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Control.com member...
Member Information and Posts by David_2
Originally posted by RLovell on 29 August, 2014 - 1:08 pm
My high school students ask when/how/if abstract topics like polynomials, factoring, rational functions are ever actually used in the Real World. I don't know..maybe you do?
New Replies:
shortened URLs for the thermocouple polynomials above Thermocouple polynomials ...
Topic: Continuous process industries, DCS questions.
from the Instrumentation and Control department...
Calculating Pressure Transmitter Range
Originally posted by Kamaraj on 21 August, 2014 - 7:42 am
How can we test Rangeability of Pressure Transmitter?
New Replies:
The word 'Turndown' is used in two ways. One use of the word turndown is to define how far a...
The term in "FSO" in your spec means (percent) of full scale uncertainty. My selection...
A colleague informed me that an NaK transmitter is a pressure transmitter with a local fill fluid...
The definition you found is a correct definition of rangeability. I have no idea what a NaK...
Topic: Local and wide area networking in factory automation.
from the Forum department...
MODBUS to Lan Convertor
Originally posted by danaqu on 26 August, 2014 - 2:53 pm
Looking for a MODBUS to Lan convertor.
New Replies:
It might work. I didn't see any software for configuring it. That type of serial server is...
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 think Roy got it - manual station. I thought almost any PID controller had an auto/manual or...
Topic: Engineering and workplace issues.
from the Forum department...
Equation for Flow conversion in DCS
Originally posted by Aravazhi on 8 August, 2014 - 3:55 am
Need help calculating the DP flow in m3/hr. Have most of the equation.
New Replies:
When you say that 0-500 mbar = 0-20,000 Kg/hr, was that calculation done using the same medium...
Originally posted by Jeff Julian on 8 August, 2014 - 8:38 am
Is there a way of upgrading our HC900 C50 Version 1.0x to a higher version to take advantage of its features w/o changing the cpu?
New Replies:
1) HCD (Hybrid Control Designer) software is backwards compatible to V1.0 controller firmware, with...
Topic: Sensor technologies.
from the Voltage drop department...
Honeywell XNX voltage drop
Originally posted by Saurabh on 7 August, 2014 - 7:52 am
Honeywell XNX shows voltage drop after connecting the TX
New Replies:
Your power supply and wiring are not providing the minimum voltage to the XNX (a gas detector). ...
Topic: Application Questions and Problems
from the Engineering department...
Looking for mA to Ohm Converter
Originally posted by Abhi on 5 August, 2014 - 4:22 am
Looking for a device that can convert 4-20 mADC or 0-10 VDC to 1~5 KOhms.
New Replies:
I know of no commercial device that does what you describe. Beamex manufactures process...
Topic: Local and wide area networking in factory automation.
from the The Banging Head Against Wall Department department...
RS485 Issues - Modbus Temperature Controller to Ethernet
Originally posted by Plutonius on 1 August, 2014 - 9:08 pm
I am currently have a bit of an issue connecting to a Love 2600 temperature controller via RS485 full duplex with a Grid Connect NET485 Modbus RTU to TCP ethernet bridge.
New Replies:
Are both Love and the RTU side of the bridge 4 wire, full duplex? If one side is 2 wire half duplex...
Topic: Motion control, servos, steppers, etc.
from the Forum department...
Field-bus Actuator Recommendation
Originally posted by Carlos Loureiro on 14 July, 2014 - 10:07 am
Looking for recommendations for a Field-bus Actuator
New Replies:
You need a positioner with Fieldbus communications, not an actuator. The actuator does the...
Topic: Software, including programming, OS issues, etc.
from the Electrical & Instrumentation department...
Unable to load DTM of HART Field Transmitter
Originally posted by Hoa on 24 March, 2014 - 11:02 pm
The Preventive Maintenance Server can not access Rosemount HART protocol transmitters
New Replies:
Rosemount download site for DTMs for Rosemount instruments. http://tinyurl.com/qe6cfy8...
Topic: Continuous process industries, DCS questions.
from the Instrumentation department...
DP to Flow conversion
Originally posted by kamaraj on 4 July, 2014 - 6:13 am
can we directly configure square rooted DP (4 - 20mA) from DP transmitter to flow
New Replies:
> And the max range of orifice is 120 m3/hr if my DP is 20mA then is my flow equals to...
Every 3051 has a parameter to convert the output of configured DP range from a linear DP output to...
Originally posted by Joe on 29 June, 2014 - 7:10 am
Differential pressure as tank level incorrect reading
New Replies:
I haven't a clue what your supplier actually provided. You need to ask them to be very specific...
