Before putting a professional used gas chromatograph into operation, the following maintenance and testing items should be carried out to ensure normal operation: 1. Detector-related checks: Clean contaminated detectors; verify detector temperature normalcy and perform aging if required; inspect ion signal lines and amplifier circuit boards for faults. 2. Carrier gas and flow path system inspection: Ensure the carrier gas system works properly and the flow path is unobstructed. 3. Chromatographic column assessment: Confirm the column's performance meets operational needs. 4. For GC-MS configurations: Conduct vacuum leak detection and tuning; replace mechanical pump oil; clean the ion source; replace worn filaments. 5. Specific component checks: For instance, inspect the polarization ring of FID detectors to resolve issues like low sensitivity or ignition difficulties. If you need professional support for these maintenance and testing tasks, our company Jiangxi Biology provides comprehensive solutions including repair, maintenance, rental, and dust cleaning services for gas chromatographs of brands such as Agilent, Thermofisher, Waters, etc. We also offer related accessories, consumables, and professional chromatographic application consulting to ensure your used instrument operates stably and efficiently.