29
.Set 4-20mA loop..
O2 20.9%
..Set 4mA zero…
O2 20.9%
255
O2 20.9%
...Set 4mA zero…..
O2 20.9%
5.5 Entering the Menus
The
Dual O2/CO2
monitor is supplied with main menus with sub menus to adjust mA outputs,
alarm relay settings, sensor adjustments and zero suppression for toxic and corrosive gas
sensor cells.
NOTE: The
Dual O2/CO2
monitor can only output one analog mA signal. You
must select either O2 or CO2. See the section Set 4-20mA loop source.
5.5.1 Set 4-20 mA Loop
This main menu will permit the adjusting of the 4mA and 20mA output from the
Dual
O2/CO2
monitor for only one gas; oxygen or carbon dioxide. Once you select the gas
this menu will provide the function that will send an actual output between 4mA and 20
mA to test any remote control and alarm system attached to the Dual O
2
/CO
2
monitor.
NOTE: To read the mA output, Dual O2/CO2 monitor must either be connected to a
remote PLC controller or SCADA system. You can also connect the Dual O2/CO2
monitor to a DC ammeter to read the mA output. Please consult CONCOA for more
information.
From this main menu, pushing the joystick to the right will select the sub menu and the
digital display will scroll the following:
This is the menu at which to adjust the 4mA output being sent from the Dual O2/CO2
monitor.
To change this value, push the joystick right to display the 4 mA setting. The display will
indicate a value between 0 and 255 counts. Pushing the joystick up increases the value
and pushing the joystick down decreases the value. The 4mA output being sent from the
Dual O2/CO2 monitor will change as the number on the digital display changes.
Push the joystick to the left to enter the value and bring you back to the pervious main
menu. The digital display will scroll the following: