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Honeywell's 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
compensating for sensor drift.
Table 3 shows the ABC period specifications. Please refer to Modbus Function Description section for
setting the ABC period.
CHARACTERISTIC
ABC Periods
1 ABC periods can be configured per the user's requirements. The available range is 4 hours to 4800 hours, and it must
be an integer multiple of 4.
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 4 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 6 hours of operation, the first four hours of operation
is counted as the completion of one 4 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
4 hour interval, the CRIR E1 must be powered on and operate continuously for another 4 hours.
NOTICE
Exposing the CRIR E1 to CO
the ABC algorithm and shall be avoided when the ABC function is ON. For how to switch the ABC
function on/off, refer to Modbus Function Description section.
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Honeywell CRIR-E1 User Guide
AUTOMATIC BASELINE CORRECTION (ABC)
Table 3 - ABC Period Specification
1
concentrations below 400 ppm may result in incorrect operation of
2
, the expected CO
2
2
PARAMETER
4 hours to 4800 hours (default is 180 hours)
concentration in fresh air, thus
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