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Control.com member...
Member Information and Posts by Roy_matson
Topic: Continuous process industries, DCS questions.
from the Forum department...
Control Valve Position Command Signal
Originally posted by Gary on 11 August, 2014 - 2:28 pm
Looking for a device that generate control valve position signal for open loop control
New Replies:
I believe you are looking for a Manual Loading Station, I haven't seen one for years. If you are...
Topic: Continuous process industries, DCS questions.
from the Production department...
controlling flow between two vessels
Originally posted by Julius Nkosi on 11 December, 2013 - 12:03 pm
Control the level in a vessel while the other is transferring to the store tank, ensuring that only the desired is transferring while the other is being filled
New Replies:
Assuming you have a valve at each tank to select which one is delivering product put a position...
Topic: Sensor technologies.
from the Steam Instrumentation department...
Steam Flow Switch
Originally posted by Ben Janvier on 16 November, 2013 - 10:24 am
Need a steam flow switch for MP Extration
New Replies:
Since the reason for injecting water is to cool the steam down, temperature would seem to be an...
Topic: PLCs and related questions.
from the Forum department...
Remote Access Via Cell Network
Originally posted by Roy Matson on 22 March, 2012 - 5:41 am
How can I access a PLC network via cell?
New Replies:
I thought you guys would jump all over this one. I have since spoken with a cell modem supplier...
Topic: Continuous process industries, DCS questions.
from the Instrument department...
Pressure transmitter installation question
Originally posted by mahmoud on 22 March, 2012 - 5:49 am
PIT installation question
New Replies:
Condensate pots are usually only used on condensing vapours like steam. There is no need for a pot...
Topic: Sensor technologies.
from the automation department...
measurement of water level
Originally posted by paru on 23 March, 2012 - 6:16 am
Sudden drop in level ?
New Replies:
It sounds as though the pressure transmitter you are measuring the level with is connected to the...
Topic: Engineering and workplace issues.
from the No Power Source At the Tank department...
Wanted: Simple and Inexpensive Automated Pump Control System Solution
Originally posted by M Jensen on 4 January, 2012 - 9:10 pm
Looking 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.
New Replies:
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...
Topic: Sensor technologies.
from the Instrumentation department...
Level transmitter
Originally posted by Anand on 15 January, 2012 - 2:35 am
Explain the Working principle for Displacer type and Float type level transmitters.
New Replies:
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...
Topic: Continuous process industries, DCS questions.
from the I & E Department department...
Understanding Absolute Pressure
Originally posted by Matt on 17 January, 2012 - 9:01 am
Trying to figure out how to calibrate this absolute pressure transmitter.
New Replies:
There is no connection on the Low side because it's under vacuum, if you cracked that you would...
Topic: Sensor technologies.
from the Enginnering department...
Flow Transmitter calibration
Originally posted by A.Elshaer on 15 January, 2012 - 1:27 pm
Flow transmitter Recalibration on-line
New Replies:
You will need to tell us more about your meter before we could even take a guess....
Topic: Sensor technologies.
from the Forum department...
adjusting linearity
Originally posted by mohan on 8 December, 2011 - 4:54 pm
how to adjust the linearity error if provided
New Replies:
You didn't say linearity of what. For Bourdon tube pressure gauges and old style controllers...
Topic: PLCs and related questions.
from the 321123 this 1-3 input is bothering me! department...
1-3vdc analog input to 4-20ma
Originally posted by Bobby Gauthier on 8 November, 2011 - 2:30 pm
I need to know how to convert a 1-3vdc input to a 4-20ma. input
New Replies:
Forgive me if I double post A 125 Ohm resistor in series with a diode will give 1.1 to 3.1 Volts...
Topic: Software, including programming, OS issues, etc.
from the instrumentation,process control department...
Software to measure flow/velocity of overflow from weir
Originally posted by lalas on 10 May, 2011 - 4:07 pm
Software to measure flow/velocity overflow from a weir using a fixed camera
New Replies:
Why not just bite the bullet and buy one of the ultrasonic transmitters that are designed for just...
Topic: Engineering and workplace issues.
from the Forum department...
RTD Cable Specs
Originally posted by Dennis on 13 October, 2010 - 2:33 am
RTD Cable Specs
New Replies:
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. ...
Topic: Sensor technologies.
from the Department of Money Losing Jobs department...
Bouncing Current Loop
Originally posted by Bret Berger on 12 October, 2010 - 6:29 pm
1 mile long 4-20mA current loop bounces.
New Replies:
Brett, I think you might be on to something with the bouncing caused by current inrush when...
Topic: Sensor technologies.
from the Instrumentation department...
Rangeability of smart flow transmitter
Originally posted by Mantu on 15 January, 2009 - 3:41 am
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...
Topic: PLCs and related questions.
from the Forum department...
Flow Rate Totaliser
Originally posted by Yong on 9 January, 2009 - 1:10 am
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...
Topic: Engineering and workplace issues.
from the Forum department...
DCS controller configuration
Originally posted by Luis on 16 January, 2009 - 3:25 am
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...
Topic: Engineering and workplace issues.
from the Control Systems department...
Orifice Plates
Originally posted by Anand on 14 January, 2009 - 4:11 am
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...
Topic: PLCs and related questions.
from the Forum department...
PLC 4-20mA pin circuit
Originally posted by SK on 14 January, 2009 - 11:58 am
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...
Topic: Engineering and workplace issues.
from the Forum department...
PT in high temperature
Originally posted by Mike on 13 January, 2009 - 2:21 am
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...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Level switch for furnance oil application
Originally posted by Anonymous on 9 January, 2009 - 4:58 am
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...
Topic: Sensor technologies.
from the Forum department...
High temperature pH measurement
Originally posted by JermaineC on 12 January, 2009 - 1:55 pm
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...
Topic: Power generation equipment control.
from the Flow measurements department...
V-cone flow meter for large pipes
Originally posted by David Zobin on 7 January, 2009 - 4:19 pm
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,...
Topic: Engineering and workplace issues.
from the Forum department...
volt free contacts
Originally posted by pwild on 11 January, 2009 - 10:59 am
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"...
Topic: Continuous process industries, DCS questions.
from the Instrumentation & Control department...
Level Measurement in a power plant
Originally posted by SpaceMonkey on 7 January, 2009 - 1:32 am
Please suggest where exactly in a power plant are the following technologies used:
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...
Topic: Motion control, servos, steppers, etc.
from the Forum department...
Linear displacement sensor
Originally posted by Tim Wauters on 7 January, 2009 - 5:08 am
I need help finding an adequate sensor
New Replies:
Everyone needs help sometime. The most accurate instrument I know is a Magnetorestrictive sensor...
Topic: Application Questions and Problems
from the Instru department...
115VAC at 400 Hz
Originally posted by Ritika on 6 January, 2009 - 9:42 pm
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...
Originally posted by Singhbvirk on 18 December, 2008 - 8:15 am
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...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Decoupling control loops
Originally posted by Bill Dolan on 29 December, 2008 - 12:09 pm
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...
Topic: Engineering and workplace issues.
from the control system department...
Barriers & Isolators
Originally posted by Gowri Sankar M on 31 December, 2008 - 12:32 am
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...
Topic: Motion control, servos, steppers, etc.
from the Automation List department...
Help finding motor for actuator 12v
Originally posted by MIke on 5 July, 2003 - 10:25 am
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...
Originally posted by Grishma on 28 October, 2006 - 1:15 am
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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