caron 7310-22, Operation Manual

Page: 85 / 131

7310 Series Operations Manual REV E 11-19-19 Page 85 of 131
A positive value will move the CO
2
‘up’ and a negative value ‘down’. Press the ‘home’
button and verify the proper CO
2
is displayed. (See Temperature Calibration Example.)
Calibrating Lights
If light calibration is needed, perform either Method C or Method D.
The chamber uses a high-quality PAR calibrated light sensor for light detection.
Be sure the reference instrument’s light sensor is a traceable PAR (Photosynthetically
Active Radiation) sensor in units of µmole/m
2
/s.
Method C (geometric center)
Place the chamber’s light sensor (which is attached to the light sensor bracket) on the
rear duct sheet approximately 6 inches from the lamps and centered left-to-right.
Locate the reference instrument’s light sensor in the shelf center and at a distance of 8
inches from the lamps. Turn the lights ‘
on ’ and let the unit stabilize for at least 15
minutes at 20C. Adjust the light calibration so the chamber light intensity reading
matches the reference light sensor.
.
Method D (chamber sensor)
Place the chamber’s light sensor (which is attached to the light sensor bracket) on the
rear duct sheet approximately 4 inches from the lamps and centered left-to-right. Locate
the reference instrument’s light sensor adjacent the chamber’s light sensor. Turn the
lights ‘
on ’ and let the unit stabilize for at least 15 minutes at 20C. Adjust the light
calibration so the chamber light intensity reading matches the reference light sensor.
When calibrating the sensor under colored
lights, do not calibrate to far-red light only.
For models with colored lights, the recommended
calibration method is to calibrate the sensor under
the colored light ratios and intensity as intended