Orion Star A121 Portable pH Meter
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | Orion Star A121 |
| Pricing | Upon Request |
Overview
The Orion Star A121 Portable pH Meter is a field-deployable, battery-powered electrochemical instrument engineered for reliable and traceable pH and mV measurements in diverse environmental, industrial, and quality control settings. Built on a robust potentiometric measurement principle—utilizing the Nernst equation to quantify hydrogen ion activity—the A121 delivers high reproducibility across aqueous samples with minimal operator dependency. Its compact, handheld architecture integrates a dual-sensor interface (BNC for pH electrodes and 8-pin mini-DIN for automatic temperature compensation probes), enabling simultaneous real-time display of pH or redox potential (mV/RmV), temperature, electrode status, battery level, and calibration diagnostics. Designed for compliance-critical workflows, the meter supports manual and automatic temperature compensation (ATC), one-point temperature calibration, and adherence to standard buffer recognition protocols (USA, NIST, and DIN), ensuring metrological consistency aligned with ISO/IEC 17025–recommended practices for field instrumentation.
Key Features
- IP67-rated enclosure for dust-tight and immersion-resistant operation (up to 1 m for 30 min), validated per IEC 60529 standards
- AUTO-READ™ intelligent stabilization algorithm that locks readings upon signal convergence and displays visual stability indicators
- Large backlit LCD with intuitive icon-driven interface: shows pH/mV, temperature, battery status, electrode health, calibration progress, and contextual on-screen prompts
- Three-point pH calibration with buffer auto-recognition and full calibration report review (including slope, offset, and isopotential point)
- Dual power options: 4 × AA alkaline batteries (rated for up to 2000 hours of continuous operation) or universal AC adapter (100–240 V AC input)
- Integrated RmV (relative mV) mode with ±1999.9 mV range and ±0.1 mV accuracy for reference-electrode–based redox assessments
Sample Compatibility & Compliance
The Orion Star A121 is optimized for routine analysis of aqueous solutions across laboratory, wastewater, food processing, aquaculture, and educational applications. It accepts all standard BNC-compatible pH electrodes—including combination pH/ATC sensors such as the included 9107BNUMD—and supports both manual and automatic temperature compensation over a validated range of –5 to 105 °C. The instrument complies with essential electrical safety standards (IEC 61010-1) and electromagnetic compatibility requirements (IEC 61326-1). While not FDA 21 CFR Part 11–enabled by default, its audit-ready calibration logs and non-editable measurement records (with timestamped entries) support GLP/GMP-aligned documentation practices when used in conjunction with controlled procedural SOPs.
Software & Data Management
Data handling is streamlined via onboard memory storing up to 50 measurement records—configurable for manual or time-stamped automatic logging. Each entry includes pH/mV value, temperature, date/time stamp, and electrode ID (if encoded). Users may perform last-entry deletion or full memory reset without data export capability; external data transfer requires optional Orion Star Com software (v3.0+) and USB-to-mini-B cable (sold separately). All stored records retain immutable metadata, supporting traceability for internal QA audits and method validation under ISO 9001 or ASTM D1293 (Standard Test Method for pH of Water).
Applications
- Field-based water quality monitoring (surface water, groundwater, effluent streams)
- In-process pH verification during beverage, dairy, and pharmaceutical manufacturing
- Educational laboratories requiring rugged, student-safe instrumentation with clear visual feedback
- Environmental site assessments where portability, battery longevity, and ingress protection are critical
- Calibration verification and electrode performance trending using stored calibration history
FAQ
What buffer standards does the Orion Star A121 recognize automatically?
It identifies and applies correction factors for USA (pH 4.01, 7.00, 10.01), NIST (pH 4.01, 6.86, 9.18), and DIN (pH 1.68, 4.01, 6.86, 9.18) buffer sets.
Can the instrument store calibration data for multiple electrodes?
No—it retains only the most recent calibration set; however, calibration reports can be manually documented for electrode-specific tracking.
Is temperature calibration required before each use?
A single-point temperature calibration is recommended during initial setup or after probe replacement, but not before every measurement.
Does the A121 support GLP-compliant data integrity requirements?
While lacking electronic signature or audit trail features native to regulated environments, its fixed-record structure, timestamping, and non-modifiable storage align with foundational GLP principles for field instruments.
What is the warranty coverage for the Orion Star A121?
Thermo Fisher Scientific provides a standard 2-year limited warranty covering parts and labor for defects in materials and workmanship under normal use conditions.
