Kidde AirSense Stratos Micra 25 User manual

Installer’s Handbook
LM 80022 • Issue 16
High Sensitivity Smoke Detector
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Stratos-Micra • INSTALLER’S HANDBOOK • Iss. 16
Introduction 3
1. Indicators 4
2. Inside the Detector 5
3. Programming the Detector 7
4. Other remote software features 15
5. Design Limitations 20
6. Installation 24
7. Interfacing 29
8. Event Log 34
9. Commissioning 36
10. Maintenance 37
11. Troubleshooting 40
12. Do’s and Don’ts 42
13. Stratos-Micra 25 Specification 43
Reproduction of this document is strictly prohibited unless
written permission is obtained from Kidde Products Ltd.
Stratos, HSSD, Micra, ClassiFire and Stratos-Quadra
are registered trademarks of Kidde Products Ltd.
Stratos-Ex, FastLearn, PipeCAD, LDD and SenseNET are
trademarks of Kidde Products Ltd.
Copyright © 2011 Kidde Products Ltd.
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Stratos-Micra • INSTALLER’S HANDBOOK • Iss. 16
Stratos-Micra ® is a highly sophisticated ‘next generation‘ of High Sensitivity Aspirating
Smoke Detection product that has been designed to ensure that installation and
commissioning is as simple as possible, while optimising performance.
Stratos-Micra incorporates a patented ‘artificial intelligence‘ known as ClassiFire ®,
which allows the detector to configure itself to optimum sensitivity, alarm thresholds
and minimum nuisance alarms for any environment.
ClassiFire intelligence also monitors the detector chamber and dust separator
for contamination, continually adjusting the appropriate operating parameters to
counteract the negative effects of such contamination.
The Stratos range of detectors is unique in being able to provide a consistent level
of protection in a very wide range of environments by continuously making minor
adjustments to sensitivity.
The Stratos range of detectors has proven its worth many times by detecting ‘difficult-
to-detect‘ slow growth electrical overload incipient fires in ‘difficult‘ environments.
This handbook gives information likely to be needed for most installations, but for
more detailed information on subjects such as Fresh Air Referencing, please refer to the
complete Technical Manual or System Design Guide.
This equipment is Class 111 as defined in EN60950 (i.e., this equipment is designed
to operate from Safety Extra Low Voltages and does not generate any hazardous
voltages).
This label is located on the laser chamber and signifies that the unit is a Class 1 Laser
product as specified in IEC 60825-1. The unit incorporates a Class 3B embedded laser
which must not be removed from the detector as retinal damage may result if the laser
beam enters the eye.
If this equipment is part of a fire detection system, it should be supplied from an
approved power supply conforming to EN54-4.
This symbol appears on the main board of the unit and indicates that the board
contains static sensitive components. Suitable anti-static precautions must be taken
when handling the board.
This symbol indicates the Safety Earth stud (see section 6.2). This is for grounding cable
screens and should not be connected to 0V or signal earth.
Kidde Products Ltd. has taken every care to ensure that Stratos-Micra is as simple to install
as possible but in case of difficulty, please contact our Help Line to ensure trouble free
installation and operation.
Kidde Products Ltd. takes no responsibility for damage or injury occasioned as a result of
failing to install or operate the equipment in accordance with these instructions.
Introduction
HELP LINE
(+44) (0) 1844 265004
LASER CLASS 1
PRODUCT
0832
Kidde Products Limited
Unit 2 Blair Way Dawdon
City: Seaham, County Durham
SR7 7PP, UK
09
0832-CPD-0981
EN54-20: 2006
Aspirating smoke detectors
for fire detection and fire alarm
systems for buildings
Class A, B and C
Technical data: see INF48027 held
by the manufacturer
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Stratos-Micra • INSTALLER’S HANDBOOK • Iss. 16
1. Indicators
Fire indicator illuminates when the alarm level has been reached and the
appropriate time delays have expired.
Fault. Illuminates when the unit has a fault and a fault signal is being sent
to the fire alarm panel.
OK. Illuminates to show normal operation when there are no faults. The OK
lamp will flash during the 15 minute Fastlearn™ period when the detector
is first learning about its environment.
