DURAG D-LX 100 All-In-One User manual

English 08/2004
DURAG GmbH
Kollaustraße 105 · D-22453 Hamburg · Tel. +49 40 55 42 18-0 · Fax +49 40 58 41 54
D-LX 100
All-In-One
Flame Scanner
European
Standard EN 230: 1991
Gas appliance
directive
90/396/EWG
Pressure equipment
directive
97/23/EG
Fuel Oil Gas Oil + Gas
Register Number: 5F161/03 CE-0085AT0397 BAF MUC 03 04 072357 003
Tested by TÜV Süddeutschland
Approved for intermittent operation, continuous operation and 72-hour operation.
Registered by DVGW and DIN CERTCO
American Standard: UL 372 FM Class 7610
Registration Number: MH25226 3000072 and 3010410

!
Important Notice!
Flame monitors are safety relevant devices which shall ensure a safe
operation of furnaces.
Please read this manual carefully before setting the flame monitor into
operation.
The adjustment of flame monitors shall be carried out only by trained
staff. Therefore, DURAG offers suitable courses.
Flame Monitors are certified devices. Any modifications will result in a
loss of such certification. Repairs should be made only by the
manufacturer or its representatives.

D-LX 100
Table of Contents
1. General Information .........................................................................................................................1
2. Block Diagram ..................................................................................................................................2
3. Functional Description ....................................................................................................................3
4. Self-Check.........................................................................................................................................4
5. Fault ...................................................................................................................................................4
5.1. Error Codes of the 1st CPU: ......................................................................................................4
6. Installation.........................................................................................................................................5
6.1. Start-Up.....................................................................................................................................6
7. Programming the Flame Scanner...................................................................................................6
7.1. Setting the Flame Recognition Threshold.................................................................................7
7.2. Flame Recognition Thresholds as a Function of the Rocker Switch Setting............................8
7.3. Setting the Amplification............................................................................................................9
7.4. Adjusting the Flame Scanner D-LX 100…94Ex and D-LX 100…/95Ex ...................................9
7.5. D-ZS 087-20 Digital Display Unit ............................................................................................10
8. Safety Time .....................................................................................................................................10
9. Integrated Flame Scanner .............................................................................................................10
9.1. Ultraviolet Flame Scanner.......................................................................................................10
9.2. Infrared Flame Scanner ..........................................................................................................11
9.3. Selection Criteria for the D-LX 100 All-In-One Flame Scanner ..............................................12
9.4. Overview of D-LX 100 All-In-One Flame Scanner..................................................................12
9.5. Options....................................................................................................................................12
10. Technical Data ................................................................................................................................13
10.1. Technical Data of the Integrated Flame Scanner ...................................................................13
10.2. Technical Data and Configuration of Inputs and Outputs.......................................................13
10.3. D-LX 100 Dimensional Drawing..............................................................................................14
10.4. D-LX 100 Wiring Diagram .......................................................................................................15
10.5. D-LX 100 … /94 Ex and D-LX 100…/95Ex Housing for Hazardous Areas ............................16
10.6. Wiring Diagram for D-LX 100…/94Ex and D-LX 100…/95Ex.................................................17
10.7. D-LX 100 … /96 Ex for Hazardous Areas Class I, Div. 2, Group A,B,C&D............................18
10.8. D-LX 100 … /97 Ex for Hazardous Areas Zone 2...................................................................19
10.9. Cable and Shielding................................................................................................................20
11. Maintenance and Service ..............................................................................................................21
11. 1 Replacement of the Shutter and the UV-Photocell on the D-LX 100 UL.............................21
12. Available Accessories ...................................................................................................................23
12.1. D-ZS 087-20 Digital Display....................................................................................................23
12.2. D-NG 24/05 AC-Power Supply ...............................................................................................24
12.3. D-ZS 033-I Ball Type Adjustment Flange ...............................................................................25
12.4. D-ZS 033-III Ball Type Adjustment Flange .............................................................................26
12.5. Weather Protection Hood........................................................................................................27
13. Approvals ........................................................................................................................................28
13.1. DIN-CERTCO..........................................................................................................................28
13.2. EC Gas Appliance Directive 90/396/EC .................................................................................28
13.3. EC Pressure Equipment Directive 97/23/EC ..........................................................................29
13.4. UL-Listing ................................................................................................................................29
13.5. CUL-Listing .............................................................................................................................30
13.6. FM-Listing ...............................................................................................................................30
13.7. ATEX Certificate......................................................................................................................31
13.8. EC Declaration of Conformity .................................................................................................32

