HNPM MZR-2905 Micro Annular Gear Pump

Overview

The HNPM MZR-2905 Micro Annular Gear Pump is a precision-engineered positive displacement pump designed for continuous and discrete microfluidic dosing in demanding laboratory and industrial process environments. Based on rotary micro annular gear technology, it operates via two intermeshing, offset annular gears rotating within a precisely machined housing—generating highly repeatable volumetric displacement with minimal pulsation and low shear stress. Unlike peristaltic or diaphragm pumps, the MZR-2905 delivers true volumetric accuracy independent of fluid compressibility or backpressure fluctuations, making it suitable for applications requiring trace-level delivery stability under variable load conditions. Its compact footprint (140 × 45 × 65 mm), integrated 16-bit microcontroller, and robust wetted path—including tungsten carbide gearing, SS 316L (1.4404/1.4435) body, and graphite-reinforced PTFE shaft seals—enable reliable operation across wide viscosity ranges (0.3–50,000 mPa·s) and pressure differentials up to 30 bar (with oil at 16 mPa·s). Designed and manufactured in Germany, the pump complies with CE directives and meets material compatibility requirements for GLP and GMP-aligned workflows where traceability and long-term calibration stability are critical.

Key Features

• True volumetric displacement: 3 µL per revolution, enabling sub-microliter dosing resolution (minimum dose: 0.5 µL) and coefficient of variation (CV) <1% across full flow range (0.003–18 mL/min)
• Low-pulsation, low-shear operation ideal for shear-sensitive fluids (e.g., polymer solutions, biological suspensions, nanoparticle dispersions)
• Wide operational speed range (1–6000 rpm) with high-resolution speed control via analog (0–10 V) or digital (RS-232) interface
• High-pressure capability: up to 5 bar inlet pressure rating; differential pressure up to 30 bar with viscous media (e.g., oils, adhesives, pastes)
• Hermetically sealed, metal-to-metal gear train with tungsten carbide components ensures >10,000 hours of maintenance-free service life under nominal load
• Integrated 24 V DC servo motor (44 W) and embedded controller eliminate need for external motion controllers or PLC modules
• Front-mount 1/4″–28 UNF fluid port; optional side-inlet 1/8″ NPT configuration supports modular system integration

Sample Compatibility & Compliance

The MZR-2905 is validated for use with aqueous solutions, organic solvents (e.g., methanol, acetone), lubricants, hydraulic oils, UV-curable resins, adhesives, inks, coatings, greases, and gels. Its wetted materials—SS 316L (EN 1.4404 / 1.4435), tungsten carbide gears, graphite-impregnated PTFE shaft seals, and FPM (FKM) static seals—meet FDA-compliant material specifications for incidental food contact (21 CFR §177.1550, §177.2600) and are compatible with ISO 8502-9 cleanliness validation protocols. The pump’s design supports compliance with ISO/IEC 17025 calibration traceability frameworks and is routinely deployed in laboratories adhering to USP , ASTM D341, and EN ISO 13843 standards for volumetric delivery verification. Optional EPDM or FFPM seals extend chemical compatibility to strong bases and oxidizing agents.

Software & Data Management

The integrated 16-bit microcontroller provides real-time speed regulation, pulse-width modulation (PWM) motor control, and onboard fault diagnostics (e.g., stall detection, thermal overload, seal leakage monitoring). Communication via RS-232 enables bidirectional command/response protocol (ASCII-based SCPI subset), supporting remote parameter setting, flow rate ramping, batch dosing sequences, and event-triggered logging. Analog 0–10 V input allows seamless integration into legacy DCS or PLC architectures without protocol translation. All operational parameters—including cumulative volume dispensed, total revolutions, runtime hours, and temperature history—are stored in non-volatile memory with timestamped audit trails compliant with FDA 21 CFR Part 11 requirements when paired with validated host software. Firmware updates are performed via serial interface using signed binaries to ensure integrity.

Applications

• Continuous reagent delivery in automated analytical systems (e.g., flow injection analysis, IC, HPLC auxiliary streams)
• Precision metering of adhesives, sealants, and encapsulants in microelectronics assembly and medical device manufacturing
• Controlled solvent addition in vacuum-assisted resin transfer molding (VARTM) and composite layup processes
• Calibration fluid dispensing in metrology labs performing gravimetric flow verification per ISO 4064-2
• Dosing of high-viscosity functional fluids (e.g., thermal pastes, conductive inks) in R&D prototyping lines
• Low-flow sampling in environmental monitoring stations (e.g., groundwater tracer injection, nutrient dosing in mesocosms)

FAQ

What is the minimum measurable flow rate with guaranteed accuracy?
The pump achieves ±1% linearity and CV <1% down to 0.003 mL/min (10 µL/h) under calibrated conditions using water at 20 °C and 1 bar backpressure.
Can the MZR-2905 handle abrasive slurries or particulate-laden fluids?
No—it is not recommended for suspended solids >10 µm or abrasive media, as these may accelerate wear of tungsten carbide surfaces and compromise volumetric fidelity.
Is the pump suitable for sterile or aseptic processing?
While wetted materials meet USP Class VI biocompatibility, the unit is not autoclavable or SIP-capable; for sterile applications, it must be installed downstream of a sterilizing-grade filter and operated within ISO 5 cleanroom-rated enclosures.
How is calibration traceability maintained over time?
HNPM provides NIST-traceable factory calibration certificates (per ISO/IEC 17025) with annual recalibration intervals recommended; users may perform in-house verification using gravimetric or timed-volume methods per ASTM D1147.
Does the controller support multi-pump synchronization?
Yes—the RS-232 interface supports daisy-chained addressing, and the analog input allows master-slave speed coordination with external PID controllers or motion sequencers.