Temperature and humidity measurement is a new field of modern measurement, especially the measurement of humidity is constantly moving forward. The process of length measurement, dry-wet method and today's electrical measurement has made the humidity measurement technology mature. Today, because we are no longer satisfied with the measurement of temperature and humidity, especially the monitoring of some places directly requires real-time recording of the whole process temperature and humidity changes, and based on these changes to determine the safety of the storage process, 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 completing the recording function, it is connected to the PC, and the stored data is presented and valued by the adaptation software. Time, the instrument for analysis. The instrument can be used to determine that the storage process, the experimental process and other related processes do not have any events that endanger the safety of the product.
The ZDR-20 temperature and humidity recorder produced by Zhejiang University Electric Equipment Factory is taken as an example to introduce the principle and application of temperature and humidity recorder:
Principle: The temperature and humidity recorder consists of three parts: the measuring part, the instrument body, and the PC interface.
The following three parts are introduced separately:
Measuring part: temperature sensor and humidity sensor.
Temperature Sensor: The ZDR-20 series temperature probe consists of NTC and pt1000 series. Different probes perform different functions:
NTC universal probe: used for general measurement, including space measurement in workshop, laboratory, container space, etc., its accuracy is ±0.5 °C, the size is: diameter 5mm, length 25mm.
Pt1000-1 temperature sensor high temperature probe, Zui high up to 300 °C. Used in high temperature environments.
Pt1000-2 temperature sensor high-precision probe, Zui high-precision can reach ± ​​0.2 ° C, used in laboratory and other high precision requirements. 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 from the United States Honeywell humidity sensor with an accuracy of ±3%, even up to ±2%, and the measurement range is 0-100% RH. The size is: 7 to 13 mm in diameter and 17 mm in length.
(All of the above temperature and humidity probes can be selected for internal or external use, for customers with different needs)
Instrument body: ZDR-20 type recorder, measuring by probe, storing and transmitting data to PC, its storage capacity is 9890 sets of data (temperature and humidity are 9890 points), and the recording interval is continuously adjustable from 2S to 24h: PC software adjustment, according to its set value to determine the recording time zui for more than 26 years. The operating temperature of the recorder is limited by the battery, that is, lithium battery: -20 to 100 ° C; alkaline battery: -10 to 50 ° C. The range and accuracy are determined by the probe. The range: up to -40 to 300 ° C, 0 to 100% RH; accuracy: ± 2% RH ~ ± 3% RH, ± 0.2 ° C ~ ± 0.5 ° C; protection: sealed, 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 startup time, reading the data and displaying the measurement data, history curve, etc. Provides printing functions, converts data into EXCEL or WORD document forms, etc. This is an integral part of the data logger. A good PC software can provide extensive support for the recorder zui, through the support of the host computer, the keyboard and other unnecessary parts are liberated, while providing more resources to utilize.
typical application:
Food storage and transportation: Because the food storage and transportation process time 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 chilled 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 view 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. At present, Shanghai famous foreign-funded enterprises Haagen-Dazs and Hangzhou KFC Foods Co., Ltd. have found a powerful way to scientifically manage refrigerated transportation by using our products.
Museum artifacts, file management: This is another big area of ​​application of temperature and humidity products, and the recorder is a very distinctive product. The paper of the file can be stored for a long time under the conditions of suitable temperature and humidity. 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 of the archives. Prevent the occurrence of a malignant accident. The use of a temperature and humidity recorder 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. At the same time, due to the use of tiny probes such as NTC, the cultural relics, including their color and shape, are not damaged under the premise of small damage to the artwork.
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. This function can be completed by ZDR-20.
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 during the seedling period. In agricultural applications, the acid-alkaline environment caused by harsh environments—fertilizers, feces, etc., causes humidity products to drift beyond other environments. This requires less humidity-sensitive capacitor drift and easier calibration. At present, Zhejiang University, Shandong Agricultural University, Northwest A&F University and other famous universities have used ZDR-20 for agricultural research, and the response is very good.
Climate record: ZDR-20 temperature and temperature recorder has a prominent significance for agricultural and meteorological analysis.
Building acceptance: mainly reflected in the 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 personal health of the testers, and the application recorder will ensure that the test is obtained while obtaining reliable data. The personal safety of the personnel is protected by Zui.
Important medical and health care places: According to the requirements of the "Consultation Draft for the Construction 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 for both the operator and the patient. When the room temperature exceeds 28 ° C and the humidity is greater than 70% RH, it is easy to have sultry, sweating, irritability, fatigue and other reactions, which easily affects the stable mood and agile thinking, so that the skill level of the operator can not be well played. At the same time, the patient may have symptoms such as rapid heart rate and sweating, which increases the difficulty of operation; 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 surface dust on the surface of the object is suspended in the air with some movements such as laying a sheet, 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 door is opened 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 serious 2 hours after the operation to the site, and this 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 to reduce the waste of personnel and ensure the fairness of law enforcement.
