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IP Rating and NEMA Rating

The IP Rating (Ingress Protection Rating) of an instrument consists of the letters IP followed by two digits and an optional letter. 
As defined in international standard IEC 60529, it classifies the degrees of protection provided against the intrusion of solid objects including body parts like hands and fingers, dust, and accidental contact (the first digit after IP), and water (the second digit after IP) in electrical enclosures.

First digit: Solid particle protection

DigitProtection against solids
0No Protection
1Protected against solid objects up to 50mm e.g. accidental touch by hands
2Protected against solid objects up to 12mm e.g. fingers
3Protected against solid objects over 2.5mm e.g. tools
4Protected against solid objects over 1mm e.g. wires
5Protected against dust - limited ingress (no harmful deposit)
6Totally protected against dust

Digital Area Flow Meter IP40Our MASS-VIEW instruments are IP40 rated

Second digit: Liquid ingress protection

DigitProtection against liquids
0No Protection
1Protected against vertically falling drops of water e.g. condensation
2Protected against direct sprays of water up to 15 deg from the vertical
3Protected against direct sprays of water up to 60 deg from the vertical
4Protected against water sprayed from all directions - limited ingress permitted
5Protected against low pressure jets of water from all directions - limited ingress permitted
6Protected against strong jets of water e.g. for use on shipdecks - limited ingress permitted
7Protected against the affects of immersion between 15cm and 1m
8Protected against long periods of immersion under pressure
IP65 products LIQUI-VIEW and MAG-VIEWOur LIQUI-VIEW and MAG-VIEW instruments are IP65 ratedNEMA Rating

The National Electrical Manufacturers Association (NEMA) in the United States also publishes protection ratings for enclosures similar to the IP rating system published by the International Electrotechnical Commission (IEC). NEMA however also dictates other product features not addressed by IP codes, such as corrosion resistance, gasket aging, and construction practices. For this reason while it is possible to map IP Codes to NEMA ratings that satisfy or exceed the IP Code criteria, it is not possible to map NEMA ratings to IP codes, as the IP Code does not mandate the additional requirements.

IP codemin. NEMA enclosure rating to satisfy IP code
IP654, 4X

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