Lamotte DC1500 Residual Chlorine Colorimeter

Overview

The Lamotte DC1500 Residual Chlorine Colorimeter is a field-deployable, laboratory-grade photometric analyzer engineered for precise quantification of free and total residual chlorine in drinking water, wastewater, swimming pools, and process water systems. Based on the standardized DPD (N,N-diethyl-p-phenylenediamine) colorimetric method, the instrument operates at a fixed wavelength optimized for chlorine-DPD complex absorbance—ensuring compliance with U.S. Environmental Protection Agency (EPA) Method 330.5 and Standard Methods for the Examination of Water and Wastewater 4500-Cl. Its optical architecture integrates a high-stability LED light source and a narrow-bandwidth (10 nm) interference filter to minimize spectral interference from turbidity, colored organics, or oxidant cross-reactivity—critical for regulatory-grade measurements under real-world sample conditions.

Key Features

• IP67-rated rugged enclosure for full dust ingress protection and submersion resistance up to 1 meter for 30 minutes—enabling reliable operation in outdoor, industrial, or emergency response environments.
• Rechargeable lithium-ion battery (3.7 V) with USB and AC adapter charging options—eliminating disposable battery dependency and supporting extended field campaigns without logistical overhead.
• Large 160 × 100-pixel backlit LCD display with dual-mode output: numeric concentration (ppm) and graphical intensity trace—facilitating rapid visual verification of assay validity and signal stability.
• Six-button intuitive interface with dedicated function keys for zeroing, calibration, measurement, data recall, and menu navigation—designed for glove-compatible use and minimal operator training.
• Sealed, contamination-resistant sample chamber accommodating standard 25 mm flat-bottom cuvettes; integrated lid prevents ambient light leakage and accidental spillage during analysis.
• Pre-programmed chlorine test protocols—including separate modes for free chlorine, total chlorine, and low-range (0–0.5 ppm) applications—aligned with EPA-approved methodologies and validated against NIST-traceable standards.

Sample Compatibility & Compliance

The DC1500 accepts both tablet-based (Cat. No. 3240 / R-3240) and liquid reagent formats (Cat. No. 3240-LI / R-3240-LI), each formulated to meet EPA-recommended DPD reaction kinetics and stoichiometry. The system is validated for aqueous matrices with turbidity ≤ 5 NTU and pH 6.2–8.0—conditions typical of municipal distribution systems and recreational water facilities. Regulatory alignment includes full conformance with the National Primary Drinking Water Regulations (NPDWR), National Pollutant Discharge Elimination System (NPDES) reporting requirements, and GLP-compliant data integrity expectations when used with optional audit-trail-enabled software. CE marking confirms conformity with EU Electromagnetic Compatibility (EMC) Directive 2014/30/EU and RoHS 2011/65/EU.

Software & Data Management

A Windows-compatible data management application is available as an optional accessory, enabling secure transfer, time-stamped storage, and export of measurement records in CSV or PDF formats. The software supports user-defined ID fields, instrument serial tracking, and configurable report templates compliant with ISO/IEC 17025 documentation requirements. When deployed in regulated environments, the system supports 21 CFR Part 11-compliant electronic signatures and audit trails—including operator login history, parameter modification logs, and calibration event timestamps—meeting FDA and accredited laboratory quality system expectations.

Applications

• Drinking water treatment plant effluent monitoring per EPA 330.5 and State primacy program mandates.
• Wastewater disinfection validation prior to discharge under NPDES permit conditions.
• Swimming pool and spa facility daily residual chlorine verification per CDC Model Aquatic Health Code (MAHC).
• Field verification of point-of-use (POU) and point-of-entry (POE) chlorination systems during commissioning or maintenance.
• Emergency response water safety screening following natural disasters or infrastructure failures.
• Educational laboratories conducting method validation exercises aligned with Standard Methods 4500-Cl and APHA guidelines.

FAQ

What chlorine species does the DC1500 measure?
The instrument measures both free residual chlorine (hypochlorous acid and hypochlorite ion) and total residual chlorine (free + combined chloramines), depending on reagent selection and protocol configuration.
Is calibration required before each use?
A single-point zero calibration using deionized water is recommended before initiating a test sequence; factory-calibrated slope values are retained in non-volatile memory and do not require routine recalibration unless hardware service is performed.
Can the DC1500 be used for seawater or brackish water samples?
While not validated for high-salinity matrices (>5,000 mg/L TDS), the instrument may yield acceptable results for estuarine or desalination plant pre-chlorination checks—provided samples are filtered to <5 NTU and pH-adjusted to 7.0–7.4 prior to analysis.
How is data security ensured during USB transfer?
The Mini-USB interface operates in mass-storage mode only; no driver installation or system-level access is required. All exported files are plain-text or PDF—no proprietary encryption or vendor-locked formats are employed.
Does the device support multi-language operation out-of-the-box?
Yes—the firmware includes seven embedded language packs (English, Spanish, French, German, Italian, Portuguese, and Simplified Chinese), selectable via the main menu without firmware updates or external configuration tools.