Spark Test Detectors

Product

The FUX 3001 spark detector is the
standard product of the Minimax
spark detector range. It has proven
its effectiveness and extreme re -
liabil ity in pneumatic extraction
systems over decades.
In critical areas where contamination
of the detector window can be ex -
pected, its optical capability can be
monitored by a manual or cyclic
repeti tive test impulse controlled
via the spark detection and extin -
guish ing control panel using a

Use
spark test detector.
Optical light guide cable are used
for isolating the temperature of the
detector electronics for application
areas above 80 °C.
Cleaning intervals can be reduced
considerably through the use of
air-jet devices if relatively frequent
contamination of the detector
window can be expected due to
the material being conveyed.

Advantages 
+ A high degree of functional reliability
+ Automatic sensitivity tracking
+ Can be optimally used for nearly
every application, due to its modular
design
+ Mounting adaptors for flush mounted
instal lation and easy maintenance.
Fast maintenance device
+ Rapid checking of the operational
readiness via an LED integrated in the
detector housing
+ With SilEx 4000 and SilEx 4000 with
air flushing non-Ex-detectors of
existing systems can be modified
for use in Ex monitoring areas in
accordance with ATEX 94/9/EC for
Zones 20, 21 and 22.
+ Contamination of the detector
window can be reduced significantly
with an air purge device
+ Adapters are available for high
application temperatures up to 450 °C
+ Robust version for extreme
industrial areas
+ Ex-classification in accordance with
ATEX 94/9/EG for Zones 20/22
Spark detectors of the FUX 3001
range are utilised for detecting
sparks in dark conveyor systems
and driers. The most frequent
application is in pneumatic conveyor
systems where high func -
tional reliability is required to
effectively prevent fires and
explosions.
Ex-detectors conforming to
ATEX 94/9/EC are used in areas
where there is a risk of dust.
Typical applications include:
– timber and chipboard industry
– paper industry
– recycling industry
– textile industry
– mills
– food industry
– coal dust conveyance
– rubber industry
– chemical industry
– fertiliser industry
– drying systems
– milk powder indust

Function

Minimax spark detectors detect electromagnetic radi -
ation in the near infrared range, a spectral range in
which glowing particles radiate intensively. The sensing
element is especially suitable for this application.
Radiation in the visible and UV range is absorbed by a
black glass filter. Intensity fluctuations emitted by sparks
are measured via the photo-electric as well as an electronic
evaluation circuit and trans mitted to the control
panel as an alarm signal.
Spark detectors can be installed in straight ducts or
piping of differing nominal diameters from approx.
150 mm without the need for design alterations. A
minimum of two spark detectors are installed opposite
each other to enable monitoring of the complete piping
cross section. In case of large piping cross sections
(≥500 mm), extremely high conveyor output and high
density of conveyed material, several spark detectors
must be used for each measuring point.
Minimax spark detectors are distinguished by a range
of special performance characteristics. Particularly
noteworthy is the extremely high interference distance,
des pite its highly sensitive response behaviour. The
entire system is distinguished by this characteristic.
Spark detector versions
Detectors with a light-sensitive element and elec tronics
thermally isolated from the hot area via a heat-resistant
flexible optical light guide cable must be used in areas
where particularly high ambient temperatures (≥80 °C)
prevail (e.g. on exhaust gas piping or behind dryers).
The FUX 3001 L1 spark detector has proven its effec -
tive ness here, as its nominal sensitivity is practically as
high as that of the FUX 3001, due to special design
charac teristics. In addition, other versions can be
supplied on request, e.g. for temperatures up to 450°C
and versions with several meters long fibre optics.
Accessories for spark detectors
The mechanical construction of the Minimax spark
detector is such that impurities that collect on the
window can be practically ruled out completely. Despite
of this, detectors and the system require regular main -
tenance. The detectors are equipped with single-hole
installation devices for easy checking and cleaning of
the spark detector window. The detectors can be drawn
out of the sleeve for maintenance purposes after
loosening the union nut. In as far as the process allows
this, an air purge device can be installed at the outset,
at par ticularly critical positions, to prevent contam -
ination of the detector window as far as possible.
Operational readiness can also be checked from the control
panel with the aid of special spark test detectors.
The spark test is conducted as a real test and includes
testing of the optical capability of the de tector and window
damage. The test detector is mounted in a separate
housing on the pipe wall opposite the spark detector.

Technical data

Spectral sensitivity 780 to 1,120 nm
Identification criteria Rapid developing changes in intensity
Detection time
5 ms
Viewing angle 100°, 60° with air flushing
Casing dimensions (H x B x D) 75 x 80 x 57 mm
Weight 0.45 kg
Casing colour RAL 5009
Ex protection class Category 3D/1D
Nominal voltage 9 V DC
Operating voltage 7.6 to 13.2 V DC
Quiescent current Approx. 1 mA at 9 V
Alarm current Approx. 20 mA at 9 V
Alarm display LED, red
Maximum detector number per line 5
Ambient temperature –25 °C to +80 °C /120 °C/350 °C
Protection class IP 65
VdS approval G208191
Basic type authorisation FM/VNIIPO (Russland)
Cable type (recommended) 5 x 0,5 mm2 LIYCY
(electrostatic shielding required)
Max. outer cable diameter 6.8 mm
Max. cable length max. 280 m, at 0.5 mm2
Compatible with control panels Minimax FMZ 4100 Series FMZ 5000 Reflex
Versions
Version Art. No. Installation
FUX 3001 800021 Single-hole mounting/Singlesingle-hole
hole mounting with air flushing
FUX 3001 Ex Dust 905096 Single-hole mounting/Singlesingle-hole
hole mounting with air flushing
FUX 3001 800033 Single-hole mounting/SingleL1
500 lg. single-hole hole mounting with air flushing
FUX 3001 Ex Dust 905098 Single-hole mounting/SingleL1
500 lg hole mounting with air flushing
FTX 3001 800069 Single-hole mounting/Singlesingle-hole
hole mounting with air flushing
FTX 3001 Ex Dust 905099 Single-hole mounting/Singlesingle-hole
hole mounting with air flushing
FTX 3001 L1 904480 Single-hole mounting/Singlesingle-hole
hole mounting with air flushing
FTX Ex Dust L1 905100 Single-hole mounting/Singlesingle-hole
hole mounting with air flushing
FUX 3001 L1 PSU 836800 Food industry