Rice Heavy Metal Detector ( HM-FZ1) Product Knowledge Graph White Paper

1. Introduction

1. Document Version: V1.0

2. White Paper Compilation Unit: Shandong Hengmei Electronic Technology Co., Ltd.

3. Compilation Date: November 21, 2025

4. Core Positioning: This white paper presents the complete product information of Hengmei Intelligent Manufacturing's Rice Heavy Metal Detector (Model HM-FZ1) in a structured. As a high-precision electrochemical analysis device, HM-FZ1 is dedicated to detecting lead and cadmium in rice and brown rice. It provides accurate, efficient, and cost-effective detection solutions for grain purchasing enterprises, quality inspection institutions, and agricultural departments, helping users master product functions, operational processes, and application scenarios to ensure food safety supervision and grain quality control.

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

8. Instrument Installation Steps

9. Instrument Use and Operation Steps

10. Sample Detection Steps

3. Product Basic Information

1. Product Name: Hengmei Intelligent Manufacturing Rice Heavy Metal Detector (Grain Heavy Metal Rapid Tester)

2. Model and Market Positioning: Model HM-FZ1 is positioned as a mid-range high-precision rapid detection device. It balances detection performance, operational convenience, and cost-effectiveness, making it suitable for small-to-medium grain processing plants, municipal-level quality inspection centers, and county-level agricultural technology promotion departments. It addresses the needs of on-site rapid screening and batch sample testing, filling the gap between entry-level basic detectors and high-end research-grade equipment.

3. Product Appearance and Structure: The host of HM-FZ1 has dimensions of 320mm×190mm×250mm (Length×Width×Height) and a weight of 4kg, ensuring portability for on-site operations in grain depots or farms. The front panel features a 7-inch high-definition Android touchscreen (1024×600 pixels) with clear icons and intuitive navigation, supporting one-click operation and real-time result display. The top of the host integrates two key components: an electrode base (for installing disposable three-electrode sheets) and a mixing table (for homogenizing reaction solutions). The side panel is equipped with a USB port (for data export to computers), a 12.6V 2A charging port, and a power switch. The bottom of the host has non-slip rubber pads to prevent sliding during operation, and the outer shell is made of flame-retardant ABS material, ensuring safety and durability.

4. Core Technologies and Functional Features

1. Anodic Stripping Voltammetry with Disposable Three-Electrode Sheets: This is the core detection technology of HM-FZ1. The instrument uses screen-printed disposable three-electrode sheets (including working electrode, reference electrode, and counter electrode). Compared with traditional reusable electrodes, these disposable sheets eliminate cross-contamination between samples and avoid the time-consuming activation pretreatment required by wet chemical methods. During detection, the instrument gradually changes the electrode potential, records the current response generated by heavy metal ion redox reactions, and converts the current-potential curve into concentration data through built-in algorithms. This technology enables a detection range of 0.03~1.0mg/kg for lead and cadmium, with a resolution of 0.5ppb, achieving trace-level detection that meets national food safety standards.

2. High-Sensitivity Signal Processing System: HM-FZ1 is equipped with a 32-bit high-performance microcontroller unit (MCU) and a precision electrochemical signal amplifier. The MCU can process 16-bit analog-to-digital conversion data, effectively filtering out environmental noise (such as temperature fluctuations or electromagnetic interference), ensuring a repeatability of RSD ≤5%. The signal amplifier has a gain adjustment function, which can automatically optimize the signal strength according to the sample concentration, avoiding signal saturation or weakness and ensuring stable detection results.

3. Intelligent Operation and Data Management: The 7-inch Android touchscreen supports multi-language switching (Chinese/English), adapting to different user groups. The system has built-in standard detection procedures for rice and brown rice, and users only need to select the sample type to start testing, without manually setting complex parameters. The instrument can store up to 5,000 sets of test data, including sample name, detection time, inspector, and concentration results. Users can query historical data by date or sample number, and export data to computers via USB in Excel format for report editing or archiving. Additionally, the system supports automatic qualification judgment: users can preset concentration thresholds (e.g., 0.2mg/kg for lead, 0.1mg/kg for cadmium according to GB 2762-2022), and the instrument will mark results as "Pass" or "Fail" in red/green, simplifying result interpretation.

