Dry and wet bulb temperature and humidity inspection recorder

Abstract

The utility model relates to the field of temperature and humidity measuring equipment, and particularly discloses a dry and wet bulb temperature and humidity inspection recorder, which comprises even number of temperature sensors, a multi-channel temperature acquisition instrument, a touch control screen and a communication module, the multi-channel temperature acquisition instrument comprises a plurality of acquisition channels, and each temperature sensor is connected with the plurality of acquisition channels of the multi-channel temperature acquisition instrument through a spaceflight plug; the communication module transmits processing data of the multi-channel temperature acquisition instrument to the touch controller, and the touch control screen records the data acquired by the multi-channel temperature acquisition instrument and calculates temperature and humidity parameters according to a set program. The utility model solves the problems that the conventional recorder does not have the function of measuring the relative humidity by using the temperature of a dry-wet bulb, and the precision and the stability are not favorably maintained in the standard detection in a complex environment when the humidity is measured by using a capacitive humidity sensor.

Description

Technical Field

[0001] This utility model relates to the field of temperature and humidity measurement equipment, specifically to a dry and wet bulb temperature and humidity inspection recorder. Background Technology

[0002] During the production of environmental test chambers, factories need to debug the equipment and test and measure its temperature and humidity fields to verify whether the equipment meets national standards for environmental chamber fluctuations, temperature and humidity deviations, and uniformity. Existing recorders do not utilize wet-bulb and dry-bulb temperatures to measure relative humidity; they can only use capacitive humidity sensors. However, pre-shipment verification testing of environmental test chambers often involves extreme temperature and humidity data, as well as complex extreme test scenarios such as temperature fluctuations, contamination, and aging. Traditional capacitive humidity sensors operate on the principle that the dielectric constant of hygroscopic materials changes with temperature and humidity, making them highly susceptible to the influence of such complex application scenarios, which is detrimental to maintaining their accuracy and stability. Summary of the Invention

[0003] The purpose of this invention is to provide a wet-bulb and dry-bulb temperature and humidity monitoring recorder, which aims to intelligently detect temperature data in an environmental test chamber using the wet-bulb and dry-bulb method, thereby improving the accuracy, stability, and efficiency of environmental parameter detection in the environmental test chamber.

[0004] To address the aforementioned technical problems, this invention provides a dry-bulb and wet-bulb temperature and humidity monitoring recorder, comprising a pair of temperature sensors, a multi-channel temperature acquisition unit, a touch control screen, and a communication module. The temperature sensors are 4-wire PT100 sensors, configured as a pair of dry-bulb and wet-bulb temperature sensors. The multi-channel temperature acquisition unit includes multiple acquisition channels, with each temperature sensor connected to one of the acquisition channels via an aerospace connector. The communication module transmits the processed data from the multi-channel temperature acquisition unit to the touch controller. The touch control screen records the data acquired from the multi-channel temperature acquisition unit, calculates the relative humidity according to a set program, and displays the test results.

[0005] Preferably, the PT100 sensor is a Class A precision sensor.

[0006] Preferably, the temperature sensors are configured to have 24 units.

[0007] Preferably, the wet-bulb temperature sensor includes a PT100 sensor, which includes a temperature-sensing part. One end of the temperature-sensing part is wrapped with cotton gauze, and the other end of the cotton gauze is immersed in a water storage tank. The water storage tank is provided with a water source to keep the temperature-sensing part moist.

[0008] Preferably, the aerospace plug includes a male end and a female end that are connected to each other. The male end is connected to the temperature sensor assembly, and the female end is connected to the multi-channel acquisition channel of the multi-channel temperature acquisition instrument.

[0009] Compared with related technologies, the dry and wet bulb temperature and humidity monitoring recorder provided by this invention has the following advantages:

[0010] The technical solution of this wet and dry bulb temperature and humidity monitoring recorder demonstrates excellent technical performance in addressing the problem that traditional capacitive humidity sensors are difficult to guarantee in terms of accuracy and stability due to complex application scenarios in environmental test chamber calibration testing.

[0011] This invention employs a 4-wire PT100 sensor to form a temperature sensor array with an even number of wires. This array is then configured with paired dry-bulb and wet-bulb temperature sensors to construct a dry-bulb and wet-bulb temperature measurement system. Combined with a multi-channel temperature acquisition unit, precision aerospace connectors, a touch control screen, and a communication module, a highly integrated and collaborative temperature and humidity monitoring system is formed. During the commissioning and testing of the environmental test chamber, the PT100 sensor, with its high accuracy and stability, precisely acquires dry-bulb and wet-bulb temperature data, providing a solid foundation for subsequent humidity calculations. The multi-channel acquisition function of the multi-channel temperature acquisition unit, in conjunction with other components, greatly improves the efficiency and comprehensiveness of data acquisition, enabling simultaneous monitoring of temperature and humidity at multiple key locations and timely capture of subtle changes in the temperature and humidity field within the environmental chamber. This invention effectively avoids measurement errors caused by capacitive humidity sensors due to extreme temperature and humidity, temperature fluctuations, contamination, aging, and other factors. By utilizing the wet-bulb and dry-bulb humidity calculation principle, relative humidity can be accurately determined even in complex test scenarios, ensuring the accuracy and reliability of temperature and humidity measurements. This allows the measurement results of parameters such as environmental chamber fluctuation, temperature and humidity deviation, and uniformity to truly reflect the equipment performance, improving the accuracy, stability, and efficiency of environmental parameter detection in the environmental test chamber and meeting national standard requirements. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a wet and dry bulb temperature and humidity monitoring recorder as an example.

