Orion Star A113 Benchtop Dissolved Oxygen Meter
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | Orion Star A113 |
| Pricing | Upon Request |
Overview
The Orion Star A113 Benchtop Dissolved Oxygen Meter is an engineered solution for precise, reliable, and repeatable dissolved oxygen (DO) measurements in laboratory and quality control environments. Utilizing a Clark-type polarographic sensor principle, the instrument measures oxygen partial pressure via electrochemical reduction at a noble metal cathode, generating a current proportional to dissolved O₂ concentration. This fundamental electrochemical architecture ensures high stability, low drift, and robust performance across diverse aqueous matrices—including freshwater, wastewater, effluent streams, and process water used in pharmaceutical manufacturing, environmental monitoring, and academic research. Designed for benchtop deployment, the A113 integrates temperature compensation, atmospheric pressure correction, and salinity adjustment to deliver accurate mg/L and % saturation readings per standardized methods such as ASTM D888 and ISO 5814. Its IP54-rated enclosure provides protection against dust ingress and incidental water splashes—meeting operational requirements for controlled lab settings where routine calibration and sample handling occur.
Key Features
- Large backlit LCD display showing simultaneous DO concentration (mg/L or % saturation), temperature (°C), battery status, calibration status, and real-time AUTO-READ™ stabilization indicator
- AUTO-READ™ function automatically locks measurement values upon signal stabilization, eliminating subjective judgment of endpoint stability
- Dual power options: universal AC adapter (100–240 V AC) or four AA alkaline batteries (up to 2000 hours of continuous operation)
- Polarographic DO probe interface via 9-pin mini-DIN connector, compatible with Thermo Scientific Orion 083005MD membrane-covered sensor
- Integrated temperature measurement with automatic compensation (0–50 °C range, ±0.1 °C accuracy) and optional manual temperature calibration
- Atmospheric pressure compensation (450.0–850.0 mmHg) and salinity correction (0–45 ppt) to meet regulatory reporting requirements for field-referenced data
- IP54-rated housing for dust resistance and protection against low-pressure water jets—suitable for shared laboratory workbenches
Sample Compatibility & Compliance
The Orion Star A113 is validated for use with aqueous samples meeting standard environmental and industrial water quality criteria. It supports calibration using saturated air and Winkler titration reference methods—both aligned with EPA Method 360.1 and APHA Standard Methods 4500-O. The instrument’s measurement traceability is maintained through NIST-traceable standards and documented calibration procedures. While not certified for GMP or GLP environments out-of-the-box, its data integrity features—including timestamped storage and non-editable record structure—facilitate alignment with FDA 21 CFR Part 11 expectations when deployed within validated workflows. All electrical components comply with IEC 61010-1 safety standards for laboratory equipment.
Software & Data Management
The A113 stores up to 50 measurement records internally, supporting both manual and timed auto-capture modes. Each entry includes DO value, temperature, date/time stamp, and calibration verification flags. Data export is not supported via USB or Bluetooth; however, records may be manually transcribed or integrated into LIMS via documented SOPs. The device does not include audit trail functionality, electronic signatures, or remote configuration—making it appropriate for non-regulated or semi-regulated applications where simplicity and reliability are prioritized over digital connectivity.
Applications
- Environmental laboratories conducting routine surface water, groundwater, and wastewater DO profiling per NPDES permit requirements
- Academic teaching labs requiring durable, intuitive instrumentation for undergraduate chemistry and environmental science curricula
- Industrial QA/QC labs monitoring aeration basins, bioreactors, and cooling tower systems
- Drinking water treatment facilities performing daily compliance checks under Clean Water Act guidelines
- Research institutions validating sensor performance against reference methods prior to field deployment
FAQ
What calibration methods does the Orion Star A113 support?
The instrument supports two primary calibration protocols: saturated air calibration (at ambient temperature and pressure) and Winkler titration-based zero and span verification.
Is the A113 compliant with ISO/IEC 17025 requirements?
While the hardware meets relevant electrical safety and metrological design principles, formal ISO/IEC 17025 compliance depends on laboratory-specific validation, uncertainty budgeting, and documented traceability—none of which are embedded in the device firmware.
Can the A113 store calibration history separately from sample data?
No—the device does not maintain independent calibration logs; calibration status is indicated iconographically during operation but not archived as discrete records.
Does the A113 support dissolved oxygen measurement in seawater?
Yes, provided salinity is manually entered (0–45 ppt) and atmospheric pressure is accurately set; however, extended exposure to high-salinity samples requires regular membrane replacement and electrolyte replenishment per manufacturer guidelines.
What is the recommended maintenance interval for the polarographic sensor?
Thermo Fisher recommends inspecting the membrane and electrolyte every 30 days under routine use, replacing the membrane every 6–12 months depending on sample matrix aggressiveness and frequency of use.