Pipeline maintenance: Moisture in the pipe promotes microbial growth, and mold on the pipe is formed. This not only affects air flow, but also breeds a lot of bacteria. These contaminated areas pose a threat to health and eventually lead to a deterioration in indoor air quality (IAQ).
The temperature and humidity recorder measures the temperature and humidity parameters and stores them in the internal memory at predetermined time intervals. After completing the recording function, it is connected to the PC, and the stored data is presented and valued by the adaptation software. Time, the instrument for analysis. The instrument can be used to determine that the storage process, the experimental process and other related processes do not have any events that endanger the safety of the product.
The ZDR-20 temperature and humidity recorder produced by Zhejiang University Electric Equipment Factory is taken as an example to introduce the principle and application of temperature and humidity recorder:
Principle: The temperature and humidity recorder consists of three parts: the measuring part, the instrument body, and the PC interface.
The following three parts are introduced separately:
Measuring part: temperature sensor and humidity sensor.
Temperature Sensor: The ZDR-20 series temperature probe consists of NTC and pt1000 series. Different probes perform different functions:
NTC universal probe: used for general measurement, including space measurement in workshop, laboratory, container space, etc., its accuracy is ±0.5 °C, the size is: diameter 5mm, length 25mm.
Pt1000-1 temperature sensor high temperature probe, Zui high up to 300 °C. Used in high temperature environments.
Pt1000-2 temperature sensor high-precision probe, Zui high-precision can reach ± ​​0.2 ° C, used in laboratory and other high precision requirements. 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 from the United States Honeywell humidity sensor with an accuracy of ±3%, even up to ±2%, and the measurement range is 0-100% RH. The size is: 7 to 13 mm in diameter and 17 mm in length.
(All of the above temperature and humidity probes can be selected for internal or external use, for customers with different needs)
Instrument body: ZDR-20 type recorder, measuring by probe, storing and transmitting data to PC, its storage capacity is 9890 sets of data (temperature and humidity are 9890 points), and the recording interval is continuously adjustable from 2S to 24h: PC software adjustment, according to its set value to determine the recording time zui for more than 26 years. The operating temperature of the recorder is limited by the battery, that is, lithium battery: -20 to 100 ° C; alkaline battery: -10 to 50 ° C. The range and accuracy are determined by the probe. The range: up to -40 to 300 ° C, 0 to 100% RH; accuracy: ± 2% RH ~ ± 3% RH, ± 0.2 ° C ~ ± 0.5 ° C; protection: sealed, 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 startup time, reading the data and displaying the measurement data, history curve, etc. Provides printing functions, converts data into EXCEL or WORD document forms, etc. This is an integral part of the data logger. A good PC software can provide extensive support for the recorder zui, through the support of the host computer, the keyboard and other unnecessary parts are liberated, while providing more resources to utilize.
typical application:
Food storage and transportation: Because the food storage and transportation process time 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 chilled 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 view 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. At present, Shanghai famous foreign-funded enterprises Haagen-Dazs and Hangzhou KFC Foods Co., Ltd. have found a powerful way to scientifically manage refrigerated transportation by using our products.
Museum artifacts, file management: This is another big area of ​​application of temperature and humidity products, and the recorder is a very distinctive product. The paper of the file can be stored for a long time under the conditions of suitable temperature and humidity. 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 of the archives. Prevent the occurrence of a malignant accident. The use of a temperature and humidity recorder 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. At the same time, due to the use of tiny probes such as NTC, the cultural relics, including their color and shape, are not damaged under the premise of small damage to the artwork.
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. This function can be completed by ZDR-20.
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 during the seedling period. In agricultural applications, the acid-alkaline environment caused by harsh environments—fertilizers, feces, etc., causes humidity products to drift beyond other environments. This requires less humidity-sensitive capacitor drift and easier calibration. At present, Zhejiang University, Shandong Agricultural University, Northwest A&F University and other famous universities have used ZDR-20 for agricultural research, and the response is very good.
Climate record: ZDR-20 temperature and temperature recorder has a prominent significance for agricultural and meteorological analysis.
Building acceptance: mainly reflected in the 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 personal health of the testers, and the application recorder will ensure that the test is obtained while obtaining reliable data. The personal safety of the personnel is protected by Zui.
Important medical and health care places: According to the requirements of the "Consultation Draft for the Construction 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 for both the operator and the patient. When the room temperature exceeds 28 ° C and the humidity is greater than 70% RH, it is easy to have sultry, sweating, irritability, fatigue and other reactions, which easily affects the stable mood and agile thinking, so that the skill level of the operator can not be well played. At the same time, the patient may have symptoms such as rapid heart rate and sweating, which increases the difficulty of operation; 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 surface dust on the surface of the object is suspended in the air with some movements such as laying a sheet, 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 door is opened 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 serious 2 hours after the operation to the site, and this 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 to reduce the waste of personnel and ensure the fairness of law enforcement.
Pipeline maintenance: Moisture in the pipe promotes microbial growth, and mold on the pipe is formed. This not only affects air flow, but also breeds a lot of bacteria. These contaminated areas pose a threat to health and eventually lead to a deterioration in indoor air quality (IAQ).
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