Operating environment of pressure testing machine

Temperature: 5 ℃~+28 ℃ (average temperature within 24 hours ≤ 28 ℃)
Relative humidity: ≤ 85% RH
Air pressure: 86kPa~106kPa
Power supply conditions: three-phase four-wire+protective ground wire,
Voltage range: AC (380 ± 38) V
Allowable frequency fluctuation range: (50 ± 0.5) Hz
The grounding resistance of the protective ground wire is less than 4 Ω
The user is required to configure the air or power switch with corresponding capacity for the equipment at the installation site, and the switch must be used independently for the equipment