Detection method for air tightness of gas flow channel, passive gas sampling method and passive sampling device
A technology of gas flow and detection method, which is applied in the test of fluid tightness, liquid/vacuum degree of liquid tightness measurement, sampling device, etc. Avoid the effect of adsorption
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Embodiment 1
[0055] Such as Figure 1-2 As shown, this embodiment relates to a method for detecting the airtightness of a gas flow channel, which includes the following steps:
[0056] S1. Prepare a gas flow assembly including several flow control assemblies V1...Vn, an air guide assembly 1, a pressure gauge 2, and a flow regulating assembly 3. One end of each flow control assembly is connected to the air guide assembly 1, the flow rate The regulating component 3 forms an independent gas flow channel (for example, the flow control component V1 forms a gas flow channel S1 with the gas guiding component 1 and the flow regulating component 3; the flow control component V2 forms a gas flow channel with the gas guiding component 1 and the flow regulating component 3 S2...), and the other end of each flow control component (such as flow control component V1, flow control component V2 ... flow control component Vn) is correspondingly connected to a closed container (such as container P1, containe...
Embodiment 2
[0071] This embodiment also provides a method for detecting the airtightness of the gas flow channel, such as Figure 4a Shown, its difference with embodiment one is:
[0072] S1. Prepare a gas flow assembly including a flow control assembly 1', a pressure gauge 2 and a flow adjustment assembly 3 (excluding the gas guiding device 1 in Embodiment 1), and as Figure 4b As shown, the flow control assembly 1' has a common end 101 and several mutually isolated outlet ends 102, 103, 104, 105...N, the common end 101 communicates with an outlet end to form an independent fluid channel S1', S2', ... Sn', each fluid passage is communicated with the flow adjustment assembly 3 to form a gas flow passage (such as the fluid passage S1' and the flow adjustment assembly 3 form the gas flow passage S1; the fluid passage S2' and the flow adjustment assembly 3 form a gas flow passage S1; The flow adjustment assembly 3 forms a gas flow channel S2...); each outlet port of the flow control assembl...
Embodiment 3
[0086] This embodiment provides a passive sampling method for gas, referring to Figure 1-2 , which includes the following steps:
[0087] S1. Prepare several airtight containers P1...Pn;
[0088] S2. According to the detection method described in Embodiment 1, the airtightness detection of the gas flow channel is completed;
[0089] S3. After determining that the airtightness of at least one gas flow channel is intact, set each of the flow control components to be opened at least once (such as more than 2 times) and the time point of each opening (such as setting Open at 10 o'clock or 11 o'clock in the morning, or determine the time of each opening by timing (such as timing 10 minutes later) and the time of each continuous opening (such as the time of each opening lasts 10-15s (preferably 12s);
[0090] And S4, connecting the air intake end of each flow control assembly to a gas environment (such as atmospheric environment) with a predetermined pressure through the air guid...
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Abstract
Description
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Application Information
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