Fault detection of small laboratory heating and cooling machine

The current small laboratory heating and cooling machine is generally controlled by the output signal of the computer board.
If there is no heating, first check whether the computer board is faulty.
In general, the computer board will not fail.
You can use a multimeter to check the computer board.
test
.

The small laboratory heating and cooling machine is mainly used in the fields of chemical, pharmaceutical and biological supporting glass reactors, rotary evaporators, fermentation tanks, calorimeters; widely used in pharmaceutical, biochemical, and other research departments, colleges and universities, factory experiments Laboratory and measurement and quality inspection department
.

The liquid circulation of the whole system of the small laboratory heating and cooling machine is closed.
The system has an expansion vessel.
The expansion vessel and the liquid circulation system are adiabatic.
They do not participate in the liquid circulation, but are only mechanically connected.
Regardless of the temperature of the circulating liquid, the expansion The medium in the container is kept at room temperature at all times
.

　　The whole liquid cycle of the small laboratory heating and cooling machine is airtight, with an expansion vessel.
Regardless of whether the temperature of the liquid cycle is high or low, the heat transfer medium in the expansion vessel is close to room temperature, and there is no absorption of water vapor at low temperature and no oil mist at high temperature.
The generation of circulating heat transfer medium can work in a wide temperature range
.

The small laboratory cooling and heating integrated machine has a wide temperature control range, no need to replace the heat transfer medium in the whole process, less heat transfer medium consumption, and closed circulation of the heat transfer medium, which ensures the safety and life of the heat transfer medium
.

High temperature, emergency stop, leakage, overcurrent, overheating and other multiple protections, fully guarantee the safety of use
.

High-lift design, to meet the long-distance transport of heat transfer medium
.

　　Another problem is that the heating tube of the small laboratory heating and cooling machine is faulty.
You can use a multimeter to detect the resistance of the electric heating tube.
If there is no value, it means that the heating tube is faulty, otherwise it is not
.

In addition, small laboratory heating and cooling machines are generally equipped with cooling devices.
Some non-heating phenomena are due to the fact that the cooling device is always open, and the cooling water continues to enter the heating device, which will also cause the equipment to not heat.
phenomenon, only need to test the cooling solenoid valve
.

Disassemble the cooling solenoid valve, clean it, and see if there is any foreign matter stuck.
You can also use a multimeter to check whether the circuit is always open, or replace the corresponding solenoid valve to check its function
.