D-LX 100
Illustrations
(Fig. 1) D-LX 100 block diagram ......................................................................................................2
(Fig. 2) D-LX 100 with D-ZS 087......................................................................................................3
(Fig. 3) Location of fuses..................................................................................................................5
(Fig. 4) Flame recognition thresholds as function of the rocker switch setting ................................8
(Fig. 5) Adjusting an explosion-proof flame scanner........................................................................9
(Fig. 6) Dimensional drawing: D-LX 100 .......................................................................................14
(Fig. 7) Wiring diagram: D-LX 100…-P, D-LX 100…/96Ex and D-LX 100…/97Ex........................15
(Fig. 8) Dimensional drawing: Ex-proof housing type K.................................................................16
(Fig. 9) Wiring diagram: D-LX 100…/94Ex and D-LX 100…/95Ex ................................................17
(Fig. 10) Dimensional drawing: D-LX 100…/96Ex ...........................................................................18
(Fig. 11) Dimensional drawing: D-LX 100…/97Ex ...........................................................................19
(Fig. 12) Cable and Shielding...........................................................................................................20
(Fig. 13) Power supply and error suppression .................................................................................20
(Fig. 14) Shutter-Block with UV Cell.................................................................................................21
(Fig. 15) Layout of the Shutter block with the UV-Cell .....................................................................22
(Fig. 16) Dimensional drawing: D-ZS 087-20...................................................................................23
(Fig. 17) Dimensional drawing: D-NG 24/05 ....................................................................................24
(Fig. 18) Dimensional drawing: D-ZS 033-I ball type adjustment flange..........................................25
(Fig. 19) Dimensional drawing: D-ZS 033-III ball type adjustment flange........................................26
(Fig. 20) Dimensional drawing: D-WSH 603 ....................................................................................27

D-LX 100 Page 1
1. General Information
The D-LX 100 All-In-One Flame Scanner consists of a control unit and an optical flame scanner. The
flame scanner is suitable for monitoring flames from a variety of fuels and combustion techniques,
particularly in single burner applications. Uses for this flame scanner include remote heating stations,
chemical processes or thermal flue gas combustion systems.
The D-LX 100 All-In-One Flame Scanner offers an extremely high degree of safety and availability by
using two microprocessors operating in parallel, with corresponding hardware and software. The
hardware is designed to follow all EC guidelines and laws relevant to electromagnetic compatibility.
Thanks to the fail-safe design of the hardware, and the software’s continuous checks of all safety-
related functions, the D-LX 100 meets the European standards EN 230 (oil) and EN 298 (gas), as well
as technical guidelines for steam boilers TRD 411 to 414 and TRD 604 for intermittent, continuous
and 72-hour operation.
In order to accurately monitor various types of flames and combustion conditions, five different models
are available, with spectral sensitivities in the UV and IR spectrums.
The flame recognition threshold for the flame scanner can be programmed to one of ten different
settings using a push button switch on the front panel. The scanner’s safety time, which refers to the
number of seconds before the scanner will signal flame outage, is set at the factory to 1 s. Longer
safety periods of 3 or 5 s may be programmed in upon request.
If one chooses the most suitable All-In-One flame scanner, positions it correctly on the sighting tube,
and properly sets the threshold, one will always be able to selectively monitor single burners or even a
furnace.
The essential operational groups of the control unit are depicted in the D-LX 100 block diagram (fig.
1):
•Dual-channel microprocessor systems for control and oversight of flame monitoring functions.
•Integrated flame scanner with shutter drive for performing self-checks.
•Dynamically driven fault relay, K1; internal operating voltages and all safety-related hardware
functions are monitored.
•Guided flame relay, K2, with self-checking circuit.
•Programmable flame recognition threshold
•LED display for indicating operational readiness, flame signal or fault.
•4-20 (or 0-20) mA analog output for external display of flame intensity.

Page 2 D-LX 100
2. Block Diagram
F2
UB
F1
L- L+ PE
RAZ
UB 0V
K1.2
K1.1
K1
K2 K2.2
0V
LX100-01-004
Read back
flame relay
Shutter
Photo element
Flame ON
Power supply
ready for operation
Data compare
Synchronization
Power
supply
Internal reset Dynamic
safety circuit
LED
indicator
Current output
0 / 4 - 20mA
Flame intensity
Flame
threshold
Safety time
soldering field
Amplifier Filter Pulse stage
Flame Monitor UL / UA / UAF / IS / IG
Pulse
(Fig. 1) D-LX 100 block diagram

