HNPM mzr Series Micro Annular Gear Pumps
| Brand | HNPM |
|---|---|
| Origin | Germany |
| Drive Type | Electric DC Servo Motor |
| Speed Range | 0–6000 rpm |
| Flow Rate | 1 µL/h – 1.1 L/h |
| Viscosity Range | 0.3 – 1,000,000 mPa·s |
| Pressure Differential | up to 150 bar |
| Temperature Range | −55 °C to +150 °C |
| Precision (CV) | 0.1–3 % |
| Wetted Materials | SS 316L, WC-Ni, ZrO₂, SiC, Alloy C22, FFKM, PTFE |
Overview
The HNPM mzr Series Micro Annular Gear Pumps are precision-engineered positive displacement pumps designed for ultra-accurate, pulseless, and continuous fluid metering across demanding laboratory, analytical, and industrial applications. Based on the proven annular gear principle—where a single gear rotates eccentrically within a concentric ring cavity—the mzr pumps deliver exceptional volumetric accuracy and repeatability without internal valves or pulsation artifacts. This hydrodynamic design ensures laminar flow behavior, minimal shear stress, and intrinsic resistance to cavitation, making them ideal for sensitive biological samples, reactive reagents, high-viscosity polymers, and corrosive process fluids. Manufactured in Germany and compliant with ISO 9001 quality management systems, each mzr pump is calibrated and validated prior to shipment, supporting traceable metrology in GLP- and GMP-regulated environments.
Key Features
- True micro-dosing capability: minimum dispense volume down to 0.25 µL per stroke, enabling nanoliter-scale quantitative delivery in automated assay platforms and microfluidic interfaces.
- Multi-material wetted path options: standard configurations feature SS 316L (1.4404/1.4435), while chemically inert variants utilize ZrO₂ ceramic rotors, SiC shafts/bearings, Alloy C22 (2.4602) housings, and FFKM (Kalrez® Spectrum™ 6375) seals—validated for compatibility with strong acids (e.g., HNO₃, H₂SO₄), caustics (e.g., NaOH), halogenated solvents, and peroxide-based formulations.
- Hermetic magnetic coupling (8-pole NdFeB): eliminates dynamic seals and prevents leakage, ensuring Class I containment for hazardous or regulated substances per ASTM E2500 and IEC 61000-6-3 EMC guidelines.
- Integrated 16-bit microcontroller with analog (0–10 V / 4–20 mA) and digital (RS-232, CANopen DSP 301/402, optional CAN bus) interfaces—enabling seamless integration into PLC-controlled synthesis reactors, HPLC auxiliary solvent delivery modules, or ISO 17025-accredited calibration workflows.
- Modular architecture: interchangeable heating jackets (−20 °C to +150 °C), thermal insulation sleeves, fluid conditioning manifolds (2 mm OD push-to-connect or 1/8″ NPT), and gear ratio kits allow field adaptation to evolving process requirements without redesign.
Sample Compatibility & Compliance
The mzr series accommodates a broad physicochemical spectrum: aqueous buffers, methanol, acetone, glycerol, silicone oils (up to 10⁶ mPa·s), adhesives, UV-curable resins, fuel cell electrolytes (e.g., KOH, phosphoric acid), and pharmaceutical excipients. All models meet CE marking requirements under the EU Machinery Directive 2006/42/EC and Electromagnetic Compatibility Directive 2014/30/EU. High-inertness variants comply with USP for plastic components and FDA 21 CFR Part 11–ready audit trails when paired with HNPM’s optional PumpControl software. Pressure ratings conform to PED 2014/68/EU Annex I essential safety requirements; maximum system pressure (inlet + Δp) reaches 80 bar for inert variants and 150 bar for high-pressure mechanical configurations.
Software & Data Management
HNPM PumpControl v4.x provides deterministic real-time flow regulation via PID algorithms with sub-millisecond response latency. The software supports method-based operation (predefined flow profiles, ramped acceleration/deceleration), batch logging with timestamped metadata (operator ID, ambient T/P, motor current), and export to CSV/Excel for statistical process control (SPC) per ISO 22514-2. Audit trail functionality meets ALCOA+ principles: attributable, legible, contemporaneous, original, accurate—with electronic signatures compliant with 21 CFR Part 11 Annex 11. Remote monitoring via Ethernet/Wi-Fi gateway modules enables centralized fleet management across multi-site QC laboratories.
Applications
- Pharmaceutical: precise co-solvent addition in continuous API crystallization, low-volume dissolution testing (USP Apparatus 2/4), and sterile fill-finish line priming.
- Chemical Synthesis: stoichiometric reagent dosing in flow reactors (e.g., Grignard, lithiation), catalyst injection in hydrogenation loops, and inline viscosity adjustment during polymerization.
- Energy Research: controlled electrolyte replenishment in PEM fuel cells, anolyte/catholyte circulation in redox flow batteries, and lubricant dosing in tribology test rigs.
- Environmental Analytics: sub-ppb-level standard addition in ICP-MS sample introduction, membrane interface delivery for online TOC analyzers, and discrete aliquoting in automated EPA Method 525.3 extraction workflows.
- Aerospace Materials Testing: metered application of anti-icing fluids on composite substrates, and high-temperature hydraulic fluid circulation in thermal vacuum chamber simulations.
FAQ
What is the minimum measurable flow rate achievable with the mzr-2505 model?
The mzr-2505 achieves a verified continuous flow rate as low as 10 µL/h (0.0017 mL/min) under optimized temperature and backpressure conditions—validated using gravimetric measurement per ISO 5725-2:1994.
Can the mzr pump handle abrasive slurries containing solid particles?
No. The mzr series is designed exclusively for homogeneous liquids. Suspended solids >1 µm will accelerate wear of ceramic gears and SiC bearings; filtration to ≤0.2 µm is mandatory prior to inlet.
Is firmware update capability supported in the field?
Yes. Firmware upgrades are performed via RS-232 or CANopen using HNPM’s certified DFU (Device Firmware Update) protocol, preserving all user calibration coefficients and regulatory audit logs.
How does the pump maintain accuracy across varying fluid viscosities?
The integrated torque-sensing servo controller dynamically adjusts motor current to compensate for load changes, maintaining constant angular velocity—and thus constant volumetric displacement—across the full specified viscosity range (0.3–25,000 mPa·s for mzr-2505).
Are explosion-proof versions available for Zone 1 hazardous areas?
Yes. ATEX-certified variants (II 2G Ex db IIB T4 Gb) with intrinsically safe power supply and non-sparking motor windings are offered under model suffix “-ATEX”; documentation includes IECEx Test Report EXTR-23.00127.
