IRIS S552B, S556B, S550B Operation And Application Manual
FLAME MONITORING SYSTEM
MODELS S550B, S552B and S556B VIEWING HEADS
OPERATION AND APPLICATION MANUAL
WORLD LEADER IN FLAME MONITORING
IRIS S55XX SERIES VIEWING HEADS APPLICATION MANUAL
TABLE OF CONTENTS
INTRODUCTION � 3
DIFFERENCES BETWEEN THE S550B AND S550 ........................................................................ 3
SIGNAL PROCESSOR COMPATIBILITY ......................................................................................... 3
MODEL S550B GENERAL DESCRIPTION ...................................................................................... 3
MODEL S552B GENERAL DESCRIPTION ...................................................................................... 4
FIGURE 1: WIRING TERMINATION DIAGRAM ............................................................................ 4
MODEL S556B GENERAL DESCRIPTION ...................................................................................... 4
VIEWING HEAD WIRING ................................................................................................................. 4
VIEWING HEAD INSTALLATION.................................................................................................... 5
FIGURE 2: CONNECTOR WIRING ................................................................................................... 6
SIGHT PIPE ..........� 7
PURGE AIR ..........� 7
VIEWING HEAD SIGHTING ............................................................................................................. 7
IR DETECTOR .....� 8
UV DETECTOR ...� 8
ORIFICING ..........� 9
DEFAULT SETTINGS FOR THE S550B ............................................................................................ 9
STORED VIEWING HEAD SETTINGS ........................................................................................... 10
ASSIGNING SETTINGS TO CHANNELS A AND B ...................................................................... 10
USING TWO VIEWING HEADS ON THE P520/P522 ................................................................... 10
BEFORE MAKING ADJUSTMENTS ..............................................................................................10
CALIBRATING THE S550B ............................................................................................................. 10
EXAMINING THE RESULTS OF GAIN SETTINGS FROM CALIBRATION .............................. 11
CHECKING OR CHANGING UV GAIN ......................................................................................... 11
CHECKING OR CHANGING THE IR FILTER ............................................................................... 12
CHECKING OR CHANGING IR GAIN ........................................................................................... 12
MANUAL SETUP OF THE S550B ................................................................................................... 12
RETURN TO DEFAULT SETTINGS ................................................................................................ 13
CONTACT INFORMATION ............................................................................................................. 13
FIGURE 3: VIEWING HEAD DIMENSIONS .................................................................................. 14
FIGURE 4: IR VIEWING HEAD LOCATION ................................................................................. 15
FIGURE 5: UV VIEWING HEAD LOCATION ................................................................................ 15
FIGURE 6: SIGHTING OPPOSED FIRED BURNERS .................................................................. 16
FIGURE 7: VIEWING HEAD MOUNTING ..................................................................................... 16
FIGURE 8: S550B PROGRAMMING FLOWCHART ..................................................................... 17
FIGURE 9: S552B PROGRAMMING FLOWCHART ..................................................................... 18
FIGURE 10: S556B PROGRAMMING FLOWCHART ................................................................... 19
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IRIS S55XX SERIES VIEWING HEADS APPLICATION MANUAL
INTRODUCTION
For the sake of simplicity, only the operation of the
S550B viewing head in combination with the P522
signal processor will be described in detail. The
S552B and the S556B will be discussed separately in
their respective sections.
The S550B, S552B and S556B can be used with
IRIS Models P531, P532 and later versions of the
Model P520 and P522 signal processors. Refer to
the respective processor manual for connection and
operation not described in this manual.
DIFFERENCES BETWEEN THE S550B AND S550
The Model S550B is basically the same in operation
as the earlier S550, except that a two line numeric
readout replaces the two color LED for displaying
and monitoring the UV and IR count rates. The displayed value is the pulse rate divided by 100.
The S550B provides an additional analog output that
can be measured as a current to ground. This can be
achieved by placing a 1000 ohm resistor in series with
the shield and the SGND terminal on the processor,
and monitoring the voltage across the resistor.
If the internal temperature of these viewing heads exceed 70° C, the temperature will be displayed once
every four seconds.
P522 AC signal processors. Some earlier manufactured P522 units may require an upgrade. All P531
and P532 signal processors are fully compatible with
these viewing heads.
Note: Source impedance resistors, 470 Ohm 1/4
Watt must be installed between SC and SGND for all
cable runs between 300 and 700 ft. from the signal
processor to the viewing head.
MODEL S550B GENERAL DESCRIPTION
The IRIS Model S550B is a dual channel, state-ofthe-art flame monitoring viewing head capable of
monitoring both the UV (ultraviolet) and IR (Infrared) components of a flame. This is accomplished by
utilizing two types of detectors, an IR solid state sensor and a UV Photo detector, together with a unique
dichroic beam-splitting mirror.
