KMC Controls SAE-1062 - Manual (Page 5)

SAE-1011/1012/1062 Carbon Dioxide (CO
2
) Detectors 5 Installation Guide
Calibration
CO
2
Self-Calibration
NOTE: After power is first applied, the sensor
goes through a warm-up. Until warm-up is
complete, the sensor count will display 500
ppm.
These self-calibrating detectors use the sensor’s on-
board microprocessor to remember the lowest CO
2
concentration measured in a 24 hour period. The sen-
sor assumes this low point is at outside levels. (The
smart sensor discounts periodic elevated readings
that might occur if, for example, a space was used 24
hours per day over a few days.)
After collecting 14 days worth of low concentration
points, the sensor performs a statistical analysis com-
paring sensor readings to background levels. If there
have been any small changes that could be attribut-
able to sensor drift, a small correction factor is made
to the sensor calibration to adjust for this change.
Autocalibration corrects sensor drift to better than
±10 ppm per year.
If a space does not experience a periodic drop to
outside levels (e.g., where occupancy is 24 hours, 7
days/week), the self-calibration software should be
deactivated. If the software has been deactivated
(via menu buttons), calibration may be required
every two to three years.
NOTE: To comply with CA Title 24, Section
121(c), as well as sub-paragraph 4.F that
specifies accuracy will be maintained
within tolerance for a minimum of 5 years
without recalibration, autocalibration must
be ON and the sensor must be in a zone
that experiences periodic drops to outside
levels.
CO
2
Calibration with Gas
Calibration with gas requires a bottle of 1000 ppm
CO
2
gas, a tank pressure regulator with flow restric-
tor, and the necessary tubing to connect to the device
(obtained locally or from vendors such as instrumart.
com, testequipmentdepot.com, grainger.com, calibra-
tion-gas.com, and/or buycalgas.com).
NOTE: Because of the Automatic Calibration
Mode and other technology incorporated
into these detectors, only a single point
1000 ppm calibration is required to meet
specified accuracy.
NOTE: The detector must be operating normally
for at least five minutes before applying gas
to it.
1. Turn the regulator On/Off knob fully Off, attach
it to the 1000 ppm CO
2
gas bottle, and firmly
tighten it by hand.
CAUTION
Strong shock or vibration can affect calibration.
2. Remove the cover of the SAE-1011/1012/1062 to
expose the gas sensor chamber, gently remove
the cap from (only) one port on the chamber,
and connect the tubing from the regulator to that
port. (The tubing can be connected to either port.)
3. Ensure the device has been operating normally
for at least five minutes before applying gas, and
slowly turn the valve knob on the regulator to let
the gas begin flowing.
4. The regulator will restrict the flow rate to the
specified 100 ml/min. After a brief period the gas
will flow into the chamber and the CO
2
reading
on the LCD will begin to approach 1000 ppm.
Wait 1 to 2 minutes until the CO
2
reading stabi-
lizes.
5. Enter the Setup menu and use the MENU key to
advance to Calibrat 1000 PPM. Press and hold
the SAVE key for 2 seconds and the display will
change to Waiting Calibrat then to Waiting 5
minute to indicate that the process of reprogram-
ming the internal calibration setting is taking
place.
6. This calibration process takes about 5 minutes
and the LCD will count down the minutes. Do
not disturb the unit or the gas flow during this
period. When calibration is complete the unit will
display Calibrat Done. Press the SAVE key to
return to normal operation
7. Shut off the gas, disconnect the tubing, replace
the cap on the sensor chamber, and close the
cover.
Signal Output Calibration
Testing and calibration of output voltage/current is
available through the set-up and output test menus.
See the Set-Up section.