CLEAN PH200 Portable pH Meter

Overview

The CLEAN PH200 Portable pH Meter is a field-deployable, high-reliability electrochemical instrument engineered for precise and repeatable measurement of hydrogen ion activity (pH), redox potential (mV), and temperature in aqueous solutions. Based on potentiometric principle using a glass pH electrode and reference electrode pair, the PH200 employs a high-impedance input amplifier (>10¹² Ω) to minimize loading error and ensure stable readings across diverse sample matrices—including low-conductivity surface water, industrial process streams, and laboratory-prepared standards. Designed for rugged daily use outside controlled lab environments, its architecture integrates environmental resilience with metrological rigor—meeting core functional expectations of ISO 8655-compliant portable pH instrumentation while supporting traceable calibration practices aligned with ASTM D1293 and EPA Method 150.1.

Key Features

• IP67-rated enclosure with buoyant housing design—fully dust-tight and submersible up to 1 m for 30 minutes; validated for outdoor, wastewater, and marine fieldwork.
• 65 × 40 mm backlit LCD display with multi-line layout—optimized for legibility under direct sunlight or low-light conditions.
• Three-point automatic calibration (zero offset, acidic slope, alkaline slope) using NIST-traceable buffer sets (e.g., pH 4.01, 7.00, 10.01) to correct nonlinearity and electrode drift.
• Real-time status review function: one-button access to electrode diagnostics—including zero offset, slope %, asymmetry potential, and active calibration parameters.
• HOLD function for freezing unstable readings during manual sampling; auto-hold triggered at signal stabilization (±0.01 pH/10 sec).
• Internal data logger stores up to 50 measurement records with timestamp, pH/mV/°C values, and calibration metadata—exportable via optional USB interface (not included).
• User-configurable auto-power-off (10 min default) to extend battery life without compromising operational readiness.
• Powered by two AAA alkaline cells—rated for >500 hours of continuous operation under typical field usage (backlight off, auto-off enabled).
• Compact ergonomic form factor (94 × 190 × 35 mm, 250 g) with integrated carrying handle and CP337 protective case for transport and storage.

Sample Compatibility & Compliance

The PH200 is validated for use with aqueous samples having conductivity ≥50 µS/cm and temperature between –10.0 °C and 110.0 °C. It supports routine analysis of drinking water, surface water, effluent, cooling tower fluids, and mild chemical process streams. Electrode compatibility includes standard combination pH electrodes (BNC connector, Ag/AgCl reference system). The instrument complies with IEC 61010-1 safety requirements for portable electrical equipment and meets electromagnetic compatibility (EMC) standards per IEC 61326-1 (industrial environment). Calibration traceability aligns with ISO/IEC 17025 documentation practices when used with certified reference materials.

Software & Data Management

While the PH200 operates as a standalone instrument without embedded Bluetooth or Wi-Fi, its stored datasets can be manually transcribed or transferred via optional serial-to-USB adapter (CLEAN USB-ADP1) and companion PC software (CLEAN DataLink v2.1). The software enables CSV export, calibration history archiving, and basic statistical reporting (mean, SD, min/max)—supporting GLP-compliant recordkeeping where audit trails and user authentication are implemented at the host system level. Firmware updates are performed via proprietary service utility; no end-user firmware modification is permitted.

Applications

• Environmental monitoring: field verification of pH in rivers, lakes, wetlands, and groundwater wells per USGS NWIS protocols.
• Industrial QA/QC: real-time pH verification in food & beverage production lines, pharmaceutical water systems (PW, WFI), and electroplating baths.
• Educational laboratories: undergraduate chemistry and environmental science courses requiring robust, student-safe instrumentation.
• Wastewater treatment: rapid assessment of influent/effluent acidity prior to titration or sensor network integration.
• Aquaculture and hydroponics: routine nutrient solution monitoring where temperature-compensated pH stability is critical.

FAQ

What calibration buffers are supported?
The PH200 accepts two pre-programmed buffer sets: Set A (pH 4.00, 6.86, 9.18) and Set B (pH 4.01, 7.00, 10.01), both traceable to NIST Standard Reference Materials.
Does the instrument support automatic temperature compensation (ATC)?
Yes—integrated Pt1000 thermistor provides continuous temperature measurement and applies standardized Nernstian correction (–0.1984 mV/pH/°C at 25 °C) to pH readings.
Can the PH200 measure ORP (oxidation-reduction potential)?
Yes—it measures mV in the range –2000 to +2000 mV with 1 mV resolution and ±0.2% F.S. accuracy, suitable for redox monitoring in disinfection or corrosion control applications.
Is the device compliant with FDA 21 CFR Part 11?
No—the PH200 does not include electronic signatures, audit trail logging, or role-based access control; it is intended for non-GMP field screening and preliminary analysis only.
How often should calibration be performed?
Calibration frequency depends on application stringency: daily for regulated environmental testing, before each batch in QC labs, or per manufacturer-recommended intervals (typically every 2–4 hours during continuous field use).