Temperature and humidity measurement is a new field developed by modern measurement, especially the measurement of humidity is constantly advancing. After going through the length and wet-dry methods until today's electrical measurements, humidity measurement technology has matured. Since today, we are no longer satisfied with the measurement of temperature and humidity, especially the monitoring of some places directly requires real-time recording of temperature and humidity changes throughout the process, and based on these changes, the safety of storage and transportation processes is determined, resulting in new temperature and humidity. Measuring instrument - the birth of temperature and humidity recorder.
The temperature and humidity recorder measures the temperature and humidity parameters and stores them in the internal memory at predetermined time intervals. After the recording function is completed, it is connected to the PC, and the stored data is presented and pressed according to the value by the adaptation software. , time for analysis of the instrument. The instrument can be used to determine that any events that endanger the safety of the product during the storage and transportation process, the experimental process, and other related processes.
The following uses the ZDR-20 type temperature and humidity recorder produced by Hangzhou Zeda Instrument Co., Ltd. as an example to introduce the principle and application of the temperature and humidity recorder:
Principle: The temperature and humidity recorder consists of three parts: measurement part, instrument body, and PC interface.
The following sections introduce these three parts:
Measurement part: temperature sensor and humidity sensor.
Temperature sensor: ZDR-20 series temperature probe consists of NTC and pt1000 series. Different probes perform different functions:
NTC Universal Probes: Used for general purpose measurements, including room, laboratory, container space, etc., with an accuracy of ±0.5°C, size: 5mm in diameter, 25mm in length.
Pt1000-1 temperature sensor high temperature probe, up to 300 °C. For high temperature environments.
Pt1000-2 type high-precision temperature sensor probe, the highest accuracy can reach ± ​​0.2 °C, used in laboratories and other places requiring high precision. The size is 3mm in diameter and 30mm in length.
The above temperature probes can be combined according to user requirements to complete different functions. )
Humidity sensor: ZDR-20 series humidity probes are all imported Honeywell humidity sensors from the United States. The accuracy is ±3%, even ±2%, and the measurement range is from 0 to 100% RH. The size is 7-13mm in diameter and 17mm in length.
(All the above temperature and humidity probes can be built-in or externally for customers with different needs)
Instrument body: ZDR-20 recorder, measured by the probe, the data stored and transmitted to the PC, the storage capacity of 9890 sets of data (temperature, humidity, each 9890 points), recording interval of 2S to 24h continuously adjustable: from PC software adjustment, according to its set value to determine the recording time up to 26 years.
The operating temperature of the recorder is limited by the battery, ie lithium batteries: -20 to 100 °C; alkaline batteries: -10 to 50 °C.
Range and accuracy are determined by the probe, range: up to -40 to 300 °C, 0 to 100% RH;
Accuracy: ± 2% RH ~ ± 3% RH, ± 0.2 °C ~ ± 0.5 °C;
Protection: sealed and waterproof.
Instrument size: 58mm*72mm*29mm.
PC interface: ZDR software. Software support is an indispensable part of the recorder. Its main functions are: setting the recording interval (any adjustable from 2s to 24h), setting the stop mode, setting the start time, reading the data and displaying the measurement data, history curve, etc. , Provides the printing function, converts the data into the EXCEL or the WORD document form and so on the function, this is an integral part of the data recorder. A good PC software can provide the most extensive support for the recorder, through the host computer support, keyboard and other unnecessary parts to liberate, while providing more resources to use.
typical application:
Food storage and transportation: Because the time of food storage and transportation is not a short-term problem, the relative balance of humidity in food preservation is an important indicator of food safety. Relatively balanced humidity directly affects the growth of colonies. For example: In the range of 95%RH to 91%RH, the number of colonies that can easily grow is Salmonella, Pollinella, Lactobacillus, Mold, and Yeast. The food preservation cycle is also related to temperature and equilibrium relative humidity. The cake with a relative humidity of 81%RH has a shelf life of 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 hygroscopic substances plays a decisive role. Balanced relative humidity is defined as the value of humidity obtained from the ambient air when the substance is not exchanged with water in the air. This definition is very clear, in order to successfully store and maintain these products, the environmental climate control and packaging must be carefully specified. At the same time, many foods are kept too dry and their taste will deteriorate. To address this situation, it is required to record changes in temperature and humidity in real time to ensure that food safety enters the mouth of consumers.
