Brookfield SSA Small Sample Adapter for Rotational Viscometers and Rheometers
| Brand | Brookfield |
|---|---|
| Origin | USA |
| Model | SSA |
| Sample Volume | 2–16 mL |
| Temperature Control Range | –15 °C to 100 °C (with optional RTD probe) |
| Compatible Instruments | All Brookfield DV-series viscometers and RST/ARES rheometers |
| Minimum Measurable Viscosity | ≥1 cP (mPa·s) |
| Shear Rate Range | 0.25–2.2 s⁻¹ (dependent on spindle/chamber combination) |
| Spindle Types | SC4-series (e.g., SC4-14, SC4-15, SC4-21, SC4-27, SC4-28, SC4-29, SC4-31, SC4-34) |
| Sample Chamber Types | SC4-6R(P), SC4-7R(P), SC4-8R(P), SC4-13R(P), SC4-13RPY, SC4-13RD-100 |
| Optional Accessories | Water-jacketed mounting bracket, SC4 spindles, disposable aluminum chambers, RTD-integrated chambers, thermal insulation lid, extension hook assembly |
Overview
The Brookfield SSA (Small Sample Adapter) is an engineered precision accessory designed for rotational viscometry and controlled-shear rheological characterization of limited-quantity fluid samples. It operates on the principle of coaxial cylinder (Couette) flow geometry, where torque exerted by a rotating spindle immersed in a cylindrical sample chamber is measured under defined rotational speed (RPM), enabling calculation of dynamic viscosity (η) and shear rate (γ̇) via Newtonian or non-Newtonian constitutive models. The SSA integrates seamlessly with all Brookfield digital viscometers (DV1M, DV2T, DV3T series) and advanced rheometers (RST-SST, ARES-G2), delivering reproducible measurements for volumes as low as 2.1 mL — critical when working with high-value, scarce, or hazardous materials such as pharmaceutical formulations, specialty polymers, biological fluids, or catalytic slurries. Its rigid stainless-steel construction, thermally isolated chamber design, and compatibility with external recirculating baths ensure measurement stability across extended test durations and wide temperature ranges.
Key Features
- Ultra-low sample consumption: Supports volumes from 2.1 mL (SC4-6R(P)) to 16.1 mL (SC4-13R(P)), minimizing material waste and cost exposure.
- Integrated temperature control architecture: Equipped with a precision-machined water-jacketed sample chamber that interfaces directly with Brookfield TC-series or third-party recirculating chillers/heaters for ±0.1 °C thermal stability (–15 °C to 100 °C).
- Modular, tool-free chamber exchange: Quick-release mounting bracket enables rapid swapping of sample chambers without recalibration or disruption to bath circulation or instrument alignment.
- RTD-enabled real-time temperature monitoring: Optional SC4-13RPY chamber includes a calibrated platinum resistance thermometer (PT100) wired directly to DV-I+, DV-II+PRO, and DV-III ULTRA displays — eliminating external thermocouple drift and enabling traceable thermal validation per ISO 17025 requirements.
- Disposable aluminum chamber option (SC4-13RD-100): Eliminates cross-contamination risk and cleaning downtime for highly viscous, reactive, or bioactive samples; validated for single-use compliance in GLP environments.
- Full spindle interchangeability: Accepts all SC4-series spindles (including Hastelloy C variants for corrosive media), allowing shear rate tuning from 0.25 s⁻¹ (SC4-29) to 2.2 s⁻¹ (SC4-18) at fixed RPM settings.
Sample Compatibility & Compliance
The SSA is validated for Newtonian and time-independent non-Newtonian fluids with viscosities ≥1 cP (mPa·s). It is unsuitable for ultra-low-viscosity liquids (e.g., solvents, gases) due to insufficient torque generation at standard rotational speeds. Chamber geometries comply with ASTM D2196 (Standard Test Methods for Rheological Properties of Non-Newtonian Materials) and ISO 3219 (Rotational viscometers — Calibration and use). When paired with Brookfield’s FDA 21 CFR Part 11-compliant software (Rheo3000 v5.0+), the system supports audit-trail logging, electronic signatures, and user-access controls required for regulated QC/QA workflows in pharmaceutical (USP , ) and food manufacturing (HACCP) applications. Disposable chambers meet ISO 15197:2013 biocompatibility guidelines for diagnostic reagent handling.
Software & Data Management
All compatible Brookfield instruments automatically recognize SSA spindle–chamber combinations and compute absolute viscosity (cP or mPa·s), shear stress (Pa), and shear rate (s⁻¹) in real time using factory-calibrated torque constants. Data export is supported via USB, RS-232, or Ethernet to CSV, Excel, or LIMS-compatible formats. With optional Rheo3000 software, users configure multi-step ramp tests (e.g., shear-rate sweeps, thixotropy recovery), apply Herschel-Bulkley or Cross model fitting, and generate GMP-compliant PDF reports containing instrument ID, operator signature, environmental logs, and calibration certificate references. Audit trails record timestamped parameter changes, data exports, and user logins — fully compliant with FDA 21 CFR Part 11 Annex 11 and EU GMP Annex 11.
Applications
- Pharmaceutical development: Viscosity profiling of injectable suspensions, ophthalmic solutions, and mRNA-LNP formulations where batch sizes are sub-milliliter.
- Academic rheology research: Characterization of microfluidic droplet phases, ionic liquid electrolytes, and nanofluid dispersions under controlled thermal gradients.
- Quality control of specialty chemicals: Batch release testing of silicone oils, epoxy prepolymers, and conductive pastes where raw material cost exceeds $500/g.
- Food science: Texture analysis of artisanal dairy concentrates, fermented plant-based creams, and low-volume flavor emulsions without dilution artifacts.
- Materials science: Screening of battery slurry rheology prior to coating trials, ensuring shear-thinning behavior aligns with slot-die process windows.
FAQ
Can the SSA be used with non-Brookfield viscometers?
No — mechanical interface dimensions, torque sensor communication protocols, and spindle recognition firmware are proprietary to Brookfield instrumentation.
Is calibration required when switching between SC4 spindles or chambers?
No — all SC4 components are factory-calibrated as matched sets; the instrument auto-detects geometry and applies corresponding K-factors.
What is the minimum viscosity measurable with the SSA?
1 cP (mPa·s) under standard operating conditions; values below this threshold yield signal-to-noise ratios insufficient for statistical confidence per ISO 2555.
Does the SSA support yield stress determination?
Not natively — it lacks controlled-stress capability; for yield point analysis, pair with a Brookfield RST-SST or ARES-G2 rheometer using the same SC4 geometry.
Are Hastelloy C spindles available for aggressive solvents?
Yes — select SC4-27, SC4-31, and SC4-34 spindles are offered in Hastelloy C-276 upon request; contact technical support for corrosion compatibility matrices.
