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This post was last edited by zhengpeichun on 2018-3-11 at 21:43. How to use a mixed gas mixing cabinet correctly – Wofei Gas Mixer. A gas mixer, also known as a gas proportioning device or mixed gas mixing cabinet, is a high-flow two-gas mixing unit designed specifically for laser cutting and welding applications. It is mainly used in conjunction with centralized gas supply systems; this device allows the two gases required to be mixed according to specific requirements, resulting in a uniform mixed gas. Next, WoFei, a professional manufacturer of gas mixers, will give you a brief introduction on how to use the mixed gas proportioning cabinet correctly How to use a mixed gas mixing cabinet correctly? How does it work? First, pay attention to the precautions: ② This automatic mixing and proportioning cabinet should operate at an input pressure of 0.8 MPa or higher; otherwise, normal gas mixing and operation cannot be ensured. ② Please use it in accordance with the operating instructions. If you encounter any problems, please contact the manufacturer. Technical support: 4008-755-698. I. Working principle: This mixing cabinet first equalizes the pressure of the gases to be mixed, then uses mixing valves to combine the gases in proportion. The resulting mixed gas is sent to a storage tank until the desired maximum pressure value is reached, at which point the mixer stops operating. As gas is drawn out of the reservoir, the pressure will drop until it reaches the set lower pressure limit, at which point the mixer will turn on again and start operating. This working method allows the mixed gas to be output at any proportion between zero and maximum flow rate, without any change in the mixing accuracy. It is therefore crucial to accurately determine the output flow rate of the gas mixing cabinet, to ensure that the flow rate of the gas emitted does not exceed the capacity of the cabinet. II. The specific installation and operation steps are as follows: (1) Place the mixing cabinet firmly on a horizontal surface, and connect the mixed gas cabinet to the pipeline busbar. ⑵Close all pipeline valves, and adjust the input pressure to 0.8–1.2 MPa based on operating conditions of an output pressure of 0.5 MPa and a maximum output flow rate of 200 m3/h. ⑶Adjust the ratio knob to the desired value. ⑷Open all valves and ensure that the control gas is turned on (argon is the control gas in this system). ⑸Set the control pressure value to 0.7 MPa. ⑹Connect the power supply; at this point, the light on the button switch will glow, indicating that the power is connected. If the yellow light comes on along with an alarm sound, it means that the gas supply pressure is below the minimum required pressure level. The input pressure must be increased until the pressure gauge on the panel shows a normal pressure value, after which the system can operate properly. ⑺Once all adjustments have been completed, the valve at the work station can be opened; it should be allowed to vent first before being used normally. ⑻For short-term shutdowns, simply switch the switch on the mixing cabinet to the “off” position. For longer-term shutdowns, close the gas supply valve to stop the supply of control gas and empty it; once all pressure readings are zero, then shut down the mixing cabinet. III. How to maintain it? This mixing device does not require routine daily maintenance. To ensure fault-free operation, it should be inspected daily to confirm that: (1) the gas fault alarm device is activated. ⑵ Controlling the pressure value is correct. ⑶ The set value for the mixed gas is correct.