EDS EV-395 Manual

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EDS - TECHNICAL INFORMATION
SPARK DETECTOR
EV - 395
TECHNICAL INFORMATION
EDS srl - Via Ca' Nova Zampieri 6 - 37057 S. G. Lupatoto - VERONA - ITALY - Tel. [phone] - Fax [phone]
Email: [email protected] - Web: www.eds.eu

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EDS - TECHNICAL INFORMATION
EV - 395 SPARK
DETECTOR
The EV-395 Spark Detector is suitable for a really
quick detection of sparks that can be conducted in
the pipes of silos or storehouses that contain
flammable materials like wood sawdust, ecc.
The extreme quickness of the response of this
detector can prevent the starting of a fire causing
great damages to things and people.
1- MOUNTING INSTRUCTIONS
1.1 - The detector can be used as a standalone
detector (reccomended) or with its EV521 control
unit designed specifically for this usage. The EV521
can control two EV395 detectors. This Contro Unit
is equipped with a stabilized power supply, Test
circuits, timers and 4 output relays. Moreover the
Control Unit contains very quick circuits so that the
response time results very short.
1.2 - Drill a hole of 60 mm of diameter on the
surface of the pipe to be controlled
1.3 - Install the detector on the external part of the
pipe using the black O ring and the 2 fixing brackets
included or the 4 fixing hole present on the box of
the detector
1.4 - Adjust the distance from the surface, using
suitable thick materials, so that the internal view
window of the detector is not sticking out too much
inside the pipe because this could be on obstacle
for the materials flowing in the pipe or start an
encrustation that could cause the obscuration of
the window.
1.5 - Connect the detector as indicated in the
electric diagram of fig. 1 or, if connected to EV521
Control Unit, as indicated in the connection diagram
detailed in EV521 instructions.
1.6 - As power supply an alternate voltage of 24
Vac could be used or a 22-28 Vdc direct current
which is our suggestion. In this case the power
supply terminals on the board do not have polarity.
1.7 - It is possible to connect a TEST button to the 4-
5 terminals (with normally open NO contact) that
permits to do a periodic operational test of the detector.
When the button is pressed the detector is tested with
a simulation of a detecting a spark getting in its field
of view, and consequently gets in alarm condition
driving its output relay
1.8 - The detector has two internal regulations (fig.
2)
nsensitivity regulation (trimmer P1)
nregulation of the output relay activation time (trimmer
P2)
These adjustments have to be done according to the
environment where the detector is installed.
1.9 - The detector has a flied of view of 90° (solid
angle) and it's useful for pipes with diameters up to 50
cm. If the diameter is more than that, or if the pipe has
an square, rectangular section, etc., it is suggested
to use a couple of EV395 detectors installed on
opposite sides watching each other, to avoid blind
zones outside the viewing field of the detector and to
be sure that detection is performed.
1.10 - The output relay can be coveniently used to
activate an electrovalve driving a sprinkler spaying
nozzle to perform the automatic extinguishing of the
spark in the pipe. So this noozle will spray water for
a time duration set by the trimmer P2 (adjustable
from 0 to 10 seconds). The normal suggested time
is 3 seconds.