The S550B produces output pulse rates proportional
to the flame signal strength; the pulse rates are displayed at the front panel of the signal processor, and
at the rear of the viewing head. The S550B uses a
two line digital readout which displays the pulse rate
divided by 100. The upper readout displays the UV
count in green digits, and the lower readout displays
the IR count in red. This information can readily
be used to achieve maximum flame signal strength
while aiming and sighting the viewing head.
If the digits “99” are displayed, this indicates that the
IR sensor is saturating. Either reduce the IR “analog”
gain or install an orifice disc. (The IR analog gain is
the first digit of the IR gain).
The IR gain should be set so that the displayed
count is well below the saturation point (34 at the
viewing head, or 3400 at the signal processor) at
maximum firing rate. The signal processor and the
viewing head are designed to “Fail Safe” (Show
“No Flame”) in case of saturation. This may also
cause the pulse counter to start from zero, causing
the flame relay to de-energize.
In some applications, an orifice disk may be required
to discriminate between background radiation and
main flame. See ORIFICING on page 9.
SIGNAL PROCESSOR COMPATIBILITY
Viewing heads described in this manual are compatible with currently manufactured P520, P522 DC and
Certain parameters in the S550B, S552B and S556B
viewing heads can be selected or adjusted remotely
from the front panel of the signal processor. These
parameters are:
a) UV gain 0-99
b) Filter Selection 1: 16Hz
2: 24Hz
3: 33Hz
4: 52Hz
5: 75Hz
6: 100Hz
7: 155Hz
8: 215Hz
c) IR gain 0-699
Once adjusted, the new parameters are stored in an
EEPROM in the signal processor. If power is re-
PAGE 3
IRIS S55XX SERIES VIEWING HEADS APPLICATION MANUAL
WIRING SIDE VIEW - COVER REMOVED
CONNECT SHIELD
TO TERM 3
USE SHRINK TUBING
RED
GREEN
BLACK
WHITE
SHIELD
+V
GND
SC
SIG
GND
SIG
+24VDC
GND
SELF
CHECK
GND
SIGNAL
moved from the signal processor, which powers the
viewing head, and then reapplied, the signal processor automatically re-sends the stored parameters
to the viewing head. In addition, at the front panel
of the signal processor the operator may also select
“CAL”, a semi-automatic mode which will help to
speed up the setup. This is explained in detail in the
section CALIBRATING THE S550B , and further
illustrated in FIGURE 8: S550B PROGRAM-
MING FLOWCHART.
The S550B can be described as a dual-sensor viewing
head where the gain and filter selections are adjusted
and stored remotely by the signal processors to which
it is connected.
MODEL S552B GENERAL DESCRIPTION
The S552B viewing head is designed for IR sensing
only. It is basically an S550B without the UV capability, and a single line display. The IR pulse rate is
displayed in Red. The Signal Processor detects and
identifies the viewing head model to which it is connected, and will only allow adjustments related to that
model to be performed. In the Model S552B, these
adjustments are:
in FIGURE 9: S552B PROGRAMMING FLOW-
CHART,
MODEL S556B GENERAL DESCRIPTION
The S556B viewing head is designed for UV sensing
only. It is basically an S550B without the IR capability. The Signal Processor detects and identifies the
viewing head model to which it is connected, in this
case the model S556B, and will only allow adjustments related to that model to be performed. In the
Model S556B, this adjustment is:
a) UV gain 0-99
In addition, features such as CAL are limited to the
features of the attached viewing head, in this case the
S556B. These features are further illustrated in the
S556B PROGRAMMING FLOWCHART, shown in
Figure 10 on page 19.
VIEWING HEAD WIRING
Viewing heads are wired to the appropriate terminals
located on the bottom of the P522, P531 and P532
signal processors, and on the terminals located on the
rear PC Board of the P520. These terminals are listed
functionally in the table below.
a) Filter Selection 1-8
b) IR gain 0-699
In addition, features such as CAL are limited to the
features of the attached viewing head, in this case
the S552B. These features are further illustrated
TERMINAL DESCRIPTION
GND Power Ground
+V +24VDC Power to Viewing Head
SC Shutter Drive Signal to Viewing Head
SIG Flame Signal from Viewing Head
SIG GND Signal Ground
FIGURE 1: WIRING TERMINATION DIAGRAM
PAGE 4
IRIS S55XX SERIES VIEWING HEADS APPLICATION MANUAL
The diagram in Figure 1 shows the wiring of the viewing head connector to the signal processor using the
recommended IRIS type C328 cable. This cable has a
UL ITC rating and can be used in the US in hazardous
locations. Note that the flame signal wire is shielded,
and that the shield is terminated at both ends.
