Combined sensor for providing temperature and relative humidity in environmental monitoring

Abstract

The utility model belongs to the technical field of environmental monitoring, and particularly discloses a combined sensor for providing temperature and relative humidity in environmental monitoring, which comprises a shell. The head of the shell is detachably connected with a protective upper cover, a measuring circuit board is arranged in the shell and sealed in the shell through colloid, a socket is arranged at the end, located at the head of the shell, of the measuring circuit board, a temperature element and a humidity element are inserted into the surface of the socket, and a cable is arranged at the position, located at the tail end of the shell, of the measuring circuit board. One end of the cable is connected with the measuring circuit board and the plug, the other end of the cable is connected with an SDI-12 interface of the data recorder, the plug is arranged at the tail part of the shell, and the plug is detachably connected with the tail part of the shell; according to the utility model, the measuring circuit board is sealed in the shell in a colloid encapsulation manner, the corrosion of the measuring circuit board caused by the use environment is avoided, the humidity element and the temperature element are inserted on the circuit board, and only the temperature element and the humidity element need to be replaced when the humidity element and the temperature element need to be replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental monitoring, in particular to a combined sensor that provides temperature and relative humidity in environmental monitoring. Background Art

[0002] Temperature and humidity sensors are commonly used monitoring devices in meteorological and environmental systems. They can be divided into analog and digital types according to their working mode. The analog type requires the user to design a measurement circuit to detect the analog voltage or analog current of the temperature and humidity element, and then output it in the agreed analog signal form after conversion, calibration and calibration. The digital type directly uses the temperature and humidity element with a digital interface that has been calibrated at the factory, and outputs it in the agreed digital interface mode after reading the data with the MCU. The existing temperature and humidity sensors need to be replaced regularly as a whole because the temperature and humidity elements are welded on the circuit board. When they are damaged by dirt, dust, salt or other pollutants. The data output of existing digital temperature sensors is mostly 485 or 232 interfaces, which require more wiring harnesses for transmission and communication. Utility Model Content

[0003] The purpose of the utility model is to provide a combined sensor for temperature and relative humidity in environmental monitoring to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a combined sensor for temperature and relative humidity in environmental monitoring, comprising a shell; a protective upper cover is detachably connected to the head of the shell, a measuring circuit board is arranged inside the shell, and the measuring circuit board is sealed inside the shell by colloid sealing, a socket is arranged at one end of the head of the shell, a temperature element and a humidity element are plugged into the surface of the socket, a cable is arranged at the rear end of the shell, one end of the cable is connected to the measuring circuit board and a plug, and the other end of the cable is connected to the SDI-12 interface of a data recorder, the plug is arranged at the rear of the shell, and the plug is detachably connected to the rear of the shell.

[0005] Preferably, an MCU and an operational amplifier are mounted and fixed on the surface of the measuring circuit board.

[0006] Preferably, the cable and the plug are connected by an injection molding process.

[0007] Preferably, the temperature element adopts a PT1000 temperature sensor, and the humidity element adopts one of HC1000 / HC101 humidity sensors.

[0008] Compared with the prior art, the utility model has the following beneficial effects: the measuring circuit board provided by the utility model is sealed in the housing by means of colloid potting, which avoids the corrosion of the measuring circuit board by the use environment; the humidity element and the temperature element are plugged into the circuit board, and when replacement is needed, only the temperature element and the humidity element need to be replaced. Partial replacement saves 30-50% of the cost. The sensor adopts the SDI-12 interface, and the data interface uses fewer wire harnesses to transmit data. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A cross-sectional view of a combined sensor for providing temperature and relative humidity in environmental monitoring provided by the utility model;

[0010] Figure 2 This is an overall three-dimensional structural diagram of a combined sensor for providing temperature and relative humidity in environmental monitoring provided by the utility model.

