Preparation method for nitrogenous hybrid active standard gas

A standard gas and mixed standard technology, which is applied in the field of preparation of standard mixed gas, can solve problems such as measurement deviation and instability, and achieve the effects of more efficient preparation process, simplified operation, and improved customer satisfaction

Inactive Publication Date: 2016-12-14
上海神开气体技术有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

During the user's use, the measurement deviation will also be caused by the instability of the value

Method used

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  • Preparation method for nitrogenous hybrid active standard gas

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preparation example Construction

[0023] The invention provides a method for preparing a nitrogen-containing mixed active standard gas, the method comprising the following steps:

[0024] Step 1, connect the bottle to be inflated to the mixed standard gas filling device, open the bottle valve, fill the bottle with a nitrogen-containing mixed active standard gas with a concentration higher than the predetermined concentration of the finished product, and close the bottle valve after reaching 0.5-3 MPa;

[0025] Step 2, remove the cylinder and let it stand for 48-96 hours;

[0026] Step 3, release the air bottle, and vacuum for 3-15 minutes;

[0027] Step 4, close the vacuum valve, open the filling valve, and fill in the nitrogen-containing mixed active standard gas with a concentration higher than the predetermined concentration of the finished product;

[0028] Step 5, filling high-purity nitrogen in proportion so that the nitrogen-containing mixed active standard gas in the bottle to be inflated reaches a pr...

Embodiment

[0033] Taking the preparation of 20×10-6 mol / mol (20ppm) hydrogen sulfide standard gas in nitrogen in a 4-liter bottle as an example, the preparation process is as follows:

[0034] 1. Take a pre-treated (baked at 80°C, vacuumed for 16-24 hours), and a 4-liter bottle to be inflated that has passed the inspection before filling.

[0035] 2. Connect the bottle to be inflated to the mixed standard gas filling device, open the bottle valve, and fill the bottle with 10 times the concentration of the finished product, that is, 200×10-6 mol / mol (200ppm) hydrogen sulfide mixed gas in nitrogen, until Close the bottle valve after 1Mpa.

[0036] 3. Remove the cylinder and let it stand for 72 hours.

[0037] 4. Connect the bottle to be inflated to the device, release the air bottle, and vacuum for 3 minutes.

[0038] 5. Close the vacuum valve, open the filling valve, and fill in 200×10-6 mol / mol (200ppm) hydrogen sulfide mixed gas in nitrogen, 44g.

[0039] 6. Charge 396g of high-purit...

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PUM

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Abstract

The invention discloses a preparation method for nitrogenous hybrid active standard gas. The preparation method includes the steps of 1), feeding a to-be-filled gas bottle into a hybrid standard gas filling device, opening a bottle valve and filling the nitrogenous hybrid active standard gas higher than predetermined concentration of a finished product to 0.5-3MPa prior to closing the bottle valve; 2), taking off the gas bottle and standing the same for 48-96 hours; 3), emptying the gas bottle and performing vacuum pumping for 3-15 minutes; 4), closing a vacuum pumping valve, opening the filling valve and filling the nitrogenous hybrid active standard gas higher than predetermined concentration of the finished product; 5), filling high-purity nitrogen proportionally to enable the nitrogenous hybrid active standard gas in the gas bottle to reach predetermined concentration; 6), closing the filling device and the bottle valve and taking off the gas bottle to complete preparation. The preparation method used for preparation of the nitrogenous hybrid active standard gas, production circle is greatly shortened from average two weeks to one week, more convenience in operation is achieved, preparation process is more standard, and user experience is facilitated.

Description

technical field [0001] The invention relates to a preparation process of a standard mixed gas, in particular to a preparation method of a nitrogen-containing mixed active standard gas. Background technique [0002] Hydrogen sulfide detector is an important safety equipment in mud logging operation and inspection well operation. The hydrogen sulfide standard gas in nitrogen is used to calibrate the hydrogen sulfide detector to ensure the normal operation of the detector. However, when preparing hydrogen sulfide standard gas in nitrogen, the hydrogen sulfide molecule and the inner wall of the gas cylinder often undergo adsorption and desorption, resulting in a decrease in the stability and uniformity of the prepared standard gas. In order to ensure the stability of factory inspection data, manufacturers need to test repeatedly, prolonging the production cycle. During the user's use, the measurement deviation will also be caused by the instability of the value. Contents of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/38
CPCG01N1/38
Inventor 刘艳戎海伟黄赛杰孙子文
Owner 上海神开气体技术有限公司
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