MilliporeSigma Direct-Q 3 Integrated Ultrapure and Pure Water System
| Brand | MilliporeSigma |
|---|---|
| Origin | France |
| Model | Direct-Q 3 |
| Purified Water Grade | Type III (RO) |
| Ultrapure Water Grade | Type I |
| Resistivity | 18.2 MΩ·cm at 25°C |
| Heavy Metals & Soluble Silica | <0.1 ppb |
| Total Organic Carbon (TOC) | <5 ppb (with dual-wavelength 185/254 nm UV lamp) |
| Microbial Count | <1 CFU/mL |
| Endotoxins | <0.01 EU/mL |
| RNase | <0.003 ng/mL |
| Particles (>0.22 µm) | <1 particles/mL |
| Flow Rate (Ultrapure) | >0.5 L/min |
| Flow Rate (Pure, RO) | 2.4 L/h at 15°C |
| Internal Reservoir Capacity | 6.5 L |
| Dimensions (H×W×D) | 54 × 29 × 42 cm |
| Weight | 17.6–18.2 kg |
Overview
The MilliporeSigma Direct-Q 3 Integrated Ultrapure and Pure Water System is an engineered solution for laboratories requiring consistent, on-demand production of both Type I ultrapure water (ASTM D1193-20, ISO 3696 Class 1) and Type III purified water (ASTM D1193-20, ISO 3696 Class 3) directly from municipal tap water. Utilizing a multi-stage purification architecture—including reverse osmosis (RO), ion exchange, activated carbon adsorption, dual-wavelength (185/254 nm) ultraviolet photo-oxidation, and terminal ultrafiltration—the system delivers water meeting stringent analytical and life science application requirements. Its compact footprint (54 × 29 × 42 cm) and modular design enable flexible benchtop installation without dedicated plumbing or pre-treatment infrastructure. The system operates under continuous monitoring of key parameters—resistivity, temperature, and UV intensity—with real-time display on a full-color graphical interface. Designed for daily ultrapure water demand between 1 and 10 liters, the Direct-Q 3 serves as a self-contained, low-maintenance alternative to centralized water distribution systems.
Key Features
- Integrated dual-grade water production: Simultaneous generation of Type III RO water (2.4 L/h at 15°C) and Type I ultrapure water (>0.5 L/min) from standard tap feedwater.
- Dual-wavelength UV oxidation: 185 nm + 254 nm lamps ensure robust organic molecule degradation, enabling TOC reduction to <5 ppb—critical for HPLC, GC, IC, and TOC analysis.
- Patented integrated purification cartridge: Combines RO membrane, mixed-bed ion exchange resin, and activated carbon in a single replaceable unit—minimizing downtime and operator error during maintenance.
- Terminal ultrafiltration options: BioPak™ ultrafilter (0.22 µm, endotoxin- and RNase-free) or Millipak® Express 20 filter for particle control (0.22 µm) and microbial retention (<1 CFU/mL).
- Intelligent dispensing: Programmable volume delivery with automatic shut-off; supports quantitative dispensing into flasks, volumetric cylinders, and other labware via ergonomic spigot or optional wall-mounted dispenser.
- Real-time quality assurance: Built-in resistivity sensor calibrated per ASTM D1125, continuously monitored and logged; automatic alarm triggers upon deviation from set thresholds (e.g., resistivity drop below 18.0 MΩ·cm).
- Certified safety & environmental compliance: UL/cUL listed under E216983 (Laboratory Use Electrical Equipment); compliant with UL 61010-1, EN 61000-6-3 (EMC), EN 61000-6-1 (immunity), and CE directives 2014/30/EU and 2014/35/EU.
Sample Compatibility & Compliance
The Direct-Q 3 produces water validated for use across regulated and research-intensive environments. Type I output meets or exceeds specifications defined in USP , EP 2.2.44, and JP 17 for water for injection (WFI)-adjacent applications, including cell culture media preparation, molecular biology workflows (PCR, sequencing, transfection), and sensitive analytical techniques. Endotoxin levels (<0.01 EU/mL) and RNase/DNase activity (<0.003 ng/mL) are verified using kinetic chromogenic LAL assays and enzymatic fluorometric detection—supporting GLP/GMP-aligned documentation practices. All components are manufactured in ISO 9001:2015 and ISO 14001:2015 certified facilities. System firmware supports audit trail functionality compatible with FDA 21 CFR Part 11 requirements when paired with MilliporeSigma’s Elix® Data Management Software (optional).
Software & Data Management
While the Direct-Q 3 operates as a standalone instrument, its embedded microcontroller logs operational data—including date/time stamps, resistivity values, UV lamp status, and cartridge usage hours—for local review via the color display. For traceable recordkeeping, integration with MilliporeSigma’s optional Elix® Data Management Software enables secure export of CSV-formatted logs, user access control, electronic signature support, and automated report generation aligned with laboratory quality management systems. All data are stored in non-volatile memory with battery-backed timekeeping, ensuring continuity during power interruption. No cloud connectivity or remote telemetry is enabled by default—preserving data sovereignty and network security.
Applications
- HPLC, UHPLC, and LC-MS mobile phase and blank preparation where low TOC and ionic contamination are critical.
- GC and IC solvent formulation requiring sub-ppb metal and silica content.
- Cell culture, stem cell expansion, and primary neuron isolation requiring endotoxin- and nuclease-free water.
- Preparation of standards and calibration solutions for ICP-MS, AAS, and ion chromatography.
- Buffer and reagent dilution for ELISA, Western blotting, and flow cytometry.
- Routine glassware rinsing and equipment cleaning where residual ions or organics must be minimized.
- Feedwater for downstream instruments such as mass spectrometers, atomic absorption spectrometers, and automated analyzers.
FAQ
What is the expected service life of the integrated purification cartridge?
Cartridge replacement is recommended every 6–12 months depending on feedwater quality and daily usage volume; system software tracks usage hours and displays a maintenance alert prior to expiration.
Can the Direct-Q 3 be connected to a central water distribution loop?
No—it is designed exclusively as a point-of-use system with internal 6.5 L reservoir; it does not support pressurized loop integration or remote dispensing networks.
Is the system compatible with hard or chlorinated municipal water supplies?
Yes; the integrated activated carbon stage and RO membrane are rated for typical municipal feed conditions (up to 200 ppm chlorine residual and 300 ppm total dissolved solids); pretreatment is unnecessary but recommended if feedwater exceeds these limits.
How is microbial control maintained throughout the system?
Microbial growth is suppressed via continuous UV irradiation (254 nm), periodic recirculation through the UV chamber, and terminal filtration using either Millipak® Express 20 (0.22 µm) or BioPak™ ultrafilters.
Does the system provide electronic data export for regulatory submissions?
Yes—when used with optional Elix® Data Management Software, full audit trails, user authentication, and electronic signatures comply with FDA 21 CFR Part 11 and EU Annex 11 requirements.
