Detcon 240 - Manual (Page 16)

240 Operators Manual
Model 240 Operator Manual Rev. 1.8 Page 12 of 29
6.4 Main Display Functions
The Main Display is a 1”x 5” backlit LCD that has 2 lines by 24 characters. In normal operation “CH # =
XX ppm GAS” will be displayed. If any channel is in any gas alarm condition, the “CH#” will change to
“ALM”. If any gas channels are in Fault, they will display “CH # = IN FAULT”. If any channels are in
CAL MODE, they will display as “CH # = IN CAL”. If any channels are not communicating with sensors
set up as serial input sensors, then they will display “CH # = NO COMM”.
NOTE: The LCD has a backlight that will automatically turn off after 30 seconds of inactivity. The LCD
backlight will come on automatically as soon as any function key is pressed. This is a feature designed to
save on power.
6.5 User-Interface Menu Functions
The User-Interface is conducted via the Model 240-N4X Front Plate shown above in Figure 8. The Menu
Flow Chart (Figure 9) is navigated using the function keys described in Figure 8. User-Interface menu
activity is conducted via the 1”x5” LCD and the four function keys. Four LED indicators on the front
panel show alarm and fault relay status. The LED’s represent ALM 1 (green), ALM 2 (amber), ALM 3
(red) and FAULT (blue). There are 13 Main Menu entries and their functional descriptions are discussed
below.