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Water quality monitoring agencies and environmental testing laboratories face mounting pressure to deliver accurate permanganate index (CODMn) results while meeting increasingly stringent regulatory deadlines. Manual titration methods are labor-intensive, prone to operator error, and difficult to standardize across field and lab environments. The HM-TCMn Permanganate Index Analyzer was engineered specifically to resolve these operational bottlenecks.
Built around the permanganate method codified in GB/T 5750.7-2023, the HM-TCMn automates the colorimetric determination of CODMn with measurement error of ≤±5% and instrument repeatability below 0.5%. Its precision colorimetric cell integrates an imported ultra-bright LED light source with auto-calibration, achieving photometric stability of ≤0.002A drift over 20 minutes — a specification that rivals benchtop spectrophotometers at a fraction of the footprint.
For environmental monitoring stations managing dozens of sampling points, the HM-TCMn's cloud platform connectivity transforms field data collection: test results transmit directly to regulatory databases via WiFi, RJ45, or mobile hotspot, eliminating transcription errors and accelerating compliance reporting. The built-in thermal printer generates on-site reports with QR codes for instant traceability, while 8 million onboard data groups ensure no measurement is ever lost.
When paired with the optional 6Ah lithium battery, the HM-TCMn operates independently of mains power — enabling river inspection, water source sampling, and emergency response scenarios where grid electricity is unavailable. The Android 7.1.1 operating system supports remote firmware upgrades, ensuring the instrument evolves alongside changing regulatory standards without requiring hardware replacement.
| Parameter | Specification |
|---|---|
| Model | HM-TCMn |
| Brand | HM Instruments (恒美智造) |
| Detection Method | Permanganate method (CODMn) |
| Reference Standard | GB/T 5750.7-2023 |
| Measurement Error | ≤±5% |
| Instrument Stability | <0.5% |
| Instrument Repeatability | <0.5% |
| Photometric Stability | ≤0.002A drift / 20min (100,000 hr LED lifespan) |
| Detection Range | Acidic 0–25 mg/L (segmented), Alkaline 0–4.5 mg/L |
| Detection Limit | 0.25 mg/L |
| Colorimetric Method | 16mm digestion/colorimetric integrated tube; cuvettes (10mm, 30mm, 50mm) |
| Operating System | Android 7.1.1 |
| Display | 10.1" HD color LCD touchscreen |
| Network Interfaces | USB 2.0, WiFi, Bluetooth, Hotspot, RJ45 |
| Printer | Thermal line printer with QR code support |
| Data Storage | 8 million groups |
| Data Export | Excel format via USB |
| Dimensions | 444 × 303 × 173 mm |
| Weight | 5.2 kg |
| Operating Temperature | 5–40°C |
| Operating Humidity | <85% RH (no condensation) |
| Power Consumption | 10W |
| Power Supply | AC 220V ±10% / 50Hz |
| Optional Accessory | 6Ah large-capacity lithium battery |
The permanganate index, also known as CODMn, measures the amount of oxygen consumed by organic and inorganic matter in water when oxidized by potassium permanganate under specified conditions. It is a key indicator of organic pollution in surface water and drinking water. Unlike COD (chemical oxygen demand) which uses dichromate, the permanganate method is milder and specifically mandated by GB/T 5750.7-2023 for drinking water compliance. Environmental monitoring stations use CODMn to track pollution trends, assess treatment effectiveness, and demonstrate regulatory compliance. The HM-TCMn automates this method with colorimetric detection, eliminating subjective visual endpoint determination inherent in manual titration.
The HM-TCMn implements both acidic and alkaline permanganate digestion protocols as specified in the standard, with segmented detection ranges (acidic: 0–25 mg/L, alkaline: 0–4.5 mg/L) that cover the full scope of drinking water and surface water testing requirements. The instrument's measurement error of ≤±5% and repeatability of <0.5% meet the precision requirements outlined in the standard. Additionally, the built-in cloud platform connectivity allows direct submission of test results to provincial and national environmental monitoring databases, supporting the data reporting requirements that accompany regulatory compliance audits.
The HM-TCMn is designed for both laboratory and field deployment. In the lab, it operates on AC220V mains power with RJ45 or WiFi connectivity for seamless data integration. For field applications — such as river inspection, water source sampling, or emergency pollution response — the optional 6Ah lithium battery provides over 4 hours of independent operation. At just 5.2 kg with a compact 444 × 303 × 173 mm footprint, the instrument is easily transported in a vehicle. The Android operating system, touchscreen interface, and built-in thermal printer mean no laptop or external device is needed on-site; technicians can complete testing, review results, and print QR-coded reports in a single workflow.
The HM-TCMn connects to regulatory cloud platforms via WiFi, RJ45 Ethernet, or mobile phone hotspot — whichever is available at the testing location. After completing a measurement, the operator selects the cloud upload function, and the instrument transmits the test record (including timestamp, sample ID, CODMn value, and operator information) directly to the designated environmental monitoring database. This eliminates manual data entry into separate reporting systems, reducing transcription errors and audit trail gaps. The 8-million-record onboard storage also ensures historical data is preserved locally as a backup, accessible by time-based search even when network connectivity is temporarily unavailable.
The HM-TCMn requires minimal routine maintenance thanks to its solid-state LED light source rated for 100,000 hours and sealed colorimetric cell design. Daily operation involves verifying the instrument's zero point with a blank sample before testing. Periodic calibration verification with standard permanganate solutions is recommended quarterly or after every 500 tests, whichever comes first. The Android system supports remote firmware upgrades, so calibration algorithm improvements and method updates are delivered over-the-air without returning the instrument to the factory. The thermal printer requires only periodic paper roll replacement. Overall, annual professional servicing is sufficient to maintain full specification compliance.
Traditional manual titration for CODMn relies on visual endpoint detection — the operator judges when the pink color of excess permanganate disappears — introducing subjectivity and inter-operator variability. The HM-TCMn replaces visual judgment with photometric detection at precise wavelengths, achieving measurement error of ≤±5% versus the ±10–15% variability typical of manual methods. Each test takes significantly less time since the instrument handles timing, temperature compensation, and calculation automatically. Data is recorded digitally with timestamps, eliminating transcription from lab notebooks. For laboratories processing 20+ samples daily, the HM-TCMn can improve throughput by 3–4x while simultaneously improving data quality and audit readiness.
Article address:https://www.hmwatertesting.cn/permanganate-index-analyzer/permanganate-index-water-quality-monitoring.html
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