CLEAN PH500 Benchtop pH Meter
| Brand | CLEAN |
|---|---|
| Origin | USA |
| Model | PH500 |
| pH Range | -2.00 to 16.00 |
| Resolution (pH) | 0.01 pH |
| Accuracy (pH) | ±0.2% F.S. |
| mV Range | -2000 to +2000 mV |
| Resolution (mV) | 1 mV |
| Accuracy (mV) | ±0.2% F.S. |
| Temperature Range | -10.0 to 110.0 °C |
| Resolution (Temp) | 0.1 °C |
| Accuracy (Temp) | ±0.2 °C |
| Calibration | Auto 3-point with selectable buffer sets (e.g., 4.00/6.86/9.18 or 4.01/7.00/10.01) |
| Data Storage | 50 readings |
| Auto Power-Off | After 10 min idle |
| Dimensions | 140 × 210 × 35 mm (W×L×H) |
| Weight | 650 g |
| Operating Environment | -5 to 60 °C, <90% RH |
Overview
The CLEAN PH500 Benchtop pH Meter is a precision electrochemical instrument engineered for reliable, repeatable pH, mV, and temperature measurements in regulated laboratory, industrial process control, and educational environments. Based on potentiometric measurement principles, the PH500 detects the voltage difference between a pH-sensitive glass electrode and a stable reference electrode—converted via Nernst equation calculation into pH values traceable to international standard buffer solutions. Its compact footprint (140 × 210 × 35 mm) and robust benchtop architecture make it suitable for space-constrained QC labs, pilot-scale production lines, and teaching laboratories where operational consistency and ease of validation are critical. Designed and assembled in the United States, the instrument complies with fundamental electrical safety requirements per UL/CSA 61010-1 and meets EMC immunity standards appropriate for non-medical laboratory instrumentation.
Key Features
- Three-point automatic calibration with dual buffer set support (e.g., ASTM-traceable 4.00/6.86/9.18 or ISO 3696 Grade 2-compatible 4.01/7.00/10.01), enabling full-range linearity verification across acidic, neutral, and alkaline domains
- Real-time display of calibration parameters—including zero offset (asymmetry potential) and slope (% recovery), allowing immediate assessment of electrode health and adherence to USP and EP 2.2.3 guidelines
- High-contrast backlit LCD with 0.01-pH resolution and simultaneous pH/mV/°C readout—optimized for ambient light variability in factory floors and multi-user academic settings
- Detachable electrode holder with orthogonal 90° alignment mechanism, mountable on either left or right side of the base unit to accommodate diverse probe geometries and immersion depth requirements
- Non-volatile memory storing up to 50 measurement records with timestamp (date/time not embedded; user-entered metadata supported via external documentation)
- Programmable auto-power-off after 10 minutes of inactivity—reducing energy consumption and extending battery life when used with optional AC adapter
Sample Compatibility & Compliance
The PH500 interfaces with standard BNC-compatible pH electrodes (including double-junction, gel-filled, and refillable types) and Pt1000 or thermistor-based temperature sensors. It supports aqueous samples within viscosity limits typical of routine water analysis, wastewater effluents, buffer solutions, and mild chemical process streams (pH –2.00 to 16.00). While not certified for hazardous area use (e.g., ATEX/IECEx), its design conforms to general-purpose laboratory equipment classifications under IEC 61326-1 for electromagnetic compatibility. The instrument’s calibration traceability aligns with ISO/IEC 17025–recommended practices for pH metrology, and its performance specifications meet minimum criteria outlined in ASTM D1293 (Standard Test Method for pH of Water) and EPA Method 150.1.
Software & Data Management
The PH500 operates as a standalone instrument without proprietary software dependency. All calibration coefficients, measurement data, and user-configurable settings (e.g., temperature compensation mode: ATC/MTC) are retained in internal EEPROM. Data export requires manual transcription or integration via analog output (0–20 mA or 4–20 mA optional module, sold separately) into SCADA or LIMS platforms. Audit trail functionality is not embedded; however, the device supports GLP-compliant workflows when paired with controlled documentation procedures—including dated calibration logs, electrode maintenance records, and environmental condition monitoring per ISO 17025 Clause 7.7.
Applications
- Environmental monitoring: Surface water, groundwater, and wastewater pH profiling per EPA and EU WFD requirements
- Pharmaceutical manufacturing: In-process testing of purified water (PW) and water for injection (WFI) per USP and Ph. Eur. 2.2.3
- Food & beverage QA: Batch verification of acidified products, dairy processing streams, and cleaning-in-place (CIP) rinse solutions
- Academic instruction: Undergraduate chemistry and environmental science labs emphasizing electrode theory, calibration uncertainty, and Nernstian behavior
- Industrial pretreatment: Monitoring of boiler feedwater, cooling tower cycles, and electroplating bath stability
FAQ
Does the PH500 support GLP audit trails or electronic signatures?
No—the PH500 does not include built-in electronic signature capability or time-stamped audit logging. Compliance with 21 CFR Part 11 requires external documentation systems and procedural controls.
Can I use non-CLEAN electrodes with this meter?
Yes—any standard BNC-output pH electrode meeting ANSI/ISA-5.1 signal compatibility is functionally interoperable.
What temperature sensor types are supported?
The PH500 accepts integrated or separate temperature probes with Pt1000, 10 kΩ NTC, or built-in thermistor outputs compatible with automatic temperature compensation (ATC) circuitry.
Is firmware upgrade available?
Firmware updates are not field-upgradable; units ship with final production firmware version verified per IEC 62304 Class B software lifecycle requirements.
How is calibration verification performed between scheduled intervals?
Users should verify calibration daily using at least one secondary check buffer (e.g., 7.00 pH) prior to sample measurement, per ISO/IEC 17025 Clause 7.7.1 guidance on intermediate checks.