1
2
3
1
2
3
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Stratos-Micra • INSTALLER’S HANDBOOK • Iss. 16
2. Inside the
Detector
2
4
3
2
2.1 Interior view
1. Removable terminal blocks (see section 2.2)
2. Filter (see section 10)
3. Addressable bus interface card (APIC) port (see section 7.3)
4. Detector address DIP switch (see section 7.1)
5. RS232 serial port (see section 7.4)
1
5
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Stratos-Micra • INSTALLER’S HANDBOOK • Iss. 16
2.2 Detector
terminal block
connections
1
2
1. FAULT relay contacts (Open = FAULT) (see section 6.2.3)
2. FIRE relay contacts (Closed = FIRE) (see section 6.2.3)
3. APIC addressable bus connections for use in conjunction with interface card (see
sections 6.2.2 and 7.3)
4. RS485 / SenseNET connections (see sections 6.2.2 and 7.2)
5. Power supply connections (see section 6.2.1)
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Stratos-Micra • INSTALLER’S HANDBOOK • Iss. 16
3 Programming
the Detector
The following screen appears.
This window contains all the programmable functions for the Stratos-Micra.
To amend one of the programmable functions, go to the relevant tab in the “Function
settings” window, make the change and then click “OK”. This will save the change to
the detector’s internal firmware.
A list and explanation of the various functions is given overleaf, with the functions
grouped by the tab under which they appear.
The Stratos-Micra may be programmed from a PC when connected to the detector
via a standard 9-pin serial lead connected to the serial port of the computer and the
9 way socket at the base of the detector (see section 7.4, ‘Connecting to a PC’). In
order to do this, it is necessary to install the remote control software onto the compu-
ter. A copy of the remote control software is contained on a disk supplied with each
detector. Install the software in accordance with the on-screen instructions. To open
the software, select “Start ➔ Programs ➔ AirSense ➔ Remote x” (where x is the version
of software installed). Access the drop-down list to the right hand side of the toolbar.
This defaults to “Detector 001”. Scroll down this list to select the detector number
corresponding to the connected detector’s address number if the address is other then
the factory default setting of 1 (see section 7.1).
The programmable functions are all accessed though the “Options ➔ Detector set-
tings” submenu or by clicking on the detector symbol in the remote software toolbar
as indicated below.
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3.1 Time and date – Time and Date tab
It is important that the time and date be set up correctly on the controller’s internal
calendar/clock because it uses this information to store events in the event log. See
section 8, “Event log” for more details. Unless specially ordered, units are supplied with
the correct setting for UK time. This is backed up with a rechargeable battery. Later
adjustments to the clock setting should not exceed ± 70 minutes unless a FastLearn is
initiated
3.2 Alarm levels - Alarm levels and delays tab, Level subgroup
The value set in the Fire, Pre-Alarm and Aux functions in the Level subgroup is
the relatively scaled bargraph level at which the appropriate alarm is initiated on the
detector. The Fire 2 level assigns an absolutely scaled alarm level in % obs/m.
The Aux level is set by factory default at level 10 which means that this alarm will occur
after the Fire alarm. The default level settings for Pre-Alarm and Fire 1 are 6 and 8
respectively. The default setting for Fire 2 is 20% obs/m.
3.3 Alarm delays - Alarm levels and delays tab, Delay subgroup
The alarm delay is the number of seconds that an alarm level has to be continuously
sensed before the alarm is initiated. Each alarm level has a programmable delay of
between 0 and 90 seconds. The default delay for each alarm level is 5 seconds.
3.4 ClassiFire®override - Alarm levels and delays tab
Note: This function is only available via the optional Input/Relay Card. This board is fitted
in the same manner as an APIC card (see section 7.3). Only a single expansion port is avail-
able, so an APIC card cannot be fitted at the same time as an Input/Relay card.
This function is used to temporarily decrease the sensitivity of the detector by a known
amount to prevent nuisance alarms generated by planned events, e.g., opening fur-
nace doors or incense burning during church services.
When this function is set to a value other than zero, the shorting together of the "I/P
3" contacts on the Input/Relay Card by means of volt free contacts will desensitise
the detector by moving the alarm levels out by the specified percentage: e.g., if the
ClassiFire Override level is set to 15 and the normal Fire 1 alarm is at 20%, closing the
contacts will change the Fire 1 threshold to 35%.
NB, unlike other remote functions employing the Input/Relay card, a choice of
input terminals is not available. This function is dedicated to the “I/P 3” termi-
nals.
