The control circuit adopts the switch control of the solenoid valve, and is cooled by the cooling water into the water jacket of the tank to control the temperature at the fermentation temperature (28±1 °C). The comparator A3 and the temperature control potentiometer W3 connected to the non-inverting terminal form a temperature comparison discriminating circuit. When the measured temperature is lower than the set value, the comparator A3 outputs a high level, and the corresponding 555 circuit is not turned up due to the high level of the 2 pin, that is, the 3 pin outputs a low level, and the second stage 555 circuit is powered by the power supply. The circuit does not work and does not work; when the measured temperature is higher than the set temperature, the comparator A3 outputs a low level, so that the 555 is set because the 2 pin is low, the 3 pin outputs the high level, and the lower level 555 is At the beginning, the 2 pin is set to the low level, the 3 pin outputs the high level, and the BG1 is turned on, and the buzzer sounds.
The alarm circuit consists of a comparator A4 and a buzzer circuit. When the temperature exceeds 29 °C, the potential set by the inverting terminal of A4 is compared with the output of A2, A4 outputs a high level, which turns BG2 on, emits a buzzer sound, and the warning light LED3 lights up (orange light) In order to remind the duty personnel to pay attention to troubleshooting, so that the temperature is controlled within the most suitable range of yeast.
This circuit can control the temperature at 28+1 °C. When the temperature exceeds 29 °C, the circuit will emit an audible and visual alarm signal to remind people to carry out timely processing.
Gas relay is a classification of Signal Relay, which is commonly used in automatic control system. It is generally used to connect and disconnect circuits, and is an important component of automatic control and remote control circuits.
Gas Relay,Gas Mini Relay,Signal Gas Relay,Dc Gas Relay
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