18
AF37 US Issue 01
6 HUMIDITY AND VENTILATION
SETTING THE RELATIVE HUMIDITY LEVEL
1.
Press the - and + buttons
simultaneously to unlock the
Main Menu.
2.
Press the + button to scroll to
the RH% option.
3.
Press OK to select the RH%
screen and adjust as
necessary using the + and –
buttons.
4.
Press OK to return to the
Main Menu and then scroll
down to SAVE. Press OK to
save the changes.
ADJUSTING THE VENT
Opening and closing the vent: Close the vent to
increase humidity or open the vent to decrease
humidity.
The pump will not run if the incubator is significantly below the set temperature (including during periodic incubation cooling – see
section 8). This is to prevent the system adding too much water when the top has been opened for inspecting eggs etc.
In all cases the humidity for hatching needs to be high. Because of the short duration involved water/weight loss will not be
significantly affected. High humidity is necessary to prevent membranes drying and hardening before the hatch fully emerges. Humidity
will naturally increase as the first eggs begin to hatch and internal membranes begin to dry. This is in addition to the water added by
the pump.
During hatching the high humidity levels will fall dramatically when the lid is opened and will take some time to build up. Resist the
temptation to lift the lid frequently – leave for at least 6 hours between inspections.
The control system may be set to control between 20 and 80% RH. In practice the minimum and maximum levels of humidity
achievable in an incubator depend upon several factors including the ambient conditions in the incubation room. You may need to
allow 24 hours for humidity to fully stabilise after making changes.
If you cannot achieve the relative humidity level required consider these notes:
Humidity will not go low enough
The humidity control system can only increase humidity, not actively reduce it. Open the vent fully to help.
A lower limit will be determined by the moisture content of the ambient air, particularly in warm humid conditions. This can
only be countered by dehumidification of the room air outside the incubator with a proprietary dehumidifier but is rarely a
problem in practice.
Humidity will not go high enough
Close the vent to its minimum setting to help.
Check that water is reaching the incubator when the pump runs – if not check the whole length of the tubing for kinks and
check that the tubing around the pump has not become permanently flattened. If it has, try stretching it gently to open it. If
that fails replace the pump tube (see page 10). Silicone tubing is very flexible but can be damaged by sharp finger nails. A tiny
perforation on the suction side of the pump will let in air and prevent the pump drawing water.
The tubing around the pump must be replaced periodically, typically every three months but this varies with use. See page 10
for details.
Condensation
It is normal for some condensation to occur on the cooler exposed parts of the clear top. This natural phenomenon is not a hazard or a
problem for incubation but may indicate the room is cooler than optimum.
OPEN
CLOSE
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