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COMMERCIAL CARBON DIOXIDE SENSOR, 400 PPM TO
2000 PPM (UP TO 5000 PPM EXTENDED RANGE),
5.0
CALIBRATION
With the ABC function on, the sensor readings, which may
have drifted due to mishandling during transportation and/
or installation, may gradually be recalibrated to the correct
numbers. However, in case the user cannot wait for several
cycles of ABC to run, the two quick manual calibrations given in
5.1 and 5.2 may be performed.
5.1
CAL_in Pin Calibration
Two CAL_in Pin calibration types are offered:
• bCAL (background calibration): Requires the sensor to be
exposed to fresh air (400 ppm CO
• CAL (zero calibration): Requires the sensor cell to be
completely immersed in a CO
A switch input is defined for the operator or master system
to select one of the two prepared calibration codes shown in
Table 5. It is recommended that the sensor be exposed to the
targeted gas atmosphere for at least 10 minutes to ensure the
CO
concentration inside the sensor chamber is stable at the
2
targeted value.
TABLE 5. DEFAULT SETTINGS OF BCAL_IN AND CAL_IN
INPUT
DEFAULT FUNCTION
available when closed for minimum 4 s,
bCAL_in
maximum 8 s; bCAL assuming 400 ppm CO
sensor exposure
available when closed for minimum 16 s;
CAL_in
CAL assuming 0 ppm CO
5.2
Modbus Calibration
Two Modbus calibration types are offered:
• Background calibration: Requires the sensor to be exposed
to fresh air (400 ppm CO
• Second point calibration: Requires the sensor to be exposed
to a certain atmosphere with a steady CO
other than 400 ppm, and that this CO
be informed via Modbus communication to the sensor.
For more details about the Modbus address and parameters
configuration for user calibration, refer to Section 8.0 Modbus
Function Description.
6 Sensing and Internet of Things
).
2
-free atmosphere.
2
sensor exposure
2
).
2
concentration
2
concentration should
2
CRIR E1
6.0
SELF-DIAGNOSTICS
The CRIR E1 has the following built-in, self-diagnostic
functions:
• A full system check that runs automatically every time the
power is turned on.
• The sensor probes are checked against failure constantly
during operation by checking the valid dynamic
measurement ranges.
• All flash updates, initiated by the sensor itself or by external
connections, are checked by subsequent memory read back
and data comparisons.
These system checks return error bytes to the system
RAM. The full error codes are available from the UART port
communication. The Out of Range error is reset automatically
after the CO
readings return to the normal measuring range.
2
The Memory error can be reset by power off/on. After the reset
of the Memory error, it is recommended to check the settings
stored in the memory to ensure they are the desired values.
7.0
MODBUS REGISTER DEFINITION
7.1
Input Registers Defineition (See Table 6.)
7.2
Holding Registers Definition (See Table 7.)
2
Issue 1
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