Presumably this is liquid CO2 in a pressurized vessel? You probably have the wrong DP pressure...
Topic: Communications systems and equipment.
from the Forum department...
RS-485 Communications
Originally posted by Bill Dolan on 24 June, 2014 - 1:47 pm
RS-485 Communications with Standing Waves
New Replies:
Agreed, Curt does give great explanations. Oscilloscope for RS-485 differential signals - need...
In a word, yes. For a graphic illustration of such, look here: http://tinyurl.com/o6mbtwm ...
Topic: Communications systems and equipment.
from the Forum department...
EGD Protocol?
Originally posted by RonG on 17 June, 2014 - 11:45 am
Looking for EGD protocol spec
New Replies:
90 page note on EGD protocol: http://tinyurl.com/ouhg4rs...
Originally posted by Tulus Lubis on 5 June, 2014 - 1:01 am
Standard installation for Gas Flow Measuring with Pressure and Temperature compensation.
New Replies:
I just thought locating the PT static pressure tap at the high side DP tap and keeping a thermowell...
Thermowells are downstream of the orifice beyond the meter run length. Before multivariables...
Topic: Continuous process industries, DCS questions.
from the Maintenance department...
Endress+Hauser Level Transmitter Hunting
Originally posted by Talluri on 21 May, 2014 - 2:59 am
What is the possible cause for Level transmitter hunting?
New Replies:
Most all modern level instruments can be configured to indicate a high or a low level (or sometimes...
No one here can see your installation. We only know what you tell us, which thus far, is...
Topic: Engineering and workplace issues.
from the Forum department...
Control Valve Positioner
Originally posted by Gagandeep Singh on 10 June, 2014 - 5:51 am
Inlet air pressure of smart positioner is varying
New Replies:
The Azbil SVP3000 'smart' positioner is a HART 4-20mA current pneumatic valve positioner. The...
The inlet air is has a mechanical pressure regulator somewhere upstream. The changes in pressure...
Posted by David on 5 June, 2014 - 10:41 pm
ASCII, RTU, TCP, now ABB?
Topic: Continuous process industries, DCS questions.
from the INSTRUMENTATION department...
Differential Pressure Transmitter Calibration
Originally posted by RAMESH on 31 May, 2014 - 5:43 am
Changing the range of Differential Pressure Transmitter Calibration.
New Replies:
Tables A-1 and A-2 on pages 118-119 of the 3051 manual shows the LRL and URL range 'limits' (not...
Topic: Communications systems and equipment.
from the modbus rtu department...
rs 485 deep sea 7320
Originally posted by luis carlos sandoval on 30 May, 2014 - 8:22 pm
modbus rtu slave rs485
New Replies:
whoops, it's late. Correction to my previous post: 0406h is 1030 decimal. The one offset...
The DSE-7300 operator manual shows setting the Modbus slave address and the baud rate on page 70...
Topic: Software, including programming, OS issues, etc.
from the Forum department...
Instrument Tech Training Topics
Originally posted by GBrown on 29 May, 2014 - 4:50 pm
My boss has asked me to create a training program from the instrument techs that is one 3 hour course a month for 2 years.
New Replies:
Providing a list of suggested topics to your intended audience is a great technique to spur a...
Topic: Communications systems and equipment.
from the Forum department...
EDDL files stored in/on device?
Originally posted by Paul Tinetti on 29 May, 2014 - 4:48 pm
Why haven't manufacturers figured out a way to store EDDL files in on-board memory of devices?
New Replies:
Isn't the EDDL the 1-2Mb file, a DTM or DD file, that defines the objects in a specific model that...
Topic: Computers in manufacturing; also hardware discussion.
from the Forum department...
Foundation Fieldbus - Linearization Type
Originally posted by Derrick on 25 May, 2014 - 9:17 pm
Foundation Fieldbus Linearization Type
New Replies:
No, when the transducer's direct range (-1 to 2 bar) differs from the reported range (-1 to 1 bar),...
Borrowed from Anderson Instrument's FF transmitter manual (my comments in parentheses) Direct:...
Topic: Sensor technologies.
from the Forum department...
Vortex Flow Meter
Originally posted by Prasana on 14 May, 2014 - 4:29 pm
Troubleshooting Vortex Flow Transmitter
New Replies:
Inlet pressure to the valve changes. With the controller in manual mode holding the valve at a...
