Common faults of water bath thermostatic oscillator and Solutions

Common faults and solutions of water bath constant temperature oscillator, also known as water bath constant temperature shaker, are applicable to bacterial culture, fermentation hybridization, biochemical reaction, enzyme and tissue research with high requirements for temperature and oscillation frequency, and widely used in medical, biological, molecular, pharmaceutical, food, environment and other research and application fields 1 The water bath thermostatic oscillator is heated normally and the oscillation cannot work Solution: turn on the side plate of the control cabinet, turn on the power, set the temperature control to 0 degrees (i.e not heated), turn on the oscillation switch, adjust the speed to Zui high, measure whether the transformer has 220V voltage input with the multimeter AC 250 gear, if not, the switch is broken, otherwise, measure whether the transformer has 12V voltage output (with the AC 50V gear), If not, the transformer will be damaged At this time, do not replace the transformer easily In most cases, there is a short circuit fault in the rectifier part of the circuit board or the motor (in this case, the appearance of the transformer is burnt) If the above conditions are eliminated, replace it If the 12V voltage is normal, check whether there is DC 12 voltage (DC 50V) If not, the rectifier bridge will be open circuit and replaced If yes, check whether there is voltage output to the motor (about 5-8v) If yes, the motor is damaged or the mechanical part is rusted because the instrument is not used for a long time If not, the high-power tube in the control board is damaged The non oscillation can be basically solved by the above methods 2 The heating of water bath thermostatic oscillator is normal, and the oscillation speed becomes slow Solution: open the side plate of the control cabinet, turn on the power, set the temperature control to 0 degrees (i.e not heated), turn on the oscillation switch, adjust the speed to Zui high, find the two adjustable resistances on the speed control board, and adjust the right one anticlockwise 3 The water bath thermostatic oscillator is not heated, the oscillation is normal, the display is normal, the setting is normal, and heating is not possible Solution: (1) turn on the power supply, turn on the power switch, adjust the set temperature higher than the actual measurement temperature, check whether the temperature controller has output indication, if yes, measure whether the heating tube has voltage input, if yes, the heating tube is broken, replace it, if there is no voltage input heating tube, most of them are relay failures If the temperature controller has no voltage output indication, it is recommended to replace the temperature controller (2) the temperature controller shows LLL or 999 (depending on the manufacturer, the parameters are different) The fault is the open circuit or short circuit of the temperature sensor Replace the sensor (3) the temperature is not affected by control relay failure or sensor damp.