Eldex Optos 1LM1HM High-Pressure Constant-Flow Piston Pump
| Brand | Eldex |
|---|---|
| Model | 1LM1HM |
| Flow Rate | 10 mL/min |
| Maximum Pressure | 6000 psi (414 bar) |
| Viscosity Range | up to 500 cP |
| Temperature Range | up to 120 °C |
| Repeatability | ±0.3% |
| Inlet/Outlet | 1/8" Swagelok |
| Power Supply | 100–230 VAC, 50/60 Hz, 80 W |
| Dimensions (W×H×D) | 10 × 23 × 24 cm |
| Weight | 5.3 kg (standard), 6.4 kg (pulse-dampened version) |
Overview
The Eldex Optos 1LM1HM is a high-precision, high-pressure constant-flow piston pump engineered for demanding laboratory and analytical applications requiring stable, pulse-minimized fluid delivery under elevated pressure conditions. Based on positive displacement reciprocating piston technology, the 1LM1HM delivers accurate volumetric flow control across a wide dynamic range—specifically designed for continuous infusion in HPLC, preparative chromatography, microfluidic systems, reaction monitoring, and controlled reagent dosing. Its robust architecture integrates a 316 stainless steel housing, PEEK or polyethylene (PE) piston assembly, and sapphire-tipped plunger for exceptional chemical resistance and long-term dimensional stability. The pump operates with a high-resolution stepper motor drive system that minimizes flow pulsation while maintaining precise speed control—critical for baseline stability in sensitive detection environments.
Key Features
- High-pressure capability: Rated for continuous operation up to 6000 psi (414 bar), supporting applications in ultra-high-performance liquid chromatography (UHPLC) and high-backpressure synthesis reactors.
- Pulse-reduction engineering: Precision-machined sapphire plunger tip and optimized cam profile reduce mechanical hysteresis; optional pulse-dampened configuration available (6.4 kg variant) for ultra-low ripple flow output.
- Integrated piston wash system: Fully automated solvent flush cycle removes crystalline deposits from piston seal interfaces—significantly extending seal life when handling buffer salts or organic-inorganic mixtures. Compatible with 20% deionized water in methanol.
- Dual-mode control interface: Local operation via intuitive LCD panel with dedicated SET, RUN/STOP, and parameter navigation keys; remote command support via analog inputs (0–5 V DC or 4–20 mA) and RS232 serial protocol for integration into SCADA or LIMS-controlled workflows.
- Thermal and rheological resilience: Capable of sustained operation at fluid temperatures up to 120 °C and handling Newtonian and mildly shear-thinning fluids up to 500 cP viscosity without flow deviation or seal extrusion.
- Modular fluid path design: Standard 1/8″ Swagelok inlet/outlet ports ensure compatibility with industry-standard tubing and fittings; optional configurations support PEEK-wetted surfaces for aggressive solvents or high-purity applications.
Sample Compatibility & Compliance
The 1LM1HM is validated for use with aqueous buffers, organic solvents (including acetonitrile, methanol, THF), and low-concentration acid/base solutions commonly employed in analytical separations and catalytic screening. All wetted materials—including 316SS body, PE or PEEK piston, sapphire plunger, and fluoropolymer seals—meet USP Class VI biocompatibility requirements and are compatible with ISO 10993-5 cytotoxicity testing protocols. The pump’s repeatability of ±0.3% supports compliance with ASTM D3417 (viscosity calibration), ISO 5725 (accuracy and precision of measurement methods), and GLP/GMP documentation standards where audit-trail-capable controllers are deployed in conjunction with compliant software platforms.
Software & Data Management
While the 1LM1HM operates as a standalone instrument, its RS232 interface enables bidirectional communication with third-party control software (e.g., LabVIEW, MATLAB, or custom Python-based automation scripts). Analog I/O supports real-time feedback integration into PID-regulated process loops. When deployed in regulated environments, the pump may be paired with FDA 21 CFR Part 11-compliant data acquisition systems to enforce electronic signature, audit trail, and user access controls—ensuring traceability of all flow setpoints, runtime logs, and maintenance events.
Applications
- Preparative and analytical HPLC/UHPLC mobile phase delivery
- Controlled reagent addition in continuous-flow synthesis reactors
- Calibration fluid dispensing for viscometer and densitometer validation
- Microreactor feed systems requiring stable sub-mL/min to 10 mL/min flow rates
- High-pressure permeation studies in membrane characterization setups
- Automated sample introduction in ICP-MS and hyphenated LC-MS workflows
FAQ
What is the maximum recommended viscosity for continuous operation?
The 1LM1HM is rated for Newtonian fluids up to 500 cP at operating temperatures ≤120 °C. For non-Newtonian or particulate-laden fluids, consult Eldex technical documentation for shear-rate-dependent performance curves.
Can the pump be used in inert atmosphere gloveboxes?
Yes—the unit features no internal venting or air-cooled components; external power and signal cables can be routed through standard feedthroughs. Optional nitrogen-purged electronics enclosure is available upon request.
Is firmware upgrade capability supported?
Firmware updates are performed via RS232 using Eldex-provided utilities; version history and release notes are maintained under NDA for qualified OEM and institutional customers.
What maintenance intervals are recommended for the piston seal system?
Under typical aqueous/organic usage, scheduled seal inspection is advised every 6 months or after 2000 hours of cumulative runtime; the integrated wash cycle extends service life by ≥40% compared to non-flushing equivalents.
Does the pump meet CE or UL safety certification requirements?
The 1LM1HM complies with IEC 61010-1:2010 for laboratory electrical equipment and carries CE marking. UL listing is available for specific regional configurations upon order specification.
