Thermo Scientific Orion Star A Benchtop/Portable Basic Conductivity Meter
| Origin | Singapore |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | A112, A122 |
| Pricing | Upon Request |
Overview
The Thermo Scientific Orion Star A Benchtop/Portable Basic Conductivity Meter is a rigorously engineered electrochemical instrument designed for reliable, traceable, and repeatable conductivity and TDS measurements in diverse laboratory, field, and quality control environments. Built upon standardized two-electrode AC conductivity measurement principles—compliant with ASTM D1125 and ISO 7888—the instrument delivers stable readings across aqueous samples by applying a low-frequency alternating current to minimize polarization effects and electrode fouling. Its dual-form factor (benchtop A112 and rugged portable A122) supports seamless transition between controlled lab settings and demanding on-site applications—from municipal water testing and wastewater monitoring to pharmaceutical process water verification and academic teaching labs. The device operates under fixed-frequency excitation (typically 1 kHz), enabling consistent cell constant compensation and temperature normalization per user-defined reference (20 °C or 25 °C), ensuring comparability across global reporting frameworks.
Key Features
- Simultaneous high-contrast LCD display showing conductivity or TDS value, real-time temperature, battery status, calibration state, and operational mode—optimized for readability under ambient lighting and glove use.
- AUTO-READ™ functionality automatically detects signal stability and locks the reading with visual confirmation, eliminating subjective judgment in endpoint determination and improving inter-operator reproducibility.
- Configurable cell constant range (0.001–10.0 cm⁻¹) supports broad electrode selection—from micro-volume immersion probes to industrial flow-through sensors—enabling accurate measurement across dilute ultrapure water (0.1 µS/cm) and highly conductive brines (up to 200 mS/cm).
- Dual power architecture: Four standard AA alkaline batteries (A122: up to 2,000 hours at typical usage; A112: battery backup during power interruption) or universal 100–240 V AC adapter—ensuring uninterrupted operation in GMP-aligned cleanrooms or remote sampling locations.
- Ingress protection rated IP54 (A112 benchtop unit) and IP67 (A122 portable unit), validated per IEC 60529, guarantees resistance to dust ingress and temporary submersion—critical for field deployment in humid, outdoor, or washdown-intensive facilities.
Sample Compatibility & Compliance
The Star A series is validated for use with standard platinum or stainless-steel conductivity cells conforming to DIN EN 27888 and USP . It supports routine analysis of potable water, boiler feedwater, cooling tower fluids, buffer solutions, and non-aggressive aqueous electrolytes. While not intended for high-viscosity, suspended-solids-laden, or strongly oxidizing media without pre-filtration, its linear temperature compensation (0.0–10.0 %/°C) and fixed-point temperature calibration (single-point offset adjustment) align with GLP documentation requirements. Data integrity is maintained through timestamped storage and non-volatile memory retention—even during battery replacement—supporting audit readiness per FDA 21 CFR Part 11 when paired with compliant lab information management systems (LIMS).
Software & Data Management
Internal memory stores up to 50 measurement records, each containing conductivity/TDS value, temperature, date/time stamp, and electrode ID (if encoded). Storage modes include manual entry and time-triggered auto-log (user-definable interval). Data export is performed via manual transcription or optional RS232/USB interface (with compatible cable and Thermo Scientific Orion ComSoft software). All stored entries permit selective deletion (last entry only) or full memory reset—ensuring data governance without proprietary cloud dependency. No firmware-based electronic signatures or audit trails are embedded; however, the device’s deterministic behavior and stable calibration retention meet baseline ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate) for regulated environments.
Applications
- Verification of purified water (PW) and water-for-injection (WFI) conductivity per USP Stage 1 and Stage 2 limits.
- Routine QC testing of rinse water in semiconductor wafer cleaning processes.
- Field-based assessment of surface water salinity and effluent discharge compliance (e.g., EPA Method 120.1).
- Educational demonstration of ionic strength–conductivity relationships in general chemistry laboratories.
- Monitoring of nutrient solution conductivity in hydroponic and aquaculture systems.
FAQ
What calibration protocol does the Star A require?
A single-point conductivity calibration using a certified standard (e.g., 1413 µS/cm KCl) is sufficient for most applications; the instrument does not support multi-point conductivity calibration.
Can the device store calibration history?
No—calibration events are not logged or timestamped; users must manually record date, standard used, and measured value per GLP practice.
Is temperature compensation adjustable per sample type?
Yes—users select either 20 °C or 25 °C as reference temperature and define the linear compensation coefficient (0.0–10.0 %/°C) based on sample matrix characteristics.
Does the meter support GLP-compliant data export?
Raw data export requires external software (Orion ComSoft); no built-in PDF report generation or digital signature capability is provided.
What is the minimum detectable conductivity?
The instrument resolves down to 0.01 µS/cm (at low ranges) with a stated accuracy of ±0.5 % of reading—suitable for ultrapure water screening but not for sub-ppb ionic contamination quantification.
