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2
Introduction
DANGER!
The declaration of conformity, the examination certificate (both found at the end of this operating
manual), and the relevant regulations for sensors and supply units in potentially explosive areas
must be observed!
The sensors must only be operated on intrinsically safe electrical circuits appropriate for the version.
The admissible values can be found in the certificate.
General information
The pressure transmitter measures the pressure of gases, vapors, and liquids. The device operates ac-
cording to the piezoresistive measuring principle. The output signal is a load-independent direct current
which is linearly proportional to the input pressure.
The pressure transmitter type 404710 meets the requirements:
•
of device group II in the potentially explosive area of zones 1 and 2
•
of device group III in the potentially explosive area of zones 21 und 22
The EC-type examination certificate of the pressure transmitter reads:
SEV 09 ATEX 0101 X
CAUTION!
Do not damage the membrane of the pressure transmitter!
The followings measures must be observed:
•
Do not insert any articles into the pressure connection hole!
•
Do not direct the pressure blast at the membrane!
•
Do not deform the membrane. Under certain circumstances, even touching the membrane with your
fingers may cause damage.
•
The pressure to be measured must not exceed the admissible overpressure of the pressure trans-
mitter even at pressure peaks. Very high pressure peaks (water hammer) may damage the pressure
transmitter. Under these conditions, take the appropriate measures (e.g. insert a damping element).
2 Introduction
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