Operating instructions
AFGUARD
®
Zone 0 and Zone 1
FAUDI Aviation GmbH, Scharnhorststraße 7 B, D-35260 Stadtallendorf
BA_AFGUARD_Ex_rev2.6_Englisch_l
ogo
Is the connector to be inserted compliant
with explosion proof specifications?
Connectors for use with "Intrinsically safe"
("ia/ib") initiator types do not necessarily
have to be Ex-certified, because the energy
of the ex-i circuit is limited to a point avoiding
any ignitive sparks. (Limitation of short circuit
current and open-circuit voltage)
Is there no blue ex- i proof cable to be used
with ex-proof intrinsically safe electric circuit?
For ignition protection type‚ an "intrinsically
safe" ("ia/ib") cable, marked blue, is
generally required. Since the entire market
does not offer plastic coated cables with a
surface resistance of < 10
9
, the cable is to
be wiped only with a damp cloth considering
possible electrostatic charge.
Should a sensor cable for special
use/requirements be used?
For connector M 12X1, a cable socket with a
connection via user specific cable, 4 mm
2
to
8 mm
2
cross section, can be used.
Is the AFGUARD
®
sensitive to
extraneous
light?
Yes, the sensor optic should not be exposed
to light (>10 Lux). Therefore, installation into
a sight glass is not possible.
How does the sensor detect the difference
between water and jet fuel?
The principle of the AFGUARD
®
is based on
an optical process, relying on the refraction
index of the medium to be examined. The
refraction index of Jet Fuel and water
strongly diverge from each other. Water
results in an optical bypass of the mirror.
Can AFGUARD
®
differentiate between clean
water and jet fuel?
What is the output signal?
The output signal of the AFGUARD
®
is a so-
called standard signal of 4 to 20 mA. As an
example, for a measuring range of 0 to 50
ppm, this means having an output current of
4 mA = 0 ppm and 20 mA = 50 ppm. The
signal measuring span of 16 mA is
distributed linearly to the measuring range.
How can I assure that the AFGUARD
®
is
properly installed/positioned?
The marking near the SW36 screw nut
should be pointing to the direction of the
flow.
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