What is a Humidity Logger?

Temperature and Humidity Data Logger (Temperature and Humidity Data Logger) is one of the temperature and humidity meters in the temperature and humidity measuring instrument. It has a built-in temperature and humidity sensor or can be connected to an external temperature and humidity sensor to measure temperature and humidity.

Temperature and humidity loggers

Temperature and Humidity Data Logger (Temperature and Humidity Data Logger)

[

Early temperature recorders were of the paper type-that is, paper temperature and humidity recorders.

With the popularity and widespread use of computers,

integrated circuit

The harm of moisture to the semiconductor industry is mainly manifested in the fact that moisture can penetrate the IC's interior through the gaps such as pins through the IC plastic package, resulting in IC moisture absorption. Water vapor is formed in the heating process of the SMT process, and the pressure generated causes the IC resin package to crack and oxidize the metal inside the IC device, causing product failure. In addition, during the soldering process of the device on the PCB board, due to the release of water vapor pressure, it will also lead to false soldering. According to the IPC-M190 J-STD-033 standard, SMD components after exposure to high humidity air environment must be placed in a dry box below 10% RH humidity for 10 times the exposure time to restore the component's "workshop" Life "to avoid scrap and ensure safety.

Liquid crystal device

Although the glass substrates, polarizers, and filter lenses of liquid crystal devices such as liquid crystal displays need to be cleaned and dried during the production process, they will still be affected by moisture after they are cooled down, reducing the qualification rate of products. Therefore, it should be stored in a dry environment below 40% RH after cleaning and drying.

Other electronic device capacitors, ceramic devices, connectors, switches, solders, PCBs, crystals, silicon wafers, quartz oscillators, SMT glues, electrode material adhesives, electronic pastes, high-brightness devices, etc., will be subject to moisture. harm.

The semi-finished product in the electronic device packaging during the operation to the next process; before PCB packaging and after packaging to power-on; IC, BGA, PCB, etc. that have not been used after unpacking; components waiting for soldering in a tin furnace; Devices that are to be warmed up after baking; finished products that are not yet packed, etc., will be harmed by moisture.

The finished electronic machine will also be affected by humidity during storage. If the storage time is too long in a high humidity environment, it will cause a failure, and the computer board CPU will oxidize the gold finger and cause a poor contact failure.

The humidity of the production environment and storage environment of the electronic industry products should be below 40%. Some varieties also require lower humidity.