This is Pedro from Tenerife, my greatings to everyone.
I have recently built my own forced air incubator out of plywood and polystyrene (a 60W light bulb as heat source and a computer fan for air circulation). Temperature is controlled with an Eliwell thermostat and humidity monitored with an Exo Terra hygrometer for terrariums. I am about to try it for the first time with fertile chicken eggs and a Hova Bator automatic egg turner which fits perfectly well inside. I have been comparing temperature readings from a clinical thermometer, aquarium thermometer and the digital display of the thermostat to check accuracy, the three of them dipped in a glass of water inside the functioning incubator set to 37.7 ºC. The fluctuation of temperature observed was 37.6 – 37.8 in short intervals (with probe outside the water). I noticed the following:
I observed that the glass of water never reached 37.7 º after operating for more than 12 hours (the whole night through) if the thermostat’s probe was not immersed in it. In other words, air at 37.7 ºC did not warm the water up to room temperature (incubator temperature). The immersed clinical thermometer (with a range of 35-42ºC) didn´t respond, the immersed aquarium thermometer showed a slight temperature rise. Only when I immersed the probe in the glass of water it reached 37.7 by means of excess in air temperature rise. It took about 15 minutes to warm up, and when the thermostat switched the power off the temperature kept rising up to 38.5 as some form of inertia.
Does anyone know if this does happen in any incubator? I fear that the eggs may act in a similar way as water and never warm up to the ideal temperature due to the poor conduction of heat from air to water.
Last edited by Pedro on Tue May 03, 2011 10:48 pm, edited 1 time in total.