What are the application instructions for electronic waterproof scales?

Common waterproof methods for waterproof scales: Through the practical application and exposed problems of waterproof scales, engineers from various scale manufacturers have actually realized the harm of water vapor and proposed different solutions:

1. To strengthen the protection of motherboard modules, the most commonly used method is to fill the motherboard with sealant with good moisture and heat dissipation properties. This is an effective method that can prevent damage to the motherboard from water vapor that has already entered. Due to its simple operation and good moisture resistance, it is widely used. There are many available potting adhesives on the market, such as 704-781b73px804c, but these potting adhesives often require 50-60 long baking times to cure. Therefore, there are high requirements for the high temperature resistance of the entire circuit board, and this fully sealed packaging method also has strict requirements for the heat generation of the circuit board. Only high integration and low heat generation components can be used, so the manufacturing cost will be relatively high when the production quantity is small. Moreover, if the circuit board is damaged, it cannot be repaired and can only be replaced, The price of over a hundred yuan is also a significant burden for users. This method guarantees a lifespan of up to 2 years, but the effect is still not ideal.

2. Use softer sealing strips to apply greater locking pressure. But the original ABS plastic can no longer provide sufficient strength, so replacing the shell with higher strength materials such as high-strength plastic stainless steel has the disadvantages of increased cost and unclear effect, because under thermal expansion and contraction, the breathing effect of the shell can suck in external water vapor into the shell, and the overly soft sealing strip material is not dense enough to prevent the passage of water vapor. Removing the sealing strip and sealing the upper cover and base with sealant cannot repair the circuit board. If the outer shell is broken, it will not be worth the loss.

The corresponding solution for waterproofing of waterproof scales in mechanical structures is to address the urgent need of users for a low-cost, waterproof, and easy to maintain waterproof scale. Based on the current waterproof structure, a new waterproof scale structure is proposed. The characteristic of this structure is to replace the direct sealing of the circuit board with a transparent sealing box. The sealing box is made of transparent material to avoid affecting the observation of LED display. On the one hand, the sealing box can facilitate the maintenance of the circuit board. On the other hand, the desiccant inside the box can absorb the invading water vapor at any time, keeping the circuit board dry. As long as the desiccant is replaced regularly, the cost of the sealing box is not high compared to the current direct sealing of the circuit board, and it reduces the requirements for the high temperature resistance of the circuit board, As a result, the cost has been reduced. In addition, the welding points connecting the cables are concentrated in the junction box for convenient centralized sealing, avoiding problems such as virtual sealing and leakage caused by multiple sealing points. The performance of the waterproof scale has been improved from liquid water resistance to vapor water resistance. The improved waterproof scale can fully achieve the IP67 protection level in waterproof tests and has also achieved good results in waterproof vapor tests, which can meet the needs of most users in the market.

What are the factors that affect the accuracy of waterproof scales? Non load calibration can achieve high accuracy, with an accuracy of about one thousandth, which can meet the precision and process requirements of most industrial processes. However, this method does not consider the mechanical influence in the scale. Therefore, before calibration, the mechanical installation and sensor installation quality should be strictly checked to ensure that they meet the requirements of the installation drawings. At the same time, attention should be paid to the influence of calculation errors, measurement errors, and operating methods. When there is a large difference in gravity acceleration between the sensor testing site and the usage site, the influence of gravity acceleration should be considered.