Soil Respiration Analyzer Product Knowledge Graph White Paper

1. Introduction

1. Document Version: V1.0

2. Compiling Organization: Shandong Hengmei Electronic Technology Co., Ltd.

3. Compilation Date:2025.12.2

4. Core Positioning: This white paper is a structured product knowledge graph for the three models (HM-TH1, HM-TH2, HM-TH3) of soil respiration analyzers under Hengmei Intelligent Manufacturing. It systematically organizes comprehensive product information, including basic parameters, technical features, application scenarios, and operation procedures. It provides accurate and detailed product data support for industry user selection, and usage.

2. Table of Contents

1. Introduction

2. Table of Contents

3. Product Basic Information

4. Core Technologies and Functional Features

5. Detailed Technical Parameters

6. Application Scenarios and Industry Adaptation

7. Accessories and Consumables Configuration

3. Product Basic Information

1. Product Name: Hengmei Intelligent Manufacturing Soil Respiration Analyzer

2. Product Models 

◦ HM-TH1: It can display real-time changes of CO₂ concentration, H₂O (humidity), temperature, and atmospheric pressure inside the respiration chamber. It adopts the Android operating system, supports multi-channel detection, data storage and export, and data upload to supervision platforms via wifi. It does not have the function of detecting N₂O, CH₄, or soil-related parameters (moisture, temperature, electrical conductivity).

◦ HM-TH2: Based on HM-TH1, it adds the detection function of N₂O and CH₄. It can not only measure the emission amounts of N₂O and CH₄ but also display their emission rates. It supports 4G networking in addition to wifi, and is equipped with an independent respiration chamber packaging. All other functions of HM-TH1 are retained.

◦ HM-TH3: On the basis of HM-TH2, it further adds the detection function of soil parameters (soil moisture, soil temperature, soil electrical conductivity). It can display both gas parameters (CO₂, H₂O, N₂O, CH₄) and soil-related parameters in real time, meeting more in-depth soil respiration research needs. The networking and data management functions are consistent with HM-TH2.

3. Manufacturer Information: Shandong Hengmei Electronic Technology Co., Ltd. Address: Oulong Science and Technology Park, Jinma Road No.1, Weifang City, Shandong Province.

4. Product Usage: Widely used in agricultural ecological research, carbon source and sink research, global climate change studies, land use change research, ecological restoration research, soil microbial activity assessment, plant ecology research, insect respiration research, root respiration research, and fruit storage. By monitoring soil respiration and related parameters, it can estimate the responses of plant roots and soil microorganisms to climate change, providing key data support for evaluating biological processes in ecosystems.

4. Core Technologies and Functional Features

1. Core Technologies

◦ Multi-Gas Detection Integration Technology: HM-TH1 integrates CO₂, H₂O, temperature, and pressure detection modules; HM-TH2 adds N₂O and CH₄ detection modules on this basis; HM-TH3 further integrates soil parameter detection modules. This integration realizes simultaneous detection of multiple parameters, avoiding the need for separate operation of multiple instruments and improving detection efficiency.

◦ Intelligent Networking Transmission Technology: All models support wifi networking; HM-TH2 and HM-TH3 additionally support 4G networking. They are equipped with cloud services, enabling real-time wireless upload of detected data to cloud platforms. This facilitates remote data monitoring, management, and regional ecological data analysis and early warning.

◦ Automatic Calculation Technology for Emission Rates: The instrument can automatically calculate respiration intensity/carbon flux (based on CO₂ data) in units of μmol/m²·s. HM-TH2 and HM-TH3 can also automatically calculate N₂O and CH₄ emission rates (based on N₂O and CH₄ data respectively) in the same unit, eliminating manual calculation errors.

◦ Dynamic Data Display Technology: A dedicated dynamic analysis software is installed. Real-time experimental processes (including changes in gas concentration, temperature, and humidity) can be displayed on the Android touchscreen, eliminating the need for data copying and sorting on a computer, and simplifying data analysis procedures.

2. Common Functional Features

◦ Intelligent Operating System: Adopts the Android operating system with a 7-inch high-definition touchscreen. The operation interface is in Chinese, simple and intuitive, reducing the learning cost for users.

