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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
atmosphere.
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 CO2 concentration inside the sensor chamber is
stable at the targeted value.
INPUT
bCAL_in
CAL_in
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
concentration other than 400 ppm, and that this CO
2
informed via Modbus communication to the sensor.
For more details about the Modbus address and parameters configuration for user calibration,
refer to the Modbus Function Description section.
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 he 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
to the normal measuring range. 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.
Tel: 07788 548013
solentgasconsultants@gmail.com
Honeywell CRIR-E1 User Guide
Table 5 - Default Settings of
Available when closed for minimum 4 s, maximum 8 s; bCAL as-
suming 400 ppm CO2 sensor exposure
Available when closed for minimum 16 s; CAL assuming 0 ppm
CO2 sensor exposure
SELF-DIAGNOSTICS
BCAL_IN and CAL_IN
DEFAULT FUNCTION
2
free
2
).
2
concentration should be
readings return
2
).
2
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