D-LX 100 Page 3
3. Functional Description
The photo elements used in the integrated optical flame scanner evaluate different spectral ranges of
the flame. Those scanners with semiconductor photo elements cover ranges from short-wave UV-A
to infrared. The signal from the photo element passes through an amplifier with suppression of any
constant (non-dynamic) emitted energy. This amplifier can be set to one of two different levels. After
the amplifier, the signal runs through a high-pass filter and a pulse generation stage.
DURAG also offers a D-LX 100 flame scanner employing a UV photocell, which can monitor flames in
the UV-C range, where wavelength is very short. In this range it is unnecessary to suppress any non-
dynamic flame energy. This makes it possible to evaluate the often very high portion of constant
energy generated by the flame. Due to the way the photocell operates, it is unnecessary to equipped
this integrated flame scanner with an amplifier, high-pass filter or pulse generation stage. The cell
itself generates pulses using the voltage supply via an RC reset circuit.
The pulses generated by the integrated flame scanners, which offer a measure of the flame intensity,
are transmitted to the microprocessor system and will trigger a flame ON or OFF signal, depending on
the flame recognition threshold programmed in.
Three features are available for the flame signal: 1) a fail-safe relay contact, K2, 2) a green LED on
the front panel, and 3) a current output for display of the flame intensity. The current output is set at
the factory to either 4-20 or 0-20 mA.
Both operational readiness and fault status are signaled via a contact in the K1 fault relay, and either a
yellow (ready) or red (fault) LED on the front panel.
The DURAG D-ZS 087-20 Display Unit may be plugged into the jack on the front panel. This device
displays the flame intensity as a pulse signal between 0 and 4095 pulses/sec. and further aides in
setting the proper flame recognition threshold.
D-LX100
9
0
9
0
D-ZS087
D-ZS087
D-ZS 087- 20
Reset Mode
V2V1
Gain selection (covered by housing) Status display
Digital Display D-ZS 087-20
(only for setup)
Reset button
Connection for D-ZS 087-20
Flame threshold adjustment
(Fig. 2) D-LX 100 with D-ZS 087

Page 4 D-LX 100
4. Self-Check
The D-LX 100 All-In-One Flame Scanner is fail-safe and self-checking, in accordance with European
EN standards for flame scanning equipment. After power-up, the flame scanner performs a self-
check, which is constantly performed during continuous operation.
If employed for continuous operation, any component failure that jeopardizes the safety-related
functions of a scanner must trigger an error shutdown. The D-LX 100 is therefore equipped with a
dual-channel microprocessor system. This system controls all functions and self-checks, and
monitors all safety-related timing sequences. Input and output status is independently checked and
compared by the microprocessors. Only if they agree is operation allowed to continue.
If the controller signals flame ON, the integrated flame scanner is automatically monitored. This
occurs every second for 0.2 s via the activation of a shutter. The shutter is a transistor separating the
photo element from the electronics. In the case of the D-LX 100 UL, a long-lasting mechanical shutter
is used to interrupt the path from the photo element to the electronics. The interruption of the
photocurrent simulates the outage of a flame and must result in a drop in the flame signal that was
present during the 0.8 s that the scanner was monitoring the flame. If a hardware problem causes too
little a decrease in the flame signal, an error shutdown will occur after eight such cycles, that is, after
eight seconds.
If the flame ON signal is stopped, the integrated flame scanner is also no longer checked.
5. Fault
If the internal self-check recognizes an error in the safety-related software and hardware components,
an error shutdown and internal lockout must be triggered. The relays for the flame, operational
readiness and fault signals are released, and the red LED on the front panel will begin blinking. The
contact from K1 signals the present fault.
The red LED blinks 5 times by itself. After that, the yellow LED will also begin blinking with the red.
The number of times that the yellow LED blinks corresponds to the type of error, which allows the
operator to precisely analyze the source of the fault. The following error sources can be signaled:
5.1. Error Codes of the 1st CPU:
Error
Code
Yellow
LED
Blinks
Source of Error Possible Cause of the Error
1. 1 x Synchronization defective / faulty microprocessor circuit
2. 2 x 2nd CPU 2nd CPU is indicating an error (no display of its own)
3. 3 x FOS cycle defective cycle generation / faulty acknowledgment
4. 4 x Flame signal relay defective drive / faulty acknowledgment
5. 5 x Flame signal contact defective / faulty acknowledgment of the contact
position
6. 6 x Status signal relay defective drive / faulty acknowledgment
7. 7 x Flame comparison faulty transmission of flame data
8. 8 x Flame recognition
threshold
push button switch on front panel pressed by
unauthorized personnel
9. 9 x Safety time unauthorized change in the soldering field
10. 10 x PROM test defective / faulty microprocessor circuit
11. 11 x RAM test defective / faulty microprocessor circuit
12. 12 x Flag test defective / faulty microprocessor circuit
13. 13 x CPU test defective / faulty microprocessor circuit

