HNPM MZR-7209 Ex Intrinsically Safe Micro-Dosing Peristaltic Pump
| Brand | HNPM |
|---|---|
| Origin | Germany |
| Model | MZR-7209 Ex |
| Flow Rate | 0.048 – 225 mL/min |
| Speed Range | 1 – 4700 rpm |
| Precision (CV) | < 1 % |
| Viscosity Range | 0.3 – 5,000 mPa·s |
| Max Differential Pressure | 30 bar (at 1 mPa·s), 40 bar (≥16 mPa·s) |
| Max Inlet Pressure | 5 bar (10 bar with optional fluid seal module) |
| Displacement per Revolution | 48 µL |
| Minimum Dose Volume | 30 µL |
| Motor | 24 V DC, 2 A, 53 W, Encoder Resolution: 500 pulses/rev |
| Wetted Materials | SS 316L (1.4404 / 1.4435), Tungsten Carbide, Ni-based alloys |
| Shaft Seal | Graphite-reinforced PTFE + SS 316L |
| Static Seals | FPM (Viton), optional EPDM or FFPM |
| Enclosure Rating | ATEX II 2G c T4 X |
| Ambient Temp | 0 – 40 °C |
| Operating Temp | −5 – +40 °C |
| Weight | ~2700 g |
| Cable Length | 10 m |
Overview
The HNPM MZR-7209 Ex is an intrinsically safe, brushless DC-driven micro-dosing peristaltic pump engineered for precise, low-pulse fluid handling in hazardous environments classified under ATEX Zone 1 and Zone 2. Unlike conventional peristaltic pumps relying on elastomeric tubing compression, the MZR-7209 Ex employs a patented rotary micro annular gear displacement principle—effectively combining volumetric precision with shear-sensitive fluid compatibility. This architecture eliminates tubing fatigue, pulsation-induced measurement drift, and lubrication dependency, making it uniquely suited for continuous metering or discrete dosing of aggressive, non-lubricating, or high-viscosity media—including solvents, adhesives, oils, gels, and pharmaceutical formulations. Its compact footprint (<295 mm length, ~2.7 kg) and integrated explosion-proof motor comply fully with Directive 94/9/EC (ATEX 95), enabling direct installation in process lines where ignition risks from electrical equipment must be rigorously mitigated.
Key Features
- Intrinsically safe design certified to ATEX II 2G c T4 X for use in gas atmospheres (Group IIB, T4 temperature class)
- Volumetric accuracy with coefficient of variation (CV) < 1 % across full flow range—validated per ISO 5725-2 for repeatability in regulated environments
- Rotary micro annular gear mechanism ensures near-zero pulsation (< ±0.5 % peak-to-peak amplitude) and minimal shear stress—critical for shear-thinning polymers and biological suspensions
- Wetted path constructed from corrosion-resistant materials: ASTM A276 Grade 316L stainless steel (1.4404 / 1.4435), tungsten carbide (WC-Co), and nickel-based alloys; static seals available in FPM (Viton), EPDM, or perfluoroelastomer (FFPM) for chemical compatibility mapping
- High-resolution optical encoder (500 pulses/rev) enables closed-loop speed control and traceable dosing event logging—supporting GLP/GMP audit requirements
- Wide operational viscosity range (0.3–5,000 mPa·s) accommodates water-like solvents and structured gels without flow rate recalibration
Sample Compatibility & Compliance
The MZR-7209 Ex delivers consistent performance with aqueous solutions, organic solvents (e.g., methanol, acetone), hydrocarbon oils, reactive monomers, UV-curable resins, and thixotropic pastes. Its non-contact fluid path prevents cross-contamination and eliminates risk of rotor seizure in dry-run conditions. All materials comply with EU Regulation (EC) No. 1935/2004 for food contact and USP Class VI biocompatibility testing. The pump meets electromagnetic compatibility (EMC) per EN 61326-1 and carries CE marking under the Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU. Documentation includes full ATEX technical file, material declarations (RoHS/REACH), and calibration certificates traceable to PTB (Physikalisch-Technische Bundesanstalt).
Software & Data Management
The pump interfaces via standard 0–10 V analog input or RS-485 Modbus RTU protocol for integration into PLC-controlled batch systems or SCADA architectures. Optional HNPM PumpControl software provides real-time flow monitoring, dose counter logging, and event-triggered data export (CSV/Excel). Audit trail functionality records timestamped start/stop commands, speed setpoints, and encoder pulse counts—fully compliant with FDA 21 CFR Part 11 requirements when deployed with electronic signature-capable host systems. Firmware updates preserve configuration integrity and support future validation protocols including ASTM E2500-13 (User Requirements Specification alignment).
Applications
- Continuous reagent addition in catalytic hydrogenation reactors and flow chemistry platforms
- Precision dispensing of adhesives, sealants, and conductive pastes in electronics assembly
- Dosing of UV-curable inks and functional coatings in gravure and inkjet printing lines
- Controlled delivery of APIs and excipients in lab-scale lyophilization and spray drying feed systems
- Low-volume solvent transfer in automated sample preparation for GC-MS and HPLC analysis
- Vacuum-compatible metering in thin-film deposition and plasma etching auxiliary lines
FAQ
What certifications does the MZR-7209 Ex hold for hazardous area operation?
It is certified to ATEX Directive 94/9/EC as II 2G c T4 X, suitable for Zone 1 and Zone 2 gas environments (IIB group, surface temperature ≤135 °C). Full test reports are available upon request.
Can the pump handle abrasive slurries or particulate-laden fluids?
While not designed for solids transport, its ceramic-coated gears and hardened tungsten carbide components tolerate suspended particles up to 50 µm in diameter at concentrations <0.5 wt%, provided upstream filtration (≤25 µm) is implemented.
Is remote firmware update supported?
Yes—via RS-485 interface using HNPM’s secure bootloader protocol. Updates preserve user-defined parameters and require digital signature verification.
How is volumetric accuracy verified during qualification?
Accuracy is validated using gravimetric measurement per ISO 8503-2, with certified reference weights (class E2) and analytical balances (0.01 mg resolution), repeated over ≥30 consecutive cycles at multiple flow points.
What maintenance intervals are recommended for long-term reliability?
No scheduled replacement of wetted components is required within 10,000 operating hours under nominal load. Annual inspection of shaft seal integrity and encoder alignment is advised per IEC 60079-17 maintenance guidelines.
