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COMMERCIAL CARBON DIOXIDE SENSOR, 400 PPM TO
2000 PPM (UP TO 10000 PPM EXTENDED RANGE),
2.0
SENSOR HANDLING
CAUTION
IMPROPER SENSOR HANDLING
• The CRIR M1 is an electrostatic-sensitive device (ESD).
Handle the CRIR M1 using appropriate ESD methods such
as electrostatic dissipative gloves, wrist straps, etc.
• Handle the CRIR M1 by the black PCB on the edges as
shown in Figure 1.
• Ensure that the gas diffusion area shown in Figure 1 is not
blocked or contaminated.
• Ensure that force is not applied to the CRIR M1's optical
chamber.
• Ensure that the CRIR M1 is not subject to drops and
vibration.
Failure to comply with these instructions may result in
product damage.
FIGURE 1. CRIR M1 APPEARANCE
Optical chamber (silver)
CAUTION
EXPOSURE TO HARMFUL GASES
Ensure that the CRIR M1 does not come into contact with the
following harmful gases:
• Acidic: Includes HCl, HF, H
• Basic: Includes NH
, PH
3
• Strong oxidizing: Includes Cl
Failure to comply with these instructions may result in
product damage.
NOTICE
To extend the CRIR M1's lifetime, ensure that it does not come
into contact with salt spray, oil mist, soot, and high humidity.
PCB (black)
PTFE membrane (white) allows
gas to diffuse in the sensor
S, SO
, NOx, etc.
2
2
, N
H
, etc.
3
2
4
, F
, O
, H
O
, etc.
2
2
3
2
2
CRIR M1
3.0
AUTOMATIC BASELINE CORRECTION (ABC)
The CRIR M1's built-in, self-correcting ABC algorithm allows
maintenance-free operation in normal indoor environments.
This algorithm automatically calibrates the sensor's lowest
reading over a preconfigured time interval to 400 ppm CO
expected CO
concentration in fresh air, thus compensating for
2
sensor drift.
Table 3 shows the ABC period specifications. Please refer to
Section 8.0 Modbus Function Description for setting the ABC
period.
TABLE 3. ABC PERIOD SPECIFICATION
CHARACTERISTIC
PARAMETER
ABC periods
4 hr to 4800 hr (default is 180 hr)
1
ABC periods can be configured per the user's requirements. The
1
available range is four hr to 4800 hr, and it must be the integer multiple
of four.
One ABC period (n hours) requires the completion of n/4
intervals of four hours of operation per interval. The CRIR M1,
however, does not necessarily need to operate continuously for
n hours to activate the ABC function. The CRIR M1 counts the
number (m) of completion of four hour intervals. If m reaches
n/4, the ABC function is activated. For each four hour interval,
however, the CRIR M1 must operate continuously, otherwise its
contribution to m is not counted.
For example, if the sensor powers off after six hours of
operation, the first four hours of operation are counted as
the completion of one four hour interval, which is added to m
and stored in the sensor memory. The remaining two hours
of operation, however, do not count because the four hour
requirement is not met. Therefore, they are not recorded after
the power off. To complete the next four hour interval, the
CRIR M1 must be powered on and operate continuously for
another four hours.
NOTICE
Exposing the CRIR M1 to CO
ppm may result in incorrect operation of the ABC algorithm
and shall be avoided when the ABC function is ON. For how
to switch the ABC function on/off, refer to Section 8 Modbus
Function Description.
4.0
TERMINATION
Table 4 specifies the pins and I/O options dedicated to the
CRIR M1.
Issue 1
000842
concentrations below 400
2
Sensing and Internet of Things
, the
2
3
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