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COMMERCIAL CARBON DIOXIDE SENSOR, 400 PPM TO
2000 PPM (UP TO 5000 PPM EXTENDED RANGE),
2.0
SENSOR HANDLING
CAUTION
IMPROPER SENSOR HANDLING
• The CRIR E1 is an electrostatic-sensitive device (ESD).
Handle the CRIR E1 using appropriate ESD methods such
as electrostatic dissipative gloves, wrist straps, etc.
• Handle the CRIR E1 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 E1's optical
chamber,
• Ensure that the CRIR E1 is not subject to drops and
vibration.
Failure to comply with these instructions may result in
product damage.
FIGURE 1. CRIR E1 APPEARANCE
Optical chamber (silver)
CAUTION
EXPOSURE TO HARMFUL GASES
Ensure that the CRIR E1 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 E1'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 E1
3.0
AUTOMATIC BASELINE CORRECTION (ABC)
The CRIR E1'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 E1,
however, does not necessarily need to operate continuously for
n hours to activate the ABC function. The CRIR E1 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 E1 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 is 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 E1 must be powered on and operate continuously for
another four hours.
NOTICE
Exposing the CRIR E1 to CO
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 E1.
Issue 1
000841
concentrations below 400 ppm
2
Sensing and Internet of Things
, the
2
3
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