OM0135
36
9.3 Setting Air Injections
If there is still some undesired condensation in the chamber when the door and perimeter heaters are set for
the desired result, the air injections can be adjusted. There is a control for length of the air injection
labeled, Air Inject Time, and the frequency that air is injected called, Air Inject Cycle. These controls are
described in more detail in the "Opt" menu. The default is 35-second injections every 10 minutes. Start by
increasing the length of the injection by a few seconds at a time then increase the frequency if needed.
9.4 CO
2
Calibration
The DHD Autoflow infrared CO
2
sensor may be calibrated using one of three techniques: CO
2
control,
CO
2
sensor and CO
2
injection calibration. The CO
2
control and CO
2
injection calibration procedure are
easily performed on the front panel similar to the temperature offset requiring no tools. The CO
2
sensor
internal procedure is more in depth requiring approximately 15 minutes to perform.
9.4.1 CO
2
Control Calibration
CO
2
Control Calibration can be performed anytime an independent measurement doesn't correlate
to the front panel display. However, this calibration SHOULD NOT BE PERFORMED MORE
THAN ONCE PER WEEK. Sensor calibration should be performed if an independent
measurement doesn't match the display within +
0.3 percent within one week after a sensor
calibration. Before doing the following calibration, check and change, if necessary, the Incubator
in-line filter found within the control center.
When unit has stabilized at the operational temperature and CO
2
percentage, take an independent
measurement and, if necessary, perform the following:
In run mode press "SEL" to indicate LED next to CO
2
percent display.
Press and hold ▲ key, CO
2
display alternates between “ADJ” and the CO
2
percentage.
Press both ▲ and ▼ keys simultaneously, (clears all previous offsets).
Use an independent instrument to determine actual CO
2
percentage (compare the display CO
2
to the independent measurement). If these two readings have a difference of less than 1.0
percent, proceed to enter the CO
2
Fyrite value. (See * Note below) If the difference is greater
than 1.0 percent, proceed to CO
2
sensor zero/span calibration.
Press ▲ or ▼ key to indicate same CO
2
percentage as the independent measurement.
Press "SEL" to set current value and exit calibration.
*Note: When the display value is more that 0.3% different from the measured value, offset
display 1/2 the difference measured. Allow the Incubator to stabilize back to set point, then
measure the CO
2
in the chamber again. Offset the display again if necessary.
To Next Page
Loading...
Need help?
General
