Det-Tronics Optical Integrity with X-Series Flame Detectors
All Det-Tronics X-Series flame detectors are equipped with Optical Integrity (oi), a feature
developed and patented by Det-Tronics. This Technical Bulletin provides an overview of this
capability.
The following information applies to the entire line of Det-Tronics X-Series flame detectors, which
consist of the following:
• X3301 and X3302 Multispectrum IR Detectors
• X2200 UV Detectors
• X9800 IR Detectors
• X5200 UVIR Detectors
The full line of Det-Tronics X-Series flame detectors are third party approved self-testing
devices and do not require a test torch for operational testing of window cleanliness or alarm
operation.
Det-Tronics X-Series flame detectors use calibrated optical test signals that are evaluated to
factory set values for verification that greater than 50% of the detection range remains.
The factory default setting for X-Series flame detectors is one oi test on each sensor per minute,
with a fault generated after 3 consecutive oi test failures. A fault is also generated if undersensitivity or over-sensitivity of a sensor is detected.
The full line of Det-Tronics X-Series flame detectors are performance approved by Factory
Mutual. Det-Tronics X-Series flame detectors comply with the Automatic Fire Alarm Signaling
Performance standards and are verified per Factory Mutual Approval Standard FM 3260. The
following is an excerpt from the FM standard:
Section 3.6.2 the product literature shall specify a device or a readily reproducible technique for
checking the response of an installed detector. The device or technique shall be evaluated during
the examination of the detector for reliability, accuracy of calibration, and if applicable, suitability
for hazardous location use.
Section 3.6.3 the response test shall be equivalent or proportional to the radiant emissions from
the test sources (flames or embers) used to establish the sensitivity of the detector during the
course of the examination. The response test shall not employ a radiator of either unknown
emittance or uncontrolled distance (i.e. a flash light or test lamp).
Det-Tronics X-Series flame detectors meet the above standard. The Optical Integrity test provides
fast identification of ALL possible fault conditions leaving NO UNDISCLOSED FAILURE MODES.
There are instances when site engineers wish to prove the detectors using a manual test method.
The manual oi test performs the same calibrated test as the automatic Optical Integrity test and
will generate a fire alarm condition when greater than 50% of the detection range remains.
The following options are available for performing a manual oi test with X2200, X5200, X9800,
X3301 and X3302 flame detectors:
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Option 1
Hold a test magnet for at least ten seconds at the MAG oi location on the side of the detector.
This will immediately initiate the manual oi test. If greater than 50% of the detection capability
remains, the detector will go into alarm mode, the output will be activated, and the LED will
change from green to red.
Option 2
Connect the manual oi line through a PLC or addressable module, or simply hardwire a switch to
activate the test by taking terminal 22 to zero voltage (terminal 1). Result: If greater than 50% of
the detection capability remains, the detector will go into alarm mode, the output will be activated,
and the LED will change from green to red.
Option 3
If using an Eagle Quantum Premier LON version of the flame detector, using S3 software, access
the appropriate “Point Display” screen. The Point Display can be accessed from either the Point
Display button on the Command Bar or from the Online Mode. The Point Display provides a
single window view of all available real-time data for the device. A “Manual oi” button is included
within the Point Display. When this button is selected, the operator can choose between an Active
or Passive oi test.
• An Active oi test will activate all applicable alarm circuitry, including deluge, horns,
beacons, and any other outputs programmed within the EQP logic.
• When a Passive oi test is selected, the detector will be fully tested, however, no outputs
will be activated.
The bottom left quadrant of the Point Display shows the manual Optical Integrity test log for the
detector. The last eight manual tests are shown with the date, time, and a PASS/FAIL indicator.
Settings for the Optical Integrity test are selectable through the detector programming software.
The frequency of tests can be adjusted, as well as the number of consecutive failures required
before a fault condition is signaled. This is especially useful where certain environmental
conditions cause Optical Integrity fault conditions to occur even though the hardware is not faulty.
Detector Electronics only recommends Optical Integrity modification when detectors are subject
to extensive levels of rain or blizzard-like snow conditions. Consult the factory for assistance in
this regard.
How Optical Integrity Works
The light from the microprocessor controlled internal oi source lamps passes through the
sapphire filter and contacts the oi reflector for each sensor. The oi reflector reflects the test light
back through the sapphire filter and into each corresponding sensor. The sensors then respond
accordingly, passing a signal back to the microprocessor where it is analyzed. If 50% or greater
sensitivity remains, the oi test is deemed successful.
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Dramatization of the X3302 Oi Signal
Corresponding Sensor Signals on
Oscilloscope
The photo below is a dramatization of an X3301 with one sensor that has intentionally been
optically obscured. The oi test now indicates no response from the obstructed sensor. This
condition will result in a yellow fault LED and an
Automatic or Manual oi test failure.
X3302 with One Sensor Obscured
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Sensor Signals on Oscilloscope with
One Sensor obscured
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