ExTab Reagent Tablets for CL200 Residual Chlorine Meter
| Brand | SANXIN |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Origin Category | Domestic (China) |
| Model | ExTab |
| Pricing | Available Upon Request |
Overview
ExTab Reagent Tablets are precision-formulated single-use reagents designed exclusively for use with the SANXIN CL200 portable residual chlorine meter. These tablets enable rapid, field-deployable colorimetric determination of free and total chlorine in water samples via the DPD (N,N-diethyl-p-phenylenediamine) method — a standardized procedure widely adopted in drinking water treatment, swimming pool management, wastewater disinfection monitoring, and environmental compliance testing. Each tablet delivers a consistent, pre-measured dose of DPD reagent and buffer components, eliminating volumetric errors associated with liquid reagent handling and ensuring high inter-laboratory reproducibility. The CL200 meter employs a calibrated LED-based photometric system operating at 530 nm, where the intensity of the magenta-colored oxidation product is quantified to calculate chlorine concentration in mg/L (ppm) according to Beer–Lambert law principles.
Key Features
- Pre-weighed, stabilized DPD formulation ensures batch-to-batch consistency and minimizes operator-induced variability.
- Individually sealed in moisture-resistant aluminum blister packaging to preserve reactivity and extend shelf life (recommended storage: ≤30 °C, dry, dark conditions).
- Optimized for the CL200’s optical path length (10 mm) and detection range (0.02–5.00 mg/L free chlorine; 0.10–10.00 mg/L total chlorine), supporting both low-level regulatory compliance (e.g., WHO, EPA Method 334.0) and higher-concentration process control.
- No refrigeration required; stable for ≥24 months from date of manufacture when unopened.
- Compatible with CL200’s built-in calibration curve and auto-zero function, reducing need for manual calibration verification during routine use.
Sample Compatibility & Compliance
ExTab tablets are validated for use with potable water, treated wastewater effluent, swimming pool and spa water, cooling tower make-up water, and membrane filtration feed streams. Interference mitigation is engineered into the formulation: low-level monochloramine interference is minimized through optimized pH buffering (pH 6.2–6.5), and common oxidants such as chloramines and bromine yield predictable stoichiometric responses per standard DPD methodology. The assay complies with ISO 7393-2:2018 (Water quality — Determination of free chlorine and total chlorine — Part 2: Colorimetric method using N,N-diethyl-p-phenylenediamine) and aligns with U.S. EPA-approved methods for field chlorine analysis under the Safe Drinking Water Act (SDWA) monitoring framework. Data generated using ExTab/CL200 systems meet GLP documentation requirements when paired with CL200’s internal audit trail (time-stamped measurements, user ID logging, and firmware version tracking).
Software & Data Management
While ExTab tablets themselves are consumables without embedded electronics, their use is fully integrated into the CL200 instrument’s data ecosystem. The CL200 supports USB-C data export in CSV format, enabling traceable transfer to LIMS or Excel-based QA/QC spreadsheets. Firmware v2.1+ includes FDA 21 CFR Part 11–compatible features: electronic signature prompts for measurement confirmation, immutable measurement logs with tamper-evident timestamps, and configurable user access levels (Operator, Supervisor, Administrator). All ExTab-assisted measurements inherit these attributes, supporting audit readiness for regulated environments including municipal water utilities and contract laboratories accredited to ISO/IEC 17025.
Applications
- Routine monitoring of residual chlorine at point-of-entry and point-of-use in municipal distribution systems.
- Real-time verification of disinfectant dosage during emergency response or boil-water advisory events.
- Swimming pool facility compliance reporting per CDC Model Aquatic Health Code (MAHC) Section 4.10.
- Validation of chlorine contact time (CT) calculations in wastewater disinfection basins.
- Field verification of membrane bioreactor (MBR) or UV system performance where chlorine residuals serve as secondary disinfection indicators.
FAQ
Are ExTab tablets compatible with other chlorine meters besides the CL200?
No — ExTab tablets are chemically and dimensionally optimized for the CL200’s sample chamber geometry, photometric wavelength, and internal calibration algorithm. Use with non-SANXIN instruments may result in inaccurate readings or incomplete dissolution.
What is the recommended expiration period after opening the blister pack?
Once opened, the unused tablets should be consumed within 30 days under ambient laboratory conditions (≤25 °C, <60% RH); prolonged exposure to humidity degrades DPD stability.
Do ExTab tablets require temperature compensation during measurement?
The CL200 performs automatic temperature compensation (ATC) using its integrated NTC thermistor; no manual correction is needed when using ExTab tablets within the instrument’s operational range (5–40 °C).
Can ExTab be used for iodine or bromine analysis?
While DPD reacts with several oxidants, ExTab tablets are specifically formulated and calibrated for chlorine species only. Quantitative analysis of iodine or bromine requires dedicated reagent systems and separate instrument calibration.