D-LX 100 Page 5
If the cause of the error is a defect in the integrated flame scanner,
the red and green LED’s will blink alternately.
Pressing the reset button on the front panel of the D-LX 100 acknowledges a fault in the unit and
allows flame scanning functions to continue after restart. When the reset button is pressed, all LEDs
will go off. It is also possible to reset the unit by open the plug connection or by interrupting the yellow
24 V supply wire for a short moment. In this case the cover of the flame scanner don’t has to be
opened in order to get access to the reset button.
If the power supply is interrupted or the reset button is pressed, the relays are released, regardless of
the status of the unit (flame signal ON / OFF or fault). The flame scanning program is then restarted.
Note:
The D-LX 100 is an officially approved flame scanner. Any tampering or modifications will lead to a
loss of its approved status. Repairs may only be performed by the manufacturer or its authorized
service outlets.
6. Installation
Installation occurs according to the D-LX 100 dimensional drawings. The electrical installation must
be performed in accordance with the wiring diagram in this manual, as well as any local guidelines.
The location of fuses F1 and F2 can be found in the dimensional drawing.
The enclosure rating of the flame scanner is IP67 if it is a model with the plug connection, and IP65 if
the scanner has a permanently threaded cable connection.
D-LX100
9
0
9
0
D-ZS087
D-ZS087
V2V1
No6
No4
F2 = Flame contact fuse
F1 = Mains fuse
(Fig. 3) Location of fuses
Note: To change the amplification or to replace the fuses, the electronics must be pulled from the
housing. Due to the D-LX 100‘s compact design, one must observe that no wires get pinched when
putting the scanner back together. The housing should be closed without using excessive force.

Page 6 D-LX 100
To guarantee the best, most selective flame monitoring, one must determine the correct position of the
scanner, since the flame must be visible to the flame scanner at all times, regardless of the load range
of the burner. The 6°angle of view should always be oriented toward the root of the flame, that is, the
bottom third of the flame. The D-LX 100 is mounted onto a sighting tube with a 1¼” pipe (male thread
connection). A D-ZS 033-I adjustable ball joint flange is available to more easily align the scanner
with the flame.
The flame scanner’s purge air connection is responsible for keeping the sighting tube and optics free
of particles from the combustion chamber. A current of air, strong enough to blow away heavier
particles, must therefore be aimed toward the combustion chamber. In applications with low particle
levels, like gas burners, a purge air velocity of v = 3 ft/s (1 m/s) in a 1¼” sighting tube will sufficiently
purge the scanner (air consumption 100 ft3/h [3m3/h]). Those with higher levels, like coal-fired
burners, require more purge air (v = 10 ft/s [3 m/s]). These velocities for the purge air in the sighting
tube are only guidelines. Changes on a site-specific basis are certainly permissible. The scanner is
equipped with ½” female pipe connection for the purge air.
The flame scanner should be routinely checked to ensure that the optics are clean and that the
scanner is firmly mounted to the sighting tube.
For optimal alignment of the flame scanner, the D-LX 100 uses a 4-20 mA (or 0-20 mA, if desired)
current output which displays the flame intensity. Note: the current output leads are not galvanically
separated from the internal voltage supply. To avoid having faults attributed to the flame scanner,
these leads may need to be shielded. As a rule, however, shielding is not required for cable lengths
below 15 ft (5 m).
For high availability in the system, the power supply equipment and the flame scanner must be
properly timed (power supply and maximum time for outages). In order to avoid possible interference
in the grounded lead from any transient currents (e.g., current from an ignition device against ground
potential), DURAG D-ZS 117-I insulators may be used between the sighting tube and the flame
scanner. One must make certain, however, that the pipe or hose conduit for the scanner’s purge air
connection is also made of non-conducting material.
!
When connecting the flame scanner, all local regulations must be observed.
The flame scanner is equipped with a safety screw to ensure that the scanner
is firmly in place. Always be certain that the flame scanner has been mounted
properly.
6.1. Start-Up
Once mounted and connected according to the drawings and diagrams in this manual, the D-LX 100
All-In-One Flame Scanner is immediately ready for operation once power is supplied.
7. Programming the Flame Scanner
The flame scanner is equipped with a push button switch for adjusting the flame recognition threshold
of the flame relay. This threshold may be set to one of ten levels. The scanner is also equipped with
a hook switch for adjusting the amplification of the photo current to one of two different levels. This
amplification feature is unnecessary for the D-LX 100 UL, and is therefore not found on that scanner.
The push button switch is accessible after removing the cover plate. The hook switch is still obscured
by the housing even if the cover plate has been removed, since it is only intended to be switched
under special circumstances for dampening very high flame signals.

