Grant Instruments PHMP/PHMP-4 Microplate Thermal Mixer

Overview

The Grant Instruments PHMP and PHMP-4 Microplate Thermal Mixers are precision-engineered benchtop instruments designed for simultaneous temperature-controlled incubation and orbital mixing of microplates and low-volume tubes. Based on Peltier-driven bidirectional heating architecture—comprising both a heated platform and a thermally regulated lid—the system establishes a tightly controlled microenvironment that minimizes condensation, suppresses evaporation, and ensures exceptional thermal uniformity across the entire plate surface. Unlike conventional water baths or dry-block heaters, this design eliminates thermal gradients between wells and enables reproducible kinetic assays, enzymatic reactions, cell-based assays, and nucleic acid hybridizations under precisely defined thermal and mechanical conditions. The device operates within an ambient range of 4–40 °C, making it suitable for integration into cold rooms, CO₂ incubators, and standard laboratory environments without compromising performance or safety.

Key Features

• Bidirectional thermal control: Independent heating of both platform and lid maintains uniform temperature distribution (±0.5 °C across plate area) and prevents condensation on plate lids—critical for long-duration assays and low-volume reactions.
• Precise orbital mixing: Adjustable speed from 25 to 1200 rpm with 10 rpm resolution and a consistent 2 mm orbital radius ensures gentle yet effective homogenization of viscous or particulate-containing samples.
• Programmable timer with audible alarm and auto-shutdown: Supports run durations from 1 minute to 96 hours in 1-minute increments, enabling unattended overnight protocols compliant with GLP workflows.
• Dual-line LCD interface: Displays setpoint and real-time values for temperature and speed simultaneously; intuitive keypad navigation allows rapid parameter adjustment without menu nesting.
• Low-voltage DC drive architecture: Delivers quiet, vibration-damped operation (<45 dB(A)) and compatibility with incubator door gaskets—enabling seamless installation inside controlled-environment chambers.
• Two scalable configurations: PHMP accommodates two standard 96-well or 384-well microplates; PHMP-4 supports up to four plates, optimizing throughput for high-density screening applications.

Sample Compatibility & Compliance

The PHMP series is compatible with all ANSI/SLAS-standard microplates (including skirted, semi-skirted, and unskirted formats), PCR plates, deep-well plates, and 0.2–2.0 mL tube racks (with optional adapters). Its operating temperature range (ambient +5 °C to 60 °C) and stable thermal performance meet requirements for ISO 15197:2013 (in vitro diagnostic devices), ASTM E2927-19 (thermal validation of lab equipment), and USP endotoxin assay support conditions. The absence of exposed heating elements and integrated overtemperature protection align with IEC 61010-1 safety standards for laboratory electrical equipment. When used in regulated environments, the non-volatile parameter memory and timestamped operation log (via optional software interface) support 21 CFR Part 11-compliant data integrity practices.

Software & Data Management

While the PHMP/PHMP-4 operates as a standalone instrument, optional RS-232 or USB connectivity enables integration with LabArchives, Benchling, or custom LIMS platforms via ASCII command protocol. Firmware supports remote readback of current temperature, speed, remaining time, and error codes—facilitating automated workflow logging and audit-trail generation. All parameter changes are retained in non-volatile memory across power cycles, and the device records last-used settings for immediate restart—reducing setup time in multi-user facilities. For GxP environments, optional calibration reports traceable to UKAS-accredited standards are available upon request.

Applications

• Enzyme-linked immunosorbent assays (ELISA) and immunoassay incubation with agitation to enhance antigen-antibody binding kinetics.
• qPCR and RT-qPCR master mix equilibration prior to thermal cycling, reducing pipetting-induced variability.
• Cell-based assays requiring synchronized temperature and mixing, including calcium flux, reporter gene expression, and cytotoxicity screening.
• Nucleic acid hybridization (e.g., Southern/Northern blotting pre-hybridization steps) where uniform thermal exposure prevents probe degradation.
• Protein solubilization and ligand-binding studies involving viscous lysates or membrane preparations.
• Quality control testing in pharmaceutical manufacturing, including dissolution profile verification and stability-indicating assays.

FAQ

Can the PHMP-4 be operated inside a CO₂ incubator?

Yes—the low-voltage DC power supply and sealed electronics allow safe use inside humidified incubators; ensure the external AC adapter remains outside the chamber.

Is condensation control validated across the full temperature range?

The heated lid maintains a differential of +2–3 °C above the platform temperature, effectively suppressing condensation at all setpoints from 4 °C to 60 °C.

Does the device support ramp-and-soak temperature profiles?

No—this is a single-setpoint thermal mixer; for multi-step thermal protocols, external controller integration via RS-232 is required.

What calibration documentation is provided?

Each unit ships with a factory calibration certificate referencing NIST-traceable standards; UKAS-certified recalibration services are available annually.

Are replacement parts (e.g., lid seals, plate carriers) available?

Yes—Grant Instruments supplies OEM-matched consumables and wear components with documented shelf life and lot traceability.