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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 M1 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
readings return to the normal measuring range. The Memory error can be reset by
2
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-M1 User Guide
Table 5 - Default Settings of
Available when closed for minimum 4 s / maximum 8 s; bCAL
assuming 400 ppm CO
Available when closed for minimum 16 s; CAL assuming 0 ppm
CO
sensor exposure
2
SELF-DIAGNOSTICS
BCAL_IN and CAL_IN
DEFAULT FUNCTION
sensor exposure
2
2
).
2
concentration should be
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