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EDS - TECHNICAL INFORMATION
1.11 - When beign certain of the automatic spark
extinguishing is necessary or in important installations,
where security should be set at the highest level, we
suggest to install another detector (or detectors couple)
at a suitable distance from the detector or couple of
detectors already installed, for a forward confirmation of
the performed extinguishing. Ifextinguishing was performed
correctly this second detector will stay inactive, otherwise it
will activate and its output relay will be used to :
•activate a second sprinkler spraying nozzle for a
second extinguishing attempt
•close the output mounth of the pipe by means of an
automatic shutter before the materials are deployed
in the Silo
•activate a suitable acoustic alarm
2 - OPERATION
2.1 - With reference to fig. 5 about a 2 detectors
installation, if a burning spark passes through the first
detector's field of view, the EV395 detector gets in
alarm condition, its output relay immediately activates
and remains activated for a time duration equal to the
one set with P2 trimmer between 0 and 10 seconds.
The output contact of this relay will be used to drive
VL1 electrovalve that will activate the water spraying
by the SS1 noozle for a first extinguishing attempt.
2.2 - If the spark has been extinguished, the system
returns to normal operation, otherwise the spark,
continuing its ride, wil enter in the field of view of the
second EV395 detector.
This will activate its output relay. The contact of this
relay will drive VL2 electrovalve that will activate the
water spraying by the SS2 noozle for a second
extinguishing attempt.
3- RESPONSE TIME
3.1 - The times to evalauate during the designing
process of a spark detection system are the following:
T1 - response time of EV395 detector
T2 - response time of the detector's output relay
T3 - acquisition time of EV521 Control Unit and
response time of its relay
T4 - response time of extinguishing electrovalve VL
T5 - filling time of the part of pipe goig from the
electrovalve to the noozle SS and time of water
cone generation
If in the system there's no EV521 Control Unit
included the time relative to the Control Unit (T3)
shall not be counted.
The usual values of this times are:
T1 - 3 ms
T2 - 1 ms
T3 - 10 ms
T4 - 2 ms
T5 - depends on pipe lenght, pipe section and most
of all on water pressure
3.2 - For designing calculations the T1-T4 time can
be considered of 60 ms max.
The T5 time should be added to that. This time is
dependent on the pipe sectionand lenght, on water
presssure and on the used noozle. With a SP34F22
noozle and a water pressure of 3-4 bar a water
speed of 4-6 m/s is obtained. So if the piece of
pipe between electrovalve and noozle is 1 m long,
the transit time is around 0.2 s.
Therefore summing the T1-T5 times the result is
0,22 s.
This is the system response time.
4- NOZZLE POSITIONING
4.1 - The spaying noozle has the function of
extinguishing the spark.
Its position must be calculated taking in account the
times detailed in the previous chapter and the
speed of the fluid or materials flowing in the pipe.
For a calculation of the mean value, a simple
Physics formula can be used:
S = vt
where :
S= covered lenght in meters
v= speed of the fluid in the pipe m/s
t= response time of the security system
The fluid speed has to be measured in place.
Normally the following speed is measured:
•wood industry : 20-30 m/s
•textile industry : 10-20 m/s
For other applications a measurement is required.
So the calculation is simple knowing the 3
parameters of the formula.

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EDS - TECHNICAL INFORMATION
I
7 - TECHNICAL DATA
6- OPERATIONAL TEST
4.2 - Example:
fluid speed : 25 m/s
response time : 0,22 s
calculation :
S= 25 * 0,22 = 5,5 m (lenght of spark's run)
So in this case the spraying nozzle has to be
positioned at least 6,25 m (7-8 m) far from the point
where the Spark Detector is installed, so that the
spark can be extinguished by the sprinkler nozzle.
A diagram detailing the fluid speed in relation to
distance is provided in fig. 1 for the system
designers.
As T5 time has a great influence over the total
time , it is necessary to do the following in order
to decrease the response time of the system:
•higher water pressure (4-6 bar)
•larger pipe section
•a nozzle with an higher (32-63 l/min)
We suggest to use an autoclave of 20-30 litri with
pressured tank and pump.
If the pipe is long, we suggest to use of a tank with
fly-wheel function and unidiectional valve, to avoid
the loss of pressure caused by the load loss.
5- MAINTENANCE
5.1 - The Spark Detector must be periodically
cleaned. The detector has to be unmounted from
its brackets or fixing and its viewing window has to
be washed with a cloth dampened with water and
little soap. No type of alchool or solvent should be
used.. This operation has to be done periodically
according to the type of fluid. The fluid flowing in
the pipe normally keeps the window clean by
rubbing. The normal dust quantity that settles on the
viewing window do not have any influence on the
detector's operation because the infrared radiation
passes through the dust.
5.2 - Periodically check the mechanical parts of
the system.
If an automatic shutter or a fluid deviation device
is used, it is necessary to periodically verify its
operation and to lubrificate the moving parts.
5.3 - Periodically verify the operation and tightness
of the water interception electrovalve. A tightening
defect can cause a flooding of the pipe resulting in
damages.
t's good to install up stream a suitable tap and a filter
to retain impurities that can have influence on the
electrovalve operation. Another good thing to do is to
install some water draining elements along the pipe.
5.4 - If the system is installed outside the factory
building the freezing cold problem shall be evaluated.
The water pipe must be caulked and the elements of
the extinguishing system (electrovalve, pressure
gauge) musto be isoleted from freezing.
If this precautions are not enough we suggest to use
an heating cable commanded by a thermostat so that
a temperature of more than 0° degrees.
5.5 - If the systems remains unused for a long time
it's good to drain all the water from the pipe.
5.6 - Check electrical connections (terminal boards,
connectors, ecc.) of the various elements of the
system.
In particular verify the grounding of the metal elements
of the system.
6- OPERATIONAL TEST
6.1 - A TEST button connected to the 4-5 terminalson
the board must be pressed to perform the operational
test of the Spark Detector. If the installed system
includes Control Unit EV521 the TEST button,
positioned on the front panel of the unit or you can press
the remote button connected on terminals 17-18 of the
The information contained in this document has been carefully evaluated
and can be considered reliable. In any case, the EDS company does not
take responsibility for any inaccuracies. Furthermore, the EDS company
reserves the right to make changes in any part of this document and / or
product, such as to increase its quality, reliability or design.
© Copyright 20015-2025 Electronic Detection Systems. All rights reserved.
date: 09 Gennaio 2017
filename: EV395_ist_en_2019.pdf
EDS SRL - V. Ca' Nova Zampieri 6 - 37057 S. G. Lupatoto (VERONA)
Italy - Tel. [phone] - Fax [phone]
[email protected] - www.eds.eu

