Crowcon Crowcon Gasmaster, Installation, Operation And Maintenance Manual, Page: 20 / 48

Installation Crowcon Gasmaster
16
Calibrate Wizard. Ensure the channels are
inhibited prior to applying gas.
5. The next wizard screen displays the
default calibration gas concentration as
50% of range. If necessary this calibra-
tion figure must be adjusted to match the
concentration of the calibration gas used.
Adjust the value using the
Up and
Down buttons as necessary and press
Continue .
6. When "Apply Gas" is displayed, apply
gas to the detector and press Continue
, allow readings to settle.
7. Press
Continue
when the reading on
the appropriate channel is stable, and
the detector has been calibrated accord-
ing to its instructions.
Gasmaster will display
‘Pass’
when
successful or
‘Fail’
if the detector
signal is out of range.
8. Calibration is complete when
‘Purge’
is displayed, remove the gas from the
detector.
Use the Continue button to calibrate
another channel or Back
button to
exit
Supervisor mode and return to the
main display.
9. Ensure that all channel inhibits are
removed after calibration is complete.
2.12.3. Testing fire channels
To test smoke detectors, inhibit the relevant FIRE
channel and use a smoke test aerosol to test each
detector on a loop in turn. The channel display
will indicate FirE when the detector activates.
Each detector on a loop should be reset before
testing the next to ensure that all detectors acti-
vate the alarm.
Heat detectors can be tested with a heat-gun
using the same method as described above.
Flame detectors can either provide a signal
using contacts, or a 4-20 mA signal.
A contact type detector will be connected as a
conventional fire loop using 470
Ω
series resis-
tors and a 1K8 end of line resistor and will only
indicate FIRE or FAULT. A 4-20 mA detector will be
connected directly as a 4-20 input, and may have
various alarm levels to indicate UV or IR activation
(please refer to the instructions supplied with the
device for details). Flame detectors require a UV or
IR torch (depending on detector type) to simulate
alarms. Inhibit the relevant channel, shine the torch
at the detector and check that FirE is shown on
the Gasmaster display. For 4-20 mA detectors, also
check that the appropriate alarm level is displayed.
2.12.4. Testing ESU channels
To test a channel monitoring an ESU sampling
device, inhibit the channel and manually slow
the device, check that Alarm Level 1 is activated.
Manually stop the device and check that Alarm
Level 2 is activated. If the alarms do not activate
the thresholds may need changing, refer to section
3.10 for details on how to change alarm levels.
When commissioning is complete ensure
that the system is left fully functional
with no faults present and no channels
inhibited.