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The threads that wouldn't die...
- PC reliability?
- Windows, real time
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- Where do we go from here?
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- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
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Control.com member...
Member Information and Posts by roy_matson
Whether we can get better rangeability by using re-ranging feature of smart transmitter?
New Replies:
Furthermore since the DP from an orifice plate is a square root relationship at the bottom end the...
Flow Totaliser
New Replies:
Sorry I haven't used a Modicon in years, should use a double word I think if that's the format for...
I don't have access to your PLC but it's quite simple. Use a dummy value to start with to simulate...
Sure, it's easy. If once an hour you take the flow rate and add it to a register that's...
Distributed CPUs or only distributed I/Os
New Replies:
You should also look at the advantages of Foundation Fieldbus. That gives you the option of doing...
Questions on orifice Plate
New Replies:
"1) We all know that Beta ratio range is from 0.2 to 0.7 . I want to know what has let to this...
What circuit does a typical PLC use for its 4-20mA current source output (internal to the PLC)?
New Replies:
There is no simple answer to that, Just make a source with OP amp. a transistor and a feedback...
PT + SS tube installation in high temperature condition
New Replies:
You just need to isolate the transmitter from the heat with a few feet of tubing. How you place the...
What type of level switch (high level) is most commonly used for furnace oil application in a tank of approx. 5M length and 4 M dia.?
New Replies:
Anon,
Many of the Ultrasonic Gap switches (and I'm sure some tuning forks also) are 2 wire...
A displacer type switch might work well for you. e.g Magnetrol or Static "O"ring mounted...
Finding probes to measure pH directly from 145c process flow
New Replies:
I think you are really pushing the limit. I have used probes above 100C but not that high. Perhaps...
Application of V-cone flow meters for flow measurements in large diameter pipes
New Replies:
Depending on the application another good flowmeter for large pipes is a propeller meter (like a...
For a 24" clean water application I would consider a pitot type flow element, e.g. annubar,...
can anyone explain what and how volt free contacts work?
New Replies:
Hi,
I think "Volt Free Contacts" is just another way of saying "Dry Contacts"...
Please suggest where exactly in a power plant are the following technologies used:
RF Capacitance
DP level measurement
Ultrasonic
Floats & Displacers
Conductivity type level
RF Capacitance
DP level measurement
Ultrasonic
Floats & Displacers
Conductivity type level
New Replies:
The most versatile level transmitter is the DP transmitter, it can be used in all the situations...
I need help finding an adequate sensor
New Replies:
Everyone needs help sometime.
The most accurate instrument I know is a Magnetorestrictive sensor...
Why use AC @ 400Hz in aircraft?
New Replies:
I think you are correct the power to weight ratio is much higher at 400 Hz because the motor can be...
Using a DP type transmitter to measure level of liquid in a tank under vacuum pressure.
New Replies:
Singhbvirk,
You said
> 3. We have checked the wet leg and found the level to be OK. But when...
Decoupling control loops
New Replies:
I'm puzzled as to why you need the back-pressure controllers since they will have no effect on the...
What is use of barrier & isolator in automation system and where they should be used?
New Replies:
Barriers are used in Hazardous locations to power Intrinsic Safe instruments. The barrier will...
The motor is shot and I would like to find a replacement...
New Replies:
Another source of 12V actuators is a Linak
www.linak-us.com
www.linak.ca
They make an...
Please tell me the exact difference between Power Cables and Signal Cables used for Instrumentation Field Applications.
New Replies:
Vahid,
If you are referring to the bare wire that accompanies each pair. Yes, that makes contact...
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