Model IR4000S
19
4.2 Gas Checking the IR400
You can ‘gas check’ an IR400 unit to verify response without tripping relays. During gas
check mode, the Alarm and Warn relays are disabled.
CAUTION
– The analog output from the IR4000S is directly connected to the IR400
being used and this analog output will indicate gas present when the IR4000S is in Gas
Check Mode. Make sure that any equipment monitoring the analog output is in alarm
bypass mode before performing a gas check.
To Gas Check the IR400 Unit:
4.2.1
Open the main menu. Place the magnet on the IR4000S GM logo to access the
main menu options.
4.2.2 Select Gas Check. Once the Gas Check (- - -) option appears, remove the
magnet. The % LEL display will flash. Apply gas. After gas is removed, the
IR4000S will return to normal operation and display % LEL.
4.3 Zeroing the IR400
You can ‘zero’ the IR400 detector in order to eliminate any background gas fluctuations,
using the
ZrO
option. During zeroing mode, the analog output for the IR400 is kept at
1.5 mA and the Alarm and Warn relays are disabled.
To Zero the IR400 Unit:
1.
Open the main menu.
Place the magnet on the IR4000S GM logo to access the
main menu options.
2.
Select zeroing.
Once the
ZrO
option appears, remove the magnet.
AC
(Automatic
Calibration) will flash for 20 seconds. When zeroing is complete, the display shows
zero complete by displaying
0C
for 10 seconds. The IR4000S will then return to
normal operation and display % LEL.
NOTE:
Reapplying the magnet during the
ZrO
option will return the unit to normal
operation. Reapplying the magnet while
0C
is displayed will start the calibration
cycle.