◦ Adjustable Gas Flow Rate: The standard gas flow rate is 800ml/min, and it can be adjusted through the instrument. This allows experiments on soil respiration intensity under different flow rates to meet diverse research needs.

◦ Large-Capacity Data Storage: Equipped with 16G storage space, capable of storing more than 100,000 pieces of data. Data is not lost when the power is off, ensuring complete retention of detection records.

◦ Multiple Data Export Methods: Data can be directly exported to a USB flash drive via the USB interface without the need for driver installation. The data format is Excel, which is convenient for local data sorting and analysis.

◦ GPS Positioning Function: Supports GPS positioning, enabling the association of detection data with geographical location information. This is convenient for tracking and managing data from different sampling sites.

3. Model-Specific Functional Features

◦ HM-TH2: Adds N₂O and CH₄ detection functions, with independent packaging for the respiration chamber (packaging size 270150240mm, weight 1.5kg). It supports 4G networking, expanding the scope of outdoor use compared to HM-TH1.

◦ HM-TH3: Adds soil parameter detection functions (soil moisture, soil temperature, soil electrical conductivity). It is equipped with corresponding soil sensors, enabling simultaneous monitoring of gas and soil parameters. This helps in analyzing the correlation between soil properties and gas emissions.

5. Detailed Technical Parameters

1. Common Parameters for All Models

◦ CO₂ Detection: Measurement range 0-5000ppm; accuracy ≤1% VOL; resolution 1ppm; detection limit ≤1% VOL

◦ H₂O (Humidity) Detection: Measurement range 0-100%RH; accuracy ≤±2%RH; resolution 0.001; detection limit ≤1%RH

◦ Atmospheric Pressure Detection: Measurement range 300-1100hPa; resolution 1hPa; error 10hPa

◦ Respiration Chamber Temperature Detection: Measurement range 0-50℃; resolution 0.001; error ±0.2℃

◦ Respiration Intensity/Carbon Flux: Unit μmol/m²·s, automatically calculated by the instrument based on CO₂ measurement data

◦ Gas Flow Rate: Standard 800ml/min, adjustable

◦ Respiration Chamber Size: 180mm (H) × 100mm (D)

◦ Respiration Chamber Volume: 1413cm³

◦ Power Supply: 12V DC lithium battery, 8 hours of continuous operation when fully charged

◦ Storage Capacity: 16G, storing more than 100,000 pieces of data

◦ Display: 7-inch high-definition touchscreen

◦ Operating System: Android

2. HM-TH2 Specific Parameters

◦ N₂O Detection: Measurement range 0-500ppm; accuracy ≤±2%F.S.; resolution 1ppm; detection limit ≤1%

◦ CH₄ Detection: Measurement range 0-100ppm; accuracy ±2ppm; resolution 0.5ppm; detection limit ≤1%

◦ N₂O Emission Rate: Unit μmol/m²·s, automatically calculated based on N₂O data

◦ CH₄ Emission Rate: Unit μmol/m²·s, automatically calculated based on CH₄ data

◦ Respiration Chamber Humidity Detection: Measurement range 0-100%RH; resolution 0.001; error ±1%RH

◦ Networking: Supports wifi and 4G

◦ Instrument Packaging Size: 550245375mm; Instrument Packaging Weight: 9.5kg

◦ Respiration Chamber Packaging Size: 270150240mm; Respiration Chamber Packaging Weight: 1.5kg

3. HM-TH3 Specific Parameters

◦ Soil Moisture Detection: Measurement range 0-100%; accuracy ±2% (0-50% range), ±3% (50-100% range); resolution 0.1%

◦ Soil Temperature Detection: Measurement range -40-120℃; accuracy ±0.5℃; resolution ±0.1℃

◦ Soil Electrical Conductivity Detection: Measurement range 0-20000us/cm; accuracy ±3% (0-10000us/cm range), ±5% (10000-20000us/cm range); resolution 10us/cm (0-10000us/cm range), 50us/cm (10000-20000us/cm range)

◦ Networking: Supports wifi and 4G

◦ Packaging Size: 550245375mm; Packaging Weight: 9.5kg

6. Application Scenarios and Industry Adaptation

1. Application Scenarios

◦ Agricultural Ecological Research Scenarios: In farmland and orchard ecosystems, monitor the impact of different farming methods (such as no-tillage, crop rotation) on soil respiration and carbon flux, providing data support for formulating low-carbon agricultural development strategies.