[0011] In the figure: 1. Protective cover; 2. Humidity element; 3. Shell; 4. Plug; 5. Temperature element; 6. Measuring circuit board; 7. Cable. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0013] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0014] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0015] See also Figure 1-Figure 2The utility model provides a technical solution: a combined sensor for providing temperature and relative humidity in environmental monitoring, comprising a shell 3; a protective upper cover 1 is detachably connected to the head of the shell 3, and the protective upper cover 1 is threadedly connected to the shell 3; a measuring circuit board 6 is fixedly installed inside the shell 3, and the measuring circuit board 6 is sealed inside the shell 3 by colloid sealing; the measuring circuit board 6 is provided with a socket at one end of the head of the shell 3, and the end of the socket leaks out from the head of the shell 3, and a temperature element 5 and a humidity element 2 are plugged on the surface of the socket; the measuring circuit board 6 is provided with a cable 7 at the rear end of the shell 3, one end of the cable 7 is welded and fixed to the measuring circuit board 6 and is fixedly connected to the plug 4 by injection molding, and the other end of the cable 7 is connected to the SDI-12 interface of the data recorder; the plug 4 is provided at the rear of the shell 3, and the plug 4 is detachably connected to the rear of the shell 3, and the plug 4 is threadedly connected to the rear of the shell 3.

[0016] The measuring circuit board 6 is surface-mounted with an MCU and an operational amplifier, which are used to convert and output the values ​​measured by the temperature element 5 and the humidity element 2;

[0017] The cable 7 and the plug 4 are connected by injection molding, thereby reducing the installation process and solving the sealing problem;

[0018] The model of the temperature element 5 is a PT1000 temperature sensor, and the model of the humidity element 2 is one of the HC1000 / HC101 humidity sensors.

[0019] The protective cover 1 is a polypropylene piece, and a stainless steel mesh dust filter is arranged inside the protective cover 1.

[0020] like Figure 1-Figure 2 As shown, a combined sensor of temperature and relative humidity is provided in an environmental monitoring of the utility model. The combined sensor needs to be used in conjunction with an instrument capable of measuring analog voltage. When the combined sensor is connected to the instrument and powered on, the humidity measurement circuit outputs a pulse group of a certain frequency, and charges and discharges a fixed-value capacitor through the humidity element 2 and the reference capacitor respectively, and calculates the capacitance value of the humidity element 2 through the voltage on the fixed-value capacitor, and then outputs a fixed-frequency square wave with a variable duty cycle corresponding to the capacitance value, which is converted into an analog voltage by the PWM to analog voltage circuit and then output; the temperature measurement circuit outputs a certain voltage to the temperature element 5 loop, and converts the voltage at both ends of the temperature element 5 into a square wave with a variable frequency through a triangular wave generating circuit, calculates the frequency of the square wave, and then outputs a fixed-frequency square wave with a variable duty cycle corresponding to the frequency value, which is converted into an analog voltage by the PWM to analog voltage circuit and then output;

[0021] The operating voltage of the combined sensor is 7V-32V, the average operating current is less than 1.2mA, the measurement range of humidity is 0%-100% relative humidity, and the full-scale accuracy is within ±(1.5+0.015*relative humidity reading)%. The measurement range of temperature is -40℃-60℃, and the full-scale accuracy is ±0.2℃. The output of the combined sensor is a digital interface, and the cable length can reach 300m, which will not affect data transmission.

[0022] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined sensor for providing temperature and relative humidity in environmental monitoring, characterized in that: The invention comprises a shell (3); the head of the shell (3) is detachably connected to a protective upper cover (1); a measuring circuit board (6) is arranged inside the shell (3); the measuring circuit board (6) is sealed inside the shell (3) by means of a colloid seal; a socket is arranged at one end of the head of the shell (3); a temperature element (5) and a humidity element (2) are plugged into the surface of the socket; a cable (7) is arranged at the rear end of the shell (3); one end of the cable (7) is connected to the measuring circuit board (6) and a plug (4); the other end of the cable (7) is connected to an SDI-12 interface of a data recorder; the plug (4) is arranged at the rear of the shell (3), and the plug (4) is detachably connected to the rear of the shell (3).

2. The combined sensor for providing temperature and relative humidity in environmental monitoring according to claim 1, characterized in that: The measuring circuit board (6) has an MCU and an operational amplifier mounted and fixed on its surface.

3. The combined sensor for providing temperature and relative humidity in environmental monitoring according to claim 1, characterized in that: The cable (7) and the plug (4) are connected by means of an injection molding process.

4. The combined sensor for providing temperature and relative humidity in environmental monitoring according to claim 1, characterized in that: The temperature element (5) adopts a PT1000 temperature sensor, and the humidity element (2) adopts one of HC1000 / HC101 humidity sensors.

5. The combined sensor for providing temperature and relative humidity in environmental monitoring according to claim 1, characterized in that: The protective upper cover (1) is a polypropylene piece, and a stainless steel mesh dust filter is arranged inside the protective upper cover (1).

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