20 → 25 → 30 → 35 → 40 → 50
Likely Units:
Flow rate (e.g., m³/h, CFM): For air compressors or pneumatic systems.
Alternative: Pressure in a secondary unit (e.g., kPa), though less common.
Key Notes:
Designed for compressed air systems (as labeled "Dair").
Combines pressure measurement (bar) with flow/auxiliary monitoring (outer scale).
Applications: Industrial air compressors, pneumatic tools, HVAC controls.
Critical Missing Details
Accuracy Class: (e.g., ±1.0%, ±2.5% FS).
Connection Size/Type: (e.g., G 1/4", 1/8" NPT).
Dial Size: (e.g., 63mm, 100mm).
Material: (e.g., Stainless steel, brass).
IP Rating: (e.g., IP65 for dust/water resistance).
Secondary Scale Units: Explicit unit for the outer arc (e.g., m³/h, CFM).
Interpretation Summary
Gauge Pressure Range Secondary Range Application Clues
Dual-Scale (WA0886) 0.5–22.5 bar / 7–326 psi None Hydraulics, gas systems
Air Gauge (WA0889) 0.5–5.5 bar 15–50 (flow?) Compressed air/pneumatics
Pressure Gauge
