14
Addressable gas sensors
Use
ENGINEER’S
menu 10 (addressable zero span) to calibrate the addressable sensors. The
inhibit LED on all connected sensors will flash. Use the
UP (1)
and
DOWN (5)
buttons to look
at all sensor addresses which are being zeroed and use the
+ (4)
or
– (2)
buttons to zero the
reading on each sensor.
Press the
SELECT (3)
button to enter the span mode which gives plenty of time to
visit each sensor. Gas each sensor with appropriate calibration span gas and return to the
panel.
Use the
UP (1)
and
DOWN (5)
buttons to view each sensor address and using the
+ (4)
or
–
(2)
buttons, adjust the peak sensor reading to be that of the calibration gas. Press
SELECT (3)
to exit this menu when all sensors have been adjusted.
Note:
peak readings are lost when exiting from this menu. Re-enter the menu and use again to
calibrate any missed sensors.
Cell replacement on sensors
Should a sensor cell require to be replaced, the sensor should have its power removed before
changing the cell itself. Flammable (Catalytic) and Toxic cells have colour coded wiring which
is Pink, Yellow and White which should be connected correctly according to the markings on
the PCB. Data sheets C893, C894 & C323 at the end of this document detail the procedure for
setting up a new sensor independent of the panel and then when connected, follow the above
zero and span procedure.
SETTING ALARM LEVELS
The high and low alarm points for the sensors can be set manually using
ENGINEER’S
menu
15 for addressable alarm levels.
Menu 15 for addressable sensors
Use
UP (1)
and
DOWN (5)
, to choose a sensor which requires an alarm change.
Use
+ (4)
and
– (2)
to adjust the low alarm point.
Pressing
SELECT (3
) will then request you to set the High alarm point.
Pressing
SELECT (3)
again allows the Over Range alarm to be set.
Use the
RESET
button
(7)
to select RISING and FALLING alarm.
Pressing
SELECT (3)
again will exit the menu and save the parameters to memory.