◦ Carbon Source and Sink Research Scenarios: In ecosystems such as forests, grasslands, and wetlands, conduct long-term monitoring of soil CO₂, N₂O, and CH₄ emissions (HM-TH2 and HM-TH3), evaluate the carbon sink capacity of the ecosystem, and serve global carbon cycle research.

◦ Global Climate Change Research Scenarios: Analyze the response of soil gas emissions to temperature and precipitation changes, and explore the interaction mechanism between soil respiration and climate change.

◦ Land Use Change Research Scenarios: Compare soil respiration differences between different land use types (such as farmland converted to forest, construction land occupied farmland), and assess the ecological impact of land use changes.

◦ Ecological Restoration Research Scenarios: In mine restoration areas and saline-alkali land improvement areas, monitor changes in soil respiration and related parameters to evaluate the effectiveness of ecological restoration measures.

◦ Soil Microbial Activity Assessment Scenarios: Use soil respiration intensity as an indicator to assess the activity of soil microbial communities, and analyze the impact of environmental factors (such as soil moisture, temperature) on microbial activity (HM-TH3 is more suitable for this scenario due to its soil parameter detection function).

2. Industry Adaptation

◦ Scientific Research Industry: Institutes of agricultural science, ecological environment research centers, and universities. Used in scientific research projects related to soil ecology, carbon cycle, and climate change.

◦ Environmental Protection Industry: Environmental monitoring stations and ecological assessment companies. Used for monitoring and assessing soil ecological functions in environmental impact assessment and ecological restoration projects.

◦ Agricultural Industry: Agricultural technology promotion departments and large-scale agricultural enterprises. Used to guide agricultural production practices such as fertilization and irrigation, and promote low-carbon and high-efficiency agricultural development.

◦ Forestry Industry: Forestry research institutes and forest management departments. Used for monitoring soil respiration in forest ecosystems and evaluating the carbon sequestration capacity of forests.

7. Accessories and Consumables Configuration

1. Standard Accessories for All Models

◦ Instrument Host: 1 unit, integrating gas detection modules, data processing units, touchscreen, and built-in printer.

◦ Respiration Chamber: 1 unit, size 180mm (H) × 100mm (D), volume 1413cm³.

◦ Charger: 1 unit, suitable for charging the 12V DC lithium battery.

◦ Data Cables (Air Hoses): 1 set, including air hoses for connecting the host and the respiration chamber, and USB data cables for data export.

◦ User Manual: 1 copy, detailing instrument operation, maintenance, and troubleshooting.

◦ USB Flash Drive: 1 unit, used for data storage and export.

◦ Certification of Conformity: 1 copy, proving that the instrument meets quality standards.

◦ Packaging Carton: 1 unit, used for instrument transportation and storage.

2. HM-TH2 Additional Accessories

◦ Independent Respiration Chamber Packaging Box: 1 unit, size 270150240mm, used for separate storage and transportation of the respiration chamber.

3. HM-TH3 Additional Accessories

◦ Soil Sensor Set: 1 set, including soil moisture sensor, soil temperature sensor, and soil electrical conductivity sensor. Each sensor is equipped with a 2-meter-long cable for buried soil detection.

4. Consumables Description

◦ Common Consumables: Lithium battery (needs to be replaced after long-term use, usually with a service life of 2-3 years), printer paper (for the built-in printer, needs to be replaced regularly according to usage frequency).

◦ Special Consumables: Soil sensor probes (for HM-TH3, may be worn after long-term buried use and need to be replaced every 3-5 years depending on usage conditions).

◦ Consumables Replacement Note: Consumables should be purchased from official channels to ensure compatibility with the instrument. When replacing the lithium battery, follow the operation guidelines in the user manual to avoid damage to the instrument.

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