Jihepu ES20K×1D Precision Electronic Balance
| Brand | Jihepu |
|---|---|
| Origin | Shandong, China |
| Model | ES20K×1D |
| Maximum Capacity | 24 g |
| Readability | 1 mg |
| Repeatability | ±1 mg |
| Calibration | Internal Automatic Calibration |
| Sensor Type | Electromagnetic Force Compensation Sensor |
| Interface | RS232 Serial Port |
| Compliance | ISO 9001, OIML R76-1 (Class II) |
| Display | Backlit LCD |
| Weighing Modes | Standard Weighing, Counting, Percentage Weighing, Checkweighing, Density Determination (with optional kit), Hook Weighing (optional) |
| Units | g, mg, ct, oz, lb, %, pcs |
Overview
The Jihepu ES20K×1D Precision Electronic Balance is an entry-level analytical-grade balance engineered for laboratories and industrial quality control environments requiring reliable sub-milligram resolution in a compact, cost-optimized platform. It operates on the principle of electromagnetic force compensation (EMFC), where the mass-induced displacement of a weighing pan is counteracted by a precisely regulated electromagnetic current; the resulting current magnitude is linearly proportional to the applied load and digitally converted into a stable mass reading. With a maximum capacity of 24 g and readability of 1 mg, the ES20K×1D meets the performance criteria for Class II balances per OIML R76-1 and supports routine applications demanding high repeatability (±1 mg) and fast stabilization time (<3 s). Its robust mechanical design incorporates temperature-compensated sensor electronics and internal automatic calibration—activated via front-panel key or scheduled interval—to maintain metrological integrity across ambient fluctuations common in non-climate-controlled QC labs.
Key Features
- Electromagnetic force compensation sensor with imported core components, delivering enhanced long-term stability and linearity over extended operational cycles.
- Backlit LCD display with intuitive icon-driven interface supporting multi-language menu navigation (English, Spanish, French, German).
- Seven built-in weighing modes: standard mass measurement, piece counting (with auto-average piece weight calculation), percentage weighing relative to reference, checkweighing with configurable tolerance zones, net/gross/tare operation, accumulation (summing multiple weighings), and bottom-hook weighing (with optional suspension kit).
- Multi-unit conversion: g, mg, ct (carat), oz (avoirdupois), lb, %, and piece count—enabling seamless transition between pharmaceutical, jewelry, metallurgical, and materials testing workflows.
- RS232 serial interface compliant with EIA/TIA-232-F standards, supporting bi-directional communication with PCs, thermal label printers, or LIMS systems without additional drivers.
- Integrated overload/underload detection with audible and visual alerts, full-range tare function, and auto-zero tracking within ±2% of capacity.
Sample Compatibility & Compliance
The ES20K×1D accommodates standard laboratory sample containers (e.g., weighing boats, crucibles, vials) up to Ø120 mm diameter and 200 mm height. Its draft shield-compatible design permits integration with optional acrylic enclosures for microgram-level measurements in semi-controlled environments. The balance conforms to ISO 9001 manufacturing quality management systems and satisfies metrological requirements outlined in OIML R76-1 for Class II non-automatic weighing instruments. While not certified for GLP/GMP audit trails out-of-the-box, its RS232 output enables traceable data export to validated third-party software meeting FDA 21 CFR Part 11 requirements when paired with appropriate electronic signature and audit log modules.
Software & Data Management
Data acquisition is facilitated through ASCII-based RS232 protocol (9600 baud, 8N1, no handshake), allowing direct integration with Microsoft Excel via terminal emulation or custom scripts (Python, LabVIEW). Optional Windows-compatible data logging software provides timestamped records, statistical summaries (mean, SD, CV%), and CSV export. All transmitted data include instrument ID, date/time stamp, unit code, and gross/net status—supporting basic traceability needs in ISO/IEC 17025-accredited testing laboratories. Firmware updates are performed via PC-connected RS232 using vendor-provided utility tools.
Applications
This balance serves critical roles in raw material verification (e.g., alloy composition checks in foundries), small-part inventory control (precision hardware, aerospace fasteners), pharmaceutical excipient dispensing (pre-formulation studies), precious metal assay preparation, and calibration lab support for cast iron test weights (per ASTM E74). Its counting mode is routinely deployed for electronic component lot verification (SMD resistors, capacitors), while percentage weighing supports formulation consistency checks in polymer compounding and catalyst dosing in R&D pilot plants.
FAQ
What is the recommended environmental condition for optimal performance?
Operate within 15–30 °C ambient temperature, ≤70% RH non-condensing, on a vibration-isolated, level surface away from air currents and electromagnetic interference sources.
Does the balance support external calibration with certified weights?
Yes—external calibration is supported via user-initiated procedure using Class M2 or better weights traceable to NIST or BIPM standards.
Can the RS232 interface be used for real-time data streaming to a database?
Yes, provided the host system implements proper handshaking logic and parses ASCII data packets according to the documented frame structure (STX, data fields, ETX, checksum).
Is the bottom-hook weighing function factory-installed?
No—it requires optional hook assembly (Order Code: ES-HK-01) and firmware activation via service mode.
How often should internal calibration be performed?
Jihepu recommends initiating internal calibration at power-on, after significant ambient temperature shifts (>5 °C), and before critical measurements—though frequency may be adjusted per site-specific SOPs aligned with ISO/IEC 17025 clause 5.5.
