How to identify A1321 heater

There are several A1321 heaters produced by several companies in China. Although the price is cheap, the quality is uneven due to various technical reasons such as the inconsistency of domestic technical standards. Some manufacturers have used the domestic A1321 heaters to burn out the transformers. The temperature is out of control and other abnormal phenomena, there are cases where there is a large deviation between the soldering station temperature and the actual temperature of the soldering iron head, which greatly increases the repair rate of the soldering station; from the cost, the current price of the domestic heating core is 10-16 yuan / Only around, the import is around 23-25 â€‹â€‹yuan, but if there is a repair, some will not be worth the loss.
In order to ensure the quality of domestic A1321 heating core and protect the interests of customers, Saiguang Tietou Factory has summarized the following experiences according to the actual customer application feedback experience for the reference to distinguish the quality of the heating core. According to the quality of the heating core circulating in the market, the heating core is divided into Class A, Class B, and Class C unqualified products. The specific grading standards are as follows (the temperature error is equal to the white light A1321 with a sensor resistance of 50 ohms):

The Class A sensor contains platinum material, the sensor resistance is 45-55 ohms, the temperature error is +15 Â°C, and the linear region is 250--530 Â°C.

The B-class sensor does not contain platinum material, the sensor resistance is 54-57 ohms, the linear region is 250--430 Â° C, the temperature is +50 Â° C, and the temperature is out of control at 430 Â° C or above.

Class C sensor does not contain platinum material below 54 ohms, 57 ohms above temperature error 50 Â° C-180 product linearity difference, it is easy to appear high temperature out of control, burned soldering station electronic parts.

Note: Linearity is the corresponding value of the temperature rise degree and the sensor resistance becomes larger. Generally, the larger the linearity, the better. The larger the temperature, the stronger the temperature capability that can be controlled.

Judging the criteria for Class A heaters:

1, the judgment of the heating core resistance;

2, the pin welding firmness;

3, heating core temperature rise linear

4, high temperature control ability

The first point: it is also very important and very easy to distinguish - the resistance value of the heating core; A1321 has a total of 4 electrodes, of which the upper two electrodes (the color of the insulating tube is blue) is a temperature-sensitive resistance wire for measuring The temperature of the heating core; the lower two electrodes (the color of the insulating tube is red) are heating electrodes, which are used to supply the power required for heating the heating core. The temperature-sensitive line resistance of the A-class heating core is in the range of 45-55 ohms, which is the most concentrated range of the temperature-sensitive resistance wire of the heating core imported from Japan; the domestic heating core below the A-class temperature is the control temperature, and the temperature-sensitive resistance is The control is in the range of 50-60 ohms. The specific reason is that the resistance of the heater core below A grade is not enough with the increase of temperature, and it must be increased by 5 ohms, but it is still prone to high temperature runaway and poor linearity. The A-class heater adds platinum to the temperature sensing line, making its electrical parameters consistent with 99% of the imported heater.

The second point: the firmness of the solder joints; the problem of falling of the heater core electrode is often encountered during installation. If it falls directly, it is good luck, but if the soldering station is out of the customer, the electrode will drop. Quality accidents and the possibility of losing customers, so this is a very important reference parameter indicator. The specific operational test and minimum standard of this indicator is to draw the electrode wire and the heating core rod at a 90-degree angle and apply 3 kg external force to pull it off. Some of the A-class heating cores can reach more than 8kg and the tensile force does not fall off.

The third point: the linearity and temperature control of the product; the linearity is an important criterion for evaluating the quality of a soldering station, and the linearity of the soldering station is 100% depending on the quality of the heating core. The general heating core is calibrated at 350 Â° C, and then continuously increases or decreases the operating temperature in units of 20 Â° C, and uses a thermometer to measure the temperature of the soldering iron during use (recommended using the Japanese white light 191 thermometer) The deviation is better in the range of +15 Â°C, the quality of 15-50 Â°C is higher than the range of this range, and the above is 50 Â°C.

According to the market sampling test, the heating core of the platinum-containing material has a linearity of the heating core in the range of 45-55 ohms and its performance is close to that of the Japanese product (error 0--+15 Â°C) 350-530 Â°C temperature. The heating core without platinum material is difficult to achieve linearity, so it is easy to make the machine temperature debugging difficult to unify, and the phenomenon of high or low temperature occurs after the machine installs a new heating core.

The fourth point: high temperature control ability, set the soldering station temperature to 480 Â° C (also must select the temperature line resistance value in the range of 45-50 ohms), if the soldering station has been shown to be heated, but the temperature can not reach 480 Â° C That is the temperature is out of control, this is a very serious problem. The main situation is not that the soldering station is heated to less than 480 Â° C, but the temperature has reached or even exceeded 480 Â° C. However, the signal from the heating core to the soldering station is still not enough, so that the continuous high current causes damage to the transformer or other electronic components. The customer has brought a lot of damage.

! ! ! Therefore, we must pay attention to the resistance values â€‹â€‹of the two types of heater cores during the test: the temperature resistance of the temperature sensing line must be selected in the range of 45-50 ohms. Otherwise, the test results cannot be distinguished from the Japanese parameters.

Summarize both

The heating core with platinum material has good performance, long life and good linear consistency. The temperature resistance of the wire is mainly 45-55 ohms, the common temperature is 250-530 Â°C, and the error is Â±15 Â°C. The soldering station can be accurately modified without modifying the circuit. temperature control.

The heating core without platinum material has high temperature, large error and relatively short life. The temperature resistance line is mainly 54-57 ohms, the common temperature is 350-420 Â°C error 20--40 Â° C; the temperature is less than 54 ohms. A lot higher, the temperature control range is 300-450 Â°C; other temperature error is large. The price of the unqualified product is low but not recommended, otherwise it will easily damage the soldering station host.

After the above identification method is adopted, the quality of the heating core is controlled, and the soldering station repair rate can be restored to a normal level.

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