3.5 Alarm factor - Alarm levels and delays tab
The detector sensitivity is set with this entry, which will also affect the probability of
nuisance alarms. 0 = high sensitivity, higher probability, 8 = low sensitivity, lower prob-
ability. The default alarm factor is 4.
Note: The highest sensitivity setting is suitable for clean, environmentally controlled envi-
ronments, e.g. semiconductor manufacturing clean rooms where airborne pollutants are
kept to an absolute minimum and the least contamination is cause for alarm.
Use of this setting in a busy machine shop would lead to relatively frequent nuisance alarms
due to the normal variation of atmospheric contamination and a lower sensitivity setting is
recommended. It is therefore important that the alarm factor chosen is suitable for the
area to be protected. When the appropriate alarm factor for the protected area has been
set, nuisance alarms will be reduced to an absolute minimum.
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The following table gives suggested settings of ClassiFire alarm setting for different locations
0 Extremely High Once per year Semiconductor manufacturing clean room
1 Once per 5 years Computer room
2 Once per 10 years Non-smoking office
3 Once per 50 years Clean factory
4 Medium Once per 1000 years Warehouse
5 Medium Once per 5,000 years Warehouse with diesel trucks operating
6 Medium Once per 10,000 years Warehouse with diesel trucks operating
7 Low Once per 20,000 years Warehouse with diesel trucks operating
8 Low Once per 100,000 years Warehouse with diesel trucks operating
Alarm
Factor Sensitivity Probability of Nuisance Alarm Suggested Protected Area
3.6 LDD Enable - Alarm levels and delays tab
When this function is ticked, Laser Dust Discrimination (LDD™) increases the response
time of the detector slightly, whilst greatly reducing the likelihood of nuisance alarms
due to dust ingress. LDD may be disabled in very clean rooms for a slightly faster
response to smoke by setting this function to unticking the box. This function is ena-
bled by default. NB: Disabling LDD is not recommended for areas other than manufac-
turing clean rooms, due to the increased probability of nuisance alarms in most other
operating environments.
3.7 FastLearn enable - Alarm levels and delays tab
If the detector is in FastLearn mode, unticking this box will stop the FastLearn process.
Using the function in this way is neither recommended nor supported by Kidde
Products Ltd.
Ticking the box will start a FastLearn at any time. The green “OK” LED on the front of
the detector will flash for the fifteen minutes that it takes for the FastLearn process, and
will then change to constant illumination to indicate that the FastLearn is complete.
Note: It will take a further 24 hours after the FastLearn for full sensitivity to be reached,
unless Demonstration Mode has been initiated (See section 3.10, “Demo mode”). It is
essential for proper functioning that the detector not be left in Demonstration mode, and
that it be allowed to complete the 24-hour learning period. To cancel demo mode, tick this
box or power down and restart the detector to initiate FastLearn mode.
3.8 Auto FastLearn enable - Alarm levels and delays tab
When enabled, this function will cause the detector to reset its flow thresholds and
start a new FastLearn sequence whenever the power is cycled (turned off and then on
again). Since the FastLearn process results in reduced sensitivity for 24 hours, there
are times when it may be desirable to disable this function, ensuring that the detector
retains all its settings when the power is cycled.
It should be noted that when the function is enabled and the power is cycled, it will
“learn” the following situations, setting them as nominal:
• Blocked or broken sampling pipes
• Blocked or missing dust separator
• Missing front cover (this will result in flow faults when the cover is fitted)
The function is enabled by default
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3.9 ClassiFire 3D - Alarm levels and delays tab
If this function is ticked, then the detector will ignore any pre-set time delays in the
event of a rapid increase in smoke density, thereby minimising response time to 'rapid
growth' fires. This function would normally only be used where there were long time
delays programmed on the alarm levels. This function is disabled by default.
3.10 Demo mode - Alarm levels and delays tab
Demonstration mode is an operating mode whereby the normal 24-hour learning
period is bypassed, so that the detector can reach high sensitivity after only the 15
minute FastLearn period. This can be used so that initial smoke testing and other com-
missioning can be carried out.
However, it must be understood that, since the alarm levels will be based solely
upon the sparse data gathered during the FastLearn period, there is a risk of nui-
sance alarms due to normal variations in ambient smoke levels. For this reason,
the detector should not be left in Demo mode for normal use when connected to
a fire panel.
