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C7110C1001A, C7110D1009A WALL MODULES – PRODUCT DATA
"3000" ppm
Fig. 6. Jumper set to 3000 ppm
When the configuration jumper is set to position "3000" ppm
(see Fig. 6), the CO
measuring range will be expanded to
2
400...3000 ppm.
Quick Calibration Methods
In the event that one cannot wait for ABC to gradually correct
measurement errors, it is possible to make use of either one
of the following two quick calibration methods:
▪
Zero Calibration or
▪
Fast Background Calibration (recommended method).
These quick calibration methods typically takes about 2
minutes.
IMPORTANT
Do not change the position of the configuration
jumper before first removing power.
After initiating the desired calibration process by removing
power and then repositioning the jumper, restore power and
then wait until the calibration process has been completed
(see "Behavior of Service LED during Quick Calibration")
before again removing power, returning the jumper to the
desired range setting (i.e., "2000" or "3000"), and finally
restoring power.
Zero Calibration ("CAL0")
Fig. 7. Jumper set to CAL0
When the configuration jumper is set to position "CAL0" (see
Fig. 7), Zero Calibration will be carried out. This is done while
testing the wall module with CO
atmosphere or air purged of CO
EN0B-0735GE51 R0317
-free air (e.g., a pure nitrogen
2
using Milk of Lime).
2
Fast Background Calibration ("CAL400")
Fig. 8. Jumper set to CAL400
When the configuration jumper is set to position "CAL400"
(see Fig. 8), 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
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 (Automatic Baseline Correction) – 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. 9. Default setting (ABC ON = ext. 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
4
2
2
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