[0013] Figure 2 This embodiment presents a schematic block diagram of a dry-bulb and wet-bulb temperature and humidity inspection recorder.

[0014] Numbering on the map:

[0015] 1. PT100 temperature sensor, 101. Wet-bulb temperature sensor, 103. Temperature sensing element, 102. Cotton gauze, 104. Water tank, 3. Temperature acquisition instrument, 4. Touch control screen. Detailed Implementation

[0016] The dry and wet bulb temperature and humidity monitoring recorder of this utility model will be further described below with reference to the accompanying drawings and embodiments, but this is not intended to limit the technical solutions involved in this utility model.

[0017] Example 1

[0018] like Figures 1 to 2 As shown, this embodiment provides a dry-bulb and wet-bulb temperature and humidity monitoring recorder. To achieve dry-bulb and wet-bulb temperature and humidity measurement, an integrated dry-bulb and wet-bulb thermometer assembly is adopted. Each assembly includes two PT100 temperature sensors 1 with Class A accuracy, one for dry-bulb temperature measurement and one for wet-bulb temperature measurement. There are 12 such assemblies, totaling 24 PT100 temperature sensors 1. The wet-bulb temperature sensor 101 for wet-bulb temperature measurement includes a PT100 temperature sensor 1 body and a temperature-sensing part 103. One end of the temperature-sensing part is wrapped with cotton gauze 102, and the other end of the cotton gauze 102 is immersed in a water storage tank 104. The water storage tank 104 is fixed to the sensor mounting bracket inside the environmental test chamber when it is installed, facilitating flexible disassembly and relocation. A water source is provided in the water storage tank 104 to keep the temperature-sensing part moist. Each dry-bulb and wet-bulb thermometer assembly is fixed in the same area inside the environmental test chamber. The sensor connects to the multi-channel temperature acquisition unit 3 via aerospace connector 2. Aerospace connector 2 has both male and female connectors. The PT100 temperature sensor 1 is connected via a male connector, while the multi-channel temperature acquisition unit has a corresponding female connector. A specific plug-and-play structure enables quick connection, facilitating the disassembly and installation of the PT100 temperature sensor 1. Each PT100 temperature sensor 1 corresponds to an independent channel. In the 24-channel temperature acquisition unit, the interface of each channel can be precisely matched to the male portion of the aerospace connector 2 of a PT100 temperature sensor 1, ensuring stable signal transmission.

[0019] A PT100 temperature data acquisition unit with 24 or more channels is selected. It has an internal data reading module responsible for reading data from the temperature sensor. This acquisition unit has a communication module using the RS485 communication protocol, connecting to the touch control screen via a standard 4-core communication cable. One end of the communication cable is a crystal plug, which inserts into the RS485 communication interface of the temperature data acquisition unit. This interface has specific pin definitions, such as A, B, GND, VCC, etc., corresponding to the corresponding wires in the crystal plug. The other end is also a crystal plug, connecting to the RS485 communication interface of the touch control screen 4. The interface definition matches the acquisition unit, thus achieving stable data transmission. The touch control screen 4 has a built-in data processing unit and a storage unit. The data processing unit processes the data acquired from the temperature data acquisition unit, including calculating relative humidity based on dry and wet bulb temperatures, and calculating and displaying test results. The storage unit stores the acquired data, calculation results, and system settings parameters.

[0020] This embodiment employs a combination of a 4-wire PT100 temperature sensor and a wet-bulb / dry-bulb humidity measurement system. The high-precision temperature sensing capability of the PT100 sensor provides a precise foundation of dry-bulb and wet-bulb temperature data for humidity measurement. This combined measurement method overcomes the problem of traditional capacitive humidity sensors being susceptible to accuracy issues under extreme temperature and humidity conditions and complex testing scenarios. Overall, it significantly improves the accuracy and stability of temperature and humidity measurements, ensuring the accuracy of parameters such as temperature and humidity deviation, fluctuation, and uniformity measurements within the environmental test chamber, meeting the stringent requirements of national standards. The multi-channel temperature acquisition unit, along with the touch control screen and communication module, works collaboratively to achieve a highly efficient and automated data acquisition and processing workflow, reducing labor costs. The aerospace-grade connector ensures stable data transmission between the sensor and the acquisition unit. The stability and anti-interference capabilities of the PT100 sensor and the wet-bulb / dry-bulb measurement method guarantee reliable operation of the measurement process. The combined effect of all components enables the entire recording system to accurately measure temperature data within the environmental test chamber under extreme conditions, improving the accuracy, stability, and efficiency of environmental parameter detection.