D-LX 100 Page 7
7.1. Setting the Flame Recognition Threshold
By setting the flame recognition threshold on the flame scanner, the operator of the combustion
system determines whether the flame signal (pulse frequency) of the integrated flame scanner should
generate a flame ON or flame OFF signal. This threshold is set using the push button switch on the
front panel, and may be programmed to one of ten settings. After start-up, the threshold setting must
be protected from unauthorized changes.
Switch setting ”0” is the highest threshold. The flame scanner must generate a strong flame signal in
order to register flame ON. Position ”9” is the lowest threshold. A weak flame signal is sufficient to
trigger and maintain a flame ON signal.
!
The operator uses this threshold setting to determine
when the flame scanner signals flame ON or OFF.
The green (flame ON) LED and the 4-20 mA (or 0-20 mA) analog output for flame intensity may be
used to select the proper switch position. However, use of the D-ZS 087-20 Digital Display Unit is
recommended. When setting the flame recognition threshold, one must always consider the possible
influence of ambient light. This can play a role both in multi-burner and single burner applications.
Flame OFF Setting:
If the burner is shut down, the flame recognition threshold (switch-on threshold) must be set high
enough that the flame scanner does not see any ambient light and reliably signals ”Flame OFF”:
•the green ”Flame” LED is not illuminated,
•the current in the flame intensity measurement circuit is less than 8 (or 5) mA,
•the fail-safe relay output to the external flame ON signal is open.
Flame ON Setting:
If the burner is operating, the flame signal must reliably exceed the flame recognition (shut-off)
threshold and signal ”Flame ON”:
•the green ”Flame” LED is illuminated,
•the current in the flame intensity measurement circuit is greater than 12 (or 10) mA
•the fail-safe relay output to the external flame ON signal is closed.
Example:
The flame recognition threshold is set on site such that a flame ON signal is reliably present given
sufficient flame intensity, under all load conditions. That is to say, the flame intensity current display
fluctuates between 12 (or 10) and 20 mA. If the flame image deteriorates too much, the flame signal
(pulse frequency) must dip below the shut-off threshold. The safety time programmed into the
scanner will then begin to run. After the safety time expires, the flame OFF signal is given and the
green LED goes out (flame intensity current is less than 8 (or 5) mA).
!
Once the scanner’s alignment and flame recognition threshold have been
properly determined, the D-LX 100 must reliably report if a burner is shut down
or if an impermissible deterioration of the flame image occurs. Consideration
must be given in order that ambient light sources do not generate faulty system
status. The operator must see to it that the settings are never changed by
unauthorized personnel.
If the flame recognition threshold is changed, one must be aware that if the push button is not pressed
all the way, it is possible to have the scanner programmed to an intermediate setting, between
settings 1 and 2, for example. If the switch is stuck in one of these undefined settings for more than 8
s, an error shutdown will occur.

Page 8 D-LX 100
7.2. Flame Recognition Thresholds as a Function of the Rocker Switch Setting
Rocker Switch
Setting
Beginning of
Range 0/4 mA
Shut-off
Threshold 5/8 mA
Switch-On
Threshold 5/8 mA
End of Range
20 mA
0 2048 2560 2816 4095
1 1536 1984 2208 3328
2 1024 1431 1634 2650
3 768 1088 1248 2048
4 608 894 1036 1750
5 384 626 746 1350
6 256 448 544 1024
7 128 288 368 768
8 * 64 132 166 336
9 32 56 68 128
• The flame recognition threshold is set to position 8when delivered from the factory
0
500
1000
1500
2000
2500
3000
3500
4000
4500
0123456789
UG110-02-001
Rocker Switch Setting
Pulse frequency
Beginning of Range 0 / 4 mA
Shut-Off Threshold 5 / 8 mA
Switch-On Threshold5 / 8 mA
End of Range 20mA
(Fig. 4) Flame recognition thresholds as function of the rocker switch setting

D-LX 100 Page 9
7.3. Setting the Amplification
In most cases it is unnecessary to set the amplification of the photo element signal. However, if signal
saturation should occur due to a very intense flame signal, the amplification hook switch can be
moved from position V2 to position V1. As mentioned above, this is not a feature of the D-LX 100 UL.
Switching to V1 reduces signal amplification by a factor of three.
The hook switch is mounted near the photo element. The housing must be removed in order to gain
access to it. The four Allen screws must be loosened and the electronics insert pulled from the
housing.
When putting the housing back together, the housing’s o-ring must be in the correct position, and the
cable bundle must lie inside the housing such that the electronics can be re-inserted without using
excessive force and without pinching the cable bundle. Once the housing is back in place, the Allen
screws must be screwed back in.
7.4. Adjusting the Flame Scanner D-LX 100…94Ex and D-LX 100…/95Ex
When operating a flame scanner in a hazardous location, an explosion-proof housing is required.
Given the special design of this housing, different steps must be followed when programming the
scanner.
!
Explosion Hazard!
Before opening the housing in any hazardous location (e.g. explosive
atmosphere), the flame scanner must be disconnected from its power
source.
Unless asked by the customer to do otherwise, the flame recognition threshold is set to 8 and the
amplification is set to V2 (high amplification; does not apply to the D-LX 100 UL). If changes are
necessary, the procedure outlined below must be followed:
1. The flame scanner must be disconnected from the power source. All cable connections must
therefore be disconnected.
2. The four M5x25 mm screws (4 mm Allen screws) must be unscrewed from the front part of the
housing.
3. Carefully separate the housing. Because of the inner gasket and narrow gaps, greater force is
required.
4. The flame scanner may now be programmed.
5. After the required settings have been made, the housing may be reassembled. One must be
careful not to pinch or damage the connection cable.
6. Screw in the four M5x25 mm screws (4 mm Allen screws).
7. Reconnect the cable.
D-LX100
9
0
9
0
D-ZS087
D-ZS087
V2V1
M5x25 mm screw (4 mm Allen screw)
M5x25 mm screw (4 mm Allen screw)
(Fig. 5) Adjusting an explosion-proof flame scanner

