At present, the temperature control circuit of the electric constant temperature incubator is commonly used to show the cut-off burning principle when the gate voltage of the electron tube is at a certain value. The mercury contact thermometer controls the presence or absence of the gate voltage of the electron tube, thus making the relay work coil. There is a voltage pull-in, no voltage release, control whether the heating wire is heated or not, and the purpose of controlling the temperature inside the box.

Thermoelectric incubator A circuit l, connected to the power supply, 2, the electron tube is in a saturated conduction state, 3, the relay coil has a greater than the pull-in voltage and pull-in; 4, the relay normally open contact receives the heating wire heating; 5, electricity According to the point of mercury meter, the mercury column rises and the metal wire is connected; 6. The cut-off voltage is added to the grid; 7. The electron tube is in the cut-off state, 8. The relay coil loses pressure to release; 9. The heating is stopped.

Electric thermostatic incubator B circuit 1, connected to the electric cup; 2, the cut-off voltage has been added to the pole, 3, the electron tube is in the cut-off state; 4, the relay kicks the normally closed contact through the electric heating wire to heat; 5, the electric contact The mercury column of the thermometer rises and the wire is connected. 6. The short-circuit voltage of the cathode and the gate of the electron tube is zero. 7. The electron tube is in a saturated conduction state; 8. The relay coil has a voltage greater than the pull-in voltage to close the normally closed contact. 9, stop heating.

Normally, the electric constant temperature incubator is cultured with derivatives. If the beam is not heated for a short period of time due to a failure, the temperature inside the tank will not decrease much, and it is even less likely that it will drop below the chamber. The Lord, for most J audio and nourishment, is the growth retardation at most. However, due to the failure of heating, the culture died. From the actual use of the point of view, under the same conditions, heating in a short time is not always better than heating in a short time. In other words, overheating is the main danger to the incubator. In addition, the circuit in Figure B uses the natural state of the relay to heat the contacts by spring force. Due to the small contact force. Often due to poor contact with the fire and melting can not be disconnected, resulting in overheating thermostat. In summary, the A circuit is better than the B network. In the maintenance practice, the circuit of Figure B is often converted to the circuit of Figure A, and good results have been obtained.

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