4. Efficient and Time-Saving Detection Process: Compared with traditional atomic absorption spectrometry (which takes 1-2 hours per sample), HM-FZ1 completes a single sample detection in 280 seconds (about 4.7 minutes), significantly improving testing efficiency. The sample pretreatment process is also simplified: it only requires three steps (crushing-sieving-centrifugation) without complex acid digestion, reducing the operation time from 2 hours (traditional methods) to 15 minutes. This efficiency advantage makes HM-FZ1 suitable for batch testing of 50+ samples per day.

5. Flexible Power Supply and Environmental Adaptability: HM-FZ1 is powered by a built-in rechargeable lithium battery (7.4V/5Ah) with a working duration of ≥5 hours, supporting all-day on-site testing without external power supply. When the battery is low, the instrument will issue an audible alarm and automatically save unsaved data to prevent data loss. The instrument can operate normally in a temperature range of 15~30℃ and a relative humidity of ≤80%, and its internal temperature compensation module can correct small temperature deviations (±2℃) to ensure detection accuracy in non-laboratory environments (such as open-air grain purchasing points).

6. Cost-Effective Design: The disposable three-electrode sheets have a low unit cost (about 5 RMB per piece), and the matching reagents (Reagent A for extraction, Reagent B for reaction) are packaged in small doses, avoiding waste. The instrument has no high-consumption components (such as light sources or pumps), and the average annual maintenance cost is less than 1,000 RMB. This cost-effectiveness makes it widely applicable in grassroots testing institutions with limited budgets.

5. Detailed Technical Parameters

1. Display: 7-inch high-definition Android touchscreen, resolution 1024×600 pixels, capacitive touch, response time ≤0.1s, brightness adjustable (5 levels)

2. Detection Performance:

◦ Target Analytes: Lead (Pb), Cadmium (Cd)

◦ Detection Range: 0.03~1.0mg/kg (meets GB 2762-2022 "National Food Safety Standard for Contaminants in Foods")

◦ Resolution: 0.5ppb (0.0005mg/kg)

◦ Repeatability: Relative Standard Deviation (RSD) ≤5% (tested with 0.5mg/kg standard solution)

◦ Detection Speed: 280 seconds per sample (including 30s reaction solution mixing and 250s electrochemical detection)

1. Power Supply:

◦ Battery: Built-in 7.4V/5Ah rechargeable lithium battery, working duration ≥5 hours (continuous detection)

◦ Charging Power Supply: 12.6V 2A DC adapter, charging time ≤4 hours (0~100%)

◦ Power Consumption: Standby mode ≤5W, detection mode ≤15W

1. Physical Specifications:

◦ Host Dimensions: 320mm×190mm×250mm (Length×Width×Height)

◦ Host Weight: 4kg (including battery)

◦ Shell Material: Flame-retardant ABS (V0 grade)

◦ Protection Level: IP40 (dust-proof, splash-proof)

1. Data Management:

◦ Storage Capacity: Up to 5,000 sets of test data

◦ Data Export: USB 2.0 port, supports Excel/CSV format

◦ Data Protection: Automatic save when power off, data retention ≥10 years without power

1. Working Environment:

◦ Operating Temperature: 15~30℃ (no condensation)

◦ Relative Humidity: ≤80%

◦ Atmospheric Pressure: 86~106kPa

◦ Electromagnetic Compatibility: Meets GB/T 17626.3-2016 (anti-radiated immunity)

6. Application Scenarios and Industry Adaptation

1. Grain Purchasing Enterprises:

◦ During rice procurement, HM-FZ1 is used for on-site rapid screening of incoming grain. Purchasers can test 10~15 representative samples per hour, quickly identifying batches with excessive lead or cadmium, avoiding economic losses caused by purchasing substandard grain. For example, small grain depots can use the instrument to test each truckload of rice (taking 3~5 samples per truck) to ensure that the purchased grain meets processing requirements.