Page 10 D-LX 100
7.5. D-ZS 087-20 Digital Display Unit
By connecting the D-ZS 087 display unit, the flame intensity can be displayed as a pulse signal, from
0 - 4095 pulses. Furthermore, the minimum and maximum values are stored, and the thresholds for
the flame ON and flame OFF ranges are calculated. This allows the operator to determine the optimal
threshold between ambient light (relay must remain in the OFF position) and flame (relay must remain
in the ON position, even if flame intensity is minimal).
8. Safety Time
The safety time is the response time of the flame scanner to the outage of the flame signal (pulse
frequency of the integrated flame scanner) and the resulting shut-off of the relay contact for the flame
ON signal.
The D-LX 100 has a standard safety time of 1 s. Safety times of 3 and 5 s are available upon request.
Should the safety time need to be changed, the following steps must be followed:
9. Integrated Flame Scanner
In order that the flame scanner can be used in burner applications with the widest variety of fuels, 3
UV and 2 IR flame scanner models are available. All flame scanners with a semiconductor photo
element have the same electronic shutter in common. The scanners use this shutter to perform a
continuous check of the internal signal amplifier and filter. The signal amplifier can be set to one of
two levels. Amplification level V2 is higher than V1 by a factor of three. The scanner comes from the
factory having been set to V2.
DURAG also offers a UV flame scanner with a UV photocell. For performing self-checks, the scanner
is equipped with a newly developed, long-lasting shutter which interrupts the path to the photocell.
Because of the way the UV cell operates, it is not possible, or required, to switch from one
amplification level to another since no saturation will occur.
9.1. Ultraviolet Flame Scanner
The UV zone of a flame is in general considerably smaller than the IR zone. Moreover, boiler walls
and components do not radiate any dynamic UV energy. UV flame scanners are therefore very
selective and not sensitive to ambient light.
The D-LX 100 UL uses a photocell with a spectral sensitivity of λ= 185 nm to 260 nm. Because this
spectral range is so narrow and distant from that of daylight, it is permissible to evaluate both the
dynamic and static energy of the flame. This important advantage makes the D-LX 100 UL a highly
sensitive flame scanner, with excellent selectivity for all flames releasing energy in the UV-C range,
e.g., gas and oil flames.
A semiconductor photo element with a spectral sensitivity of λ= 190 nm to 520 nm is employed in the
D-LX 100 UA. The integrated flame scanner acquires the dynamic blue-to-transparent range of gas,
oil and coal flames, without suffering signal collapse due to water vapor, recirculation gas or similar
UV-absorbing gases.
In the D-LX 100 UAF, the photo element from the D-LX 100 UA is used with a filter. Because of this
filtering, a reduced spectral range of λ= 280 nm to 410 nm results. This delivers better results in
cases of very intense UV radiation or if higher selectivity is required. Note: in the visible spectral
range the filter does not appear transparent—it appears black to the human eye. The photo element
is, however, visible through the lens of the flame scanner.

D-LX 100 Page 11
9.2. Infrared Flame Scanner
The IR zone of a flame is in many cases large and, relative to UV radiation, very intense. The IR zone
is easy to acquire under different angles of view, is strong in signal, and is not sensitive to absorption
by gases. Compared to a UV flame scanner, however, it is more sensitive to ambient light.
A silicon photo element with a spectral sensitivity of λ= 300 nm to 1100 nm is used in the D-LX 100 IS.
This flame scanner detects visible light. If the flame is red or gold in color, it is ”visible” to the scanner,
on the pre-condition, however, that there is movement in the flame, i.e., the flame is dynamic.
The D-LX 100 IG A employs a germanium photo element with a spectral sensitivity of λ= 780 nm to
1800 nm. The integrated flame scanner will therefore acquire the dynamic range of radiation
generated by nearly all fuels. This type of flame scanner is strong in signal, but demonstrates lower
selectivity due to the large IR zone.
Flames whose short-wave UV radiation is absorbed by dust, water vapor or other materials can be
monitored in the IR range. Applications include waste incinerators and oil-fired combustion systems.
In the case of the latter, IR monitoring in the spectral range of 300 to 1100 nm is typical.
IR flame scanners with a spectral sensitivity up to 1800 nm have proven themselves especially
effective in applications employing measures for NOxreduction, e.g., flue gas re-circulation or
systems with combination burners for gas and oil.
Note:
It can occur in practice that static emitters, like glowing boiler components, become modulated by
combustion air currents or flue gas clouds, and work like ambient light with dynamic portions of
radiation. Should this radiation lie in the range received by the scanner, i.e., in the IR spectrum, and
within the normal flicker frequency range (approx. 10 to 200 Hz), an output signal will be generated by
the flame scanner in the form of a pulse frequency corresponding to the intensity and dynamics of the
received radiation. The flame recognition threshold (pulse threshold) of the D-LX 100 may not in this
case be exceeded by the pulse frequency of the integrated flame scanner and cannot be allowed to
trigger a flame ON signal (see section 6: Setting the Flame Recognition Threshold on the Flame
Scanner).

