C7110C1040 AND C7110C1080 WALL MODULES – PRODUCT DATA
EN0B-0775GE51 R0619
4
Zero Calibration ("CAL0")
Fig. 6. Jumper set to CAL0
When the configuration jumper is set to position "CAL0" (see
Fig. 6), Zero Calibration will be carried out. This is done while
testing the wall module with CO
2
-free air (e.g., a pure nitrogen
atmosphere or air purged of CO
2
using Milk of Lime).
Fast Background Calibration ("CAL400")
Fig. 7. Jumper set to CAL400
When the configuration jumper is set to position "CAL400"
(see Fig. 7), Fast Background Calibration will be carried out.
The current level is then set to 400 ppm (= normal expected
actual fresh air level) in a single step.
NOTE:
Before starting Fast Background Calibration,
ventilate the room with fresh outdoor air.
Behavior of Service LED during Quick Calibration
During Zero Calibration or Fast Background Calibration, the
Service LED will indicate that the given calibration process is
in progress by flashing once per second for 90 sec (sensor
warm-up) and then twice per second for 10 sec (sensor cali-
bration). Once the calibration process has been completed,
however, the Service LED will then stop flashing and return to
normal operational behavior.
NOTE:
One possible reason for a failed calibration is if CO
2
levels fluctuate too wildly during calibration; in this
event, you should remove and then restore power to
the device and perform the calibration again.
ABC
During
ABC
(
A
utomatic
B
aseline
C
orrection) – which is
ON
by default – any initial (due, e.g., to rough handling during
shipping) or subsequent long-term drift will be gradually
corrected (i.e., by a max. of 50 ppm per week). This is done
by comparing the lowest measured value (over the last 7.5
days) with the expected fresh air level (400 ppm).
When the configuration jumper is set to the factory default
position of "2000" ppm or to "3000" ppm, the wall module will
operate normally and perform ABC.
Fig. 8. Default setting (ABC
ON
= adjacent LED flashes
GREEN for first 10 s after power restoration)
NOTE:
In buildings featuring plastered walls / ceilings or
other constructional materials containing quicklime –
especially when fresh – unusually low levels of CO
2
(i.e., far below 400 ppm) may prevail, especially in
new, poorly ventilated areas. To prevent sensor mal-
functions in such situations, it is recommended that
ABC be switched
OFF
.
Switching ABC OFF and ON
IMPORTANT
Do not change the position of the configuration
jumper before first removing power.
ABC
OFF
ABC
ON
Fig. 9. Switching ABC
OFF
(left) or
ON
(right)
ABC can be switched
OFF
by repositioning the jumper as
indicated in the left-hand side of Fig. 9. The adjacent LED will
then flash YELLOW briefly and then remain lit YELLOW. This
indicates that ABC has finished switching
OFF
.
NOTE:
If ABC is switched
OFF
, we recommend that you
then calibrate the sensor using Zero Calibration or
Background Calibration at least once per year to
ensure that the CO
2
level readings remain within
specifications.
ABC can be switched
ON
by repositioning the jumper as
indicated in the right-hand side of Fig. 9. The adjacent LED
will then flash GREEN for the first 10 sec and then remain lit
GREEN. This indicates that ABC has finished switching
ON
.
NOTE:
Only after ABC has finished switching
ON
or
OFF
should you again remove power, return the jumper to
the desired range setting (i.e., "2000" or "3000"), and
finally restore power. The given ABC setting (
ON
or
OFF
) will then remain in effect even if power is
subsequently removed or restored.