[M-00] -- Alarm(relay)reset
This menu item is used to reset the LOC or alarm of the combustible sensor. This
menu item will be displayed only when the LOC or the relay is set as locked.
(1) Press “+” to select the menu item M-00.
(2) Press “ON” , and the menu of entering password appears.
(3) Enter the password (see Section 4.4).
(4) If the password is correct and the current alarm condition doesn’ t exist, then the
locked alarm is reset.
If the DF-8500 gas detector is exposed to a high gas concentration
environment (over 100%LEL), the relay of the device will enter the locking
state, User needs to pay special attention to the presence of high
concentration combustible gas in the environment that may exceeds the
safe range. Corresponding measures should be taken immediately to
ensure that the concentration is reduced to the safe range as soon as
possible to avoid safety accidents.
[M-01] -- Zero calibration
(1) Press “+” to select the menu item M-01.
(2) The display displays zero countdown time after pressing “ON” , with a default
value of 30 seconds.
(3) Apply zero gas (Pure Nitrogen or atmosphere without the gas being measured).
(4) Start countdown after pressing “ON” again.
(5) After finishing countdown, the screen flickers to display the current concentration
that is measured.
(6) After zero calibration is finished, the screen flickers to display “OK” 3 times.
(7) Return to the measurement mode.
Note: Please make sure the detector has been powered on for at
least one hour before attempting a zero calibration.
[M-02] -- Gain calibration
(1) Press “+” to select the menu item M-02.
(2) The screen displays span countdown time after pressing “ON” , with a default
value of 30 seconds.
(3) Apply testing gas.
(4) Start countdown after pressing “ON” again.
(5) After finishing countdown, the screen flickers to display the current concentration
that is detected.
(6) After gain calibration is finished, the screen flickers to display “OK” 3 times and
start the subsequent down count.
(7) You can stop or continue applying testing gas during the countdown process.
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