Typical application of temperature and humidity recorder
typical application
1, food storage and transportation
Since the storage and transportation time of food is not a short-term problem, the relative equilibrium humidity in food preservation is an important indicator to ensure food safety. The relative equilibrium humidity directly affects the growth of colonies. For example, in the range of equilibrium relative humidity of 95% RH to 91% RH, the colonies that are easy to grow are Salmonella, Blint, Lactobacillus, Mold and Yeast. The food preservation cycle is also related to temperature and equilibrium relative humidity. The balance of the relative humidity value is 81% RH. The shelf life is 14 days at 27 °C and 24 days at 21 °C. If the equilibrium relative humidity is increased to 85% RH, these The indicator will be reduced to 8 days at 27 °C and 12 days at 21 °C. The equilibrium relative humidity of the hygroscopic material plays a decisive role. Balanced relative humidity is defined as the humidity value obtained by the surrounding air when the substance is not exchanged with water in the air. This definition is clear, in order to successfully store and maintain these products, environmental climate control and packaging must be carefully specified. At the same time, many foods are stored in too dry conditions, and their taste will be somewhat deteriorated. In response to this situation, it is required to record changes in temperature and humidity in real time to ensure food safety enters the consumer's mouth.
When transporting frozen or refrigerated foods over long distances, it is very important to prove that the goods are always in the specified temperature and humidity conditions when receiving. The solution to the dispute is to put a recorder in the cargo compartment at the time of shipment and start it. The temperature and humidity recorder has a sophisticated internal clock that faithfully records the temperature and humidity data at specified intervals, which can be easily removed when removed. Use the computer to check the graphic files and alarm values ​​to determine whether the allowable value is exceeded, when and how long the time can be easily obtained, and the carrier is immediately aware of whether it is responsible.
2. Museum cultural relics and file management
This is another big area of ​​application for temperature and humidity products, and the recorder is a very distinctive product among them. File paper
In the appropriate conditions of temperature and humidity, you can store more time, and once the temperature and humidity conditions are damaged, the paper will become brittle, and the important information will disappear.
It is necessary to record the temperature and humidity in the archives to prevent the occurrence of malignant accidents. The use of temperature and humidity recorders will simplify the work of recording temperature and humidity, and will also save the cost of cultural relics storage, so that this work can be scientifically scientific and not subject to excessive human factors. Under the premise of ensuring minimal damage to art, cultural relics, including their color and shape, are not damaged.
3. Building materials experiment
In the drying process of building materials, especially concrete, we should pay attention to the drying trend, which is one of the indicators for evaluating products, and also provides reliable data for the construction party. This data can be recorded and provided to the building materials researcher using the temperature and humidity recorder, which will provide useful help for the construction. Especially in military buildings, time is life, accurately grasping the concrete drying time as the first enemy, providing a guarantee for effectively providing the living force to the battlefield.
Acceptance of intelligent buildings. Due to the many acceptance projects in the construction industry, in addition to the HVAC indicators, other construction departments such as ray intensity and formaldehyde concentration are required to be monitored in accordance with human health indicators. These indicators are directly related to human health. If these indicators are unclear, the testers rush into these places and record them for a long time, which is irresponsible for the tester's personal health, and the application recorder will ensure that the test is obtained while obtaining reliable data. The personal safety of personnel is maximally protected.
4. Agriculture, forestry and animal husbandry
Application of agriculture, forestry and animal husbandry: agriculture, forestry and animal husbandry production, especially the production of some economic crops, in which the temperature and humidity values ​​should be recorded in detail during the seedling period. In agricultural applications, the acid-alkaline environment caused by the harsh environment-fertilizer, feces, etc. causes the humidity product to drift beyond other environments, which requires less humidity-sensitive capacitance drift and easy calibration.
