WIKA 21 20 Série Mode D'emploi page 8

4. Switch contacts
The permissible limits of U
depend on the sensor type. They can be taken from the corresponding EC-type
examination certificates. (The sensor type is stated on the connection plate of
the pressure gauge.)
GB
Suitable switch amplifiers are e.g.:
Circuit
(s. Ex-certific.)
Model 1
Model 2
Electromagnetic compatibility
EMC to EN 60 947-5-.
The instruments are to be protected against strong electromagnetic fields.
Adjusting red set pointers
The setting of the set point is achieved using the adjustment lock in the window
with the aid of the adjustment key (part of the scope of supply; found in
standard instruments on the side of the terminal box).
Red set pointer
Adjustment
lock
The set point indicators for the switch contacts are freely adjustable over the
full scale range. For reasons of switching accuracy and long life of the mechani-
cal measuring system, the switching points should be between 10 % and 90 %
of the measuring range.
8
, I and P
i i
Sensor type Model designation
Fa. Pepperl & Fuchs
standard KFD2-SR2-Ex1
standard KFD2-SR2 Ex2
standard KFA6-SR2-Ex1
standard KFA6-SR2-Ex2
SN-sensors KFD2-SH-Ex1
SN-sensors KHA6-SH-Ex1
WIKA Operating instructions pressure gauges Model  with 831 per ATEX
for the intrinsically safe supply circuits
i
EC-type exami-
nation certificate
PTB 00 ATEX 2080
PTB 00 ATEX 2080
PTB 00 ATEX 2081
PTB 00 ATEX 2081
PTB 00 ATEX 2042
PTB 00 ATEX 2043
WIKA-
Model
904.31
904.32
904.28
904.29
904.33
904.30
Removable
adjustment key