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Simrad AP50 Autopilot
68 20221032B
3.23 Environmental Protection
Each part of a Simrad autopilot system has a two-digit IP
protection code.
The IP rating is a method to classify the degree of protection
against solid objects, water ingress, and impact afforded by
electrical equipment and enclosures. The system is recognized in
most European countries and is set out in a number of British
and European standards.
The first code number describes the protection against solid
objects and the second number describes the protection against
liquids.
FIRST NUMBER
Protection against solid objects
SECOND NUMBER
Protection against liquids
IP TESTS IP TESTS
0 No protection 0 No protection
1 Protection against solid objects
up to 50 mm, e.g. accidental
touch by hands.
1 Protected against vertically falling
drops of water (e.g.
condensation).
2 Protection against solid objects
up to 12 mm, e.g. fingers.
2 Protected against direct sprays of
water up to 15° from the vertical.
3 Protection against solid objects
over 2.5 mm (tools + wires)
3 Protected against sprays to 60°
from the vertical.
4 Protection against solid objects
over 1 mm (tools + wires +
small wires)
4 Protected against water sprayed
from any direction - limited
ingress permitted.
5 Protection against dust - limited
ingress (no harmful deposit)
5 Protected against low-pressure
jets of water from all directions -
limited ingress permitted.
6 Totally protected against dust 6 Protected against strong jets of
water, e.g. for use on ship decks -
limited ingress permitted.
7 Protected against the effects of
immersion between 15 cm and 1
m.
8 Protected against long periods of
immersion under pressure.
3.24 NMEA Sentences
See table next page.