Dynamic Calibration System LHGM-2012 by Lihero
| Brand | Lihero |
|---|---|
| Origin | Hunan, China |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Domestic (China) |
| Model | LHGM-2012 |
| Pricing | Available Upon Request |
Overview
The Lihero LHGM-2012 Dynamic Calibration System is a precision gas dilution and calibration platform engineered for traceable, repeatable generation of calibrated gas mixtures in laboratory, environmental monitoring, and industrial emissions testing environments. It operates on the laminar flow differential pressure principle—utilizing mass flow controllers (MFCs) with integrated real-time temperature and absolute pressure compensation—to deliver stable, high-fidelity gas flow control without dependency on stabilized ambient conditions. Unlike static permeation or gravimetric methods, this system enables dynamic, on-demand generation of reference gas concentrations across a wide range (ppm to % v/v), supporting both single- and multi-point calibration protocols for analyzers such as NOx, SO2, CO, O3, and VOC detectors. Its architecture complies with fundamental metrological requirements outlined in ISO 6145-7 (gas mixtures by dynamic blending) and supports traceability to NIST-traceable primary standards when used with certified source gases.
Key Features
- Automated MFC Calibration Routine: Built-in self-calibration sequence adjusts zero and span of each mass flow controller against internal reference conditions, reducing inter-channel deviation to ≤±0.8% of full scale—critical for multi-gas ratio accuracy.
- Multi-Port Certified Gas Interface: Eight standardized CGA-690/CGA-395 inlet ports accommodate certified calibration gases (e.g., EPA Protocol Gases, ISO 6141-certified blends), eliminating manual hose reconfiguration and minimizing cross-contamination risk during sequential calibrations.
- Post-Operation Purge Cycle: Programmable nitrogen (N₂) purge function activates automatically after calibration completion, flushing sample lines, MFC sensor chambers, and mixing manifolds to prevent residue buildup and adsorption-related drift—extending operational stability between maintenance intervals.
- Industrial Touchscreen HMI: 7-inch capacitive LCD interface with intuitive icon-driven navigation, real-time flow visualization (L/min, sccm), and event-logged operation history; firmware supports multi-language UI (English, Spanish, German) and configurable user access levels (Operator, Technician, Admin).
Sample Compatibility & Compliance
The LHGM-2012 is compatible with non-corrosive, non-condensing gases including N₂, O₂, Ar, He, CO, CO₂, CH₄, NO, NO₂, SO₂, and hydrocarbon standards (e.g., C₂H₆, C₃H₈) at pressures up to 300 kPa(g). It is not rated for use with halogenated compounds, H₂S, NH₃, or reactive silanes. All wetted materials—316L stainless steel tubing, VCR fittings, and elastomer-free diaphragm MFCs—meet ASTM F2237 for ultra-high-purity gas systems. The system design adheres to ISO/IEC 17025:2017 clause 6.4.9 (equipment verification) and supports GLP-compliant audit trails when connected to external LIMS via RS-485 Modbus RTU or Ethernet TCP/IP.
Software & Data Management
Embedded firmware includes a local database storing ≥10,000 calibration events with timestamps, operator ID, gas IDs, target/actual flow values, and pass/fail status per channel. Export options include CSV and PDF reports compliant with EPA Method 205 and EN 14181 QA/QC documentation requirements. Optional PC-based Calibration Manager Software (v3.2+) provides remote configuration, trend analysis of MFC drift over time, and automated report generation aligned with FDA 21 CFR Part 11 electronic record controls—including digital signatures, audit trail review, and role-based permissions.
Applications
- Calibration and verification of continuous emission monitoring systems (CEMS) per EPA Performance Specification 2 and EN 15267-3.
- Field validation of portable gas analyzers used in occupational health (NIOSH Method 0600) and ambient air quality networks (EPA SLAMS).
- Method development and uncertainty assessment for ISO 16000-6 (indoor air VOC analysis) and ISO 10156 (gas cylinder safety classification).
- Reference standard generation for laboratory accreditation under ISO/IEC 17025, particularly for gas analyzer calibration laboratories seeking scope expansion.
FAQ
Does the LHGM-2012 require external temperature or barometric pressure sensors?
No—the integrated thermal mass flow sensors incorporate on-chip temperature and absolute pressure transducers, enabling automatic compensation without external environmental monitoring.
Can it generate gas mixtures with humidity control?
Not natively; the system delivers dry gas blends. For humidified standards, integration with an external saturator (e.g., Vaisala HUMICAP-based unit) is required upstream of the dilution manifold.
What certification documentation is provided with shipment?
Each unit ships with a Factory Calibration Certificate (traceable to national standards), RoHS/CE Declaration of Conformity, and ISO 9001-compliant manufacturing records.
Is firmware update capability available remotely?
Yes—updates are delivered via secure HTTPS portal; version history, checksum verification, and rollback functionality are embedded in the bootloader.
What is the recommended maintenance interval for MFC recalibration?
Annual verification against a NIST-traceable flow standard is advised; the built-in auto-calibration routine does not replace periodic metrological validation.
