22
When you have selected the correct character, press
Continue
, the cursor will move to the next character
position.
Note: The next character will start from the last one
selected.
If you are editing a current text string, press Continue
to accept a character you wish to keep.
To delete characters press the Back
button, all
characters will be deleted to the right of the cursor.
If a text string is deleted in error, double- click the Back
button to exit the menu item. The original text
string will be retained.
Continue entering the rest of the text string. To finish
press the Continue
button once more.
3.8 In the event of an alarm
In the event of an alarm the message display area
will display the channel in alarm and the detectors
location (if this information has been pre-set in the
configuration), the Alarm LED will flash, the internal
sounder and any dedicated audible visual alarms will
activate, and any external alarm apparatus connected
through the channel relays will operate. If more then
one channel goes into alarm, the display will cycle
through the channels in alarm. Channel display area
in the Figure 3.3 shows channel #2=CH4 (methane) in
alarm condition.
The gas reading will cycle back and forth between the
channel type and the gas reading.
Gas detectors
The channel or channels in alarm will display an alarm
symbol and flash alternately with the type of the
detector in the channel display. Gasmaster provides low
and high alarm levels, these levels are user configurable
and can be set as rising or falling.
Fire detectors
Fire detectors in alarm will display FIRE in the channel
display. There is only one level of alarm for fire channels.
Environmental sampling Units (ESU)
ESU sampling devices that have slowed or stopped will
display ESU. Level 1 means slow, level 2 means stopped
To mute the sounder
Press the Accept/Reset
button on the operator
panel (or remote Accept/Reset switch if fitted). The
Alarm LED will stop flashing, but remain lit. The channel
display will show the gas reading.
When alarm conditions have cleared, press the Accept/
Reset
button to clear any latched alarms.
3.9 mV channels: Pellistor saver mode
In order to protect pellistor-type sensors from damage
when exposed to high gas concentrations, flammable
gas detectors connected to a mV pellistor input module
are protected by a ‘Pellistor Saver’ mode. If the signal
from the sensor exceeds 95%LEL the system removes
power from the sensor. The channel will go into fault
and the display will read “Chan #n: pellistor saver
mode”, followed by a latched alarm message. This state
latches for 200 seconds, after which it may be manually
reset: power is restored to the sensor and the pre-set
stabilization period is reapplied to allow the sensor to
settle. It is advisable to check that no flammable gas
remains in the area of the detector before re-setting.
Whilst in pellistor saver mode the channel display will
display ‘det’ and ‘or’ in sequence to indicate the sensor
has been exposed to an excessive gas concentration.
A horizontal bar sequences top, middle, bottom while
the 200 second timer is active, and the centre bar only
flashes when the timer is complete and the channel is
ready to be reset.
Note: it is strongly recommended that sensors are re-
balanced and re-calibrated after exposure to high gas
concentrations.
3. Operation
Summary of Contents for Gasmaster
Page 12: ...9 2 Installation ...
Page 28: ...25 Menu system overview ...