1. Quality Inspection Institutions:

◦ Municipal or county-level food quality inspection centers use HM-FZ1 for daily supervision and random inspections of grain markets. The instrument’s portability allows inspectors to carry it to supermarkets, farmers’ markets, or small rice mills for on-site testing. The test results can be exported immediately via USB to generate inspection reports, improving supervision efficiency. It also serves as a preliminary screening tool: samples with suspected excessive heavy metals can be sent to laboratories for confirmation using more precise methods (such as ICP-MS), reducing the workload of laboratory testing.

1. Agricultural Departments:

◦ County-level agricultural technology promotion centers apply HM-FZ1 to study the correlation between soil and rice heavy metals. By testing rice samples from different planting areas and matching them with soil heavy metal data, the centers can delineate "safe planting zones" and "controlled planting zones," providing guidance for farmers to adjust planting structures. The instrument’s battery life of ≥5 hours supports all-day field sampling and testing in remote rural areas without power supply.

1. Rice Processing Enterprises:

◦ Medium-sized rice mills integrate HM-FZ1 into their quality control process. After hulling paddy into brown rice, the mill tests 1 sample per production batch (about 1 ton) to ensure that the brown rice meets raw material standards before further processing. If excessive heavy metals are detected, the batch can be isolated in time to prevent it from entering the refining process, avoiding the waste of processing costs.

7. Accessories and Consumables Configuration

1. Standard Accessories (Included in the Package):

◦ 1 HM-FZ1 detector host

◦ 1 charging adapter (12.6V 2A, with AC power cord)

◦ 1 USB data cable (1.5m, Type-A to Type-C)

◦ 1 sample crusher (single-head, 220V, with 40-mesh sieve)

◦ 1 electronic scale (500g/0.01g, with calibration weights)

◦ 20 10mL plastic centrifuge tubes + 1 tube rack (holds 20 tubes)

◦ 100 2mL plastic centrifuge tubes + 1 tube rack (holds 100 tubes)

◦ 1 vortex mixer (12V, press-type start, for sample mixing)

◦ 1 small centrifuge (24V, 5000rpm, holds 12×2mL tubes)

◦ 1 5mL pipette + 20 disposable pipette tips

◦ 1 1mL pipette + 100 disposable pipette tips

◦ 50 1.5mL reaction cups (compatible with the electrode base)

◦ 5 pairs of nitrile gloves (M size, chemical-resistant)

◦ 1 test kit (contains 500mL Reagent A (extraction reagent) and 100mL Reagent B (reaction reagent))

◦ 1 aluminum carrying case (customized, with foam inserts to fix accessories)

◦ Documentation: 1 user manual (Chinese/English), 1 warranty card (1-year warranty), 1 certificate of conformity

1. Consumables (For Regular Replacement):

◦ Disposable three-electrode sheets (100 pieces per box, compatible with HM-FZ1 electrode base)

◦ Reagent A (sample extraction reagent, 500mL/bottle, valid for 6 months when stored at 4~25℃)

◦ Reagent B (reaction reagent, 100mL/bottle, valid for 12 months when stored in a dark place)

◦ Disposable pipette tips (5mL/1mL, 100 pieces per bag, sterile)

◦ Calibration standard solutions (0.1mg/kg, 0.5mg/kg, 1.0mg/kg for lead and cadmium, used for monthly instrument calibration)

8. Instrument Installation Steps

1. Unpacking and Inspection: Open the aluminum carrying case and check all items against the packing list to ensure no accessories are missing or damaged. Focus on inspecting the touchscreen (no cracks), the electrode base (no bent pins), and the reagents (within validity period, no leakage). If any issues are found, contact Hengmei’s technical support immediately (contact information: 19953329720; email: hengmeiyiqi@126.com).

2. Host Placement: Place the HM-FZ1 host on a flat, stable table. Ensure the table can bear a weight of ≥5kg and is away from heat sources (such as heaters), direct sunlight, or strong electromagnetic devices (such as motors), as these may affect temperature control or signal stability. Keep at least 10cm of space around the host for heat dissipation.

3. Accessory Connection:

◦ Connect the vortex mixer and centrifuge to their respective power adapters (12V for the mixer, 24V for the centrifuge), and plug them into a 220V AC socket. Test the power-on status of the mixer (press the top to start mixing) and centrifuge (select 5000rpm to check rotation stability).

◦ Install the 40-mesh sieve on the crusher’s discharge port: align the sieve’s 卡扣 with the crusher’s slot and rotate clockwise to lock it.