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EDS - TECHNICAL INFORMATION
0
5
10
15
20
25
30
0510 15 20 25 30
velocità
del fluido
[m/s]
distanza
[m]
tempo di risposta
del sistema 0,25s
non usare
zona consigliata
7 - TECHNICAL DATA
•power supply : 24 V ac-cc
•power consumption : 20 mA - 50 mA (alarm)
•internal voltage stabilizer
•circuit for protection against ESD
•viewing angle : 90°
•response time : 3-15 ms
•max viewing distance : about 50 cm (Spark
dimention 1 mm circa T=800°C)
•alarm led
fig.1
distance
System response
time 0.25 sec
Suggested area
do not use
fluid speed
•sensitivity regulation : half trimmer
•alarm duration adjustment : 0 - 10 sec
•operation with normally activated or deactivated
relay
•output relay : 6A/24 V
•box : light alloy fusion
•protection index : IP 67
•dimentions : 140x135x85
•weight : 0,7 Kg.

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EDS - TECHNICAL INFORMATION
Fig. 1
Electrical Connections Diagram
NC NA
C
TEST 24Vcc,ca
1 2 45673
RELE' EV395
fig.2
ELECTRICAL CONNECTION DESCRIPTION
Relay
INTERNAL ELEMENTS DESCRIPTION
P1=Sensitivity regulation trimmer
P2=Alarm duration regulation trimmer
JP1=Relay activated/deactivated selection jumper
Position A: relay with memory (remains in alarm until power supply is removed)
Position B: relay normally activated mode (alarm duration regulated by P2)
Position C: relay normally deactivated mode (alarm duration regulated by P2)
L1=alarm led
To verify the circuit operation is sufficient to short circuit the TEST A and TEST B terminals
RELAY

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EDS - TECHNICAL INFORMATION
Fig. 4 - Example of system with 2 EV395
Fig. 3 -Example of a system with one EV 395
Pipe Water feed pipe
Spraying NozzleEV395 Spark Detector
electrovalve
pressure gauge pressure gauge
electrovalve
nozzle nozzle
water supply pipe
water supply pipe
EV395 Detector EV395 Detector automatic shutter
Silo

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EDS - TECHNICAL INFORMATION
EV 395 SPARK DETECTOR
MECHANIC MOUNTING
fig.5
RIVELATORE EV395
staffa
parete della tubazione
viewing window
56.0
162.0
5.0
DS581A
EV395 - SPARK DETECTOR
finestra di visione
pipe surface
bracket

