MSA DF-8500 - Page 49

DF-8500 Gas Detector
(2) Press “ON” and the screen will display the menu for entering password.
(3) Enter the password (see Section 4.4).
(4) If you enter the correct password, you will enter the next submenu,
and the
countdown starts from 900 second (total 15 minutes), it means there wil
l be no alarm
when you replace the sensor during this time, the sensor service time will be cleared
when pressing “ON” again, and return to the
concentration measurement screen
after the countdown is interrupted; press “OFF” to interrupt the countdown, and
return to menu M-05 with clearing the sensor service time.
(5) Press “OFF” to return to the previous menu M-05.
Note: For ethylene oxide (ETO), chloroethylene (VCM) and
Methanol
Sensor, their warm-up time is quite long, so excessive alarm will
be
appeared 24 hours after changing the sensor, which is a
normal
condition.
[M-06] -- LED testing
LED testing. All segments of the nixie tube display and the LED flickers.
(1) Press “+” to select menu item M-06.
(2) Press “ON” , and then the screen flickers to display “OFF” .
(3) Press “+” , and then all the segments of the nixie tube with the LED diodes are
lighted.
(4) Press “OFF” to exit menu item M-06.
[M-07] -- Loop testing
This menu can be used to conduct (4~20) mA loop testing.
(1) Press “+” to select menu item M-07.
(2)
Press “ON” and the screen will display 04, which means that the initial current is 4
mA.
(3) Press “ON” again, and 04 starts to flicker. This means that the device has enter
loop testing mode, and the output current of the loop is 4 mA.
(4) Press “+” or “-” to change data. At this time, both the flicker value and the output
current will also change.
(5) Press “OFF” to exit the loop testing status and return to upper menu M-07.
[M-09] -- Sensor information display
This menu is used to display information related to the sensor, through which the
sensor working status can be determined preliminarily.
(1) Press “+” to select the menu item M-09.
(2)
Press “ON” and the scroll display will show “parameter name = parameter value.”
Press “+” or “-” to select the parameter you want to see
(TEMP=..., CURRENT=...,
S+=...).
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