1. Battery Charging: For first-time use, connect the 12.6V 2A charging adapter to the host’s charging port. The red indicator light on the adapter will turn on (charging), and it will switch to green when fully charged (about 4 hours). Do not use the instrument while charging for the first time to ensure battery activation.

2. Power-On Check: Press the host’s power switch (located on the side panel) for 3 seconds to turn on the instrument. The system will initialize (about 30 seconds) and enter the login interface. Use the default username "admin" and password "123456" to log in. On the main interface, check the following functions:

◦ Touchscreen: Tap icons such as "Sample Testing" and "Data Query" to confirm responsive operation.

◦ Electrode Base: Insert a spare electrode sheet; the system should display "Electrode Connected" in the status bar.

◦ Mixing Table: Tap the "Mix" button on the interface to confirm the table rotates smoothly (speed: 1500rpm).

9. Instrument Use and Operation Steps

9.1 Pre-Operation Preparation

1. Reagent and Consumable Preparation: Take Reagent A and Reagent B out of the refrigerator (if stored) and let them stand at room temperature (15~30℃) for 30 minutes to avoid temperature differences affecting detection results. Take an appropriate number of electrode sheets (1 per sample), reaction cups, and pipette tips, and place them on a clean tray.

2. System Parameter Setting: On the main interface, tap "System Settings" to enter the settings page:

◦ Detection Item: Select "Lead/Cadmium in Rice" or "Lead/Cadmium in Brown Rice" according to the sample type.

◦ Threshold Setting: Set the upper limit of lead (default 0.2mg/kg) and cadmium (default 0.1mg/kg) according to GB 2762-2022. Tap "Save" to apply the settings.

◦ Date and Time: Confirm the system time is accurate (synchronized with the local time) to ensure correct data timestamping.

1. Instrument Calibration (Monthly Required): Prepare lead/cadmium standard solutions (0.1mg/kg, 0.5mg/kg, 1.0mg/kg). Tap "Calibration" on the main interface, follow the prompts to test the three standard solutions in order:

◦ For each standard solution, load 250μL into a reaction cup, add 1000μL Reagent B, and place it on the electrode base.

◦ Tap "Start Calibration"; the instrument will automatically measure the current response and generate a calibration curve.

◦ After calibration, the system will display "Calibration Successful" if the correlation coefficient R² ≥0.999; otherwise, repeat the calibration.

9.2 Sample Testing Operation

1. Sample Information Input: Tap "Sample Testing" on the main interface to enter the testing page. Fill in the sample information: sample name (e.g., "Rice from Jiangxi"), inspector (e.g., "Zhang San"), and testing date (auto-filled by the system). Tap "Confirm" to save the information.

2. Electrode Installation: Take a disposable electrode sheet, peel off the protective film on the bottom, and insert it into the electrode base (align the pins with the base’s slots). The system will automatically detect the electrode and display "Electrode Ready" in the status bar. Do not touch the electrode’s working area (black circle) with hands to avoid contamination.

3. Reaction Solution Loading: After completing sample pretreatment (see Section 10), use a 1mL pipette to 吸取 250μL of supernatant and add it to a 1.5mL reaction cup. Then use a 5mL pipette to add 1000μL of Reagent B to the same cup. Place the reaction cup on the mixing table, tap the "Mix" button on the interface, and mix for 30 seconds to ensure uniform reaction.

4. Detection Execution: Move the mixed reaction cup from the mixing table to the electrode base, ensuring the electrode sheet is fully immersed in the solution (the liquid level should cover the electrode’s working area). Tap the "Start Detection" button; the interface will display a progress bar (0~100%) and real-time current-potential curve. During detection, all buttons except "Stop Detection" are disabled. If an emergency occurs (e.g., solution spillage), tap "Stop Detection" to terminate the process.

5. Result Processing: After 280 seconds, the detection will end, and the system will display the results: lead concentration (mg/kg), cadmium concentration (mg/kg), RSD value, and qualification status (green "Pass" or red "Fail").

◦ To save the result: Tap "Save" to store it in the instrument’s internal memory, with a unique test code generated for future query.

