Grant PSU-20i Triple-Mode Orbital Shaker

Overview

The Grant PSU-20i Triple-Mode Orbital Shaker is an engineered platform for precise, programmable mechanical agitation in life science laboratories. Designed around a robust direct-drive DC motor and precision-machined eccentric cam mechanism, it delivers three distinct motion profiles—orbital, reciprocating, and pulsed vibration—within a single compact chassis. Unlike conventional shakers limited to fixed motion types, the PSU-20i employs microprocessor-controlled actuation to generate reproducible waveforms across its full operational envelope. Its 20 mm orbital diameter ensures uniform energy transfer across sample vessels while minimizing shear-induced cell damage during suspension culture or immunoassay incubation. The system operates at ambient conditions (5–40 °C), making it suitable for benchtop use in QC labs, academic research facilities, and bioprocess development suites where temperature control is managed externally or not required.

Key Features

• Triple-mode operation: independently selectable orbital (20–250 rpm), reciprocating (0–360° tilt, programmable cycle duration), and pulsed vibration (0–5° oscillation, 0–5 s pulse width)
• Multi-platform architecture: supports up to three interchangeable platforms simultaneously, each configurable with dedicated clamping or non-slip surfaces
• High-fidelity programmability: full sequence programming for mode transitions, dwell times, and amplitude parameters via intuitive dual-line LCD interface
• Load-optimized drive system: rated for continuous operation under 8 kg total load, with dynamic torque compensation to maintain speed stability across varying vessel mass distributions
• Low-noise, low-EMI design: 12 V DC power input minimizes electrical interference in sensitive instrumentation environments and enables integration into enclosed incubator cabinets or biosafety workstations
• Auto-shutdown timer: adjustable from 1 minute to 96 hours with audible alert and visual confirmation, compliant with GLP documentation requirements for time-bound protocols

Sample Compatibility & Compliance

The PSU-20i accommodates diverse vessel formats through six standardized accessory platforms—including PUP-400 (adjustable-height universal platform), PP-20 (non-slip surface for Petri dishes), and P6-1000 (six-position clamp for 1 L bottles). Its modular design supports ISO 8573-1 clean air compatibility when operated inside laminar flow hoods, and its absence of moving belts or lubricated gears eliminates particulate shedding—critical for sterile cell culture applications. While not a regulated medical device, the unit meets IEC 61010-1 safety standards for laboratory equipment and incorporates overcurrent/overtemperature protection circuits. Its programmable parameters align with common SOP frameworks referenced in ASTM E2500 (verification of laboratory equipment) and support audit-ready traceability when paired with external logging systems.

Software & Data Management

The PSU-20i operates as a standalone instrument with embedded firmware; no PC connectivity or proprietary software is required for routine operation. All settings—including mode selection, rpm, tilt angle, pulse duration, and timer values—are stored in non-volatile memory and retained after power cycling. For laboratories requiring electronic recordkeeping, the shaker’s deterministic behavior allows synchronization with external data acquisition systems via TTL-triggered start/stop signals (available upon request with optional I/O module). The dual-line LCD provides real-time feedback on active mode, current setpoint, elapsed time, and remaining countdown—enabling unambiguous operator verification per FDA 21 CFR Part 11 principles when used in GMP-compliant workflows.

Applications

• Cell culture maintenance: gentle orbital mixing of adherent and suspension lines in T-flasks, roller bottles, and multiwell plates
• Immunoassay processing: uniform antigen-antibody binding enhancement in ELISA, Western blotting, and lateral flow assay development
• Molecular biology workflows: consistent resuspension of plasmid pellets, bacterial transformation mixes, and PCR master mixes
• Environmental microbiology: homogenization of water and soil extracts prior to membrane filtration or MPN analysis
• Biopharmaceutical QC: dissolution testing support for lyophilized formulations and buffer exchange validation in pre-formulation studies
• Educational labs: hands-on demonstration of mechanical agitation effects on reaction kinetics, sedimentation rates, and biofilm dispersion

FAQ

Can the PSU-20i be used inside a CO₂ incubator?

Yes—its 12 V DC input, sealed electronics, and lack of heat-generating components make it compatible with standard humidified CO₂ incubators when installed on stable internal shelving.
Is calibration traceable to national standards?

While the PSU-20i does not include built-in calibration certification, its rpm output is factory-verified using NIST-traceable tachometric reference instruments; users may perform periodic verification with handheld optical tachometers per ISO/IEC 17025 guidelines.
What maintenance is required?

No scheduled maintenance is specified; the brushless DC motor and hardened steel cam assembly are designed for >20,000 hours of continuous operation without lubrication or part replacement.
Are third-party platforms supported?

Only Grant-certified accessories (PUP-400, PP-20, P30-100, etc.) are validated for mechanical resonance avoidance and load distribution integrity; non-OEM platforms may compromise speed accuracy or induce premature wear.
Does it meet electromagnetic compatibility (EMC) requirements for EU labs?

Yes—the unit complies with EN 61326-1:2013 for laboratory equipment and carries CE marking under the EU Machinery Directive 2006/42/EC.