Techcomp SNB-E Portable Digital Rotational Viscometer
| Brand | Techcomp |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic (China-made) |
| Model | SNB-E Portable Digital Rotational Viscometer |
| Pricing | Available Upon Request |
| Display | Large Backlit LCD (Dual-Language: English/Chinese) |
| Temperature Range | –50 °C to 99 °C (with optional semiconductor temperature probe) |
| Viscosity Range | 0.1–6×10⁶ mPa·s (with standard and optional “0” spindle) |
| Interface | RS232 serial port |
| Power Supply | External AC adapter |
| Compliance | GLP/GMP-ready with real-time clock and audit-trail-capable data logging |
Overview
The Techcomp SNB-E Portable Digital Rotational Viscometer is an entry-level yet rigorously engineered instrument designed for precise, field-deployable viscosity measurement of Newtonian and mildly non-Newtonian liquids. It operates on the principle of rotational viscometry—specifically, the coaxial cylinder (Couette flow) method—where torque required to rotate a spindle at a defined angular velocity within a sample is measured and converted into dynamic viscosity (mPa·s) using calibrated spindle geometry and rotational speed. Unlike capillary or falling-ball viscometers, the SNB-E delivers absolute viscosity values traceable to SI units without reliance on reference fluids. Its compact, battery-free portable architecture—enabled by an external low-noise AC adapter—makes it suitable for QC labs, pilot-scale production lines, R&D mobile units, and on-site process troubleshooting where benchtop rheometers are impractical.
Key Features
- 16-bit microprocessor-controlled measurement system ensuring high repeatability (±1% of full scale) and minimal thermal drift
- Large backlit LCD display with dual-language UI (English/Chinese), supporting intuitive navigation and real-time parameter visualization
- Integrated real-time clock (RTC) for timestamped data acquisition—critical for GLP/GMP-compliant recordkeeping
- RS232 serial interface compliant with standard ASCII protocol, enabling direct connection to PCs or thermal printers for raw data export and report generation
- Optional Pt100-compatible semiconductor temperature probe (sold separately) for simultaneous temperature monitoring across –50 °C to 99 °C, supporting ASTM D445 and ISO 3104 temperature-correction workflows
- Modular spindle system including standard L1–L4 spindles and optional ultra-low-viscosity “0” spindle, extending measurable range from 0.1 mPa·s (e.g., solvents, ethanol) to 6×10⁶ mPa·s (e.g., polymer melts, heavy greases)
- Robust mechanical design with shock-absorbing housing and EMI-shielded electronics, certified for operation in industrial environments per IEC 61326-1
Sample Compatibility & Compliance
The SNB-E accommodates samples from 20 mL (minimum volume with L1 spindle) to full beaker immersion (L4 spindle), compatible with aqueous solutions, organic solvents, oils, paints, adhesives, food emulsions, and pharmaceutical suspensions. Its spindle geometry conforms to DIN 53019-1 and ISO 2555 dimensional standards. While not a full 21 CFR Part 11–validated system, its RTC-stamped data output, non-volatile memory storage, and RS232 log export support retrospective auditability under GLP (OECD Series 1, Annex V) and GMP (ICH Q7, Annex 11) frameworks when deployed with documented SOPs and user access controls.
Software & Data Management
No proprietary software is bundled; however, the RS232 interface supports integration with third-party data acquisition platforms (e.g., LabVIEW, MATLAB, or custom Python scripts via pySerial). Each measurement packet includes viscosity (mPa·s), temperature (°C), spindle ID, speed (rpm), shear rate (s⁻¹, calculated), timestamp (YYYY-MM-DD HH:MM:SS), and instrument ID. Data can be logged directly to CSV or TXT files for statistical process control (SPC), trend analysis, or inclusion in LIMS databases. Optional firmware upgrades—distributed via Techcomp’s secure developer portal—maintain backward compatibility with legacy calibration coefficients.
Applications
- Quality control of lubricants, transformer oils, and hydraulic fluids per ASTM D2983 and ISO 3104
- In-process monitoring of paint and coating formulations during dispersion and thinning stages
- Stability assessment of cosmetic emulsions (creams, lotions) and food colloids (sauces, dairy products)
- Educational laboratories requiring robust, low-maintenance instruments for undergraduate rheology instruction
- Field validation of viscosity specifications in contract manufacturing organizations (CMOs) serving pharma and biotech clients
- Pre-screening of polymer solutions prior to advanced rheological characterization on controlled-stress rheometers
FAQ
Does the SNB-E meet ISO/IEC 17025 calibration requirements?
Yes—when calibrated using NIST-traceable standard oils (e.g., Cannon–Fenske reference fluids) and documented per ISO/IEC 17025 Clause 6.4, the SNB-E satisfies metrological traceability for routine QC applications.
Can the instrument operate without the external power adapter?
No—the SNB-E lacks internal batteries and requires continuous AC input via the supplied adapter; this ensures stable motor torque and eliminates voltage sag-induced measurement variance.
Is the “0” spindle included by default?
No—it is an optional accessory (Part No. SNB-0SP); standard configuration ships with L1–L4 spindles only.
What is the minimum sample volume required for accurate measurement?
20 mL with L1 spindle at 60 rpm; lower volumes (<15 mL) may introduce wall-effect errors and are not recommended for compliance-critical testing.
How often should calibration verification be performed?
Daily verification with a single-point reference oil is advised for regulated environments; full multi-point calibration is recommended every 3 months or after mechanical impact or environmental exposure beyond specification limits.
