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Yoghurt Incubator (Practical Action Brief)
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== The incubators == The yoghurt incubators developed had slight modifications to the industrial incubator. Practical Action South Asia designed two models: one which is manual and one that is semi automatic: The basic structure is the same with the difference being the thermostat unit. The incubators introduced by Practical Action South Asia aluminium frames with [[rigifoam insulation]]. The rigifoam insulation is for heat retention which increases the efficiency and reduces the electricity consumption. The incubator has two chambers with 6 removable shelves in each chamber. Bulbs are installed at the base of the incubator to supply the required heat. The incubator has a glass front so that it can be judged visually when the yoghurt has matured and ready to be taken out. In the manual model, the heat source (the bulbs) have to be turned on and off as required and the incubator temperature needs to be monitored. In the semi-automatic version, the thermostat turns off when the required temperature is reached and does not need to be monitored. The incubator could have an internal fan which helps regulate the heat (by 4-5 degrees) but optional. If the incubator has the fan, it will increase the cost of construction, operation (electricity) and maintenance. This would keep the same flavour and consistency in all the yoghurt cups in the incubator. In the semi-automatic incubator, the internal chambers can be sterilised easily by setting the thermostat to 100°C. This allows the production process to be more hygienic by removing any unwanted bacteria that could spoil the yoghurt or alter its taste. The introduced yoghurt incubator has these advantages: * The heat can be regulated<br> * It is insulated to minimise heat losses<br> * It can be easily cleaned after every batch<br> * It can be sterilised without dismantling<br> * It can be fabricated and maintained locally<br> * It is more efficient and durable<br> '''Technical details'''<br> Material required {| style="width:50%; height:50px" border="1" ! Material ! Specification ! Quantity |- | Aluminium Angles | ½" X ½", 12ft lengths | 03 Nos. |- | Aluminium Angles | ¾" X ¾", 12ft lengths | 10 Nos. |- | Aluminium Tee Sections | 1" X 1" , 12ft lengths | 06 Nos. |- | Aluminium "U" Sections | 12ft lengths | 01 No. |- | Aluminium sheet | gauge 20 x 8" x 4" | 01.5 Nos. |- | Welded Mesh | 75 mm2 04 m2 | |- | Plain Glass | 0.8 m2 | |- | Bulbs | 40W | 10 Nos. |- | Dial Type Thermometer | 0° - 100°C | 01 No. |- | Thermostat* | Wall mounted, adjustable | 01 No. |- | Electric fan** | Low profile box fan - vertical operation | 01 No. |- | Wires, teflon sleeving, connectors, self tapping screws etc. | As required | |} * The thermostat is needed for the semi-automatic model ** The fan is optional
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