HNPM mzr6355 / mzr7255 / mzr11558 Chemically Inert Micro Annular Gear Pump
| Brand | HNPM |
|---|---|
| Origin | Germany |
| Drive Type | Electric |
| Speed Range | 0–300 rpm |
| Flow Rate | 1 µL/h – 1.1 L/h |
| Materials | SiC bearings, Hastelloy C-22 (2.4602) housing, ZrO₂/Al₂O₃ or WC-Co rotors |
| Max Pressure | 150 bar |
| Viscosity Range | 0.3 – 1,000,000 mPa·s |
| Compliance | FDA-compliant wetted materials available, ATEX-certified variants (II 2G Ex db IIB T4 Gb / II 2D Ex tb IIIB T135°C Db) |
Overview
The HNPM mzr6355, mzr7255, and mzr11558 micro annular gear pumps are precision-engineered, chemically inert metering pumps designed for continuous, pulse-free delivery of aggressive, corrosive, or sensitive fluids in demanding laboratory and pilot-scale process environments. Based on the proven principle of micro annular gear displacement—where a precisely machined rotor rotates within a concentric stator cavity to generate volumetric flow—the pump delivers exceptional accuracy, repeatability, and long-term stability without relying on valves or flexible diaphragms. Its fully sealed, magnetically coupled architecture eliminates dynamic seals and shaft penetration, ensuring zero leakage even under vacuum or high-pressure conditions (up to 150 bar). Developed by HNPM Mikrosysteme GmbH (founded 1998, Freiburg im Breisgau, Germany), this series represents the culmination of over two decades of specialization in microfluidic dosing for analytical instrumentation, flow chemistry, microreactor systems, and advanced material synthesis.
Key Features
- Chemically inert wetted path constructed from corrosion-resistant ceramics (ZrO₂, Al₂O₃, WC-Co) and high-performance alloys (Hastelloy C-22, UNS N06022 / 2.4602), enabling compatibility with strong acids (e.g., HF, HNO₃, H₂SO₄), caustics (e.g., concentrated NaOH), halogenated solvents, and oxidizing media.
- Magnetic torque coupling using sintered NdFeB magnets ensures hermetic sealing—critical for handling air-sensitive, pyrophoric, or crystallizing liquids without risk of ingress or degradation.
- Ultra-low pulsation (< ±0.5% peak-to-peak) and minimal shear stress preserve integrity of shear-sensitive biomolecules, nanoparticles, or polymer solutions.
- Modular pump head design allows rapid, tool-free replacement of wear components—rotor, stator, and bearings—without recalibration or realignment, minimizing downtime and supporting GLP-compliant maintenance logs.
- Integrated motion controller (optional) enables precise speed regulation (0–300 rpm), programmable ramp profiles, and analog/digital (RS-485, CANopen, EtherCAT) interface integration for automated process control.
- Compact footprint (e.g., mzr6355: 125 × 60 × 65 mm) with low mass (<1.2 kg) facilitates integration into confined spaces—including gloveboxes, vacuum chambers, and modular flow reactors.
Sample Compatibility & Compliance
These pumps are validated for use with fluids spanning a viscosity range of 0.3 to 1,000,000 mPa·s and operating temperatures from −20 °C to +120 °C (with optional heater module). Wetted materials comply with USP Class VI and FDA 21 CFR §177.2600 for food-contact and pharmaceutical applications. ATEX-certified variants (Category 2G/2D, zone 1/21) meet Directive 2014/34/EU for explosive atmospheres. All models support IQ/OQ documentation packages and are compatible with ISO 9001 and ISO 13485 quality management frameworks. Traceability is ensured via laser-engraved serial numbers and material certification (EN 10204 3.1) for all critical components.
Software & Data Management
HNPM’s proprietary PumpControl software provides real-time monitoring of rotational speed, motor current, and operational status. It supports batch logging (CSV export), alarm configuration (e.g., stall detection, overpressure), and time-stamped event recording aligned with GLP/GMP audit requirements. For regulated environments, optional firmware modules enable 21 CFR Part 11 compliance—including electronic signatures, role-based access control, and immutable audit trails. Integration with LabVIEW, Python (PySerial), and SCADA platforms is supported via open communication protocols.
Applications
- Flow chemistry & microreactor feeding: Precise stoichiometric dosing of reagents in continuous synthesis (e.g., Grignard, lithiation, nitration).
- High-performance liquid chromatography (HPLC) and supercritical fluid chromatography (SFC) auxiliary solvent delivery.
- Corrosive electrolyte metering in fuel cell R&D and battery electrolyte formulation.
- Vacuum-compatible precursor delivery in atomic layer deposition (ALD) and chemical vapor deposition (CVD) systems.
- Encapsulated active ingredient dispensing in pharmaceutical microencapsulation and inhaler formulation.
- Dosing of aggressive etchants (e.g., BOE, piranha) in semiconductor wet bench automation.
FAQ
What materials are in contact with the fluid? Are they FDA-compliant?
Wetted components include silicon carbide (SSiC) bearings, Hastelloy C-22 (2.4602) housing, and ceramic rotors (ZrO₂, Al₂O₃, or WC-Co). FDA-compliant versions use USP Class VI-certified elastomers (where applicable) and fully metal/ceramic paths—no polymers in direct contact.
Can the pump handle crystallizing or particulate-laden fluids?
Yes—the magnetic coupling and absence of check valves or narrow capillaries allow reliable operation with suspensions up to 50 µm particle size and crystallizing media such as molten salts or saturated brines.
Is vacuum operation supported?
All models are rated for inlet pressures down to 0.1 mbar absolute; optional vacuum-rated motor housings and degassed lubricants are available for sustained sub-10 mbar operation.
How is calibration traceability maintained?
Each pump is factory-calibrated using gravimetric NIST-traceable standards (ASTM E2709). Calibration certificates include uncertainty budgets and are valid for 12 months under defined operating conditions.
What safety certifications apply to hazardous area installations?
ATEX-certified variants carry full EU Type Examination Certificates (e.g., PTB 22 ATEX 0032 X) for gas (II 2G Ex db IIB T4 Gb) and dust (II 2D Ex tb IIIB T135°C Db) environments, compliant with IEC 60079-0/-7/-31.
