Watson-Marlow 620U - Manual (Page 11)

Watson-Marlow 620UN, 620U, 620SN, 620S User Manual 11
UN, U, SN, S IP (Ingress Protection) and NEMA definitions
IP
NEMA
1st Digit 2nd Digit
3
Protected against
ingress of solid objects
with a diameter of
more than 2.5mm.
Tools, wires etc with a
thickness of more than
2.5mm are prevented
from approach
1
Protection against
dripping water falling
vertically. No harmful
effect must be
produced
2
Indoor use to provide a
degree of protection
against limited
amounts of falling
water and dirt
5
Protected against
harmful dust deposits.
Ingress of dust is not
totally prevented but
the dust must not
enter in sufficient
quantity to interfere
with satisfactory
operation of the
equipment. Complete
protection against
contact
5
Protection against
water projected from a
nozzle against the
equipment (enclosure)
from any direction.
There must be no
harmful effect (water
jet)
12
Indoor use to provide a
degree of protection
against dust, falling
dirt and dripping, non-
corrosive liquids
13
Indoor use to provide a
degree of protection
against dust and
spraying of water, oil
and non-corrosive
coolants
6
Protection against
ingress of dust (dust-
tight). Complete
protection against
contact
6
Protection against
heavy seas or powerful
water jets. Water must
not enter the
equipment (enclosure)
in harmful quantities
(splashing over)
4X
Indoor or outdoor use*
to provide a degree of
protection against
splashing water, wind-
blown dust and rain,
hose-directed water;
undamaged by the
formation of ice on the
enclosure. (Resist
corrosion: 200-hour
salt spray)
* 620 cased pumps are rated to NEMA 4X (indoor use) only.