3.11 Day start / Night start – Day/Night switching tab
These values are the times to the nearest hour at which the day/night switching is
desired to take place on the detector. Entries are made in 24-hour format, e.g. 19 for
7pm. Day and night switching is intended so that the detector may automatically select
a different sensitivity when the protected area is unoccupied and fewer contaminants
are being produced. ClassiFire automatically detects the change in smoke level after the
protected area is left, and if the time at which this happens is within + 70 minutes of
the programmed switchover time it selects the night-time histogram. This means that
changes in time setting, e.g. changing to summer time, may be ignored as the detec-
tor will take this into account. The default times for day and night start are 08:00 and
19:00 respectively
Note that if the environment actually becomes more contaminated during the
night period for any reason then ClassiFire will adapt to that too, reducing the
night-time sensitivity.
3.12 Disable Day / Night switching – Day/Night switching tab
If day/night switching is not desirable, the Disable day/night switching box
may be ticked to leave the detector permanently in day mode.
3.13 Remote Isolate - Alarm actions tab, Remote input subgroup
This function prevents the detector or Command Module from sending alarm notifica-
tions to the connected fire panel when the relevant activating terminals are shorted
together via volt-free contacts. It may be used during detector maintenance or smoke
testing.
When the function is enabled, entering a value of 01, 02 or 03 to the numeric field to
the left of the tick-box assigns the “I/P 1”, “I/P 2” or “I/P 3” terminals of a connected
relay/input card respectively as the activating terminals.
Remote terminals 4 and 5 are retained for future expansion.
When a unit is isolated, the FAULT light will be illuminated on the detector and a fault
signal will be sent to the fire panel, Command Module or SenseNET™.
Note: This function is only available via the optional Input/Relay Card. This board
is fitted in the same manner as an APIC card (see section 7.3). Only a single expan-
sion port is available, so an APIC card cannot be fitted at the same time as an
Input/Relay card.
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3.14 Remote Reset – Alarm actions tab, Remote input subgroup
This function allows latching alarms or faults (see sections 3.17 and 3.18) to be
remotely reset when the relevant activating terminals are shorted together by volt-free
contacts.
When the function is enabled, entering a value of 01, 02 or 03 to the numeric field to
the left of the tick-box assigns the “I/P 1”, “I/P 2” or “I/P 3” terminals of a connected
relay/input card respectively as the activating terminals.
Remote terminals 4 and 5 are retained for future expansion.
Note: This function is only available via the optional Input/Relay Card. This board
is fitted in the same manner as an APIC card (see section 7.3). Only a single
expansion port is available, so an APIC card cannot be fitted at the same time as
an Input/Relay card.
3.15 Remote Day/Night – Alarm actions tab, Remote input
subgroup
This function allows the detector to be manually toggled between day and night opera-
tion (see section 3.3.6) when the relevant activating terminals are shorted together. It
is useful where the protected area is occupied at varying times, allowing the last person
to leave the area to activate the switch.
When the function is enabled, entering a value of 0 1, 02 or 03 to the numeric field to
the left of the tick-box assigns the “I/P 1”, “I/P 2” or “I/P 3” terminals of a connected
relay/input card respectively as the activating terminals.
Remote terminals 4 and 5 are retained for future expansion.
The day/night setting reverts to the previous state when the contacts are opened. The
function can be activated by a keyswitch, latching push button or any other device that
has volt-free short circuit contacts when activated. NB, enabling the function overrides
any day / night switch-over times previously set (see section 3.11).
Note: This function is only available via the optional Input/Relay Card. This board
is fitted in the same manner as an APIC card (see section 7.3). Only a single
expansion port is available, so an APIC card cannot be fitted at the same time as
an Input/Relay card.
3.16 Programmed Isolate – Alarm actions tab
When this function is ticked the detector will not generate alarms on any fire panel
which is connected, e.g. for use during detector maintenance. The “Fault” light will be
illuminated on the detector front panel. The isolated condition will be disabled auto-
matically after 7 days if not manually disabled. This function is disabled by default.
3.17 Latching alarms – Alarm actions tab
When this function box is ticked it requires a reset signal to clear an alarm condition.
Reset can be remote (see section 3.14), from the Remote Software (see section 4.1) or
from a Command Module.
If unticked, the alarm signal is extinguished as soon as the alarm condition ends. This
is the factory default setting.
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3.18 Latching faults – Alarm actions tab
When this function box is ticked it requires a reset signal to clear a fault condition.
Reset can be remote (see section 3.14), from the Remote Software (see section 4.1) or
from a Command Module.
