OHAUS AB23PH-F Benchtop pH/ORP/Temperature Meter
| Brand | OHAUS |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Manufacturer |
| Origin Category | Domestic |
| Model | AB23PH-F |
| Instrument Type | Benchtop |
| Parameter Type | Single-Parameter (pH) with ORP & Temperature |
| Measurement Accuracy | ±0.01 pH |
| pH Range | 0.00 – 14.00 |
| Resolution | 0.01 pH / 1 mV / 0.1 °C |
| Calibration | Auto-buffer recognition, 2-/3-point calibration |
| Data Storage | 99 readings |
| Display | 5-inch segmented backlit LCD |
| Enclosure | ABS housing with membrane mechanical keys |
| Power | AC adapter |
| Weight | 0.38 kg |
| Dimensions (H×L×W) | 51 × 210 × 142 mm |
| Compliance | Designed for general laboratory use per IEC 61010-1 safety standards |
Overview
The OHAUS AB23PH-F is a dedicated benchtop electrochemical meter engineered for routine pH, oxidation-reduction potential (ORP), and temperature measurements in academic, quality control, and industrial laboratories. It operates on the principle of potentiometric measurement: pH is determined by the Nernst equation-based voltage difference between a glass pH electrode and a reference electrode immersed in the sample, while ORP is measured as the absolute millivolt potential relative to a standard hydrogen electrode (SHE). Temperature compensation is performed automatically using an integrated Pt1000 or thermistor sensor, ensuring thermally corrected readings across 0–100 °C. Designed for reliability in daily operation—not high-throughput or regulated GMP environments—the AB23PH-F delivers consistent ±0.01 pH accuracy and 0.01 pH resolution within the full aqueous pH scale (0.00–14.00), making it suitable for water quality testing, buffer verification, basic fermentation monitoring, and educational labs.
Key Features
- 5-inch segmented backlit LCD display with intuitive icon-driven interface and real-time parameter status indicators
- Membrane-type mechanical keypad with six tactile, labeled buttons—optimized for gloved operation and long-term durability
- Auto-buffer recognition for standard pH 4.01, 7.00, and 10.01 buffers (China-compliant formulations); supports both 2-point and 3-point calibration routines
- Built-in electrode holder with adjustable arm—enables stable probe positioning without external clamps and minimizes benchtop footprint
- Electrode condition indicator provides visual feedback on slope and offset during calibration, aiding troubleshooting and maintenance scheduling
- Non-volatile memory stores up to 99 measurement records with timestamp (date/time not embedded; manual entry required), supporting traceable data capture for internal QA workflows
Sample Compatibility & Compliance
The AB23PH-F is validated for aqueous and low-ionic-strength solutions typical in teaching labs, environmental screening, and preliminary process checks. It is not rated for non-aqueous solvents, high-viscosity slurries, or sterilizable applications. The instrument complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets RoHS Directive 2011/65/EU for hazardous substance restrictions. While it does not include FDA 21 CFR Part 11-compliant audit trail or electronic signature functionality, its calibration log and stored readings may be manually transcribed into GLP-compliant lab notebooks. No ISO/IEC 17025 or ASTM D1293 validation documentation is supplied by default.
Software & Data Management
No proprietary PC software or USB/Bluetooth connectivity is provided. Data export is manual: users record values directly from the LCD screen or transcribe stored entries using the unit’s scroll function. The absence of digital output interfaces aligns with its design intent—as a standalone, low-maintenance meter for environments where paper-based SOPs or secondary data logging (e.g., via LIMS-integrated barcode scanners) are standard practice. Calibration history is retained only in volatile memory during active session; power loss resets calibration status unless re-performed.
Applications
- Classroom instruction in general chemistry and analytical techniques
- Routine pH verification of calibration buffers, cleaning solutions, and rinse water in manufacturing cleanrooms
- Field-deployable bench support for environmental sampling stations (when paired with portable electrodes)
- Monitoring pH stability in small-scale bioreactors or hydroponic nutrient tanks
- Quality assurance checks for incoming raw materials (e.g., acids, bases, salts) prior to batch release
- Calibration verification of handheld pH meters using standardized reference solutions
FAQ
Does the AB23PH-F support automatic temperature compensation (ATC)?
Yes—it accepts input from external ATC probes (e.g., ROSS™ or OHAUS-compatible Pt1000 sensors) and applies NIST-traceable algorithms to correct pH readings based on solution temperature.
Is the meter compatible with international pH buffer standards?
It recognizes Chinese national standard buffers (GB/T 27503) by default; manual calibration with DIN 19266 or NIST SRM buffers is possible but requires disabling auto-recognition.
Can the stored data be exported to a computer?
No—data must be manually recorded. The unit lacks serial, USB, or wireless communication ports.
What electrode types are supported?
Any BNC-input combination pH/ORP electrode with integrated or separate temperature sensor; no proprietary connector system is used.
Is firmware upgrade capability available?
No—firmware is fixed at time of manufacture and not field-upgradable.
