Troubleshooting Vacuum Gauge Fluctuations in Chemical Vapour Deposition Unit

  • Thread starter shourie.j
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In summary, the speaker is experiencing issues with their chemical vapour deposition unit for coating silver thin films. The pirani gauge is not showing readings and fluctuating, while the penning gauge shows readings. The speaker is unsure if the gauge needs to be cleaned or if there is an electronic problem, and if the vacuum pump is causing the issue. They are seeking suggestions for troubleshooting the problem and also mention the possibility of the chemical being reactive with the gauge material.
  • #1
shourie.j
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Hi Everybody

am using chemical vapour deposition unit for coating silver thin films.
The pirani gauge is not showing readings, t he readings are fluctuating, but the penning gauge shows reading. am not able to make out where is the problem.

1. is the gauge needs to be cleaned due to contamination, or some electronic problem in the display?
2. is the problem with the vacuum pump, since the pressure is not created, the pirani gauge doesn't show the reading?

can you give me a suggestion how to troubleshoot my problem.
 
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  • #2
Even if the vacuum pump didn't work the gauge should still read some kind of pressure.
Is the chemical you are using reactive with what ever material the gauge is made of.
 

Related to Troubleshooting Vacuum Gauge Fluctuations in Chemical Vapour Deposition Unit

1. What is causing the vacuum gauge fluctuations in my chemical vapour deposition unit?

The most common cause of vacuum gauge fluctuations in a chemical vapour deposition unit is a leak in the vacuum system. This could be due to a faulty seal, loose connections, or a damaged component. It is important to carefully inspect and troubleshoot the entire vacuum system to identify and address any potential leaks.

2. How can I determine if the vacuum gauge readings are accurate?

To determine the accuracy of vacuum gauge readings, it is important to perform regular calibrations and comparisons with a known reference gauge. This will help identify any discrepancies and ensure that the readings are reliable. It is also important to follow proper operating procedures and maintain the vacuum gauge to ensure accurate readings.

3. Can changes in temperature affect vacuum gauge readings?

Yes, changes in temperature can affect vacuum gauge readings. As temperature increases, the molecules in the system become more active and can create a higher pressure, leading to fluctuations in the vacuum gauge readings. It is important to monitor and control the temperature in the system to minimize its impact on vacuum gauge readings.

4. What other factors can cause vacuum gauge fluctuations?

In addition to leaks and temperature changes, other factors that can cause vacuum gauge fluctuations include changes in gas flow rates, changes in the pumping speed of the vacuum system, and the presence of contaminants in the system. It is important to carefully monitor and control these factors to ensure stable and accurate vacuum gauge readings.

5. How can I troubleshoot vacuum gauge fluctuations?

To troubleshoot vacuum gauge fluctuations, it is important to first check for any leaks in the vacuum system and address them accordingly. Next, check for any changes in temperature, gas flow rates, and pumping speed and make adjustments as needed. It is also important to regularly clean and maintain the vacuum system to prevent the build-up of contaminants that can affect gauge readings. If the fluctuations persist, it may be necessary to replace faulty components or consult with a specialist for further troubleshooting steps.

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