In the process of storage of various materials, the temperature and humidity environment of the warehouse can not ignore the impact of materials. If the temperature and humidity are too high or too low, the quality of the materials may be developed in a bad direction. Only the monitoring and control of the temperature and humidity environment can be ensured. Only in this way can the safe storage of stocks be guaranteed. Various kinds of warehouse temperature and humidity monitoring instrument types, measurement principles, main advantages and disadvantages, and development trends, etc. are introduced in detail, which provide reference for the selection of temperature and humidity monitoring instruments in the warehouse.
Temperature and humidity monitor, according to the function can be divided into: temperature monitoring equipment, humidity monitoring equipment, integrated temperature and humidity monitoring equipment, specific classification and characteristics are as follows:
1.1 Classification and Characteristics of Temperature Monitoring Instruments (1) Traditional thermometers include: mercury thermometers, alcohol thermometers, and metal reed thermometers.
Mercury thermometers are still a standard for measuring various temperatures.
(2) Electronic thermometers are manufactured on the basis of various temperature sensor technologies and have digital display and data transmission functions. The technology is mature.
1.2 Classification and Characteristics of Humidity Monitoring Instruments (1) Traditional moisture meters include: hair hygrometers, sausage casing hygrometers, and metal reed hygrometers that utilize the principle of moisture absorption and expansion of materials: The advantages are low cost, and the disadvantage is that the accuracy is not high.
Wet and dry bulb hygrometers and ventilated dry and wet bulbs that use moisture to evaporate and absorb heat: The advantage is the high measurement accuracy under ideal conditions. The disadvantage is that the ideal state is difficult to achieve and the use is inconvenient.
(2) The electronic humidity meter is manufactured on the basis of the electronic humidity sensor, which can directly display the humidity value and perform data transmission. The disadvantage is that the accuracy, sensitivity, and service life are not ideal.
1.3 Integrated temperature and humidity monitoring instrument classification and characteristics (1) The traditional integrated temperature and humidity table includes: hair temperature and humidity table, wet and dry ball temperature and humidity table.
(2) Digital integrated temperature and humidity meter Because it is difficult to develop a single sensitive element that can measure temperature and humidity at the same time, the integrated temperature and humidity monitoring instrument uses two kinds of sensitive elements, namely, temperature measurement and humidity measurement, in the same sensor. Its characteristics are mainly: the combination of setting and use is more convenient; the overall performance is mainly limited by the humidity sensor and is similar to the humidity monitoring instrument.
Because the temperature and humidity monitor adopts different temperature and humidity measurement principles, the temperature and humidity instruments are various. When choosing, consider the actual application environment and requirements of the user, such as the measurement range, measurement accuracy, output and display, installation method, and sampling method. Gas types, materials and structures, control monitoring requirements, environmental hazards, etc. In addition, factors such as cost-effectiveness and maintenance workload should also be considered.
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