Page 12 D-LX 100
9.3. Selection Criteria for the D-LX 100 All-In-One Flame Scanner
Model Spectral Suitable for Following Fuels Characteristics
Range [nm] Gas Oil Coal Wood
D-LX 100 UL 185 – 260 ++ +
Monitoring of gas and oil flames
D-LX 100 UA 190 - 520 ++ ++ {Monitoring of gas and oil flames; also for low-NOx
combustion.
D-LX 100 UAF 280 - 410 + ++
Monitoring of very intense gas and oil flames; also for low-
NOxcombustion.
D-LX 100 IS 300 - 1100 ++ + +
Monitoring of oil burners, even if additional fuels are also
combusted.
D-LX 100 IG 780 - 1800 {+ ++ ++
Monitoring of oil and wood flames, as well as coal flames.
Explanation of symbols:
++ Flame scanner is ideally suited for this fuel.
+Flame scanner is well suited for this fuel.
{Flame scanner is conditionally suited for this fuel. The monitoring characteristics depend for the most part on the
combustion technique.
!Due to local regulations the flame sensor might not be approved for monitoring of gas flames.
This information is based on years of experience in a great proportion of combustion systems. Variations due to differing flame
behaviour, caused by special combustion techniques cannot be taken into account or excluded. Therefore, deviations from table
are possible.
9.4. Overview of D-LX 100 All-In-One Flame Scanner
Axial Plug Connection Flameproof housing
II 2G EEx de IIC T6
Flameproof housing
Class I, Division 1
Group B,C&D
Version for
Class I, Division 2
Group A,B,C&D
Version for
II 3G EEx nC IIC T6
D-LX 100 UL-P D-LX 100 UL/94Ex D-LX 100 UL/95Ex D-LX 100 UL/96Ex D-LX 100 UL/97Ex
D-LX 100 UA-P D-LX 100 UA/94Ex D-LX 100 UA/95Ex D-LX 100 UA/96Ex D-LX 100 UA/97Ex
D-LX 100 UAF-P D-LX 100 UAF/94Ex D-LX 100 UAF/95Ex D-LX 100 UAF/96Ex D-LX 100 UAF/97Ex
D-LX 100 IG-P D-LX 100 IG/94Ex D-LX 100 IG/95Ex D-LX 100 IG/96Ex D-LX 100 IG/97Ex
D-LX 100 IS-P D-LX 100 IS/94Ex D-LX 100 IS/95Ex D-LX 100 IS/96Ex D-LX 100 IS/97Ex
9.5. Options
The D-LX 100 All-In-One Flame Scanner is normally delivered with the options listed in the table
below. Should other options be required, please make them known when ordering.
“Flame intensity” current output 0 - 20 mA 4 - 20 mA
Safety time 1 s 3 s 5 s
Note: the options shown in the shaded areas are standard; please indicate when placing an order
whether any of the other options shown are desired instead.

