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Avoid False Readings When Vacuum Sensors Fail

Posted by Tim Collins on Sep 11, 2015 11:12:04 AM

  Ever feel like this guy? Damage to sensors and units alike is an inevitable facet of field work that can put undue stress on even a well-prepared crew, especially when time is of the essence. Vacuum sensors are calibrated in air. However, sensor contamination can occur easily in real-world applications leading to failure or false readings. Having multiple back-up vacuum sensors on hand that have already been factory calibrated to your specific vacuum gauge can save time, stress, and avoid the risk of inaccurate readings. Read on!
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Topics: Manufacturing, Calibration, Accuracy, Oil and Gas, Contamination, Transformers

Accuracy of Thermocouple Tubes Without Calibration

Posted by Tim Collins on Mar 12, 2015 12:55:00 PM

Unexpected sensor failures, breakage and contamination happens to all of us. Hopefully you have a spare on hand when a sensor breaks in the field. You quickly switch out your vacuum tubes and proceed without hesitation. Unfortunately it's rarely that easy - there are small electrical differences between each sensor; thus, your backup sensors will produce different readings on different vacuum gauges without calibration.   Unfortunately, factory recalibration isn't always an option at the time. This should raise some logical questions with technicians; how reliable and accurate are the readings produced by backup vacuum tubes? We set out to answer this question by performing an experiment in the DigiVac shop. 
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Topics: Calibration, Accuracy, Researcher topics, Contamination

PID for Vacuum System Automation

Posted by Tom Bassi on Dec 12, 2014 5:55:00 PM

PID is an acronym for using a closed loop feedback system with the terms Proportional, Integral and Derivative.  While it uses calculus-type words, it is straightforward to configure and is what many industrial processes rely on for predictable automation.  It works on the principal of minimizing the error between the current vacuum reading and the desired set point vacuum pressure.   While PID can work on any closed system, it is also very useful for vacuum systems.  The balancing act is tuning
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Topics: Vessel Downtime, Manufacturing, Calibration, Semiconductor, Surface Treatment, Food/Beverage

What Technology is Best for Precision Vacuum Measurement?

Posted by Tom Bassi on Aug 20, 2014 10:00:00 AM

INTRODUCTION: Any time you try to do a job with inaccurate data, it will take longer and cost more. You know this deep down, but if your gauge is sub-par, maybe you're just a bit attached to that ol' hunk-o-metal you've been using. There are many industry discussion groups out there with posts from seasoned professionals in the vacuum industry which urge that technicians should not opt for cheap equipment, which often sacrifices accuracy in vacuum measurement. If the inaccuracies are great enough,  a job will never get done properly. For this reason, it is important for professionals and technicians who 
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Topics: HVAC, Calibration, Accuracy

The best way to calibrate a vacuum gauge..with and without pressure

Posted by Tom Matthews on Aug 18, 2014 8:00:00 AM

The best way to calibrate a vacuum gauge when pressure is available is to compare it to a standard.
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Topics: HVAC, Calibration, Accuracy

7 Easy Steps To Finding Leaks and Moisture in HVAC Systems

Posted by Tim Collins on Aug 14, 2014 4:52:00 PM

INTRODUCTION: When troubleshooting an HVAC system, finding leaks and moisture can sometimes take longer than fixing them, especially if the initial diagnosis is wrong and repeat trips to the customer are needed. Follow these steps to get fast, reliable answers from the analytics in your vacuum gauge. You can also watch a video of these steps in action, in the field, from a 30-year veteran who says this new process makes his life a whole lot easier! And we didn't pay him to say that, honestly.....
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Topics: HVAC, Calibration, Accuracy

Are Your Vacuum Gauges NIST calibrated? See Why It Matters

Posted by Tom Bassi on Jun 5, 2014 3:29:00 PM

The National Institute of Standards and Technology (NIST), is a measurement standards laboratory whose mission is to maintain the integrity and consistency of measurement standards in the US. NIST standards ensure consistency of measurement and are applied to digital vacuum instrumentation. Technical requirements are published in Handbook 44 that provides the "Specifications, tolerances, and other technical requirements for weighing and measuring devices". Um, HELLO vacuum gauge manufacturers....take a listen here.... As a vacuum consumer, why is this important to you? You want to make sure that your vacuum gauge is consistent and reliable, 
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Topics: Calibration, Accuracy