Blogging team for Dan's Tips, the education and tech tips blog for Lesman Instrument Company

Homepage: http://danstips.wordpress.com

The detrimental effects of moisture and how to avoid it


Unexpected moisture in your process lines can cause costly problems.
From corrosion, rust, and oxidation to frozen control lines, failed pneumatic systems, and increased wear on moving parts, the presence of unwanted water in your process lines and instrumentation can be incredibly damaging.
My associate over at RAECO spells it all out for you. Check it out!

Originally posted on Tom's Tips:

When someone mentions issues with moisture, the first thing that comes to my mind is mold. If your basement has ever flooded, you can relate. This article is not about that.

In the manufacturing and process world, moisture can cause significant problems, even in small 3272360-moisture-drops-on-the-blue-transparent-surfaceconcentrations. The phrase “water and oil don’t mix” came to being for a reason (well, technically it can under the right pressure, but you get the idea).

Water doesn’t always play well with others. It can cause corrosion in valves, pipes and motors. It will react with a number of chemicals like lithium, sodium, silver, ammonia, chlorine, hydrogen sulfide and sulfur dioxide. It can destroy catalysts in hydrocarbon and petrochemical processing. And of course, it will freeze.

So what does that mean to your processes?

  • If you have pneumatic controls and tools, it can cause corrosion and can also plug pneumatic orifices, valves and actuators
  • If you…

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Marking Charts on Honeywell Paperless Process Recorders

Back in the day of paper charts, it was simple to mark a recorder chart – the operator pulled a pen out of his pocket and wrote on the chart, or the quality person rubber-stamped the chart.

Even with “paperless” charts on Honeywell’s Trendview, X-Series and G-Series digital recorders, it’s still easy to annotate.

Read the rest of this entry »

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How do I read the Modbus fault code in my Honeywell RM7800 flame safety controller?

More and more people are using Modbus to get data from their instruments and controllers back into their control systems for reporting, alarming and troubleshooting.

And while I can’t be there to help you set up your Modbus master, I can give you 13 rules and some general practice advice for communicating to any Modbus RTU device.

Read the rest of this entry »

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Why has 4-20 mA gained so much acceptance and survived so long?

Last month, I presented a webinar for our customers. At the end of Control 101, when we opened the session up for questions, a customer asked about making the choice between 4-20 mA and digital signal outputs.  It got me thinking about this list I put together a while back — one that I pull out whenever customers ask me “Is 4-20 mA still valid?”

The answer: Yes, it is. And here are the 18 reasons I came up with… so far. Read the rest of this entry »

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