OHAUS Starter 5000/F Benchtop pH Meter

Overview

The OHAUS Starter 5000/F Benchtop pH Meter is a high-precision, multi-parameter electrochemical analyzer engineered for routine and advanced laboratory applications requiring strict adherence to Good Laboratory Practice (GLP) standards. Utilizing potentiometric measurement principles based on the Nernst equation, the instrument delivers traceable, reproducible pH, redox potential (ORP/mV), and temperature measurements across an extended operational range. Its design integrates a calibrated 30 kΩ NTC temperature sensor for automatic temperature compensation (ATC), ensuring thermally robust pH determinations in aqueous and non-aqueous media. The device supports both standard two-point and advanced nine-point calibration protocols, accommodating complex sample matrices and regulatory workflows in quality control, environmental testing, pharmaceutical development, and academic research laboratories.

Key Features

• 4.3-inch full-color capacitive touchscreen interface with intuitive icon-driven navigation—enabling one-touch access to measurement, calibration, data review, and system configuration.
• IP54-rated enclosure constructed from impact-resistant ABS housing, paired with a transparent protective cover for enhanced durability in humid, splash-prone, or chemically active lab environments.
• Dedicated electrode stand with adjustable arm and integrated cable management—designed to minimize mechanical stress on pH sensors and improve positional repeatability during sequential measurements.
• Multi-mode endpoint detection including auto-hold, timed-hold, and slope-based stabilization—optimized for viscous, low-conductivity, or unstable samples where conventional endpoint algorithms may yield inconsistent results.
• Comprehensive GLP data logging: each stored reading includes timestamp, operator ID (user-definable), electrode ID, calibration history, temperature, and measurement mode—fully traceable and exportable via RS232 or USB.
• Configurable buffer sets: eight pre-programmed USA/NIST-compatible buffer groups plus one fully customizable set—supporting ISO 3696 Grade 2 water verification, USP , and ASTM E70-compliant calibration procedures.

Sample Compatibility & Compliance

The Starter 5000/F is validated for use with standard glass-body combination electrodes (e.g., OHAUS ST350, included), refillable double-junction probes, and specialized sensors for low-ionic-strength or high-sodium-error applications. It meets the electrical safety requirements of IEC 61010-1 and complies with electromagnetic compatibility standards per IEC 61326-1. For regulated environments, the instrument supports audit-trail-enabled operation under FDA 21 CFR Part 11 when used with compliant data management software—providing electronic signature capability, user access levels, and immutable record retention. All calibration and measurement records adhere to ISO/IEC 17025 documentation requirements for accredited testing laboratories.

Software & Data Management

Data export is supported via native ASCII text format over RS232 (with optional OHAUS PC Connect software) or USB mass-storage mode—requiring no proprietary drivers. Exported files include header metadata (instrument ID, firmware version, date/time stamp) and tab-delimited measurement rows compatible with LIMS integration, Excel analysis, or statistical process control (SPC) platforms. Internal memory retains up to 1000 complete measurement entries with full GLP metadata; automatic overwrite protection prevents accidental deletion of untransferred records. Firmware updates are performed via USB drive using signed binary packages—ensuring integrity and version traceability in GxP environments.

Applications

This meter serves critical functions across diverse sectors: monitoring pH stability in cell culture media and bioreactor feed streams; validating cleaning-in-place (CIP) rinse endpoints in food & beverage production; verifying buffer preparation accuracy per USP monographs; conducting titration endpoint confirmation in analytical chemistry labs; assessing corrosion inhibitor efficacy in industrial cooling water systems; and performing environmental water quality assessments per EPA Method 150.1. Its extended pH range (-2.00–20.00) enables reliable measurement in strongly acidic digestates, alkaline scrubber solutions, and electrolyte formulations where conventional meters exhibit drift or electrode poisoning.

FAQ

What calibration standards are supported by the Starter 5000/F?
The instrument natively supports USA/NIST-traceable pH buffers (e.g., 4.01, 7.00, 10.01 at 25 °C) and allows user-defined buffer values for non-standard or proprietary reference solutions.
Is automatic temperature compensation (ATC) mandatory for pH measurement?
ATC is enabled by default and highly recommended; however, manual temperature entry is available for fixed-temperature bath applications or when using non-NTC temperature probes.
Can the device store calibration curves separately for multiple electrodes?
Yes—up to ten unique electrode profiles can be saved, each retaining individual slope, offset, and calibration history for traceable sensor lifecycle management.
Does the Starter 5000/F meet FDA 21 CFR Part 11 requirements out-of-the-box?
The hardware supports Part 11 functionality (audit trail, electronic signatures, role-based access); full compliance requires implementation of validated third-party data management software and documented SOPs.
What is the maximum allowable ambient humidity for continuous operation?
The unit is rated for continuous use at ≤85% relative humidity (non-condensing) within 10–40 °C ambient temperature range, per IEC 60529 IP54 specifications.