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Types	Related items	Instructions for Use
Goods Receipt and Inspection	Cylinder pressure	Confirm that the pressure inside the cylinder and the labeled value differ by ± after receiving the goods. 0.5MPa For special low-pressure gases, such as those with abnormal pressure and confirmed by the supplier.
	Steel cylinder appearance	Confirm whether the cylinder body and valve are damaged.
	Steel Cylinder Inspection Period	Steel cylinders should be used within their inspection period, which can be referenced at GB/T 13004-2016 Regular inspection and assessment of steel seamless gas cylinders, GB 13077-2004 Regular Inspection and Assessment of Seamless Aluminum Alloy Gas Cylinders.
	Calibration gas validity period	Confirm the validity period of the standard gas and ensure it is used within the specified timeframe.
Steel Cylinder Storage	Steel cylinder storage	Store horizontally; when stored vertically, ensure anti-tip measures are in place. Flammable gases and oxidizing gases must be stored separately.
Steel Cylinder Storage	Storage	When storing standard gases, avoid keeping them at temperatures below 15 ℃, higher than 40 ℃; Humidity ≤ 80% , if the gas mixture components are easily soluble in water or react with water (such as hydrogen chloride, formaldehyde, etc.), humidity ≤ 40%。
Pipe Material Selection	Pressure Regulator Selection	Based on the cylinder valve information, select the appropriate interface for the regulator inlet (e.g., w21.8，G5/8 , left-handed, right-handed, and so on ) Based on the properties of the gas components, select an appropriate pressure regulator: For highly reactive gases (such as hydrogen chloride and hydrogen sulfide), stainless steel regulators should be used; for inert gases, copper regulators are suitable.
	Pressure Reducer Assembly	Ensure the regulator is in the closed position before venting (a loose knob indicates it's closed).
	Pipeline Selection	Based on the properties of standard gas components, stainless steel pipelines can be selected for conventional components, while highly adsorptive components should use PTFE pipelines. , You can also choose to use passivated tubing, but in any case, avoid using rubber tubing.
System Leak Testing	Leak Testing and Handling	Before sampling, first ensure the sample injection system is airtight. You can use a leak detector, leak test fluid, or a pressure-holding test to verify this—only proceed with sampling once you’ve confirmed that the system is completely leak-free.
Air Intake System	Replacement method	Based on your own conditions and component requirements, use vacuum pumping (vacuum pump evacuating the pipeline)— Step-up/step-down ( Repeatedly opening and closing the cylinder valve while venting the sample gas, or using a continuous purging method (maintaining a constant flow rate to purge the pipeline) )
Air Intake System	Sample Injection Method	According to the properties of the components, air can affect the quantitative calibration gas; therefore, valve injection should be chosen, and the tubing should be thoroughly purged before injection. Additionally, since the injection system may adsorb the components in the calibration gas, needle injection can be used as long as safety is ensured.

Customer FAQs and Troubleshooting Steps

Frequently Asked Questions	Solution measures
40L The bottle cap of the steel cylinder can't be opened.	Use tools like hammers to tap the bottle cap, restoring the threaded groove to its proper condition. For flammable gases, opt for wooden or rubber hammers.
Chromatography: Hydrogen fails to ignite during use.	Detect water accumulation in the detector; heat the detector at high temperature; verify that the hydrogen-to-air ratio is within the normal range; and ensure that the input pressures of hydrogen and air meet the instrument's requirements.
The regulator or cylinder valve outlet shows severe corrosion after use.	The steel cylinder is filled with corrosive hydrogen chloride gas; before and after sample injection, the tubing should be purged with dry, clean gas to prevent the formation of corrosive acids upon contact with water.
The gas alarm readings used underground are unstable.	When the nitrogen-balanced methane standard gas values are unstable, use an air-balanced methane standard gas instead.
Standard gases containing highly polar components have inaccurate values.	The environment requires low humidity, and the injection system should minimize adsorption. Fluoropolymer tubing can be used, keeping the tubing length as short as possible. Before injection, first purge the system with clean gas, then thoroughly flush it with the sample gas to ensure proper replacement.
Low-sulfide values are on the lower side.	Injection sampling yields the best results; for valve sampling, it is recommended to use PTFE or passivated tubing, and ensure thorough purging of the sampling system or increase the sample gas injection flow rate.
Oxygen and nitrogen trace component values are slightly elevated.	Check the gas tightness of the sample injection system using a pressure-rise and pressure-drop displacement method, minimizing the number of displacement cycles. 5 More than once.
Using standard gases beyond their expiration date or exceeding the specified pressure.	When the standard gas exceeds its minimum operating pressure or expiration date, the value cannot be used as a standard reference.
Unit of mass concentration mg/m3 , Numerical Deviation	Our company's出厂 standard gases comply with 0 Given a temperature in °C, the molar volume is calculated as 22.4L/mol Calculate, if based on 20 °C, Molar Volume 24.05L/mol Calculation, numerical deviation 1.074 Twice.
The standard solution contains additional components.	The purity of the raw materials affects chromatographic quantification; however, if extraneous components do not interfere with the target component, they can be used.
Standard air pressure varies significantly.	Pressure formulation is based on the standard gas composition and concentration. 10 Design the saturated vapor pressure at ℃; customers need to confirm the pressure before placing an order.