When long-distance transport or sea freight refrigerated foods, how to prove that the goods have been in the specified temperature and humidity conditions is very important when receiving. The solution to the controversy is to place a recorder in the cargo compartment and start it at the time of shipment. The temperature and humidity recorder has a precise internal clock that faithfully records the temperature and humidity data for a specified time interval and can be easily retrieved when removed. Use the computer to view the graphic file and the alarm value to determine whether it exceeds the allowable value, when and when the duration can be easily obtained, and whether the carrier’s responsibility is immediately known. At present, Shanghai's famous foreign-invested enterprises Haagen-Dazs and Hangzhou KFC Foods Co., Ltd. have found a powerful way to scientifically manage refrigerated transportation through the use of our products.
Museum heritage, archives management: This is another major area of ​​application of temperature and humidity products, and the recorder is also a very unique product. The paper in the archive can be stored for some time under conditions of suitable temperature and humidity, and once the temperature and humidity conditions are destroyed, the paper will become brittle, and important data will also disappear. It is necessary to record temperature and humidity in the archives. Prevent the occurrence of malignant accidents. The use of a temperature and humidity recorder will simplify the work of recording temperature and humidity, and will also save the cost of keeping cultural artifacts. This will make this work scientific and will not be disturbed by excessive human factors. At the same time, due to the use of tiny probes such as the NTC, which guarantees minimal damage to the artwork, artifacts, including their color and shape, are not destroyed.
Building Materials Experiment: In the drying process of building materials, especially concrete, we should pay attention to its drying tendency. This is one of the indicators for evaluating products, and it also provides reliable data for construction workers. The application of a temperature and humidity recorder can record this data and provide it to the building materials researcher, which will provide useful help for the construction. Especially in military buildings, time is life. Accurately grasping the concrete drying time is the starting enemy and provides guarantees for effectively providing living forces to the battlefield. This function can be completed by ZDR-20.
The application of agriculture and animal husbandry: Agriculture and animal husbandry production, especially the production of some economic crops, should record the temperature and humidity values ​​in detail at the seedling stage. In agricultural applications, due to the harsh environment—fertilizer, excrement, and other acidic and alkaline environments make the humidity product drift more than other environments. This requires less humidity sensitive capacitance drift and easy calibration of the whole machine. At present, ZDR-20 is used for agricultural research in famous universities such as Zhejiang University, Shandong Agricultural University, and Northwest Agriculture and Forestry University, and it is reflected very well.
Climate records: The ZDR-20 temperature and temperature recorder is of great significance for agricultural and meteorological analysis.
Building acceptance: mainly reflected in the acceptance of smart buildings. Due to the large number of inspection and acceptance projects in the construction industry, in addition to 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 have rushed into these sites and recorded them for a long period of time. They are irresponsible for the personal health of the testers, and the use of a recorder will ensure that the test is performed while obtaining reliable data. The personal safety of personnel provides maximum protection.
Important medical facilities: In accordance with the requirements of the Consultation Draft for the Technical Specifications 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 to both the operator and the patient. When the room temperature exceeds 28°C and the humidity is more than 70% RH, it is prone to reactions such as stuffy heat, sweating, irritability, fatigue, etc., easily affecting the stable mood and agile thinking, so that the operator's skill level can not be well played. At the same time, the patient will also experience rapid heart rate, sweating and other symptoms and increase the difficulty of surgery; when the room temperature is lower than 20 degrees, the operator wearing only the surgical gown will feel cold, and it will easily affect the sensitivity and accuracy of the operation, especially The subtle movements of the fingers. Bare patients suffer from flu and other complications due to traumatic body resistance at a low level. The humidity in the room is low, and the dust on the surface of the object floats in the air due to some movements, such as shop sheets, opening and closing doors, etc. The temperature difference between the inside and the outside of the operation room is large. After the door is opened, the air in some areas forms a vortex flow, and the wind speed increases to about 4 times the original wind speed of the surgery room. At this time, the attachments on the surface of the object rapidly float in the air. According to a survey conducted by the United States CDC, the number of planktonic bacteria in the air in the operating room is at risk of airborne infection at 700-800 cfu/m3. From the results, it can be seen that the air pollution was the most serious at the time of surgery from the shop to the shop, and it was at the surgical stage. Due to gravity, dust in the room can directly sink to the surgical wound or the operator's hands or surgical instruments. Therefore, it is important to strengthen the control of air pollution during this period to prevent postoperative wound infection. These require the health and epidemic prevention departments to confirm the compliance status of the operating rooms in each hospital through their own monitoring. The recorder is a good method, reducing the waste of personnel and ensuring the fairness of law enforcement.
