17
Figure 16. How to change the CO
2
set point
The set point regulation page will appear as in the Figure 16(b). You can modify the set point by clicking
on + and
–
. Once you have input the new CO
2
set point, press
Set
to save or
Cancel
to undo.
Tip
►
After any change in the set point value the controller enters into a transient regime, the Status
Indicator and the Top LED turn yellow (see paragraph 9.1.2). During the transient regime, the controller will
not trigger on alarm.
9.1.2
Controller Status: colours led and meaning
The C02 UNIT BL can assume four different status, which are represented by the colors assumed by the
Status Indicator (pointer 1 in Figure 15) and by the TOP LED (if enabled, as indicated in paragraph 9.2.2.3):
The GREEN color indicates that the set-point value has been reached (within the
tolerance defined in the alarm subpage, see paragraph 9.2.2.5) and that the system is working
properly.
Controller Status: NORMAL
The YELLOW color indicates that the controller is in transient regime. The Yellow light
will appear after the controller is turned on and after any set point chance. The system is working
properly, it is not in alarm and no action is needed. As soon as the CO2 UNIT BL reaches the CO
2
composition, the CO2 Controller Status changes to NORMAL and the color turn GREEN. If the CO2
UNIT BL cannot reach the set composition values within the maximum time defined by the
operator (see paragraph 9.2.2.5), the Gas Controller Status changes to ALARM and the color turn
ORANGE.
Controller Status: TRANSIENT
The ORANGE color indicates that that the current gas concentration is not correct and its
value is out of the set tolerance (
see section “ALARMS” in paragraph
9.2.2.5). Most commonly this
is related to gas leaks or gas source(s) running low. Verify that all cables are correctly connected.
Check all tubing for gas leaks and pressure in gas supply tanks.
Controller Status: ALARM
The RED color indicates that there is a problem with the unit itself (for example the
sensor is broken). The system is on alarm. Turn the system off, wait for 5 minutes, and turn it
back on. If the color is still red, contact Okolab at www.oko-lab.com for support.
Controller Status: ALARM