There are many types of temperature control instruments, and the scope of application is also very extensive. When users use temperature-controlled instruments, they need to understand their use of knowledge, which is very helpful for users' later use. There are many problems that need to be noticed when using temperature control instruments. Users must also understand. Today Xiao Bian came to introduce you to everyone, hoping to help everyone.
First of all, the thermal engineering instrument should be installed and wired correctly according to the requirements of the instruction manual. Verify the wiring is correct, before sending the test machine.
Secondly, whether the temperature setting value is correct or not is directly related to the execution of the process parameters, thereby affecting the temperature level. Therefore, before starting the machine, you should carefully refer to the process parameters and select the temperature setting value to avoid temperature deviation.
For moving coil temperature control instruments, when the temperature is near the set value range, the pointer is higher or lower than the set value, the individual instrument pointer will appear stuck, in this case just tap the instrument surface with your finger The pointer will return to the setting value.
The third is the phenomenon of death. Individual meters (mostly with digital display meters mostly) in the process of booting, if the temperature is higher than the set value of about (8 ~ 10) °C or even higher output, or below the set value (8 ~ 10) °C or even Lower, and still continue this phenomenon, is the phenomenon of death.
This is mainly caused by the reduction of the instrument's own anti-interference ability. The most common is the electromagnetic interference caused by the action of the contactor or intermediate relay. In this case, the power of the instrument can be turned off for about 20 seconds, and then the power can be turned off. If it cannot be eliminated, the electrician and electrician may be required to deal with it in time and must not handle it on their own, so as to avoid the increase of the fault.
The fourth is the thermocouple (thermal resistance) factor. There are basically two reasons why thermo-control instruments are not allowed (other than inferior products) due to thermocouples:
One is that the indexing numbers do not match. The reason is that when the thermocouples are replaced, the instrument's index number is not carefully understood, so that the thermocouples with other indexing numbers are misapplied. The consequence is that the temperature difference of the instrument is too large (more than ten degrees Celsius to tens of degrees Celsius). (Celsius is not equal), the temperature is out of control, causing the cable surface rough or scorch. Therefore, the replacement of thermocouples must be careful, the index number can not be wrong.
The second is that the tightness and depth of contact between the thermocouple and the detection point will also cause the temperature deviation of the instrument. Common misuses are: Thermocouples are clamped directly in the heating ring or thermocouples are placed directly in the holes in the detection point. They are not spring-loaded and fixed. The direct consequence of this is that they do not reflect the true temperature of the detection point. The correct method is to insert the thermocouple vertically into the detection hole. The minimum insertion depth should be (5~8) times the outer diameter of the protection tube and it should be fixed with a spring so as to reflect its true temperature.
Fifth, the thermal instruments in use should be regularly verified by the measurement department. Unqualified thermal instruments shall be replaced in time to ensure the accuracy of the temperature data. The newly purchased thermal instruments shall be tested before use and put into use.
To remind everyone that any temperature control instrument's own parameters have been preset, the operator can not set and change the instrument function parameters. For example, the U, P, I and D parameters in the UGU-708 series digital temperature control instrument produced by Xiamen Yuguang Instrument Co., Ltd., output cycle Ctl, input specification Sn, main input translation correction Sc, etc., in order to avoid causing large deviations and thus affecting Instrument performance and temperature control accuracy.
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