PoolDirect UV-Vis Photometer

Overview

The PoolDirect UV-Vis Photometer is a purpose-engineered, multi-parameter photometric analyzer designed specifically for routine water quality monitoring in swimming pools, spas, and recreational water facilities. Operating on the principle of fixed-wavelength absorbance photometry, it employs three precision interference filter-based optical channels (530 nm, 560 nm, and 610 nm) with ±5 nm bandwidths to quantify key chemical parameters—including free chlorine, total chlorine, bromine, pH (via indicator-based colorimetry), cyanuric acid, and alkalinity—according to internationally harmonized test methods. Its optical architecture integrates temperature-compensated high-stability LEDs, an internal reference channel, and a built-in photodiode within the sample cuvette holder to ensure signal stability across ambient temperature fluctuations (5–40 °C). The instrument complies with DIN EN ISO/IEC 17025 requirements for calibration traceability and supports method validation under GLP-aligned operational protocols.

Key Features

• Triple-wavelength photometric detection using narrow-band interference filters (530 nm, 560 nm, 610 nm) with spectral bandwidths of ≤6 nm for selective analyte quantification
• Integrated temperature compensation for LED light sources and optical path to maintain measurement reproducibility across 5–40 °C operating range
• High-contrast backlit LCD display with multilingual interface (English, German, French, Spanish, Italian) and intuitive icon-driven navigation
• Corrosion-resistant capacitive touch keypad with audible feedback for operation in humid, chlorinated environments
• Onboard data storage for up to 1,000 measurement records, each timestamped with date, time, and sequential ID for audit-ready traceability
• RS232 serial interface for direct connection to printers, laboratory information systems (LIS), or PCs for data export and remote configuration
• Automatic self-diagnostic sequence initiated at power-on, verifying LED output, photodiode response, and battery status
• Auto-power-off after ~20 minutes of inactivity to extend battery life and conserve energy

Sample Compatibility & Compliance

The PoolDirect Photometer accepts standard 10 mm square or round glass/plastic cuvettes and is optimized for use with EPA-compliant, ISO 7027-aligned reagent kits for pool water analysis. It supports pre-programmed methods aligned with DIN 19643, NSF/ANSI 50, and EN 15358 standards for recreational water quality control. CE marking confirms conformity with EU Directive 2014/30/EU (EMC) and 2014/35/EU (LVD). While not intended for pharmaceutical or clinical diagnostics, its measurement uncertainty profile meets typical requirements for environmental compliance testing under ISO 8466-1 for calibration curve linearity and ISO 5725 for repeatability assessment.

Software & Data Management

Firmware and method libraries are updatable via Internet-connected PC using dedicated Windows-compatible configuration software. Updates include new regulatory-compliant test protocols, language packs, and calibration verification routines. All stored measurements support CSV export via RS232 for integration into LIMS or Excel-based QA/QC reporting workflows. Audit trail functionality logs user-initiated actions (e.g., calibration, method selection, data deletion), satisfying basic documentation requirements for facility-level GLP adherence. No cloud storage or remote access capabilities are embedded; data sovereignty remains fully under end-user control.

Applications

• Routine daily monitoring of free/total chlorine and bromine residual in commercial and municipal swimming pools
• Verification of cyanuric acid stabilization levels to prevent UV degradation of disinfectants
• Colorimetric estimation of total alkalinity and pH using standardized indicator reagents
• Compliance verification against local health authority mandates (e.g., German TRBA 220, UK PWTAG guidelines)
• Preventive maintenance logging for water treatment equipment based on trending parameter deviations
• Staff training and on-site verification during third-party hygiene audits

FAQ

Is the PoolDirect Photometer suitable for drinking water analysis?
No—it is calibrated and validated exclusively for recreational water matrices per DIN 19643 and NSF/ANSI 50; drinking water applications require instruments compliant with ISO 9001-certified methods and EPA Method 334.1 validation.
Can the device be recalibrated by the end user?
Yes—zero and span calibration is supported using supplied blank solutions and certified reference standards; full optical recalibration requires authorized service center intervention.
Does the instrument meet FDA 21 CFR Part 11 requirements?
No—while it provides timestamped data storage and user-action logging, it lacks electronic signature capability, audit trail encryption, and system validation documentation required for regulated pharmaceutical or clinical use.
What is the expected lifetime of the LED light sources?
The triple-LED array is rated for ≥100,000 measurements under normal usage conditions, with output stability monitored continuously via the internal reference channel.
Is battery replacement possible in the field?
Yes—the rechargeable NiMH AA battery pack (7 cells) is user-replaceable without tools; full charge supports ≥8 hours of continuous operation or ~2,000 measurements per cycle.