The shield is used as the signal ground wire which
goes to terminal SIG GND on the signal processor,
and to pin 3 on the viewing head plug. The shield
must be a braided type for this application in order to
maintain an electrical path. For this reason, a foil type
shield should not be used. This signal ground shield
is also the self-checking or shutter drive circuit return
path. It is recommended that the IRIS C328 cable be
used for all applications.
Connection of the IRIS type C328 cable to the viewing head plug is shown on the following page in FIG-
URE 2, CONNECTOR WIRING, and should be
done as follows:
Remove the cable entry nut from the plug housing.
Remove the rubber grommet and flat sealing washer.
With a pair of long-nosed pliers remove the center
ring only of the rubber grommet.
1. Strip 2 inches of the cable outer cover from the
cable removing any cellophane wrap or filler
material. Strip the insulation from the shielded
wire (if insulated over shield) a full 2 inches to
expose the shield.
2. Slide the shield back until a bulge develops close
to where the wire exits the cable outer covering.
3. Carefully spread a few strands of the shield at
the bulge (making sure not to break any strands)
to create an opening and pull the wire out of
shield through opening.
4. Carefully return shield to original shape and
length by pulling gently, then cover the shield
with heat shrink tubing to insulate it.
5. Slide the nut (with threads toward the cable end),
the washer and the grommet approximately six
inches onto the cable.
6. Slip the cable through the bottom opening of the
connector making sure that the cable outer jacket
is secure under the cable clamp and tighten the
two screws on the cable clamp.
7. Reassemble the grommet, flat washer, and cable
entry nut and tighten.
8. Strip each wire 3/8” as shown in the assembly
drawing figure 2 on the following page.
9. Proceed to wire the connector as follows: (Refer
to the wiring diagram figure 1 for terminal locations.)
Connect the viewing head signal wire (the shield-
ed wire) WHT to terminal No. 1 by inserting
into opening and then tightening the retaining
screw.
Connect the self-checking signal wire BLK to
terminal No. 2.
Connect the signal ground shield from WHT wire
with shrink tubing to terminal No. 3.
Connect the + 24VDC power wire RED to termi-
nal No. 4.
Connect the power ground wire GRN to terminal
No. 5.
Assemble the back of the plug and insert the
jackscrew through plug assembly.
The cable at the signal processor end should be prepared
in a similar way to the plug end, particularly the shield
from the WHT wire. Follow the wiring connections as
shown in the wiring diagram figure 1, making sure that
the shield does not touch the other adjacent terminals.
VIEWING HEAD INSTALLATION
Before beginning the actual installation, determine
the best location for mounting the viewing head based
upon the following factors:
PRESSURE: The viewing head lens will with-
stand 5 psi. If the lens assembly is exposed to
greater than 5 psi through the sight pipe, then
an isolation unit must be used. An IRIS isolation unit with purge air entrance model ISO/
Unit is available as an accessory.
TEMPERATURE: The viewing head will with-
stand an ambient temperature to 80° C (176°
F). However, the case temperature of the
housing must not exceed 60° C (140° F).
PAGE 5
IRIS S55XX SERIES VIEWING HEADS APPLICATION MANUAL
IRIS C328 CABLE
3 CONDUCTORS PLUS 1 COAX
3CONDUCTORS: 16 AWG 19 STRAND INSULATED WITH
CROSSED-LINKED-POLYETHYLENE .017 THK
COLORS: BLACK-RED-GREEN
1 COAX: 16 AWG 19 STRAND INSULATED WITH
CROSSED-LINKED-POLYETHYLENE .017 THK
COLOR WHITE
36 AWG BRAIDED SHIELD 90% COVERAGE
WITH .012 THK JACKET COLOR BLACK
CABLED: POLYPROPYLENE FILLERS FOR ROUNDNESS
JACKET: CROSSED-LINKED-POLYETHYLENE
STRIP 3/8" TYPICAL
GROMMET
FLAT WASHER
CABLE ENTRY NUT
SHIELD *
CABLE
PREPARATION
1
3
/
4
"
(
T
Y
P
)
CABLE
CABLE CLAMP
CONNECTOR WITH
REAR COVER REMOVED
INSULATE SHIELD WITH SHRINK
TUBING LEAVING 3/8" STICKING OUT
CONNECTOR JACKSCREW
FINAL ASSEMBLY
* CABLE IS SHOWN WITH SHIELD
ALREADY REMOVED FROM WHITE WIRE
PAGE 6
FIGURE 2: CONNECTOR WIRING
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