WTW inoLab® pH 7110 Benchtop pH/ORP Meter
| Brand | WTW |
|---|---|
| Origin | Germany |
| Model | pH 7110 |
| Instrument Type | Benchtop |
| Parameter Type | Single-Parameter (pH/ORP/Temperature) |
| Measurement Accuracy | ±0.005 pH (at 0.001 pH resolution) |
| pH Range | –2.000 to +19.999 |
| Resolution | 0.001 pH / 0.1 mV / 0.1 °C |
| Operating Temperature | +5 to +55 °C |
| Storage Temperature | –25 to +65 °C |
| Power Supply | 4 × AA alkaline batteries (2500 h typical life) or 100–240 VAC / 9 VDC adapter |
| Dimensions | 240 × 190 × 80 mm |
| Weight | 1.0 kg |
| Ingress Protection | IP43 |
Overview
The WTW inoLab® pH 7110 is a precision benchtop electrochemical meter engineered for reliable, traceable pH, redox potential (ORP), and temperature measurements in regulated laboratory environments. Based on potentiometric measurement principles—utilizing standardized glass electrode systems and reference junctions—the instrument delivers high reproducibility across diverse aqueous matrices. Its triple-resolution capability (0.1 / 0.01 / 0.001 pH) enables method-specific selection aligned with ISO 10523, ASTM D1293, and USP requirements. Designed for routine QC/QA workflows, the pH 7110 operates without internal memory limitations or proprietary connectivity constraints, supporting manual data recording or integration into validated LIMS via analog output or optional RS232 interface.
Key Features
- Triple-resolution pH measurement (0.1 / 0.01 / 0.001 pH) with selectable accuracy modes per application need
- AutoRead function: real-time stability detection algorithm locks measurement upon signal convergence (±0.002 pH/15 s), minimizing operator-dependent variability
- Automated 1-, 2-, or 3-point calibration with NIST-traceable buffer recognition (pH 4.01, 7.00, 9.21, 10.01); calibration history stored with timestamp and buffer ID
- Rugged IP43-rated housing with chemically resistant, wipe-clean front panel and sealed membrane keyboard—designed for frequent decontamination in GMP/GLP labs
- Extended battery autonomy: up to 2500 hours on standard AA alkaline cells; dual-power architecture supports uninterrupted operation during AC power failure
- Temperature compensation via integrated Pt1000 sensor or manual input (–20 to +130 °C), compliant with DIN 19263 and EN ISO 15839
Sample Compatibility & Compliance
The inoLab® pH 7110 interfaces seamlessly with all DIN/ISO-standard pH and ORP electrodes—including combination, refillable, gel-filled, and low-ionic-strength variants—ensuring compatibility with samples ranging from ultrapure water (conductivity <1 µS/cm) to viscous pharmaceutical suspensions. Electrode diagnostics (asymmetry potential, slope, offset) are displayed pre- and post-calibration to verify sensor integrity. The device meets IEC 61010-1 safety requirements for laboratory electrical equipment and conforms to electromagnetic compatibility standards EN 61326-1. While not inherently 21 CFR Part 11-compliant, its audit-ready calibration logs, user-accessible firmware versioning, and non-erasable measurement timestamps support validation under GLP and GMP frameworks when deployed with documented SOPs.
Software & Data Management
Data handling is optimized for regulatory transparency: each measurement includes embedded metadata (date/time, electrode ID if encoded, calibration status, temperature). No onboard software installation is required; raw values export via RS232 to CSV-compatible terminals or legacy lab notebooks. Optional PC software (WTW LabX® Light) enables batch report generation, trend analysis, and electronic signature-capable PDF archiving—fully compatible with FDA 21 CFR Part 11 when paired with institutional identity management systems. All firmware updates are delivered as signed binaries with SHA-256 checksum verification to ensure integrity.
Applications
The pH 7110 serves as a primary measurement tool across multiple regulated sectors: environmental water quality testing (EPA Method 150.1), pharmaceutical excipient pH verification (ICH Q5C), bioprocess media preparation (USP ), food safety titration endpoint confirmation, and clinical laboratory electrolyte solution QC. Its wide pH range (–2.000 to +19.999) accommodates aggressive caustic or acidic process streams common in chemical synthesis, while the ±0.005 pH accuracy at 0.001 resolution satisfies pharmacopeial specifications for critical formulation steps.
FAQ
Does the pH 7110 support automatic temperature compensation (ATC)?
Yes—it accepts input from integrated Pt1000 sensors or external temperature probes meeting DIN EN 60751 Class B tolerances.
Can calibration data be exported for audit purposes?
Calibration events are timestamped and stored internally with buffer IDs and measured slopes; export requires RS232 connection and terminal software.
Is the instrument suitable for use in humid or splash-prone lab environments?
Its IP43 rating provides protection against vertically falling drops and limited ingress of solid objects, making it appropriate for general wet-lab benches—but not for continuous submersion or pressurized washdown.
What electrode types are compatible with the pH 7110?
All standard BNC-terminated pH and ORP electrodes adhering to DIN 19262 and IEC 60746-2, including double-junction, low-maintenance gel-filled, and specialized low-conductivity models.
How is measurement traceability ensured?
Each unit ships with factory calibration certificate referencing PTB (Physikalisch-Technische Bundesanstalt) standards; users may perform in-house verification using certified reference materials per ISO/IEC 17025 guidelines.
