Co Sensor Calibration - KMC Controls FlexStat BACnet Operation Manual

CO Sensor Calibration
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The BAC-13xxxx models (with T6613 model sensors)
do not have a calibration with gas option. It uses
Automatic Background Logic, or ABC Logic
ented self-calibration technique designed to be used
in applications where concentrations will drop to
outside ambient conditions (approximately 400
ppm) at least three times in a 14 day period, typi-
cally during unoccupied periods. With ABC Logic
enabled, the sensor will typically reach its operation-
al accuracy after 25 hours of continuous operation
if it was exposed to ambient reference levels of air
at 400 ±10 ppm CO . The sensor will maintain ac-
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curacy specifications 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 (with T6615 model sen-
sors) have a calibration option for applying gas
to the sensor for maintaining maximum accuracy.
The BAC-14xxxx has a dual channel sensor (a CO
channel measures gas concentration, and a reference
channel measures the sensor signal intensity). Self-
calibrations are performed approximately every 24
hours using the reference channel. During the self-
calibration the sensor PPM reading is frozen and will
not react to changing CO
If the unit has been field-calibrated since leaving the
factory, information about the last calibration (date,
elevation, and ppm of reference gas) will be dis-
played in the lower part of the screen.
To calibrate the BAC-14xxxx models:
1. Follow the instructions in the GE Telaire 2075 (or
equivalent) calibration kit and gas, available lo-
cally or from vendors such as instrumart.com, tes-
tequipmentdepot.com, grainger.com, calibration-
gas.com, and/or buycalgas.com) for attaching a
regulator and tube to a cylinder of reference gas.
2. On the FlexStat, turn the hex screws in the bot-
tom and top clockwise until they clear the cover.
3. Carefully pull the cover away from the backplate
(mounting base).
4. Attach the adapter plate (with attached power
cable) for the CO
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FlexStat Firmware Flash Upgrade Kit to the back
of the cover.
5. Remove the protective rubber cap from the power
adaptor cable's two pins and insert the pins into
FlexStat
™
.
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FlexStat from the HTO-1103
the 24 VAC power section (Com and ~ on lower
right) of the wall-mounted terminal blocks. (Keep
the cap on the pins when not in use.)
6. Remove the protective caps from both of the cali-
, a pat-
bration tubes on the back of the FlexStat board.
NOTE: Although the caps are not required for
maintaining the accuracy of the sensor,
they protect against insects, dust, or other
contaminants from getting inside the tubes.
If a cap is lost, the sensor will still function
normally, but the cap should still be
replaced as soon as possible.
7. Connect the tube from the reference gas to either
of the calibration tubes.
8. Select the Advanced > CO
menu.
9. Enter the elevation and ppm of the reference gas
used.
10. Open the cylinder's regulator to allow gas
through the sensor.
11. Change Mode from Monitor to Calibrate and
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push Enter. The Calibration Time will begin
counting at the bottom of the screen.
NOTE: After initiating, the calibration process
takes approximately 4 minutes and cannot
be stopped by any button presses until
the cycle is complete. If power is removed
before the calibration process is completed,
the old values will be retained.
NOTE: No matter what the normal inactivity time-
out setting is, time-out for the calibration
screen is 10 minutes. See System Setup on
page
12. After the calibration process is complete, Mode
will change from Calibrate to Monitor. Press the
Left button and information about the most recent
calibration (date, elevation, and ppm of reference
gas) will be displayed in the lower part of the
screen.
13. Turn off the gas, remove the connected tubing,
and reinsert the protective caps in the calibration
tubes.
14. Carefully remove the adapter plate and power
cable and reinstall the FlexStat on its backplate
while being careful not to pinch or dislodge any
wiring.
15. Back the hex screws (counterclockwise) out of the
brackets until they engage the FlexStat cover and
hold it in place.
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Sensor > Calibration
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23.
Operation Guide, Rev. L