If unticked, the fault signal is extinguished as soon as the fault condition ends. This is
the factory default setting.
3.19 Cascading alarms – Alarm actions tab
Ticking this function box means that only when the detector has gone into Pre-Alarm
does it start counting down the main Fire delay i.e. the time delays on Pre-Alarm and
Fire 1 are cumulative. The Aux alarm is not included in the cumulative delay since it
may be set to a higher level than either the Pre-Alarm or Fire 1 levels. This function is
enabled by default.
3.20 Device type – Device information tab
This function is for display purposes only. It shows any special designation for the unit,
which will normally be Stratos-Micra.
3.21 Firmware version – Device information tab
This function is for display purposes only. It shows the version number of the fitted
firmware chip.
3.22 Run-time hours – Device information tab
This function is for display purposes only. It shows the cumulative total number of
hours that the device has run (NB: this is not the time that has elapsed since last power-
up, but the sum total of run time since the detector memory was last reset).
3.23 Watchdog count – Device information tab
The watchdog is a circuit built into the detector that restarts the detector in the event
of a failure to function properly. This could be as a result of electrical spikes. This count
shows the number of interruptions found. The details of each problem can be found
in the event log. See section 8, “Event log” for further details.
3.24 Device text – Device information tab
This function can be used to enter a special designation for the units, such as its work-
ing area or room number, which will be displayed on a connected Command Module
or SenseNET™ system in place of the detector's address number, whenever the detec-
tor generates an event such as an alarm or fault. The maximum length (including
spaces) is 16 characters.
3.25 Reference detector – Referencing tab
A Micra detector may use another detector as a fresh air reference. This function is the
address of the detector which will be used as the reference.
To set a detector as a reference detector, enter its address as set by its internal DIP
switch into this function. This function is disabled by default.
3.26 Reference enable – Referencing tab
Ticking this box enables the reference for the detector, if one has previously been
allocated in Reference detector (see section 3.25) This function is disabled by
default.
NB +
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3.27 Reference level – Referencing tab
The value set with this function is the percentage reference signal subtracted from the
detector’s signal, if a reference device has been allocated. The default value is 0.
3.28 Reference back-off – Referencing tab
This value is the delay time between a build up of pollution being seen by the reference
(if used) and the pollution being seen by the detector. The default value is 15.
3.29 Flow rate – Flow monitoring tab
This function is for display purposes only, and shows a value corresponding to the cur-
rent airflow through the detector.
3.30 Flow high limit – Flow monitoring tab
This value is the level above which airflow needs to increase to trigger a fault indication
(which may indicate a loose or damaged inlet pipe).
Flow low limit and Flow high limit parameters are automatically set up on
initial power-up at the end of FastLearn. They can be manually adjusted after that if
required.
3.31 Flow low limit – Flow monitoring tab
This value is the level below which airflow needs to be reduced to trigger a fault read-
ing (which may indicate a blocked pipe).
Flow low limit and Flow high limit parameters are automatically set up on
initial power-up at the end of FastLearn. They can be manually adjusted after that if
required.
3.32 Flow fault delay – Flow monitoring tab
This feature requires the Remote Control Software version 3.2 or later, available to
download free on www.airsensetechnology.com
The default flow fault thresholds on the Stratos-Micra are set to meet the stringent
airflow monitoring requirements of EN54-20, with a default flow fault delay of 30 sec-
onds. This may lead to unwanted flow faults being generated when local conditions
cause short-term variations in airflow. To help alleviate such issues, the flow fault delay
is programmable from 30 to 240 seconds. The flow level needs to be above the high
flow threshold or below the low flow threshold throughout the delay period for a fault
to be generated.
NB: When setting the value of this function, it is important to take into account
that the control unit (e.g. fire panel) may not react immediately to a trouble sig-
nal being generated by the detector, and this will add to the total fault response
time of the system.
The function value must be chosen so that the total time between the detector
entering a fault condition and a fault signal being generated by the panel meets
the requirements of local or national fire regulations. The maximum allowable
response time for EN54-20 compliance is 300 seconds, and that for NFPA 72 com-
pliance is 200 seconds.
As an example: in the latter case, if the flow fault delay were set to 180 seconds
(within the limit), but the fire panel did not generate a fault indication for another
25 seconds, the total response time of 205 seconds means the system would not
comply with the regulations.