5. Important medical and health sites
According to the requirements of the "Consultation Draft for the Construction Technical Specification of the Hospital Cleansing Department", the temperature and humidity of the operating room must be controlled within a certain range: the temperature is 22...25 °C; the relative humidity is 45% RH...60% RH. Appropriate ambient temperature and humidity are very important for both the operator and the patient. When the room temperature exceeds 28 ° C, the humidity is greater than 70% RH, it is easy to have sultry, sweating, irritability, fatigue and other reactions, easily affecting the stability of the mood and agile thinking, so that the operator's skills
The level of surgery cannot be well played. At the same time, the patient may have symptoms such as rapid heart rate and sweating, which increases the difficulty of surgery; when the room temperature is lower than 20 degrees, the operator wearing only the surgical gown may feel cold and easily affect the sensitivity and accuracy of the operation, especially The subtle movements of the fingers. The exposed patient is at a lower level due to the resistance of the wound body, and is more prone to complications such as a cold. The indoor humidity is low, and the floating dust on the surface of the object is suspended in the air with some movements such as paving the door, opening and closing the door, etc. The temperature difference between the inside and outside of the operating room is large. The air in some areas after the opening of the door forms a vortex, and the wind speed increases to about 4 times the original wind speed in the operation room. At this time, the surface attachments quickly float in the air. According to a survey conducted by the US CDC, there is a risk of airborne infection when the number of floating bacteria in the operating room air is 700-800 cfu/m3. It can be seen from the results that the air pollution is most serious 2 hours after the operation from the time of the operation to the time of the single order, which is the surgical stage. Due to the effect of gravity, indoor dust can be directly deposited on the surgical wound, or the operator's hand or surgical instruments. Therefore, it is important to strengthen the control of air pollution during this period to prevent postoperative wound infection. These requirements require the health and epidemic prevention departments to confirm the compliance of the operating rooms of each hospital through their own monitoring. The recorder is a good method, which reduces the waste of personnel and ensures the fairness of law enforcement.
6, pipeline maintenance
Moisture in the pipeline promotes microbial growth, and mold on the pipeline is formed as such. This not only affects air flow, but also breeds a lot of bacteria. These contaminated areas pose a threat to health and ultimately lead to a deterioration in indoor air quality (IAQ). The solution medium temperature and humidity recorder can also play a big role.
Folding 7, humidity damage to electronic components and the whole machine
★ Integrated circuit
The harm of moisture to the semiconductor industry is mainly manifested in the fact that moisture can penetrate into the IC through the gap of pins and the like through the IC plastic package, resulting in IC moisture absorption. Water vapor is formed in the heating process of the SMT process, and the generated pressure causes cracking of the IC resin package and oxidation of the metal inside the IC device, resulting in product failure. In addition, when the device is soldered during the PCB board, the solder joint pressure will also cause the solder joint. According to the IPC-M190 J-STD-033 standard, SMD components exposed to high-humidity air must be placed in a drying oven below 10% RH humidity for 10 times of the exposure time to restore the component's “workshopâ€. Life", avoiding scrapping and ensuring safety.
★ LCD device
Although the glass substrate and the polarizer and the filter lens of the liquid crystal display such as the liquid crystal display are to be cleaned and dried in the production process, they are still affected by the moisture after the temperature is lowered, and the yield of the product is lowered. Therefore, after cleaning and drying, it should be stored in a dry environment below 40% RH.
★ Other electronic components capacitors, ceramic devices, connectors, switch parts, solder, PCB, crystal, silicon wafer, quartz oscillator, SMT glue, electrode material adhesive, electronic paste, high-brightness devices, etc., will be wet Hazard.
★ The semi-finished products in the electronic device package during the operation to the next process; before and after the PCB package and between the power supply; IC, BGA, PCB, etc. after unpacking but not used up; The device that is to be warmed up after baking; the finished product that has not been packaged, etc., will be exposed to moisture.
★ The finished electronic machine will also be exposed to moisture during storage. If the storage time is too long in a high-humidity environment, it will cause a malfunction, and the CPU of the computer board will oxidize the gold finger and cause a malfunction.
The production environment of electronic industry products and the storage environment of products should be below 40%. Some varieties also require lower humidity.
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