[0021] The method of using this embodiment in environmental test chamber testing is as follows:

[0022] Twelve sets of wet and dry bulb sensor assemblies were installed inside the environmental test chamber using stainless steel L-shaped brackets. The horizontal portion of the bracket secured the sensor assemblies with clamps and screws with an inner diameter of 1.1 cm. The vertical portion was bolted to the inner wall of the test chamber every 10 cm, with four sensor assemblies evenly distributed at heights of 0.5 m, 1 m, and 1.5 m from the bottom on each layer. Aerospace plugs 2, connecting wires from the sensor assemblies, were routed along the bracket's cable channels, secured with plastic clips, and led out through pre-drilled holes in the test chamber to connect to an external multi-channel temperature acquisition instrument 3.

[0023] Place the multi-channel temperature acquisition device 3 (a 24-channel PT100 temperature acquisition device is selected here) in a suitable location. Connect its RS485 communication interface to the RS485 communication interface of the touch control screen via a standard 4-core communication cable (with a crystal plug) to ensure normal communication. Install the touch control screen 4 in an easily accessible location. Ensure that its internal microprocessor, display driver circuit, touch screen controller, memory chip, USB interface controller, and other hardware are functioning properly and connected correctly.

[0024] After starting the device, the sampling channel setting interface is accessed on the touch control screen 4. The user clicks the channel button on the touchscreen, and the touchscreen controller transmits the touch signal to the microprocessor. The microprocessor recognizes the operation according to a preset program, generates control commands (including channel number and switch status), and sends them to the multi-channel temperature data acquisition unit via the RS485 communication module. The control logic circuit of the multi-channel temperature data acquisition unit parses the commands and controls the corresponding channel's electronic switch to turn on or off, thus opening or closing the channel. Simultaneously, the microprocessor updates the display information on the touch control screen based on the channel status. When selecting a channel type, the user selects dry-bulb or wet-bulb temperature on the interface. The microprocessor stores the selection information and sends it to the multi-channel temperature data acquisition unit for associated recording. If wet-bulb temperature is selected, the user inputs the corresponding dry-bulb temperature point, and the microprocessor similarly stores and sends this information. In the acquisition setting interface, the user inputs parameters such as the device project number, set temperature, set humidity, number of samples, and sampling interval via the touchscreen. The key scanning circuit or analog-to-digital converter converts the user's operation into a digital signal and sends it to the microprocessor. The microprocessor stores the parameters and sends them to the multi-channel temperature data acquisition unit via the RS485 communication module. The control logic circuit of the multi-channel temperature data logger receives parameters and writes them into the parameter storage unit. When the user clicks the sampling button, the microprocessor sends a sampling start command, and the multi-channel temperature data logger starts the temperature sensor sampling according to the sampling settings.

[0025] After sampling is complete, the user clicks the measurement report button on the touch control screen, and the touch screen controller transmits a signal to the microprocessor. The microprocessor reads the sampling data, calculation results (temperature fluctuation, uniformity, deviation data, humidity deviation data, etc.), equipment project number, test time, and raw data from the storage chip. After the microprocessor converts and organizes the data, it displays the measurement report content on the screen through the display driver circuit, including numerical displays of various data points and graphical representations of temperature and humidity points.

[0026] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A dry-bulb and wet-bulb temperature and humidity monitoring recorder, characterized in that: The device includes temperature sensors arranged in pairs, a multi-channel temperature acquisition unit, a touch control screen, and a communication module. The temperature sensors are 4-wire PT100 sensors, configured as a pair of dry-bulb and wet-bulb temperature sensors. The multi-channel temperature acquisition unit includes multiple acquisition channels, and each of the temperature sensors is connected to the multiple acquisition channels of the multi-channel temperature acquisition unit via an aerospace connector. The communication module transmits the processed data from the multi-channel temperature acquisition instrument to the touch controller. The touch control screen records the data collected from the multi-channel temperature acquisition instrument, calculates the relative humidity according to the set program, and displays the test results.

2. The dry-bulb and wet-bulb temperature and humidity monitoring recorder according to claim 1, characterized in that: The PT100 sensor is a Class A precision sensor.

3. The dry-bulb and wet-bulb temperature and humidity monitoring recorder according to claim 1, characterized in that: The temperature sensors are configured to have 24 units.

4. The dry-bulb and wet-bulb temperature and humidity monitoring recorder according to claim 1, characterized in that: The wet-bulb temperature sensor includes a PT100 sensor, which includes a temperature-sensing part. One end of the temperature-sensing part is wrapped with cotton gauze, and the other end of the cotton gauze is immersed in a water storage tank. The water storage tank is equipped with a water source to keep the temperature-sensing part moist.

5. The dry-bulb and wet-bulb temperature and humidity monitoring recorder according to claim 1, characterized in that: The aerospace plug includes a male connector and a female connector that are connected to each other. The male connector is connected to the temperature sensor, and the female connector is connected to the multi-channel acquisition channel of the multi-channel temperature acquisition instrument.

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