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setting type storage interval time per division
on chart log
0 Detector output 1 second 10 seconds
1 Detector output 5 seconds 50 seconds
2 Detector output 12 seconds 2 minutes
3 Detector output 30 seconds 5 minutes
4 Detector output 1 minute 10 minutes
5 Detector output 2 minutes 20 minutes
6 Detector output 5 minutes 50 minutes
7 Detector output 10 minutes 100 minutes
8 Detector output 20 minutes 200 minutes
9 Detector output 50 minutes 500 minutes
10 flow recording 1 second 10 seconds
11 flow recording 5 seconds 50 seconds
12 flow recording 12 seconds 2 minutes
13 flow recording 30 seconds 5 minutes
14 flow recording 1 minute 10 minutes
15 flow recording 2 minutes 20 minutes
16 flow recording 5 minutes 50 minutes
17 flow recording 10 minutes 100 minutes
18 flow recording 20 minutes 200 minutes
19 flow recording 50 minutes 500 minutes
The chart log recording rates are as follows.
In the above table the grayed section indicates flow rate recording while the white sec-
tion indicates detector and alarm level recording.
At the slowest recording rate, one month of data can be recorded. The factory default
setting is 8.
If documented figures are unavailable for the fire panel reaction time, compliance
with reaction time regulations may only be verified by post-installation testing.
3.33 Access code – Miscellaneous tab
This is the access code required to amend programmable parameters. The default code
is 0102. Once the appropriate code is entered it may be changed here to any four digit
number to limit unauthorised access.
3.34 Chart recording rate – Miscellaneous tab
This function controls how frequently the detector and alarm level or flow rates are
stored in the Stratos-Micra 100’s internal chart recorder log. (See section 4.3, ‘Chart
recording’).
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4. Other remote
software features
4.1 Reset
If latching alarms (see section 3.15) or latching faults (see section 3.16) are enabled,
the relevant alarm or fault warnings will remain on the detector front panel LEDs and
controlling unit until a reset is performed. If using SenseNET software, individual detec-
tors can be reset (refer to the SenseNET User Guide for details). In the remote software,
a global reset is available which resets all detectors on the SenseNET loop, or a single
stand-alone detector.
To perform a reset, either select the menu options “Options ‘ Global Reset” or click
the symbol indicated below.
3.35 Separator condition – Miscellaneous tab
The value given at this function is the efficiency rating of the dust separator element in
the detector as a percentage of the efficiency of a clean separator. A new element will
give a reading of 99 in this function. When the efficiency has decreased to 80%, the
Fault indicator LED will illuminate and the event log will show “Separator renew”.
Note - After fitting a new element, it will be necessary to start a FastLearn to reset the
separator condition reading (see section 3.7).
3.36 Separator change date – Miscellaneous tab
This function defaults to “--“, which means that a separator fault will only appear
when the efficiency decreases to 80% (see 3.35, “Separator condition”). However, a
date may be entered into this function to allow for a scheduled maintenance period.
The detector will then generate a separator fault at the planned time regardless of the
condition of the separator, although degradation of the separator to below 80% effi-
ciency before this date will override this.
See section 10, “Maintenance” for further details.
3.37 Factory default – Miscellaneous tab
Enabling this function will reset each programmable function to the default value indi-
cated in the text, where a default setting is specified. It will also put the detector into
FastLearn mode, regardless of whether or not Auto Fastlearn is enabled (see section
3.8). This ensures that the flow setups and alarm thresholds are optimised to the detec-
tor’s working environment after resetting. It should be noted that where a ClassiFire
alarm factor other than the default is required for the protected area, this will need to
be re-entered. Section 3.5 gives details of the ClassiFire alarm factors.
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4.2 Histogram screen
The histogram screen shows various aspects of the detector function. To enter the
histogram screen, either select the menu options “View ‘ Histogram viewer…” or click
the symbol indicated below.
The following screen appears:
Smoke density
histogram
Alarm flags
There are two types of smoke density histogram; one shown in blue (the “fast” histo-
gram) which updates every 15 minutes, feeding information to the long-term “slow”
histograms (which appear in yellow). These set the detector sensitivity based on the
ambient smoke conditions and it takes 24 hours for the two slow histograms (the
“day” and the “night” histograms) to complete their learning phase (see section 3.7).
Detector sensitivity is based on the fast histogram during FastLearn and is thereafter
based on the currently active slow histogram. However, although the positions of the
alarm flags are based on the slow histogram, sudden changes in smoke density are
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picked up by the fast histogram so that early warning is given.