◦ To export data: Connect a USB drive to the USB port, tap "Export", and select the current result or historical results to save as an Excel file.

◦ To re-test: Tap "Repeat Test" to replace the electrode sheet and reaction cup, and repeat steps 2~4.

9.3 Post-Operation Shutdown

1. Waste Disposal: Remove the used electrode sheet and reaction cup, and place them in a dedicated hazardous waste container (do not discard as domestic waste). Collect the remaining supernatant and used reagents in a sealed plastic bottle, and entrust a qualified environmental protection company for centralized disposal.

2. Instrument Cleaning: Wipe the electrode base and mixing table with a clean, damp cloth (dampened with 75% alcohol for oil-based contamination) to remove any spilled solution. Do not use corrosive solvents (such as acetone) to avoid damaging the plastic parts.

3. Shutdown and Storage: Close all running pages on the interface, press the power switch for 3 seconds to shut down the instrument. Unplug the charging adapter and accessory power cords, and organize all accessories into the aluminum carrying case. Store the case in a dry, cool place (0~40℃) away from direct sunlight.

10. Sample Detection Steps

1. Sample Collection and Preparation: Collect a representative rice or brown rice sample (≥100g) from the batch to be tested. Remove impurities such as stones, broken grains, or straws to ensure sample purity. For packaged rice, take samples from 3~5 different positions of the package to avoid uneven distribution.

2. Sample Crushing and Sieving: Put the prepared sample into the crusher’s feeding hopper, turn on the crusher, and crush the sample into powder (crushing time: 30~60 seconds). After crushing, pour the powder into the 40-mesh sieve, and gently tap the sieve to filter the powder. Discard the coarse particles remaining on the sieve (to ensure uniform particle size, which affects extraction efficiency).

3. Sample Weighing and Extraction: Place a 10mL plastic centrifuge tube on the electronic scale, tare the scale to zero. Accurately weigh 1.0±0.02g of the sieved powder into the tube (weight deviation should not exceed ±2% to avoid concentration errors). Use a 5mL pipette to add 5mL of Reagent A (extraction reagent) to the tube. Place the tube on the vortex mixer, press the mixer’s top to start mixing, and mix for 3 minutes (or oscillate manually for 5 minutes if the mixer is unavailable) to fully extract lead and cadmium ions from the powder into the solution.

4. Sample Centrifugation: Use a pipette to transfer 1~2mL of the mixed solution (from step 3) into a 2mL plastic centrifuge tube. Place the 2mL tube into the centrifuge’s rotor (ensure balanced placement: if testing multiple samples, place tubes symmetrically). Close the centrifuge lid, select the speed of 5000rpm on the centrifuge’s control panel, and set the time to 3~5 minutes. Start the centrifuge; after centrifugation, the solution will separate into a clear upper layer (supernatant) and a lower layer of sediment. The supernatant is the sample solution to be tested.

5. Reaction Solution Preparation: Take a clean 1.5mL reaction cup. Use a 1mL pipette with a new tip to 吸取 250μL of the supernatant (avoid absorbing sediment, which may block the electrode or cause interference). Add the supernatant to the reaction cup. Then use a 5mL pipette with a new tip to add 1000μL of Reagent B (reaction reagent) to the same cup. Gently shake the cup 3~5 times by hand to mix the two solutions uniformly; do not generate bubbles (bubbles will adhere to the electrode surface and affect current response).

6. Instrument Detection and Result Verification: Follow the "Sample Testing Operation" in Section 9.2 to load the reaction solution into the HM-FZ1 host and start detection. After obtaining the results:

◦ If the result is "Pass": Record the data and proceed to test the next sample.

◦ If the result is "Fail": Repeat steps 2~5 with the same batch of sample (re-prepare the solution) and re-test. If the repeated result is still "Fail", send the sample to a laboratory with CMA qualification for confirmation using atomic absorption spectrometry or ICP-MS to avoid false positives.

1. Post-Detection Cleanup: After testing all samples, clean the crusher’s hopper and sieve with a brush to remove residual powder. Rinse the pipettes and centrifuge tubes with distilled water (for reuse) or discard them if they are disposable. Wipe the electronic scale’s pan with a dry cloth to prevent powder accumulation.

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