-
２８
-
⑨
Backup power source
device inspection
(Equipment with a backup
power source device
only.)
・
Cut off the power supply and check that the alarm and indicator unit normally
operates for at least 30 minutes. Battery voltage indicated on the backup
power source unit should be 23V or more after 30 minutes of operation.
・
If the equipment’s operation stops within 30 minutes, the battery needs to be
replaced with a new one. (The equipment has a function to prevent over
discharge. It automatically stops before over discharge happens.)
・
Battery’s life span is three years. Check that it has not expired.
8-3 Preparation of Calibration Gas – When isobutene 0.72vol%(40%LEL)
(1) If you have a standard gas cylinder
Fill a gas bag with standard gas as shown in Fig.17 Completely
vacuum the air from the bag before filling the gas because the
air in the bag may cause an error of the gas concentration.
(2) If you do not have a standard gas cylinder
Make 0.72vol% (40%LEL) calibration gas by diluting pure gas
(isobutane 99%) with the air using the calibration equipment kit.
Replace an expired battery or it may not work in case of a power
failure.
CAUTION
The calibration gas can be used to check the alarm function.
Check the concentration using Gas Detector XP-311 or a
similar device before using the gas for calibration of the
indicator.
MEMO
Fig. 17 Taking Standard Gas
Make sure that there are no flammables nearby when handling flammable gas with a concentration over LEL
(lower explosive limit).
DANGER
0.72%vol
isobutane
air balance
gas bag
