JIHEPU OA2000plus Overhead Digital Stirrer
| Brand | JIHEPU |
|---|---|
| Model | OA2000plus |
| Type | Overhead Digital Stirrer |
| Max. Mixing Volume | 20 L |
| Speed Range | 30–2000 rpm |
| Speed Accuracy | ±1 rpm |
| Motor Power | 120 W |
| Max. Viscosity Handling | 20,000 cP |
| Torque | 120 N·cm |
| Shaft Clamp Range | Ø0.3–10 mm |
| Display | Dual real-time LCD (set speed & actual speed, timer) |
| Timer Range | 0–9999 min |
| Construction Material | Anodized aluminum housing, SUS316L wetted parts |
| Power Supply | 100–240 V AC, 50 Hz |
| Dimensions (L×W×H) | 200 × 300 × 720 mm |
| Net Weight | 9 kg |
| Thermal Protection | Integrated overheat sensor |
| Standard Impeller | One 4-blade stainless steel impeller |
Overview
The JIHEPU OA2000plus Overhead Digital Stirrer is an engineered solution for precise, reproducible mechanical agitation in laboratory-scale mixing and dispersion processes. Designed around a high-efficiency brushless DC motor and microprocessor-based closed-loop speed control architecture, it delivers stable rotational output across its full 30–2000 rpm range—enabling consistent shear application in low- to high-viscosity systems up to 20,000 cP. Unlike magnetic stirrers limited by heat transfer and torque constraints, this overhead design eliminates coupling losses and supports scalable impeller configurations for optimized fluid dynamics in volumes from 50 mL to 20 L of aqueous or non-aqueous media. Its rigid anodized aluminum frame and precision-machined gear train ensure minimal vibration and long-term mechanical stability—critical for extended batch operations in QC, formulation development, and process optimization workflows.
Key Features
- High-resolution dual-line LCD display showing real-time actual speed, set speed, elapsed time, and remaining timer duration—no manual interpretation required.
- Electronic rotary encoder with tactile feedback enables rapid, stepless speed adjustment to ±1 rpm resolution—ideal for method-sensitive protocols requiring fine kinetic control.
- Brushless DC motor delivers quiet operation (10,000-hour service life without maintenance intervals.
- Integrated thermal cut-off circuitry automatically suspends operation upon sustained coil temperature rise beyond safe thresholds—protecting both motor integrity and sample integrity.
- Drill-chuck mounting system accepts standard shaft diameters from Ø0.3 mm to Ø10 mm, supporting interchangeable impellers (e.g., propeller, paddle, anchor, turbine) per ISO 8502-3 compatibility guidelines.
- Memory function retains last-used parameters—including speed setpoint and timer value—across power cycles, reducing setup time between sequential experiments.
Sample Compatibility & Compliance
The OA2000plus accommodates diverse rheological profiles encountered in pharmaceutical suspension preparation, polymer emulsion synthesis, nanoparticle dispersion, and agrochemical formulation. Wetted components—including impeller, shaft, and chuck—are constructed from electropolished SUS316L stainless steel, compliant with USP Class VI biocompatibility requirements and resistant to corrosion from organic solvents, acidic/basic reagents, and saline solutions. While not certified to ISO/IEC 17025 or GLP as a standalone instrument, its repeatable torque delivery and traceable speed calibration support adherence to internal SOPs aligned with ASTM D1893 (viscosity measurement), ISO 2557-2 (dispersion stability), and FDA 21 CFR Part 11 when paired with validated data logging procedures.
Software & Data Management
The OA2000plus operates as a standalone analog-digital hybrid controller with no proprietary software dependency. All operational parameters are locally managed via front-panel interface; however, the device supports optional RS-232 or USB-to-serial adapters (sold separately) for integration into LabVantage, Empower, or custom Python-based acquisition scripts. When interfaced, real-time speed and timer data can be logged with timestamped metadata—facilitating audit-ready records for GMP environments. The built-in timer function meets basic ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate) when manually documented alongside batch records.
Applications
- Preparation of homogeneous colloidal dispersions in nanomaterial research (e.g., graphene oxide, TiO₂, SiO₂ suspensions).
- Viscosity-controlled blending of polyurethane prepolymers and crosslinker systems prior to casting or foaming.
- Emulsification of oil-in-water formulations in cosmetic and pharmaceutical development (creams, lotions, injectables).
- Accelerated aging studies of asphalt binders and bituminous composites under controlled shear conditions.
- Standardized mixing of reference standards for turbidity, particle size, or zeta potential validation protocols.
- Batch-wise dissolution testing of poorly soluble APIs using paddle-over-disc or basket methodologies per USP .
FAQ
Is the OA2000plus suitable for continuous operation over 8 hours?
Yes—the brushless motor and aluminum heat-sink chassis enable uninterrupted duty cycles exceeding 12 hours at ≤1500 rpm under ambient laboratory conditions (20–25°C, <60% RH).
Can I use glass or PTFE-coated impellers with this unit?
Yes—provided the shaft diameter falls within the 0.3–10 mm clamping range and the impeller’s mass does not exceed the 120 N·cm torque limit at maximum speed.
Does the device comply with electromagnetic compatibility (EMC) directives?
It meets IEC 61326-1:2013 Class B emission limits for laboratory equipment and carries CE marking for EU market access.
What calibration documentation is provided?
A factory-verified speed calibration certificate (traceable to NIST-equivalent national metrology institutes) is included, listing measured deviation at 100, 500, 1000, and 2000 rpm.
Is firmware upgrade capability available?
No—firmware is embedded and non-upgradable; however, hardware revision history and service bulletins are maintained on the manufacturer’s technical support portal.
