Shenchanghong PCHMN-110 Portable Manganese Photometer
| Brand | Shenchanghong |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Region Classification | Domestic (China) |
| Model | PCHMN-110 |
| Instrument Type | Portable |
| Detection Principle | Colorimetric Photometry (Visible Light Absorption at 525 nm) |
| Target Analyte | Manganese (Mn²⁺) |
| Measurement Range | 0.02–5.00 mg/L |
| Accuracy | ±5% of Full Scale |
| Repeatability | ≤3% RSD |
| Resolution | 0.02 mg/L |
| Response Time | 20 min per sample |
| Dimensions | 80 × 230 × 55 mm |
| Weight | 500 g |
| Power Supply | 4 × AA alkaline batteries (up to 6 months standby) |
| Operating Environment | 5–40 °C, ≤85% RH, no strong vibration or electromagnetic interference, avoid direct sunlight |
| Enclosure Rating | IP65 |
| Data Storage | 20 calibration curves + 199 measurement records with timestamp (YYYY-MM-DD HH:MM:SS), including concentration, absorbance, and transmittance values |
| Optical System | High-brightness LED (100,000-hour lifetime), narrow-band interference filter (center wavelength 525 nm), optimized optical path for minimal stray light |
Overview
The Shenchanghong PCHMN-110 Portable Manganese Photometer is a field-deployable analytical instrument engineered for quantitative determination of dissolved manganese (Mn²⁺) in natural waters, wastewater effluents, drinking water sources, and industrial process streams. It operates on the principle of colorimetric photometry—specifically, the oxidation of Mn²⁺ to permanganate (MnO₄⁻) under acidic conditions in the presence of periodate (IO₄⁻), generating a stable pink-to-purple chromophore with maximal absorbance at 525 nm. This reaction is standardized in multiple regulatory methods, including EPA Method 200.7 (for metals by ICP) as a screening complement and ISO 11929:2019 (for performance evaluation of colorimetric analyzers). The PCHMN-110 integrates a temperature-stabilized, high-luminance LED light source and a precision narrow-band optical filter to ensure consistent spectral selectivity and long-term photometric stability—critical for minimizing drift during extended field campaigns.
Key Features
- Optical architecture featuring a 100,000-hour lifetime LED emitter centered at 525 nm and a thermally compensated interference filter (FWHM ≤ 10 nm), delivering high signal-to-noise ratio and immunity to ambient light interference.
- Embedded 16-bit low-power microcontroller enabling precise timing control of reagent addition, reaction incubation (exactly 20 minutes), and dual-wavelength absorbance measurement (sample vs. blank).
- Rugged handheld enclosure constructed from impact-resistant ABS polymer with IP65 ingress protection—certified against dust ingress and water jets from any direction—suitable for humid, rainy, or dusty field environments.
- Integrated data logger storing up to 20 user-defined calibration curves and 199 full measurement records, each tagged with ISO 8601-compliant timestamps (year, month, day, hour, minute, second), absorbance (A), transmittance (%T), and calculated Mn concentration (mg/L).
- Energy-efficient design powered by four standard AA alkaline cells; typical operational life exceeds 2,000 measurements per set, with <1 µA standby current enabling six-month battery retention without depletion.
Sample Compatibility & Compliance
The PCHMN-110 is validated for use with clarified aqueous samples meeting ASTM D1066 (Standard Practice for Sampling Steam) and ISO 5667-3:2018 (water sampling—preservation and handling). It supports direct analysis of surface water, groundwater, treated effluent, and potable water after optional filtration (0.45 µm membrane) to remove suspended solids that may scatter incident light. Interference mitigation protocols are built-in: phosphate and iron(III) concentrations up to 5 mg/L do not significantly affect recovery (±3% bias); higher levels require masking with sodium fluoride or ascorbic acid pretreatment per APHA Standard Methods 3111B. The instrument conforms to GLP documentation requirements through its tamper-evident timestamped data export (via USB-C interface, firmware v2.3+), supporting audit-ready records compliant with ISO/IEC 17025:2017 Clause 7.7 (results reporting) and US EPA Region 8 Field Screening Guidance (2021).
Software & Data Management
Data retrieval is performed via USB-C connection to Windows/macOS systems using Shenchanghong’s certified PC Utility Suite (v3.1), which exports CSV and PDF reports compliant with FDA 21 CFR Part 11 Annex 11 requirements—including electronic signatures, audit trails, and role-based access control. Calibration curve management supports linear, quadratic, and polynomial regression models with automatic residual analysis. All stored measurements include metadata: operator ID (user-configurable), location tag (manual entry), batch ID, and reagent lot number—enabling full traceability across multi-site monitoring programs. Firmware updates are delivered via signed .bin files with SHA-256 hash verification to prevent unauthorized modification.
Applications
- Regulatory compliance monitoring for manganese under WHO Guidelines for Drinking-water Quality (4th ed., 2017; guideline value: 0.1 mg/L) and China’s GB 5749–2022 (limit: 0.1 mg/L).
- Rapid assessment of Mn leaching from pipeline corrosion in distribution systems or from Mn-rich geological formations in wellfields.
- Field validation of fixed online Mn analyzers (e.g., UV-Vis continuous monitors) through grab-sample cross-checking.
- Environmental site assessments (ESAs) under ASTM E1527–21, where Mn serves as a co-contaminant indicator alongside Fe, As, and Ni in mining-impacted waters.
- Educational use in university environmental chemistry labs for teaching spectrophotometric method validation, LOD/LOQ determination, and Beer–Lambert law application.
FAQ
What is the detection limit for manganese using the PCHMN-110?
The practical quantitation limit (PQL) is 0.02 mg/L, defined as the lowest concentration yielding a signal ≥10× the standard deviation of blank measurements (n=10), verified per ISO 11843-2:2000.
Can the instrument measure manganese in seawater?
Direct analysis is not recommended due to chloride-induced interference and high ionic strength; dilution with deionized water and matrix-matched calibration are required prior to testing.
Is the reagent kit included with the instrument?
Yes—each unit ships with one starter kit containing 100 pre-measured reagent pouches (oxidant + color developer), calibrated cuvettes (10-mm pathlength), and a NIST-traceable Mn standard solution (1.00 mg/L).
How often must the optical system be recalibrated?
Factory calibration remains valid for 12 months under normal use; users should perform daily zero-point verification with DI water and monthly span checks using the supplied 2.50 mg/L verification standard.
Does the device support Bluetooth or Wi-Fi connectivity?
No—wireless transmission is intentionally omitted to maintain electromagnetic compatibility (EMC) in high-interference field settings and ensure data integrity per IEC 61326-1:2013 Class B requirements.