Topic: Continuous process industries, DCS questions.
from the Forum department...
pulse scale factor
Originally posted by Hoo on 8 May, 2014 - 3:41 am
pulse scale factor
New Replies:
It appears that the repeatability of a given coriolis flow meter increased from 0.05140% to...
Topic: Continuous process industries, DCS questions.
from the Automation List department...
Electromagnetic flow meter problems
Originally posted by karthick on 12 May, 2014 - 3:47 am
Totalizer reading on electromagnetic flow meter of chemtrols errors.
New Replies:
Most, if not all, flow meters have a setting called something like "Low flow cutoff". ...
Topic: Sensor technologies.
from the Forum department...
Measuring Flow with Annubar
Originally posted by hknclk on 11 May, 2014 - 9:36 am
Should pipeline be full of water for measuring flow with annubar?
New Replies:
To get a flow reading that is meaningful, the pipe needs to be full of liquid. The requirement...
Topic: Local and wide area networking in factory automation.
from the AKH department...
4-20 ma HART Transmitter
Originally posted by gct on 7 May, 2014 - 4:10 pm
HART transmitter showing only 4 ma or 3.9 ma but it should show 12 ma as per process variable indicated in HART communicator.
New Replies:
Without knowing what the function of terminals 1, 2, 3 and 4 are, it's not possible to determine...
Topic: Engineering and workplace issues.
from the Thermocouple department...
Thermocouple extension wire resistance
Originally posted by Farzin on 7 May, 2014 - 10:39 am
Thermocouple extension wire resistance
New Replies:
Not surprising, different alloys have different resistances. There are tables with resistance...
Topic: PLCs and related questions.
from the Forum department...
Multiple Controllers on one RTD
Originally posted by FredS on 7 May, 2014 - 8:19 am
How can I use the same RTD for more than one controller?
New Replies:
See the blog on this topic at the link below: http://tinyurl.com/mtaqm6f > Can I connect a...
Originally posted by rajesh patil on 23 April, 2014 - 2:28 pm
why the modbus mapping register is visible at register address +/- 1 address.
New Replies:
Guys who live in cubes write the code. Hence, it depends on whether the guy who wrote the code...
Topic: Sensor technologies.
from the Real puzzler department...
Thermocouple readings problem
Originally posted by Michelle on 22 April, 2014 - 10:22 pm
Took temperature readings with J thermometer but only had K type wire!
New Replies:
Another control.com thread http://control.com/thread/1336501913 involved back calculating when...
Topic: Sensor technologies.
from the Instrumentation department...
Calculating LRV/ URV of a Bubbler Level System
Originally posted by Kazim on 22 April, 2014 - 12:56 am
How do you calculate the LRV and URV of a Bubbler type Level Transmitter?
New Replies:
Your bubbler can not 'see' any head pressure lower than its elevation, so you can not measure any...
Topic: Communications systems and equipment.
from the Forum department...
Modbus via microcontroller
Originally posted by Ed on 20 April, 2014 - 2:40 am
Communicating with device via Modbus RTU through a microcontroller.
New Replies:
If it were me, I'd connect a PC with a serial port running a generic Windows Modbus 'test' master,...
Topic: Continuous process industries, DCS questions.
from the instrumentation department...
I/P positioner and I/p transducer Control valve
Originally posted by Emerson process management on 13 May, 2012 - 4:18 am
Difference between I/P positioner and I/p transducer
New Replies:
Look at the principle of operation and internal diagrams of a Bellofram Type 1000 I/P. It does not...
Topic: Communications systems and equipment.
from the Instrumentation and Control department...
Communication between Speedac NXT weighing Controller and Honeywell Scada
Originally posted by RKM on 17 April, 2014 - 3:15 pm
Speedac NXT controller is not communicating with Honeywell Server via RS 485 serial communication.
New Replies:
Was the former device communicating properly right up until it was replaced or is the replacement...
Topic: Communications systems and equipment.
from the Automation and EMS department...
Modbus Data transmission time
Originally posted by Bhadresh Sarvaiya on 12 April, 2014 - 7:58 am
How to calculate time to receive data from slave to master in daisy chain connection of slaves, if my slaves are 20 and single master.
New Replies:
Mr. Linse, What's a rule-of-thumb value for RTU-TCP latency in a Digi Modbus bridge product? ...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Actuator indication and control
Originally posted by David Sutcliffe on 11 April, 2014 - 10:32 am
How to obtain indication and control from a Rotork actuator
New Replies:
Other types of actuators use two drive signals: - one signal drives the actuator 'open' - the...
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