Sensitivity: The current absolute sensitivity of the detector in percentage obscura-
tion per metre (% obs/m)
Mean: The current mean value of smoke density, taken from the currently “active”
histogram and given as a percentage of full scale deflection.
Variance: The “spread” of data in the currently “active” histogram and given as a
percentage of full scale deflection.
FastLearn: If the detector is currently in FastLearn mode, this will show the number
of minutes remaining in the FastLearn period. When this period has elapsed it will read
“OFF”.
Alarm factor: This is the ClassiFire alarm factor (see section 3.5, “Alarm factor”)
Day/night: This indicates the currently active slow histogram
Alarm levels: These figures give the position of the various alarm flags in terms of a
percentage of full scale deflection.
Detector output: This shows the real-time variation in background smoke levels in
terms of a percentage of full scale deflection.
4.3 Chart recording
The chart recording function shows how smoke density in the protected area has var-
ied over time. The chart may be downloaded to disk or printed out from a connected
printer.
To access the chart log, select the menu options “View ‘ Chart recording…” or click
the symbol indicated below.
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The red trace is the current alarm level and the black trace is the detector output. By
moving the cursor along the chart, the “Chart information” window (shown at the
bottom left) updates to show the date and time, detector level and alarm level of the
relevant period. The ‘File’ menu option in the chart recording window allows the chart
recording to be saved to disk or printed to a connected printer, and allows a previously
saved chart recording to be loaded. Chart recording files have the extension “.rcw”.
Where a custom set of programmable function settings is commonly used, these may
conveniently be saved to or loaded from disk. To open a detector function settings (.dfs)
file, select the menu options “File ‘ Open” or click on the symbol indicated below.
4.4 Load / save function settings
The following screen appears:
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Click on the “List files of type” drop-down box and select “Detector settings (*.dfs)”
as indicated below.
A list will appear of all detector settings files stored on the current drive. As a special
case, if desiring to recall the factory default settings, there is a file named ‘default.
dfs’ in the ‘remote2k’ directory. Loading this file will reset the detector to the factory
default.
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5. Design
Limitations
Stratos-Micra is intended to provide LOCALISED incipient fire detection only. This
means that it is suitable for the substantial range of applications typified by; small
non-compartmentalised rooms, warehouse racking, or pieces of electronic or
electromechanical equipment where it is desirable to achieve individual incipient
fire reporting. In compartmentalised rooms, each compartment would normally use
individual Stratos-Micra detectors.
This product employs a very low-power aspirator and the aspirating capability of the
Stratos-Micra detector is limited accordingly. Stratos-Micra is NOT intended to protect
large areas, or to sample from areas where there may be any difference in airflow
rates or pressure differentials. Application of Stratos-Micra in these circumstances is
not recommended. If detection in environments conforming to these descriptions is
required, alternative versions of Stratos products should be used.
Maximum recommended sampling pipe length is 50 metres in STILL AIR. In areas or
applications where the external airflow rate is greater than 1 metre per second, the
maximum sampling pipe length is reduced to 10 metres.
Although by no means essential, it must be recommended that if in doubt, PipeCAD®
be used to ensure that transit times, balance of suction and individual sampling point
sensitivity are within desired limits.
In order for the installation to conform to EN54-20, pipes must conform at least to
EN61386-1 Class 1131.
Sampling pipes must have capped ends. The end cap should be drilled with a hole
normally between 4 or 5mm diameter and free from burrs. Sampling holes should
normally be 3-4mm diameter or as calculated by PipeCAD, and free from burrs. Each
pipe run should not have more than 10 holes (including the end cap hole). Pipe transit
time from the furthest sampling hole from the detector must not exceed 120 seconds
and an approved type of pipe must be used for installations conforming to LPCB
requirements. It is strongly recommended that the smoke transit time from the furthest
sampling hole be checked during commissioning tests.
Capillary Remote Sampling Points may be used in place of sampling holes.
Stratos-Micra is available with an optional ‘Piped Exhaust’ type Docking Station (see
illustration A). This is primarily intended to allow the Stratos-Micra detector to sample
from areas which may be at different air pressure to the detector location. Typical uses
are for air-duct sampling and allowing the installation of the detector in under-floor or
ceiling voids or when sampling from pieces of computer related equipment.
IMPORTANT
!
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