Product Overview

FlexStat (General) 26 Application Guide, Rev S
4. Attach adapter
plate to back of
FlexStat
1–3. Turn cover
hex screws
CLOCKWISE
and remove
FlexStat from
backplate
5. Connect cable’s two pins
to the (lower right) power
(Com and ~) terminals
6–7. Connect adapter tube
to fitting and to tubing from
calibration gas cylinder
CO
2
Sensor Calibration
The BAC-13xxxx models do not have a calibration with gas option. They
use Automatic Background Logic, or ABC Logic
™
, a patented self-cali-
bration technique designed to be used in applications where concen-
trations will drop to outside ambient conditions (approximately 400
ppm) at least three times in a 14 day period, typically during unoccu-
pied periods. With ABC Logic enabled, the sensor will typically reach
its operational accuracy after 25 hours of continuous operation if it was
exposed to ambient reference levels of air at 400 ±10 ppm CO
2
. The sen-
sor will maintain accuracy specications with ABC Logic enabled, given
that it is at least four times in 21 days exposed to the reference value
and this reference value is the lowest concentration to which the sensor
is exposed. ABC Logic requires continuous operation of the sensor for
periods of at least 24 hours.
The BAC-14xxxx models have a calibration option for applying gas to
the sensor for maintaining maximum accuracy. The BAC-14xxxx has a
dual channel sensor (a CO
2
channel measures gas concentration, and a
reference channel measures the sensor signal intensity). Self-calibrations
are performed approximately every 24 hours using the reference chan-
nel. During the self-calibration the sensor PPM reading is frozen and
will not react to changing CO
2
.
If the unit has been eld-calibrated since leaving the factory, information
about the last calibration (date, elevation, and ppm of reference gas) will
be displayed in the lower part of the screen.
Calibration should be done in an area with stable space temperature.
There should be no signicant air drafts or temperature variations dur-
ing the calibration procedure.
NOTE: The HTO-1103 kit is for updating rmware and CO
2
calibration
of FlexStats (only). The HTO-1104 kit also includes cables for
updating rmware in all other KMC digital controllers as well.
To calibrate the BAC-14xxxx models, an HTO-1103 or HTO-1104 kit
and a GE Telaire 2075 (or equivalent) kit and gas are required:
1. Follow the instructions in the GE Telaire 2075 (or equivalent) calibra-
tion kit and gas, available locally or from vendors such as instrumart.
com, testequipmentdepot.com, grainger.com, calibration-gas.com,
Kit Tubing
Adapter
Calibration
Gas Cylinder
Cylinder Tubing
(Push Adapter
Inside the Tubing)
CO
2
Sensor Fittings
(Push Adapter Over
Either Fitting)