Split type temperature and humidity sensor for environment detection

Abstract

The utility model discloses a split type temperature and humidity sensor used for environment detection. The split type temperature and humidity sensor comprises a detection unit installed in a clean area air return pipeline, a logic control unit installed in a non-clean area and a display unit independently arranged on the wall face of the clean area. The detection unit comprises an SHT35 temperature and humidity sensor probe, a double-layer filter membrane structure and an air pipe fixing flange; and the logic control unit is physically connected with the detection unit through an aviation plug. According to the split type temperature and humidity sensor used for environment detection, the detection unit is installed in the air return pipeline, and temperature and humidity data are collected in real time; the logic control unit is installed in the non-clean area and used for processing and outputting data; the display unit is installed on the wall of the clean area and visually displays temperature and humidity data. According to the design, equipment in a clean area and equipment in a non-clean area are effectively isolated, the risk of cross contamination is reduced, and meanwhile accurate transmission and display of data are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of industrial environmental monitoring technology, and in particular to a split-type temperature and humidity sensor for environmental monitoring. Background Technology

[0002] Traditional temperature and humidity sensors for clean areas typically employ an integrated structure, with the detection chip directly installed within the clean area. Data is collected and transmitted to a host computer via a built-in module. This approach has the following drawbacks:

[0003] 1. Susceptible to local environmental influences: If heat-generating or moisture-generating equipment is present in the clean area, the sensors are easily interfered with, leading to distorted monitoring data;

[0004] 2. High risk during cleaning operations: During routine cleaning, the sensors may be damaged by water or moisture, affecting detection accuracy and service life;

[0005] 3. Insufficient spatial adaptability: In large clean areas, single-point monitoring is difficult to accurately reflect the overall environmental temperature and humidity, which can easily lead to data deviation. Utility Model Content

[0006] To address the aforementioned shortcomings in existing technologies, this utility model provides a split-type temperature and humidity sensor for environmental monitoring. Its purpose is to solve the technical problems of traditional sensors being susceptible to environmental interference, difficult to maintain, and data distortion through modular mechanical structure design, multi-level communication isolation circuits, and anti-interference algorithms.

[0007] To achieve the aforementioned objectives, the technical solution adopted by this utility model is as follows:

[0008] A split-type temperature and humidity sensor for environmental monitoring includes a detection unit installed in the return air duct of a clean area, a logic control unit installed in a non-clean area, and a display unit independently mounted on the wall of the clean area. The detection unit includes an SHT35 temperature and humidity sensor probe, a double-layer filter membrane structure, and a duct fixing flange. The logic control unit is physically connected to the detection unit via an aviation connector and includes an STM32F103 main control chip and an XTR111 current drive module. The display unit communicates with the logic control unit via an RS485 bus.

[0009] Furthermore, the detection unit uses a 3.3V low-power power supply, while the logic control unit uses a 24V industrial-grade stable power supply. The two are electrically isolated through an aviation connector, meeting the explosion-proof requirements of clean areas.

[0010] Furthermore, the detection unit and the logic control unit employ a protocol chain conversion, with the probe end communicating via I... 2The C protocol acquires SHT35 data and converts it into UART output. The logic control unit converts the UART data into a dual output of 4-20mA analog signal and RS485 digital signal. The display unit restores the RS485 signal to a UART-driven segment code screen.

[0011] Furthermore, the 24V input terminal of the logic control unit is equipped with an overvoltage protection circuit, which uses a 1N5824 diode and a self-resetting fuse MF-R050 in series to achieve reverse connection protection and withstand 60V surge impact.

[0012] Furthermore, the detection unit probe uses an SHT35 temperature and humidity IC with a filter membrane, and is additionally wrapped with a replaceable filter element to form a double protection structure. The probe end performs moving average de-extreme filtering and sensor linear compensation algorithm in real time.

[0013] Furthermore, the RS485 communication interface is equipped with a protection circuit, with a bidirectional TVS diode SMBJ6.8CA installed on each of the A / B lines to ground, forming common-mode + differential-mode full protection. A 22Ω resistor and a 100pF C0G capacitor are connected in series at the rear end of the TVS diode to filter out high-frequency noise.

[0014] Furthermore, the logic control unit uses the XTR111 chip to achieve dual-channel 4-20mA current output for temperature and humidity, supports three-wire long-distance transmission, and achieves an accuracy of ±0.1%FS, adapting to the complex wiring requirements of industrial environments.

