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Member Information and Posts by Roy_matson
How can I access a PLC network via cell?
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I thought you guys would jump all over this one.
I have since spoken with a cell modem supplier...
PIT installation question
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Condensate pots are usually only used on condensing vapours like steam. There is no need for a pot...
Sudden drop in level ?
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It sounds as though the pressure transmitter you are measuring the level with is connected to the...
from the No Power Source At the Tank department...
Wanted: Simple and Inexpensive Automated Pump Control System SolutionLooking for a simple and inexpensive pump control system to automatically fill water tank. No power source at the tank. Pump is 700 meters from tank.
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Google is your friend
http://www.remotecontroltech.com/applications/pumpcontrol.aspx...
It seems as though you are leaning towards a fully automatic system so you need either a pair of...
Explain the Working principle for Displacer type and Float type level transmitters.
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Nikhil,
I'm not nit picking but we don't know for sure if the transmitter is in a...
Quick Answer
Floats Float, Displacers Don't
The float will follow the level so you should be...
Trying to figure out how to calibrate this absolute pressure transmitter.
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There is no connection on the Low side because it's under vacuum, if you cracked that you would...
Flow transmitter Recalibration on-line
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You will need to tell us more about your meter before we could even take a guess....
how to adjust the linearity error if provided
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You didn't say linearity of what.
For Bourdon tube pressure gauges and old style controllers...
I need to know how to convert a 1-3vdc input to a 4-20ma. input
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Forgive me if I double post
A 125 Ohm resistor in series with a diode will give 1.1 to 3.1 Volts...
from the instrumentation,process control department...
Software to measure flow/velocity of overflow from weirSoftware to measure flow/velocity overflow from a weir using a fixed camera
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Why not just bite the bullet and buy one of the ultrasonic transmitters that are designed for just...
RTD Cable Specs
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That's kind of a no brainer, should I have said they should be the same size as well?
You only...
Use the same spec you use for a single pair twisted cable for 4-20 mA only make it 3 conductor.
...
1 mile long 4-20mA current loop bounces.
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Brett,
I think you might be on to something with the bouncing caused by current inrush when...
Whether we can get better rangeability by using re-ranging feature of smart transmitter?
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Furthermore since the DP from an orifice plate is a square root relationship at the bottom end the...
Flow Totaliser
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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
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You should also look at the advantages of Foundation Fieldbus. That gives you the option of doing...
Questions on orifice Plate
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"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)?
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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
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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.?
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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
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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
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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?
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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
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The most versatile level transmitter is the DP transmitter, it can be used in all the situations...
I need help finding an adequate sensor
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Everyone needs help sometime.
The most accurate instrument I know is a Magnetorestrictive sensor...
Why use AC @ 400Hz in aircraft?
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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.
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Singhbvirk,
You said
> 3. We have checked the wet leg and found the level to be OK. But when...
Decoupling control loops
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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?
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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...
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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.
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Vahid,
If you are referring to the bare wire that accompanies each pair. Yes, that makes contact...
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"Ubi non accusator, ibi non judex."
(Where there is no police, there is no speed limit.)
-- Roman Law, trans. Petr Beckmann (1971)
