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In recent years, the market of imported second-hand gas chromatographs such as Shimadzu and Agilent has gradually expanded, mainly because users prefer the performance of these instrument.
However, in the course of so many years of operation, it is found that many users are not clear about their own needs when purchasing second-hand instruments, and often feedback poor performance and quality after purchasing many dispute.
So, what are the key factors to consider when purchasing a second-hand gas chromatograph? How to efficiently and accurately express your testing needs? Here are a few reference factors I hope can help you! Key factors to consider when purchasing a second-hand gas chromatographWhat substances to analyze and detect? When purchasing equipment, you should consider which substances to detect and analyz.
In this case, you need to analyze the sample, the composition and state of the sample itself, whether it is gaseous, liquid, solid or Can the mixed state be directly analyzed by gas chromatograph? Whether there is smoke, suspended solids, high Buddha point components and corrosive components in the sampl.
In order to consider how the sample is collected and obtained, how to carry out the pretreatment of the sample; whether the measured component is thermally unstable, easy to decompose, or easy to catalyze reactio.
Will changes in time, temperature, pressure, et.
cause changes in the measured components; is the sample source easy? Allowable sample consumption is helpful for selecting the injection method; components not to be analyzed and the approximate concentration range; as well as the number of samples that need to be analyzed per day, and the interval between two analyse.
The purpose of the analysis Consider what the purpose of the analysis i.
Quantitative analysis? In what range? - constant (10-1`~10-3); semi-trace (10-3~10-5); trace (10-5~10-7); trace (10-6~10-9) or ultra-trace quantitative (≤10-9); or qualitative analysis? Is the analyte known or unknown, is there a standard? Or do you need quantitative precision and analytical accuracy? Because if it is a semi-quantitative requirement, it is much simple.
Frequency of use If the frequency of use is very high, you have to choose a better one, so as not to always need maintenance and delay wor.
Look at the repeatability and durability of the gas chromatograp.
In this way, the instrument can meet the requirements of high frequency of us.
Your own budget It is important to consider how much money you can spen.
The performance is very good, and it is not enough if it does not meet its own financial capacit.
Secondly, you should also know the "he", and knowing the "he" is to know the seller's informatio.
You should learn more about the brands and models of gas chromatographs currently on the market, their features and approximate market prices, as well as information on after-sales servic.
Collect various samples and data It is recommended to collect samples and data of various types of gas chromatographs (including accessories) to make basic preparations for the final selectio.
The positioning of the purchasing unit It is necessary to consider what the positioning of the purchasing unit i.
Is it a research institute? Such high requirements; or a monitoring and analysis center? It is required to be accurate and reliable; or it is used for on-site analysis of the first line, which has high requirements for repeated reproductio.
Analysis of methods For the same sample, in theory, there may be analysis methods of various instrument.
From the performance/price ratio of instruments, operating characteristics, and maintenance services, the reasons for choosing gas chromatograph analysis are liste.
Relevant standards It is necessary to consult to find out whether there are national standards, industry standards, enterprise standards or foreign reference materials for the samples to be analyze.
If there are, the standards will give the functions and technical requirements of the instruments that should be used in general situation.
This is very important!What are the existing conditions? For a new analytical task, there are many units, and the existing instruments can be properly modified and the analytical methods are re-establishe.
1 Are there any analysts who have done similar samples around the work unit? If there are any analysts, it will be of direct help to the selection and the establishment of chromatographic analysis methods in the futur.
1 Is the task long-term or short-term? Is the task long-term? Or short term? Depending on the task, how much to invest and which instrument to use? Do you want to make long-term plans? 1 The working efficiency of instruments and equipment It is necessary to consider the working efficiency and operating costs of the selected instruments and equipmen.
However, in the course of so many years of operation, it is found that many users are not clear about their own needs when purchasing second-hand instruments, and often feedback poor performance and quality after purchasing many dispute.
So, what are the key factors to consider when purchasing a second-hand gas chromatograph? How to efficiently and accurately express your testing needs? Here are a few reference factors I hope can help you! Key factors to consider when purchasing a second-hand gas chromatographWhat substances to analyze and detect? When purchasing equipment, you should consider which substances to detect and analyz.
In this case, you need to analyze the sample, the composition and state of the sample itself, whether it is gaseous, liquid, solid or Can the mixed state be directly analyzed by gas chromatograph? Whether there is smoke, suspended solids, high Buddha point components and corrosive components in the sampl.
In order to consider how the sample is collected and obtained, how to carry out the pretreatment of the sample; whether the measured component is thermally unstable, easy to decompose, or easy to catalyze reactio.
Will changes in time, temperature, pressure, et.
cause changes in the measured components; is the sample source easy? Allowable sample consumption is helpful for selecting the injection method; components not to be analyzed and the approximate concentration range; as well as the number of samples that need to be analyzed per day, and the interval between two analyse.
The purpose of the analysis Consider what the purpose of the analysis i.
Quantitative analysis? In what range? - constant (10-1`~10-3); semi-trace (10-3~10-5); trace (10-5~10-7); trace (10-6~10-9) or ultra-trace quantitative (≤10-9); or qualitative analysis? Is the analyte known or unknown, is there a standard? Or do you need quantitative precision and analytical accuracy? Because if it is a semi-quantitative requirement, it is much simple.
Frequency of use If the frequency of use is very high, you have to choose a better one, so as not to always need maintenance and delay wor.
Look at the repeatability and durability of the gas chromatograp.
In this way, the instrument can meet the requirements of high frequency of us.
Your own budget It is important to consider how much money you can spen.
The performance is very good, and it is not enough if it does not meet its own financial capacit.
Secondly, you should also know the "he", and knowing the "he" is to know the seller's informatio.
You should learn more about the brands and models of gas chromatographs currently on the market, their features and approximate market prices, as well as information on after-sales servic.
Collect various samples and data It is recommended to collect samples and data of various types of gas chromatographs (including accessories) to make basic preparations for the final selectio.
The positioning of the purchasing unit It is necessary to consider what the positioning of the purchasing unit i.
Is it a research institute? Such high requirements; or a monitoring and analysis center? It is required to be accurate and reliable; or it is used for on-site analysis of the first line, which has high requirements for repeated reproductio.
Analysis of methods For the same sample, in theory, there may be analysis methods of various instrument.
From the performance/price ratio of instruments, operating characteristics, and maintenance services, the reasons for choosing gas chromatograph analysis are liste.
Relevant standards It is necessary to consult to find out whether there are national standards, industry standards, enterprise standards or foreign reference materials for the samples to be analyze.
If there are, the standards will give the functions and technical requirements of the instruments that should be used in general situation.
This is very important!What are the existing conditions? For a new analytical task, there are many units, and the existing instruments can be properly modified and the analytical methods are re-establishe.
1 Are there any analysts who have done similar samples around the work unit? If there are any analysts, it will be of direct help to the selection and the establishment of chromatographic analysis methods in the futur.
1 Is the task long-term or short-term? Is the task long-term? Or short term? Depending on the task, how much to invest and which instrument to use? Do you want to make long-term plans? 1 The working efficiency of instruments and equipment It is necessary to consider the working efficiency and operating costs of the selected instruments and equipmen.