[0015] Furthermore, the display unit integrates a dynamic error code mechanism, which detects the connection status through RS485 heartbeat packets and provides error codes such as E02: probe not connected and E03: logic board not connected, supporting accurate fault location.

[0016] Furthermore, the detection unit collects temperature and humidity data through the return air duct, avoiding local environmental interference and comprehensively reflecting the overall temperature and humidity status of the room. The modular design also reduces the replacement time of faulty components to ≤15 minutes.

[0017] Furthermore, the display unit adopts a high-protection-level shell that meets the IP65 waterproof and dustproof standard to ensure long-term stable operation; the detection unit is kept away from the cleaning area to avoid water ingress or physical damage caused by cleaning operations.

[0018] The beneficial effects of this utility model are as follows:

[0019] Precise monitoring: Data collection from return air ducts to avoid interference from local environmental factors;

[0020] High reliability: The split design reduces the risk of equipment damage;

[0021] Highly adaptable: Suitable for cleanroom environments of varying sizes;

[0022] Easy maintenance: Modular design facilitates inspection and replacement;

[0023] Improved anti-interference capability: The installation of return air ducts reduces the fluctuation range of temperature and humidity data by 70%;

[0024] Reduced maintenance costs: Modular design reduces replacement time for faulty parts to ≤15 minutes;

[0025] Multi-scenario adaptation: Supports 4-20mA / RS485 dual output, compatible with over 90% of industrial PLC systems. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the split-type temperature and humidity sensor system architecture of this utility model;

[0028] Figure 3 This is a schematic diagram of the detection unit structure of this utility model;

[0029] Figure 4 This is a schematic diagram of the logic control unit circuit of this utility model;

[0030] Figure 5 This is a schematic diagram of the RS485 interface protection circuit of this utility model.

[0031] Reference table for attached figures:

[0032] 1. Logic control unit; 2. Detection unit; 3. Duct fixing flange; 4. Display unit. Detailed Implementation

[0033] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0034] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0035] To make the content of this utility model easier to understand, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0036] like Figures 1 to 5 As shown, a split-type temperature and humidity sensor for environmental monitoring includes:

[0037] Detection Unit 2: Detection Unit 2 adopts a modular design and is installed inside the return air duct of the clean area. It includes an SHT35 temperature and humidity sensor probe, a double-layer filter membrane structure, and a duct fixing flange 3. The probe end uses an SHT35 temperature and humidity IC with a filter membrane, and is additionally wrapped with a replaceable filter element, forming a double protection structure to effectively filter dust and impurities in the return air duct. Detection Unit 2 is securely installed on the inner wall of the duct via the duct fixing flange 3 to ensure long-term stable operation.

[0038] Power supply: 3.3V low-power supply is adopted to meet the requirements of clean areas for low power consumption and low heat generation.

[0039] Logic Control Unit 1: Logic Control Unit 1 is independently installed in a non-clean area, using a stable 24V industrial-grade power supply. It is physically connected to Detection Unit 2 via an aviation connector to achieve electrical isolation. The unit contains an STM32F103 main control chip and an XTR111 current drive module, responsible for data acquisition, processing, and output.

[0040] Overvoltage protection: The 24V input terminal is equipped with an overvoltage protection circuit, which uses a 1N5824 diode and a self-resetting fuse MF-R050 in series to prevent overvoltage damage to the equipment.

[0041] Display Unit 4: Display Unit 4 is independently installed on the wall of the clean area, using an IP65-rated waterproof and dustproof housing to ensure stable operation in harsh environments. The unit communicates with the logic control unit 1 via an RS485 bus, integrates a dynamic error code mechanism, detects connection status via an RS485 heartbeat packet, and displays temperature and humidity data in real time.

[0042] Data Acquisition by Detection Unit 2: Detection Unit 2 probes acquire real-time temperature and humidity data within the return air duct, performing moving average extreme value filtering and sensor linear compensation algorithms to improve data accuracy. The probe end connects to I... 2 The C protocol communicates with the SHT35 sensor, and the acquired data is converted into UART output.

[0043] Data processing by logic control unit 1: Logic control unit 1 receives UART data from detection unit 2, performs protocol chain conversion, and converts the data into dual outputs of 4-20mA analog signal and RS485 digital signal. The 4-20mA analog signal is suitable for traditional industrial control equipment, while the RS485 digital signal facilitates integration with modern control systems.

