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34 EB 6116 EN
Operation
6 Operation
Risk of fatal injury due to the ignition of an
explosive atmosphere.
Incorrect installation, operation or mainte -
nance of the i/p converter in potentially ex -
plosive atmospheres may lead to ignition of
the atmosphere and cause death.
Î
The following regulations apply to instal -
lation in hazardous areas: EN 60079-14
(VDE 0165, Part 1).
Î
Installation, operation or maintenance of
the i/p converter must only performed by
personnel who has undergone special
training or instructions or who is autho
-
rized to work on explosion-protected de -
vices in hazardous areas.
Loss of Ex d protection due to opening the
enclosure cover or damage to the cover's
thread and/or the connecting thread.
Î
The enclosure cover must be firmly closed
during operation.
Î
Put the i/p converter out of operation
when its cover thread or connecting
thread is damaged. Replace it with a
new device.
The versions with a 0 to 20 mA input signal
do not have any switch-off electronics nor a
potentiometer to adjust zero. If the device
does not have a potentiometer for zero, the
zero point can only be adjusted mechani -
cally at the zero point adjuster (1.1). See
section 6.2.
Some versions also do not have a potentiom
-
eter to adjust the span.
6.1 Checking zero and span
The device converts the input signal propor-
tionally into the output signal.
The signal ranges are specified on the name -
plate (see section 2.1).
In case of a mounting position that is not
horizontal or when the pressure gauge/
screw plug does not face upwards, zero and
span can be corrected by approx. 10 %
using the electronics.
If the device does not work properly for any
reason, check the zero and span.
The
ZERO and SPAN potentiometers are ac-
cessible after opening the enclosure cover
(see Fig. 16).
6.1.1 Checking zero
1. Unscrew the enclosure cover.
2. Connect a pressure gauge (minimum ac-
curacy class 1) to the converter output.
3. Set the supply air to 0.4 bar above the
upper output signal range value and ap-
ply it to the device.
4. Deactivate the switch-off electronics at
the slide switch (5).
5. Set the input signal to the lower range
value using a suitable ammeter.
DANGER !
DANGER !
Note