Hazardous area classification, explained
Zones, divisions, gas groups and temperature classes decide which equipment may sit in a classified area. IP and NEMA ratings answer a different question.
Compressor specific power
Electrical input power per unit of delivered free-air flow under specified operating and reference conditions.
A value in kW per m³/min can convert a matching free-air flow into an energy equivalent. Pressure, reference conditions and compressor operating mode must be consistent. Reducing demand does not guarantee proportional meter savings because unload and sequencing behavior matter. Try the air leak calculator.
See also: Free-air delivery · Motor efficiency
Use the concept: Compressed air leak cost calculator · 4–20 mA loop scaling · Engineering unit converter
In depth
PLC analog input scaling: raw counts, 4–20 mA and diagnostics
Map raw counts into engineering units, check the configured channel range, and keep signal-quality diagnostics separate from the displayed value.
Motor kW, current, efficiency and power factor: keep the quantities straight
A three-phase example distinguishes shaft output, real input power, apparent power and running current, with the limits of a simple estimate.