49
on the Petri dish, and insert it in the incubation chamber. You can also use SENSOR LID-
# to close the dish (see the “Tip” in 12).
Note
►
Please, monitor the room temperature during the calibration and reduce air drafts
and forced convection. If possible divert any draft coming from the air conditioning system
from the incubation system.
5.
Wait until the system reaches the steady state (temperature indicator status is green)
then approach the oil immersion objective to the bottom of the Petri dish. The Fine
Gauge Thermocouple will detect a decrease in temperature because of the contact with
the cold lens. You can see the Fine Gauge Thermocouple temperature decreasing in the
Main page (see paragraph Main Page and Main Menu Navigation13.3)
6.
When the Fine Gauge Thermocouple reads a stable temperature open the ‘Objective
Heater Submenu’ as shown in Figure 27 and select the ‘Offset' item (See Figure 30) .
Next click on “+” or “-” on the ‘Offset’ to adjust the Objective Heater offset value.
Okolab recommends starting with an offset value corresponding to the difference
between the set point temperature and the actual temperature measured by the Fine
Gauge Thermocouple. Press ‘Enter’ and wait until the temperature measured by the Fine
Gauge Thermocouple is stable. If the temperature measured by the Fine Gauge
Thermocouple is now close to the set point, then the Manual Calibration is complete. If
the temperature measured by the Fine Gauge Thermocouple is far from the set point,
repeat the steps above until the temperature measured by the Fine Gauge
Thermocouple reaches the set point temperature.
15
Flow meter regulation
Do not use the flow meters as closing-opening valves. Once regulated the flow rate
(at P=1bar), use the flow meters carefully only for fine regulations
Open the gas valves about 15 minutes before inserting the specimen in the Micro
Environmental Chamber. Please, follow carefully scheme in Table 4
Target Gas
Percentage
[%]
Gas flow rate values to set
[Nl/min]
Air
CO
2
Air
CO
2
Total
95.00
5.00
0.60
0.03
0.63
95.00
5.00
0.80
0.04
0.84
95.00
5.00
1.00
0.05
1.05
Table 4. Flow meter regulation. Nl [Normal/liter].
Tip
►
If you need, ask Okolab for personalized Gas Percentage Tables.