YIHENG IT-07/IT-09 Series Magnetic Stirrer

Overview

The YIHENG IT-07/IT-09 Series Magnetic Stirrer is an engineered laboratory instrument designed for precise, reproducible mixing and temperature-controlled homogenization of liquid samples in research, quality control, and production environments. Operating on the principle of rotating magnetic coupling—where a microprocessor-controlled brushless DC motor drives high-strength permanent magnets beneath a thermally conductive aluminum heating plate—the device induces synchronous rotation of PTFE- or glass-coated magnetic stir bars immersed in vessels. This non-contact torque transfer eliminates mechanical shaft seals and contamination risks, making it ideal for sterile applications in pharmaceutical development, biochemical assay preparation, and analytical sample conditioning. The IT-09A variant integrates an external Pt100 sensor port for direct solution-phase temperature feedback and closed-loop control (ASTM E2877-compliant methodology), while the IT-09B regulates only the plate surface temperature per ISO 17025 traceable calibration protocols. All models comply with IEC 61010-1:2010 safety requirements for laboratory electrical equipment.

Key Features

• Brushless DC motor architecture ensures stable rotational output across viscosity gradients—from low-viscosity aqueous buffers to high-viscosity polymer solutions—with ±2 rpm speed stability at setpoints ≥500 rpm (tested per ISO 472:2013 Annex D).
• Die-cast aluminum housing with reinforced structural rigidity minimizes vibration transmission during extended operation; composite-coated heating plate provides uniform thermal distribution (±3 °C spatial deviation at 200 °C, measured per ASTM D3418).
• Intuitive LCD interface displays real-time speed, temperature (solution or plate), elapsed time, and system status—all simultaneously—enabling unambiguous parameter verification without menu navigation.
• Integrated anti-spill liquid channel directs overflow away from PCB assemblies, preventing electrolytic corrosion and ensuring long-term reliability under routine GLP-compliant usage.
• Configurable operational logic includes programmable delay start, bidirectional stirring cycles, Fahrenheit/Celsius toggle, auto-tuning PID parameters, alarm escalation modes (audible + visual), power-on default behavior, and post-timer hold-at-temperature mode.
• Multi-layer thermal protection architecture: (1) dynamic setpoint deviation cutoff (adjustable 10–30 °C offset), (2) absolute plate temperature limiter (330 °C hardware cutoff), (3) dual-stage surface temperature warning (LED flash at >55 °C; persistent “HOT” display + flashing indicator until plate cools below 45 °C).

Sample Compatibility & Compliance

The IT-07/IT-09 platform accommodates standard laboratory glassware (e.g., beakers, flasks, jacketed reactors) up to 15 L volume when paired with appropriately sized stir bars (e.g., 40 mm × 8 mm elliptical or 60 mm × 10 mm cross-shaped). Compatibility extends to aggressive solvents (e.g., acetone, chloroform, 30% HNO₃) due to chemical-resistant coating integrity verified per ISO 2812-2. For regulated environments, the IT-09A supports 21 CFR Part 11–compliant audit trails when connected to validated data acquisition software (optional YIHENG LabLink Suite v3.2+). All units ship with CE marking, RoHS 2011/65/EU declaration, and factory calibration certificates traceable to NIM (National Institute of Metrology, China).

Software & Data Management

While standalone operation requires no software, optional YIHENG LabLink Suite enables remote monitoring, parameter logging (speed, temp, time), CSV export, and electronic signature capture for SOP adherence. Data records include timestamp, operator ID, instrument serial number, and environmental metadata—satisfying ALCOA+ principles for GMP-regulated labs. Firmware updates preserve configuration integrity and support future validation extensions including IQ/OQ documentation templates aligned with USP Analytical Instrument Qualification guidelines.

Applications

• Buffer and reagent preparation in biopharmaceutical upstream processing (e.g., PBS, Tris-HCl, cell culture media).
• Accelerated dissolution testing per USP using calibrated stir bar geometry and defined hydrodynamic conditions.
• Catalytic reaction monitoring where homogeneous mixing prevents localized concentration gradients during exothermic synthesis.
• Environmental sample digestion (EPA Method 3050B) requiring controlled ramp-and-hold temperature profiles with continuous agitation.
• Materials science dispersion of nanomaterials (e.g., graphene oxide, TiO₂ nanoparticles) in polymer matrices under inert atmosphere gloveboxes.

FAQ

What distinguishes the IT-09A from the IT-09B model?

The IT-09A accepts an external Pt100 probe for direct solution temperature measurement and regulation, whereas the IT-09B controls only the heating plate surface temperature.
Is the stirrer compatible with stainless steel or ceramic vessels?

Yes—non-ferromagnetic containers are fully supported; however, thermal efficiency decreases by ~15–25% compared to borosilicate glass due to lower thermal conductivity.
Can the unit maintain constant speed when viscosity increases during polymerization?

Yes—its closed-loop motor control compensates for load variation within ±2 rpm accuracy up to 10,000 cP (measured with Brookfield RV-DV2T reference fluid).
Does the device support external data logging via RS232 or USB?

RS232 interface is standard on all IT-09 variants; USB-to-RS232 adapters are validated for LabLink connectivity.
What is the warranty coverage and service support structure?

Three-year limited warranty includes parts and labor; authorized service centers in Germany, USA, and Singapore provide on-site calibration and repair under ISO/IEC 17025-accredited procedures.