Pharmaceutical industry drug testing center personnel, frequent use of electric constant temperature incubator, drying box, the two kinds of equipment, culture, drying, heat treatment temperature is generally between 3000 °C. The methods used to control the temperature in such electric thermostatic incubators and drying ovens are mostly thermal expansion thermostats. Their operating principles are:
A temperature measuring rod is installed in the working chamber, and the thermal expansion coefficients of two different metal materials are different. The temperature is sensed and the temperature is controlled by manually adjusting the bamboo device. Low, low sensitivity, temperature display requires the use of box top beam J glass thermometer. After a certain period of time, due to mechanical wear, the temperature regulator is damaged, causing the temperature to become out of control and the device cannot be repaired. Through simple technological transformation, the digital temperature indicating control instrument with strong versatility and low price is used. With the PT10C platinum thermal resistance temperature sensor, it can set and measure temperature as a whole, at the same time, the temperature display is clear and no parallax is detected. High temperature accuracy, N can be stable and reliable. The specific transformation is as follows:
First, the required materials
With a thermal resistance digital temperature controller one; WZP-23 å“„ white heat resistance one (insert depth depending on the box is small and set); CJ10-10 220V AC contactor; a number of wires.
Second, the transformation method
Remove the existing temperature measuring rod and temperature adjustment y device, according to the size of the instrument in the original temperature adjust bamboo device at the hole, fixed installation of the instrument, and the heat resistance into the studio, according to the wiring diagram.
Third, the electrical schematic
Fourth, use
After the electric thermostat incubator is energized, set the “Set/Measure†switch to the set position, and adjust the rr-J “set to adjust rJ†knob until the display setting value is the temperature to be controlled. Then set the “Setting/Measurement†switch back to the measurement file. The displayed temperature value is the actual value of the measured temperature. The indicator light of the instrument reflects the working status of the drying oven as the continuity of the relay.
When the actual temperature is lower than the set temperature, the meter relay is always low, the coil of the contactor is energized, and the normally open contact pulls in and heats up; when the actual temperature is higher than the set temperature, the meter relay is always off and the heating wire is turned off. .
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