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EDS - TECHNICAL INFORMATION
EV 395 SPARK DETECTOR
DIMENTIONS
fig.6

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EDS - TECHNICAL INFORMATION
TECHNICAL INFORMATION
Spark Detector
EV - 395
The EDS EV-395 Spark Detector is an electronic device suited to
detect sparks in combustible materials transport pipes and
channels, headed to a storing silo.
During the transporting phase, a spark, produced in the previous
manifacturing stages, can be transported mixed with the materials.
If this spark is not detected and neutralized very quickly, once it
arrives inside the silo, it can cause a fire or an explosion.
So the precise and quick detection of the spark, can be used to
prevent great damages and dangers to both people and things and
consequently to elevate the security level of the installation.
The EV395 detector is able to reveal sparks that cross its viewing
range even if they have a great velocity (up to 100 km/h).
The detector is equipped with an optical head sensible to infrared
radiation, that has a viewing range of more than 90 degrees (solid
angle) and a suitable electronic circuit that provides the
amplification and managing of the signal.
When the EV395 detector intercepts a spark it provides the
powering of a relay suitable to switch on optical and acoustic
alarms. Moreover a fire extinguishing system ( splinker ) can be
activated.
For the former function it is suggested to use our EV 521 control
unit that has a great using flexibility.
If the pipes have a large diameter (over 0,5 m.) several EV395
detectors can be used to obtain a better security level .
If a water spraying automatic extinguishing system is also
present,the spark extinguishing can be verified.
ADVANTAGES
•signalling quickness and precision
•remote functioning test available
•solid metal box
•easy installation
•easy maintenance
APPLICATIONS
•wood industry:
sawdust
shavings
•textile industry:
cotton
all other fibres
•food industry:
cereals
If the transporting pipe has not a cylindric shape, for example squared
or rectangular, it can be necessary to use two opposed detectors, to
avoid dead zones external to the viewing range of the detector.
The detector's box is made of fusion light alloy with IP67 protection,
and so the internal electronics are protected from dust, shocks and
from ambient conditions, that can be also corrosive, permitting to
use the detector outdoor for a long time without any problem.
The maintenance of this detector is very simple and not frequently
required.
TECHNICAL DATA
•power supply: 24 V cc or ac
•power consumption: 20 mA (no alarm) - 50 mA (alarm)
•optical viewing solid angle: 90 degrees
•max detecting distance: about 50 cm
•sensitivity regulation
•regulation of relay powering time: 1-10 sec
•pins to connect a remote test button
•alarm LED
•output relay: 6A/24V
•fusion light alloy metal box
•protection index: P67
•dimentions: 140x135x85
•weight: 0,7 Kg

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EDS - TECHNICAL INFORMATION
water feed
pipe
electrovalve
pressure meter
EV395 spark detector
transporting
pipe
nozzle
water cone
Installation example with two EV395
Installation example with one EV395
shutter SILO

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EDS - TECHNICAL INFORMATION
TECNICAL INFORMATION
EDS-SRG-ET
- Pneumatic pistons: 2
- Material: galvanized steel
- Solenoid voltage: 220Vac, 110Vac, 24V ac,
24Vdc (specify when ordering)
VL-34-24 - electrovalve
- NC normally closed pilot operated
- Interception of liquid
- Body: brass and stainless steel
- Guide hose: stainless steel
- Connection: 3/4
- Differential pressure: 12 bar
SP__ - nozzle - material: OT
SP14F08 - connection: 1/4 "Female - 8 liters / mi-
nute
full cone 61 degrees
SP12M25 - connection: 1/2 "male - 18.6 l / m
full cone - 67 degrees
SP34F25 - connection: 3/4 "female-22 l / m
PRS-14-55 - pressure switch
- Pressure range: 2 to 5.5 bar
- Maximum pressure: 7 bar
- Rated current: 10A
- Exchange contact
- Execution: IP40
- Operating temperature: -35 to + 80 ° C
- Connection: G 1/4 "female
EDS 1335 - electromagnet
- Power: 24VDC
- Attraction force: 50 Kg
- Rated current: 46 mA
- Test button
- For control of fire door
Accessories for Spark
Detection Systems
- Max pressure: 20 bar
- Flow rate: 5 m3 / h (83litri/minuto)
- Electromagnet: 10 VA
- Voltage: 24VAC
- Service: continuous
- Temperature: -10 to + 60 ° C
- Protection: IP65
full cone - 67 degrees
SP34F7 - Attack: 3/4 "female-62 l / m
full cone - 92 degrees
SP34F32 - Attack: 3/4 "female-32 l / m
full cone - 90 degrees
SP12F10 - Attack: 1/2 "female-18 l / m
full cone - 67 degrees
SP12F120 - Attack: 1/2 "female-94 l / m
full cone - 90 degrees
- Minimum working pressure: 6 bar
- Closing time: 2 sec (diameter 200-480) -
3 sec (500-700) - 4 sec (750-1000)
- Position (horizontal / vertical): any
SIRLD-1 - sirena + lampeggatore
-- Power: 12/24Vcc-ca
- Orange
- Sound level: 105 dB
- Complete the basic BSP wall or BSM vertical