HNPM MZR-2542 Low-Pressure Micro Annular Gear Pump

Overview

The HNPM MZR-2542 is a precision-engineered low-pressure micro annular gear pump designed for accurate, pulse-free fluid handling in demanding analytical and process-critical laboratory environments. Unlike peristaltic or diaphragm-based systems, the MZR-2542 employs a true rotary positive displacement principle based on micro annular gear geometry—where a precisely machined inner rotor rotates eccentrically within an outer ring gear, generating consistent volumetric displacement with each revolution. This architecture eliminates valves, check mechanisms, and compressible elements, ensuring inherently low shear stress, minimal pulsation (<0.5% peak-to-peak), and exceptional long-term metrological stability. Its compact form factor (Ø16 mm × 90 mm, 70 g) enables seamless integration into automated workstations, microfluidic platforms, and benchtop analytical instruments requiring sub-milliliter dosing fidelity under chemically aggressive conditions.

Key Features

• Ultra-high chemical resistance: wetted components configurable from corrosion-resistant materials including Hastelloy® C22 (2.4602), Hastelloy® C276, zirconia (ZrO₂) ceramic, tungsten carbide (WC), PEEK™ polymer, and fluorinated elastomers (FFPM)
• Exceptional dosing accuracy: coefficient of variation (CV) <1% across full flow range; minimum dispense volume of 0.25 µL supported by 1.5 µL geometric displacement per revolution
• Intelligent motor control: integrated 24 V DC brush-type motor with digital magnetic encoder (32 pulses/rev) enabling closed-loop speed regulation, real-time RPM feedback, and programmable acceleration/deceleration profiles
• Low-shear, valveless operation: annular gear mechanism ensures laminar, non-pulsating flow ideal for shear-sensitive biomolecules, colloidal suspensions, and reactive reagents
• Modular fluid path design: standardized 2 mm OD slip-fit connections; optional manifold modules (M2.1 thread) support multi-channel parallel dispensing configurations
• Robust thermal and pressure performance: rated for continuous operation from −20 °C to +60 °C ambient; differential pressure capability up to 1.5 bar with maximum inlet pressure of 1 bar

Sample Compatibility & Compliance

The MZR-2542 is validated for use with aggressive solvents (e.g., concentrated acids, halogenated organics), high-salinity buffers, and oxidizing media where stainless steel or standard polymer pumps fail. Material selections comply with USP Class VI and FDA 21 CFR 177.2470 (for PEEK™), ASTM F2028 (for fluoropolymer seals), and ISO 10993-5 cytotoxicity standards. When configured with Alloy C22 and FFPM seals, the pump meets requirements for GLP-compliant analytical workflows and supports audit-ready documentation under ISO/IEC 17025-accredited laboratories. Optional traceable calibration certificates (DIN EN ISO/IEC 17025) are available upon request.

Software & Data Management

The pump operates via analog voltage (0–10 V) or digital TTL/RS-485 interface, supporting direct integration with LabVIEW™, Python-controlled automation frameworks (e.g., PySerial, pymodbus), and commercial PLCs. Firmware includes built-in diagnostic registers for motor current monitoring, temperature logging (via internal thermistor), and encoder error detection—enabling predictive maintenance and failure mode analysis. When deployed in regulated environments, configuration parameters, operational logs, and dose history can be exported in CSV or XML format for inclusion in electronic lab notebooks (ELN) or LIMS systems compliant with 21 CFR Part 11 requirements.

Applications

• High-precision reagent delivery in HPLC, IC, and capillary electrophoresis sample introduction systems
• Controlled catalyst injection in microreactor arrays for flow chemistry optimization
• Dosing of viscous or particulate-laden formulations (up to 1000 mPa·s with appropriate rotor selection) in pharmaceutical formulation development
• Automated cell culture media exchange and perfusion in bioreactor control loops
• Calibration fluid transport in gravimetric and syringe-pump validation protocols
• On-chip liquid handling for organ-on-a-chip and micro-TAS platforms requiring sub-µL repeatability

FAQ

What is the minimum controllable flow rate, and how is it achieved?
The MZR-2542 achieves a minimum flow of 0.0015 mL/min (1.5 µL/min) using its lowest stable rotational speed of 1 rpm combined with 1.5 µL/rev displacement. Sub-microliter dosing (down to 0.25 µL) is enabled via discrete step-and-hold motor control.
Can the pump handle abrasive slurries or particles?
Yes—when equipped with tungsten carbide (WC) rotors and ceramic bearings, the MZR-2542 maintains metrological integrity with suspended solids up to 50 µm in diameter, provided particle concentration remains below 5 vol%.
Is the pump suitable for sterile or aseptic applications?
While not autoclavable, the MZR-2542 supports SIP (steam-in-place) at ≤121 °C for ≤15 min when fitted with FFPM seals and Alloy C22 housing; full sterilization validation requires user-specific protocol qualification.
How does the annular gear design compare to conventional gear or piston pumps in terms of pulsation?
Annular geometry delivers inherently lower flow ripple (10%), due to continuous, overlapping displacement without dead volume or valve lag.
Does HNPM provide OEM integration support and custom firmware?
Yes—HNPM offers dedicated engineering support for mechanical mounting, electrical interface adaptation, and application-specific firmware extensions, including I²C communication, PID-controlled flow regulation, and multi-pump synchronization logic.