Maintenance of the pipeline: The moisture in the pipeline promotes the growth of microorganisms. Molding on the pipeline is thus formed. This will not only affect the flow of air, it will also breed a large number of bacteria. These contaminated areas pose a threat to health and eventually lead to deterioration of indoor air quality (IAQ, Indoor Air Quality).
The temperature and humidity recorder measures the temperature and humidity parameters and stores them in the internal memory at predetermined time intervals. After the recording function is completed, it is connected to the PC, and the stored data is presented and pressed according to the value by the adaptation software. , time for analysis of the instrument. The instrument can be used to determine that any events that endanger the safety of the product during the storage and transportation process, the experimental process, and other related processes.
The following uses the ZDR-20 type temperature and humidity recorder produced by Hangzhou Zeda Instrument Co., Ltd. as an example to introduce the principle and application of the temperature and humidity recorder:
Principle: The temperature and humidity recorder consists of three parts: measurement part, instrument body, and PC interface.
The following sections introduce these three parts:
Measurement part: temperature sensor and humidity sensor.
Temperature sensor: ZDR-20 series temperature probe consists of NTC and pt1000 series. Different probes perform different functions:
NTC Universal Probes: Used for general purpose measurements, including room, laboratory, container space, etc., with an accuracy of ±0.5°C, size: 5mm in diameter, 25mm in length.
Pt1000-1 temperature sensor high temperature probe, up to 300 °C. For high temperature environments.
Pt1000-2 type high-precision temperature sensor probe, the highest accuracy can reach ± ​​0.2 °C, used in laboratories and other places requiring high precision. The size is 3mm in diameter and 30mm in length.
The above temperature probes can be combined according to user requirements to complete different functions. )
Humidity sensor: ZDR-20 series humidity probes are all imported Honeywell humidity sensors from the United States. The accuracy is ±3%, even ±2%, and the measurement range is from 0 to 100% RH. The size is 7-13mm in diameter and 17mm in length.
(All the above temperature and humidity probes can be built-in or externally for customers with different needs)
Instrument body: ZDR-20 recorder, measured by the probe, the data stored and transmitted to the PC, the storage capacity of 9890 sets of data (temperature, humidity, each 9890 points), recording interval of 2S to 24h continuously adjustable: from PC software adjustment, according to its set value to determine the recording time up to 26 years.
The operating temperature of the recorder is limited by the battery, ie lithium batteries: -20 to 100 °C; alkaline batteries: -10 to 50 °C.
Range and accuracy are determined by the probe, range: up to -40 to 300 °C, 0 to 100% RH;
Accuracy: ± 2% RH ~ ± 3% RH, ± 0.2 °C ~ ± 0.5 °C;
Protection: sealed and waterproof.
Instrument size: 58mm*72mm*29mm.
PC interface: ZDR software. Software support is an indispensable part of the recorder. Its main functions are: setting the recording interval (any adjustable from 2s to 24h), setting the stop mode, setting the start time, reading the data and displaying the measurement data, history curve, etc. , Provides the printing function, converts the data into the EXCEL or the WORD document form and so on the function, this is an integral part of the data recorder. A good PC software can provide the most extensive support for the recorder, through the host computer support, keyboard and other unnecessary parts to liberate, while providing more resources to use.
typical application:
Food storage and transportation: Because the time of food storage and transportation is not a short-term problem, the relative balance of humidity in food preservation is an important indicator of food safety. Relatively balanced humidity directly affects the growth of colonies. For example: In the range of 95%RH to 91%RH, the number of colonies that can easily grow is Salmonella, Pollinella, Lactobacillus, Mold, and Yeast. The food preservation cycle is also related to temperature and equilibrium relative humidity. The cake with a relative humidity of 81%RH has a shelf life of 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 hygroscopic substances plays a decisive role. Balanced relative humidity is defined as the value of humidity obtained from the ambient air when the substance is not exchanged with water in the air. This definition is very clear, in order to successfully store and maintain these products, the environmental climate control and packaging must be carefully specified. At the same time, many foods are kept too dry and their taste will deteriorate. To address this situation, it is required to record changes in temperature and humidity in real time to ensure that food safety enters the mouth of consumers.
When long-distance transport or sea freight refrigerated foods, how to prove that the goods have been in the specified temperature and humidity conditions is very important when receiving. The solution to the controversy is to place a recorder in the cargo compartment and start it at the time of shipment. The temperature and humidity recorder has a precise internal clock that faithfully records the temperature and humidity data for a specified time interval and can be easily retrieved when removed. Use the computer to view the graphic file and the alarm value to determine whether it exceeds the allowable value, when and when the duration can be easily obtained, and whether the carrier’s responsibility is immediately known. At present, Shanghai's famous foreign-invested enterprises Haagen-Dazs and Hangzhou KFC Foods Co., Ltd. have found a powerful way to scientifically manage refrigerated transportation through the use of our products.