D-LX 100 Page 13
10. Technical Data
•Permissible ambient temperatures:-20°C…+60°C (0°F…+140°F,
(other temperatures upon request)
•Safety time:.....................................1 s (other times available upon request)
•Permissible operating modes:........intermittent and continuous operation; 72-hour operation in
systems operating according to TRD 604
•Enclosure rating (EN 60529):.........IP67 (rating not associated with FM logo mark)
•Sighting tube connection:...............G1¼”
•Purge air connection: .....................G½”
•Electrical connection: ...................1.5m (5 ft.) cable (8 conductor, 1 mm² / 18 gauge),
T = -60 to +180°C (-80°F to 360°F)
•Weight: ...........................................approx. 1.8 kg (4 lb.)
10.1. Technical Data of the Integrated Flame Scanner
•Optical angle of view ......................6°; for the D-LX 100 UL: 6°horiz., 12°vert.
•Spectral sensitivity..........................185 nm – 260 nm D-LX 100 UL
190 nm - 520 nm D-LX 100 UA
280 nm - 410 nm D-LX 100 UAF
300 nm - 1100 nm D-LX 100 IS
780 nm - 1800 nm D-LX 100 IG
•Flame scanner amplification: .........2 levels: standard V2= V1x3, (not D-LX 100 UL)
10.2. Technical Data and Configuration of Inputs and Outputs
•Connection to power supply...........L+, L-, PE / grounded lead
•Power supply:.................................24 VDC ±20%, approx. 5 W
•Fuse protection:..............................F1= 0.315 A, semi-slow, MST 250
•Current output 0 / 4 - 20 mA ..........Flame intensity / 150 Ohm maximum load
•Flame contact.................................Closer; active if flame is present
•Fault contact...................................Closer; active if no fault is present
Series connection with the flame contact as possible second
shut-off path.
•Switching capacity of the relay contacts / fuse F2, slow, MST250:
min:.................................................10 VAC/dc, 10 mA
max:................................................250 VAC, 2.0 A / cosϕ=1,0 (resistive load), F2= 2A slow
1.0 A / cosϕ=0,4 (inductive load), F2= 1A slow
0.2 A / cosϕ=0,2 (inductive load), F2=0.2A slow
24 VDC, 0.5 A with spark extinc. F2=0.5A slow
110 VDC, 0.2 A with spark extinc. F2=0.2A slow
220 VDC, 0.1 A with spark extinc. F2=0.1A slow
The flame scanner is constructed such that there is potential separation between the power
supply (24 VDC) and the unit’s internal voltage (UB = 20 VDC / 5 VDC). The current output is
galvanically connected to the internal voltage.
The relay contact for the flame ON signal is delivered with a fuse, F2 = 0.5 A, slow, MST250, for
24 VDC voltage switches. If connecting other switch voltages, this fuse must be exchanged
accordingly.

Page 14 D-LX 100
10.3. D-LX 100 Dimensional Drawing
R1 1/4"
SW 46
WAF 46
80
92
90
ca. 93
152
243 mm
22
Purge air connection G 1/2"
Scanning tube connection G 1¼"
Viewing angle 6°
(D-LX 100 UL vert. 12°)
Cover
Set screw
(Fig. 6) Dimensional drawing: D-LX 100

D-LX 100 Page 15
10.4. D-LX 100 Wiring Diagram
7
8
3
1
2
5
4
6
!
lx100-04-004
F2
F1
0 Volt
0 / 4…20mA
D-NG 24/05
PE
L+
L-
L
N
L+
L-
A
C-Power Supply
AC Mains
DC Mains
Protective Earth
Protective Earth
Contact Circuit Supply
Not Connected
Plug M2
Flame Message ON
Ready for Operation
Flame Relay K2.2
Fault Relay K1.2
Flame Intensity
sw / BK
gn/ge
GN/YE
ge / YE
ws / WH
gn / GN
gr / GR
L1
N
(Fig. 7) Wiring diagram: D-LX 100…-P, D-LX 100…/96Ex and D-LX 100…/97Ex
!
The Flame-On-Message has to be supplied via fuse F2 on the “Contact Circuit
Supply” input. Only such components are allowed to be connected to the
output “Read for Operation” which are non-interacting. These components can
be for example the coil of a relay or a magnetic switch.
Then the flame relays contact is protected against contact welding in
accordance with EN 298.
Contacts K1.2 and K2.2 must be switched in series if the additional safety requirements for direct
shut-off of the entire fuel supply are to be fulfilled. These are specified in VDE0116, paragraph 8.7.2
/10.98 or TRD 604, pages 1 and 2 for 72-hour operation (steam boiler without constant supervision).

Page 16 D-LX 100
10.5. D-LX 100 … /94 Ex and D-LX 100…/95Ex Housing for Hazardous Areas
D-LX 100 …/94 Ex D-LX 100 …/95 Ex
LX100-08-003
M20x1.5
G 1”
1/2” NPT(F)
(Fig. 8) Dimensional drawing: Ex-proof housing type K
Explosion protection: ..................................... D-LX 100…/94Ex: II 2G EEx de IIC T6/T5
(PTB approved)
D-LX 100…/95Ex: Class I, Div. 1, Group B, C & D
(FM approved)
Max. ambient temperature: ........................... at T5 : -20°C to +70°C (-4°F to 158°F)
at T6 : -20°C to +60°C (-4°F to 140°F)
Viewing pipe connection: .............................. G 1” pipe thread
Optical viewing angle: ................................... 6° (D-LX 100 UL: 6°horiz., 12°vert.)
Weight:........................................................... 3.8 kg (8.5 lb.)
Enclosure rating:............................................ IP 65 (rating not associated with FM logo mark)
Cable entry: ................................................... D-LX 100…/94Ex: Cable gland M20x1.5
D-LX 100…/95Ex: ½” NPT (F) for conduit
connection
Conformity certificate:.................................... PTB 02 ATEX 1029 (D-LX 100…/94Ex ony)
Material:......................................................... AlCuMgPb
Painting:......................................................... Blue, RAL 5017 and black RAL 9005
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