Detcon 1000_CO2 - Manual (Page 21)

Model 1000 CO2
Model 1000 CO2 Instruction Manual Rev. 2.2 Page 17 of 28
7.0 Programming Sensors
7.1 Alarm Levels
Both alarm 1 and alarm 2 levels are factory set prior to shipment. Alarm 1 is set at 20% of full-scale range;
alarm 2 at 40% of full-scale range. Both alarms can be set in 0.01% increments from 10 to 90% of full-scale
range. The following procedure is used to change alarm set points:
a) First, enter the programming menu by holding the programming magnet stationary over “PGM 2” for 30
seconds until the display reads “VIEW PROG STATUS”, and then withdraw the magnet. At this point,
you can scroll through the programming menu by momentarily waving the programming magnet over
“PGM 1” or “PGM 2”. The menu options are: View Program Status, Set Alarm 1 Level, Set Alarm 2
Level, and Set Cal Level.
b) ALARM 1 LEVEL: From the programming menu scroll to the alarm 1 level listing. The menu item
appears as: “SET ALARM 1 LEVEL”. Enter the menu by holding the programming magnet stationary
over “PGM 1” for 3 seconds until the display reads “SET ALM1 @ #.##%”, then withdraw the magnet.
Use the programming magnet to make adjustments using “PGM 1” to increase or “PGM 2” to decrease the
display reading until the reading is equal to the desired alarm set point. Exit to the programming menu by
holding the programming magnet over “PGM1” for 3 seconds, or automatically return to the programming
menu in 30 seconds.
c) ALARM 2 LEVEL: From the programming menu scroll to the alarm 2 level listing. The menu item
appears as: “SET ALARM 2 LEVEL”. Enter the menu by holding the programming magnet stationary
over “PGM 1” for 3 seconds until the display reads “SET ALM2 @ #.##%”, then withdraw the magnet.
Use the programming magnet to make adjustments using “PGM 1” to increase or “PGM 2” to decrease the
display reading until the reading is equal to the desired alarm set point. Exit to the programming menu by
holding the programming magnet over “PGM1” for 3 seconds, or automatically return to the programming
menu in 30 seconds.
d) Exit back to normal operations by holding the programming magnet over “PGM 2” for 3 seconds, or, the
sensor will automatically return to normal operation in 30 seconds.
7.2 Alarm Reset
An alarm condition will cause the applicable alarm to activate its corresponding relay and LED. If alarm 1,
alarm 2, or fault alarms have been programmed for latching relays, an alarm-reset function must be activated
to reset the alarms after an alarm condition has cleared. To reset the alarms, simply wave the programming
magnet over either “PGM 1” or “PGM 2”, momentarily, while in normal operations mode and note that the
corresponding alarm LED(s) turn off.
7.3 Other Alarm Functions
Alarms are factory programmed to be non-latching, de-energized; and to fire under ascending gas conditions.
The fault alarm relay is programmed as normally energized, which is useful for detecting a 24VDC power
source failure. All alarm functions are programmable via jumper tabs. Changing alarm functions requires the
sensor housing to be opened, thus declassification of the area is required.