Preparing the incubator
Calibration
PRECISION
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Regularly check and calibrate every sensor. A computer can easily display a reading with several places after the decimal point, but is this actually a reliable, correct reading? A faulty sensor can also result in an incorrect reading. The ultimate accuracy of measurements depends on correctness and precision. A measurement might be very precise, or completely wrong. That is perhaps even more risky than measurements that are not accurate but correct on average! So, have all devices calibrated, and preferably by a specialised company. And always replace sensors if they deviate too often.
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For the fan in a setter, there is an option of direct drive or a belt drive, where the motor is installed outside the cabinet. The advantage of the latter is that any malfunctions can be solved while the eggs are being incubated, and the motor does not produce any unwanted heat inside the incubator. Check the v-belt every time, before starting up. A slipping v-belt can cause poor fan operation.
Once the eggs are in the incubator, it is better not to open it again, and certainly not during the first couple of days. Prevent all possible causes of malfunctions by inspecting the machine thoroughly. Pay attention to: • Hygiene (check the disinfection) • Mechanical components (fan, v-belt, cooling coils, and the turner) • Sensors (check for functionality, and that protection has been removed) • Ventilation inlets and filters (nothing blocking air exchange) Ensure that the areas outside the incubators have a stable, warm climate (approx. 25°C, RH min. 50%). This prevents large temperature fluctuations and condensation during movements, checks and other moments when the incubators are opened.
High precision Low accuracy
Low precision Low accuracy
ACCURACY
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Ensure there is good air circulation, to maintain a uniform temperature in and around all the trays. These fans provide a vertical airflow that distributes the air through the setter.
High precision High accuracy
Low precision High accuracy
The computer sets the position of valves and ventilators, but you have to check this! Not the positions, but the actual effect. If you measure air velocity (with an anemometer, see photo) and you know the diameter of the inlet/ exhaust pipe, you are able to calculate ventilation rate. Air velocity * π r2 * 3,600 = ventilation rate (m3/h). An inlet pipe with a diameter of 20 cm and an air velocity of 2 m/s gives you a ventilation rate of: 2 * π 0.102 * 3.600 = 226 m3/h.
Ha tc he ry S i gnal s
