HNPM MZR-7205 Micro Precision Gear Pump

Overview

The HNPM MZR-7205 Micro Precision Gear Pump is a compact, high-accuracy constant-flow positive displacement pump engineered for demanding laboratory and industrial fluid handling applications. Based on rotary micro annular gear technology, it delivers precise, low-pulsation volumetric flow across an exceptionally broad viscosity range—from low-viscosity solvents (e.g., methanol, water, acetone) to highly viscous media including adhesives, greases, gels, inks, and coatings (up to 50,000 mPa·s standard; configurable up to 1,000,000 mPa·s). Its design eliminates the need for valves or pulsation dampeners while maintaining shear-sensitive integrity—critical for biological samples, polymer solutions, and reactive formulations. The pump operates via a precision-machined tungsten carbide gear set driven by a closed-loop 24 V DC servo motor, enabling repeatable dosing with coefficient of variation (CV) < 1% under stable operating conditions. With a displacement volume of 48 µL per revolution and minimum dispense capability of 30 µL, the MZR-7205 supports both continuous flow delivery and discrete micro-dosing tasks in analytical, process development, and automated manufacturing environments.

Key Features

• Rotary micro annular gear mechanism ensuring ultra-low pulsation (< ±0.5% peak-to-peak) and minimal shear stress—ideal for shear-thinning or fragile fluids
• Wide operational viscosity range: 0.3–50,000 mPa·s (standard); extended to 1,000,000 mPa·s with application-specific wetted material and sealing configurations
• High metrological accuracy: CV < 1% across full flow range (0.048–288 mL/min), validated per ISO 5725-2 guidelines for repeatability
• Robust wetted path constructed from corrosion-resistant SS 316L (1.4404/1.4435), tungsten carbide gears, and nickel-based alloys; seal options include FPM (FKM), EPDM, and FFPM for chemical compatibility assurance
• Integrated 16-bit microcontroller with real-time speed regulation, enabling dynamic flow modulation via analog (0–10 V) or digital (RS-232) interfaces
• Compact footprint (155 × 50 × 69 mm) and lightweight design (~1080 g) facilitate integration into OEM systems, robotic workstations, and confined analytical platforms
• Pressure capability up to 40 bar at higher viscosities (>16 mPa·s), with maximum inlet pressure rated at 5 bar (extendable to 40 bar with customized inlet manifold)

Sample Compatibility & Compliance

The MZR-7205 is compatible with aqueous solutions, organic solvents (e.g., methanol, THF, DMF), oils, lubricants, UV-curable resins, epoxy prepolymers, silicone gels, and pigment dispersions. Its chemically inert wetted materials meet FDA-compliant surface finish standards (Ra ≤ 0.8 µm for SS 316L components) and are suitable for use in GLP- and GMP-regulated environments when paired with audit-trail-capable control software. While not intrinsically rated for explosive atmospheres, optional ATEX-compliant motor variants are available upon request. The pump conforms to CE marking requirements under the Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU. For pharmaceutical applications, its traceable calibration records support alignment with USP Analytical Instrument Qualification protocols.

Software & Data Management

The integrated controller supports deterministic flow programming through external host systems using ASCII-based RS-232 command sets or analog voltage input. Optional HNPM PumpControl Suite (Windows-based) provides graphical interface for multi-segment flow profiling, dose logging, and CSV export of timestamped flow/pressure/speed data. All operations—including start/stop, speed ramping, and fault diagnostics—are timestamped and stored in non-volatile memory, enabling full traceability required under FDA 21 CFR Part 11 when deployed with electronic signature-enabled configurations. Firmware updates are performed via serial interface with checksum verification to ensure integrity.

Applications

• Continuous reagent delivery in flow chemistry reactors and microreactor platforms
• Precise metering of adhesives, sealants, and encapsulants in electronics assembly and medical device manufacturing
• Controlled solvent dispensing in HPLC mobile phase preparation and sample dilution workflows
• Dosing of high-viscosity coatings and inks in R&D-scale spray coating and inkjet printhead characterization
• Vacuum-compatible fluid transfer in thin-film deposition systems (with optional vacuum-rated shaft seal)
• Automated calibration of flow meters and mass spectrometer sample introduction systems
• Low-volume fluid handling in environmental monitoring stations (e.g., nutrient dosing in aquatic toxicity assays)

FAQ

What is the minimum measurable flow rate with guaranteed accuracy?
The MZR-7205 achieves CV < 1% down to 0.048 mL/min (2.88 mL/h) under stabilized thermal and backpressure conditions; lower flows are possible but subject to increased relative uncertainty due to mechanical resolution limits.
Can the pump handle abrasive slurries or particulate-laden fluids?
Standard configurations are not recommended for suspended solids > 10 µm; however, hardened tungsten carbide gear variants and ceramic-lined housings are available as custom-engineered options.
Is the pump suitable for sterile or aseptic processes?
While the wetted path is autoclavable (121 °C, 20 min), full aseptic operation requires validation of seal integrity and post-sterilization calibration; HNPM offers IQ/OQ documentation packages for regulated bioprocessing installations.
How does temperature affect flow accuracy?
Viscosity changes induced by temperature shifts directly impact volumetric output; for critical applications, integration with inline temperature sensors and PID-compensated speed control is advised.
What certifications are provided with the standard unit?
Each unit ships with EU Declaration of Conformity, factory calibration certificate (traceable to PTB/NIST standards), and material compliance documentation (RoHS, REACH, FDA 21 CFR 177.1550 for food-contact polymers).