Museum heritage, archives management: This is another major area of ​​application of temperature and humidity products, and the recorder is also a very unique product. The paper in the archive can be stored for some time under conditions of suitable temperature and humidity, and once the temperature and humidity conditions are destroyed, the paper will become brittle, and important data will also disappear. It is necessary to record temperature and humidity in the archives. Prevent the occurrence of malignant accidents. The use of a temperature and humidity recorder will simplify the work of recording temperature and humidity, and will also save the cost of keeping cultural artifacts. This will make this work scientific and will not be disturbed by excessive human factors. At the same time, due to the use of tiny probes such as the NTC, which guarantees minimal damage to the artwork, artifacts, including their color and shape, are not destroyed.
Building Materials Experiment: In the drying process of building materials, especially concrete, we should pay attention to its drying tendency. This is one of the indicators for evaluating products, and it also provides reliable data for construction workers. The application of a temperature and humidity recorder can record this data and provide it to the building materials researcher, which will provide useful help for the construction. Especially in military buildings, time is life. Accurately grasping the concrete drying time is the starting enemy and provides guarantees for effectively providing living forces to the battlefield. This function can be completed by ZDR-20.
The application of agriculture and animal husbandry: Agriculture and animal husbandry production, especially the production of some economic crops, should record the temperature and humidity values ​​in detail at the seedling stage. In agricultural applications, due to the harsh environment—fertilizer, excrement, and other acidic and alkaline environments make the humidity product drift more than other environments. This requires less humidity sensitive capacitance drift and easy calibration of the whole machine. At present, ZDR-20 is used for agricultural research in famous universities such as Zhejiang University, Shandong Agricultural University, and Northwest Agriculture and Forestry University, and it is reflected very well.
Climate records: The ZDR-20 temperature and temperature recorder is of great significance for agricultural and meteorological analysis.
Building acceptance: mainly reflected in the acceptance of smart buildings. Due to the large number of inspection and acceptance projects in the construction industry, in addition to 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 have rushed into these sites and recorded them for a long period of time. They are irresponsible for the personal health of the testers, and the use of a recorder will ensure that the test is performed while obtaining reliable data. The personal safety of personnel provides maximum protection.
Important medical facilities: In accordance with the requirements of the Consultation Draft for the Technical Specifications 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 to both the operator and the patient. When the room temperature exceeds 28°C and the humidity is more than 70% RH, it is prone to reactions such as stuffy heat, sweating, irritability, fatigue, etc., easily affecting the stable mood and agile thinking, so that the operator's skill level can not be well played. At the same time, the patient will also experience rapid heart rate, sweating and other symptoms and increase the difficulty of surgery; when the room temperature is lower than 20 degrees, the operator wearing only the surgical gown will feel cold, and it will easily affect the sensitivity and accuracy of the operation, especially The subtle movements of the fingers. Bare patients suffer from flu and other complications due to traumatic body resistance at a low level. The humidity in the room is low, and the dust on the surface of the object floats in the air due to some movements, such as shop sheets, opening and closing doors, etc. The temperature difference between the inside and the outside of the operation room is large. After the door is opened, the air in some areas forms a vortex flow, and the wind speed increases to about 4 times the original wind speed of the surgery room. At this time, the attachments on the surface of the object rapidly float in the air. According to a survey conducted by the United States CDC, the number of planktonic bacteria in the air in the operating room is at risk of airborne infection at 700-800 cfu/m3. From the results, it can be seen that the air pollution was the most serious at the time of surgery from the shop to the shop, and it was at the surgical stage. Due to gravity, dust in the room can directly sink to the surgical wound or the operator's hands or surgical instruments. Therefore, it is important to strengthen the control of air pollution during this period to prevent postoperative wound infection. These require the health and epidemic prevention departments to confirm the compliance status of the operating rooms in each hospital through their own monitoring. The recorder is a good method, reducing the waste of personnel and ensuring the fairness of law enforcement.
Maintenance of the pipeline: The moisture in the pipeline promotes the growth of microorganisms. Molding on the pipeline is thus formed. This will not only affect the flow of air, it will also breed a large number of bacteria. These contaminated areas pose a threat to health and eventually lead to deterioration of indoor air quality (IAQ, Indoor Air Quality).