[0044] Data restoration of display unit 4: Display unit 4 receives the RS485 signal from logic control unit 1 and restores it to a UART-driven segment code screen to realize intuitive display of temperature and humidity data.

[0045] The communication and protection circuits include:

[0046] RS485 Communication Interface Protection: The RS485 communication interface is equipped with a protection circuit. A bidirectional TVS diode SMBJ6.8CA is installed between the A and B lines and ground, forming full common-mode and differential-mode protection. A 22Ω resistor and a 100pF C0G capacitor are connected in series after the TVS diode to effectively suppress electromagnetic interference and ensure stable communication.

[0047] This utility model discloses a split-type temperature and humidity sensor for environmental monitoring. The sensor unit 2, logic control unit 1, and display unit 4 are designed separately, facilitating installation, maintenance, and expansion. Electrical isolation, overvoltage protection, and communication protection measures ensure stable operation in harsh environments. An integrated dynamic error code mechanism and heartbeat detection system monitor the device status in real time, improving maintenance efficiency.

[0048] This invention relates to a split-type temperature and humidity sensor for environmental monitoring. The detection unit 2 is installed inside the return air duct to collect temperature and humidity data in real time; the logic control unit 1 is installed in the non-clean area to process and output the data; and the display unit 4 is installed on the wall of the clean area to visually display the temperature and humidity data. This design effectively isolates equipment in clean and non-clean areas, reducing the risk of cross-contamination while ensuring accurate data transmission and display.

[0049] This utility model discloses a split-type temperature and humidity sensor for environmental monitoring, which achieves high-precision and high-reliability environmental monitoring functions and is suitable for various cleanroom environmental monitoring scenarios.

[0050] The above description is only a preferred embodiment of this utility model patent and is not intended to limit this utility model patent. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model patent should be included within the protection scope of this utility model patent.

Claims

1. A split-type temperature and humidity sensor for environmental monitoring, characterized in that: The system includes a detection unit installed in the return air duct of the clean area, a logic control unit installed in the non-clean area, and a display unit independently installed on the wall of the clean area. The detection unit includes an SHT35 temperature and humidity sensor probe, a double-layer filter membrane structure, and a duct fixing flange. The logic control unit is physically connected to the detection unit via an aviation connector and includes an STM32F103 main control chip and an XTR111 current drive module. The display unit communicates with the logic control unit via an RS485 bus.

2. The split-type temperature and humidity sensor according to claim 1, characterized in that: The detection unit is powered by a low-power 3.3V power supply, while the logic control unit is powered by a stable 24V industrial-grade power supply. The detection unit and the logic control unit are electrically isolated via an aviation connector.

3. The split-type temperature and humidity sensor according to claim 1, characterized in that: The detection unit and the logic control unit communicate via a protocol chain, with the probe end communicating via I... 2 The C protocol acquires SHT35 data and converts it into UART output. The logic control unit converts the UART data into a dual output of 4-20mA analog signal and RS485 digital signal. The display unit restores the RS485 signal to a UART-driven segment code screen.

4. The split-type temperature and humidity sensor according to claim 1, characterized in that: The 24V input terminal of the logic control unit is equipped with an overvoltage protection circuit, which uses a 1N5824 diode and a self-resetting fuse MF-R050 in series.

5. The split-type temperature and humidity sensor according to claim 1, characterized in that: The detection unit probe uses an SHT35 temperature and humidity IC with a filter membrane, and is additionally wrapped with a replaceable filter element to form a double protection structure. The probe end performs moving average de-extreme filtering and sensor linear compensation algorithm in real time.

6. The split-type temperature and humidity sensor according to claim 1, characterized in that: The RS485 communication interface is equipped with a protection circuit. A bidirectional TVS diode SMBJ6.8CA is installed on each of the A / B lines to ground to form common-mode and differential-mode full protection. A 22Ω resistor and a 100pF C0G capacitor are connected in series at the rear end of the TVS diode.

7. The split-type temperature and humidity sensor according to claim 1, characterized in that: The logic control unit uses the XTR111 chip.

8. The split-type temperature and humidity sensor according to claim 1, characterized in that: The display unit integrates a dynamic error code mechanism and detects the connection status via RS485 heartbeat packets.

9. The split-type temperature and humidity sensor according to claim 1, characterized in that: The detection unit collects temperature and humidity data through the return air duct.

10. The split-type temperature and humidity sensor according to claim 1, characterized in that: The display unit uses an IP65 waterproof and dustproof standard housing, and the detection unit is kept away from the clean area.

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