Innovate Motorsports ST-12 - Manual (Page 6)

6
3.2 Connecting the LC-1ST to the ST-12 and Calibration
Note: The calibration process can be done with multiple LC-1STs
at one time
Connect the DB-15 connector from the LC-1ST to the ST-12.
1 Do not connect the sensor to the LC-1ST yet.
2 Switch ON the power supply on the ST-12. You should see the following
screen in LogWorks:
3 Switch off the power supply after 10 seconds.
4 Connect the sensor to the sensor interface connector on the LC-1ST. The
sensor must be exposed to free air (outside of the exhaust) for the
first time calibration.
5
Switch ON the power supply on the ST-12. After the sensor is warmed
up, the LC-1ST automatically calibrates the sensor heater controller to
the particular sensor. During this 20-second period the LC-1ST collects
and calculates sensor specific data required to quickly reach operating temperature in the future.
During the heater calibration the screen will show a “Htr Cal” count down
from 9 to 0.
6 Press the Calibration button for the LC-1ST
on the front of the ST-12. The
LC-1ST will now calibrate itself by using air as a reference gas with
known oxygen content. After the calibration period is over (2-3 seconds),
the instrument is ready to operate.
In general, it’s only necessary to calibrate the sensor heater the first time you
use a new sensor, while the free air calibration is required more frequently.
Free air calibration will correct for: 1) A change in atmospheric pressure (i.e.
going from sea level to 6,000 ft. above for a race); or 2) Sensor wear (i.e.
regular use for hundreds of hours).
Heater calibration detects and stores the impedance characteristics of a new sensor. Generally these
characteristics don’t change with wear, however some forms of carbonization can impact the impedance
of the sensor. The most common problematic carbonization comes from the use of leaded gas. If you see
an error #4 (Pump cell circuit open) after using the sensor with leaded gas, you probably need to perform
a heater recalibration. If you use sensor regularly with race gas, we recommend keeping a backup
sensor, and performing heater recalibrations more frequently.