PRODUCTS INTERNATIONAL PROTECTION

The IP classification according to EN 60529 describes how the encoder
is protected against particles and water. It is described as an abbreviation
"IP" followed by two numbers。
The first digit defines the size of the particles. The higher the number the
smaller the particles.
The second digit defines the resistance against water. The higher the
number, the higher the water pressure can be.
These two tables summarise the most used IP ratings:
First digit (Protection against particles)
0 No protection;
1 Protected against solids objects over 50mm;
2 Protected against solids objects over 12mm;
3 Protected against solids objects over 2.5mm;
4 Protected against solids objects over 1mm;
5 Protected against dust - limited ingress;
6 Totally protected against dust.
Second digit(Protection against water)
0 No protection；
1 Protected against vertically falling drops of water；
2 Protected against direct sprays up to 15° from the vertical ；
3 Protected against direct sprays up to 60° from the vertical ；
4 Protected against sprays from all directions ，limited ingress permitted；
5 Protected against low pressure jets if water from all directions，
limited ingress permitted；
6 Protected against strong jets of water；
7 Protected against the effects of temporary immersion between 15cm
and 1m. Duration of test 30 minutes；
8 Protected against long periods of immersion under pressure。