Gas Chromatography Installation and Commissioning Guide
First, the installation of the chromatograph:
1. Requirements for the chromatograph analysis room:
- The room must be free from strong magnetic fields, flammable gases, or corrosive substances.
- Indoor temperature should be maintained between 5°C to 35°C, with humidity below 85% relative humidity. Good air circulation is essential. It's recommended to install air conditioning if possible.
- A sturdy working platform is needed to support the entire instrument. A cement platform (0.6–0.8 m high) is ideal. Ensure it's at least 0.5–1.0 m away from the wall for easy wiring and maintenance.
- The power supply should have a capacity of around 10KVA. Avoid sharing the power with high-power devices or equipment with unstable power consumption. Grounding is crucial—use a grounding rod (0.5–1.0 m long) in wet soil or salt solution, ensuring a resistance of less than 1 ohm.
2. Gas source preparation and purification:
- High-pressure gas cylinders (available in large cities) should be prepared in advance. Each cylinder color represents a specific gas and cannot be interchanged. Common gases include nitrogen, hydrogen, and air. Use two cylinders per gas for redundancy.
- Hydrogen generators and oil-free air compressors can also be used. For hydrogen generators, increase the drying pipe volume (over 450 cm³) with 5A molecular sieve. Air compressors need additional filtration and a mix of 5A molecular sieve and activated carbon in the drying tube.
- Gas purity is critical, especially for electron capture detectors, which require 99.999% pure gas.
3. Unpacking and setup:
- After unpacking, check all accessories against the list and store spare parts properly.
- Place the instrument on the platform according to the manual, connect all cables and connectors, and finally link the recorder and data processor. Be careful not to misconnect any components.
4. External gas line connection:
- Install pressure regulators on gas cylinders. Two oxygen and one hydrogen regulator are typically used. Ensure proper sealing with O-rings and check for leaks after installation.
- Connect the gas lines using stainless steel or pressure-resistant plastic tubes (φ3×0.5 mm). Plastic tubes are easier to handle but require stainless steel liners and proper sealing at joints.
- Perform leak tests by adjusting the pressure and checking for drops in the low-pressure gauge. If a drop occurs, identify and fix the leak.
5. Leak detection and system check:
- Before operation, ensure the gas path is airtight. This prevents unstable performance and potential safety hazards like explosions.
- To test, block the column and adjust the carrier gas pressure to 0.35–0.6 MPa. Monitor the pressure over 30 minutes. If it drops, there’s a leak.
- Inspect the main unit with soapy water for leaks in the hydrogen and air paths, then dry the area thoroughly.
After connecting the gas path and instrument, proceed with the following checks and adjustments:
1. Turn on the carrier gas flow and set the flow rate to 20–30 ml/min.
- Power on the main unit and check for unusual noises. Some systems perform self-diagnosis, indicating normal or faulty conditions.
- Verify each temperature control (column, injector, detector) to ensure stability across different settings, especially for precise temperature control (0.01°C accuracy).
Proper installation and commissioning of the gas chromatograph are essential for accurate and reliable results. Always follow the manufacturer's guidelines and conduct thorough checks before starting operations.
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