HART multi drop to multiple 4-20mA loops
Exd Approved Flow-Controller
Looking for an ExD approved gas flow and pressure controller. The component(s) need to be compact to fit in a box with the following dimensions: Height: 550mm by With: 300mm by Thickness: 150mm.
By Roy Matson on 31 January, 2015 - 7:37 am
Brooks thermal mass flow controller is one I have used. it both measures and controls in a single...
Help needed with a question on process control networks for a interview.
Why Need 250 ohms resistor in HART protocol
Need of 250 ohms resistor in HART protocol
By Mujahid Chougle on 29 January, 2015 - 10:17 pm
> Why do we need to include 250 ohms resistor in the loop while using HART protocol? -...
Electromagnetic flow meter problems
Posted by karthick on 12 May, 2014 - 3:47 am
Totalizer reading on electromagnetic flow meter of chemtrols errors.
Analog and Digital Signal Separation
Analog and digital field cable segregation in marshaling cabinet
Orifice Plate straight run requirements
Orifice Plate- straight run requirements w.r.t beta ratio
By Ari EP on 27 January, 2015 - 12:26 pm
Dear Roy and all, We are arguing the two different matters of orifice, i.e. flow orifice (where...
Specs for the Mark V ribbon cables
State Space Representation Does Not Work with Superposition Theorem
I need to get the state space model of a MISO circuit. I got the total differential equation from the superposition theorem but its state space model does not work.
Lossy NC Contact Blocks on Pushbuttons
Should I replace Estop buttons that are not reading 0 ohms Normally Closed?
By rootboy on 23 January, 2015 - 3:11 am
Have an assistant jumper across the contacts while you are measuring voltage at the coil. If you...
Selecting A Pressure Switch for Hazardous Environments
Need some help selecting the right pressure switch in an environment with H2S present.
By otised on 23 January, 2015 - 10:42 am
The main issue with H2S is its corrosiveness. It will destroy copper and many other metals. Gold...
By Bob Peterson on 22 January, 2015 - 1:55 pm
you would need to select a switch listed for use in the area classification it will be installed...
Peristaltic Pump on Industrial Bus
Controlling pump speed and receiving speed feedback from peristaltic pump on industrial bus
PCMCIA Card in Magelis panel
I could not work on PCMCIA PC card ATA by my laptop because in MY Computer i have icon for removable disk f: but i was not able to open it then I want driver program for this card then i can loading or copy my application file in it .
By Brian Cervi on 22 January, 2015 - 7:25 pm
If you are using Vijeo Designer, one of the "transfer options" is file system (others are...
By Hrushikesh on 21 January, 2015 - 12:21 am
I am also having problem with Memory card. We do not have File with .dop extension in the backup....
Valve Couplers FD0-VC-Ex4.FF
Posted by Stephen Haruna on 21 January, 2015 - 7:18 am
We intend to integrate an MOV (TEC2000) via DeltaV Explorer with a Foundation Fieldbus FF-H1 card and a Pepperl-fuchs Valve Coupler FD0-VC-Ex4.FF
By Steohen Haruna on 22 January, 2015 - 8:36 am
well, the FF positioners can be wired to/from the valve coupler using the 2:1 procedure and also...
Reading a Thermocouple with a Partlow MIC 6000 Process Controller
Can't get a a Partlow MIC 6000 Process Controller to read a K-type thermocouple correctly.
By rob on 9 January, 2015 - 9:12 pm
ah you engineer types are so practical! i fixed my shattered iPhone screen by myself and developed...
By rmac on 9 January, 2015 - 10:34 am
Thanks David, I found a place here in Boulder that will look at it but not without a schematic....
Optimal Control to Eeduce CO2 Emission
Looking for some guidance in designing an optimal control
I/O Mapping of Sub-Control System
What is I/O Mapping? Is it same as Interfacing Description of instrument?
K Value in Flow Measurement DP type
In Flow transmitter Calculation Procedure How is Constant K Value Extracted?
Sudden Variation in Value of Mass Flowmeter
Process value of Emerson mass flowmeter has suddenly increased. Flow is from 3100kg/hr to 3800 and density is double.
Restriction Orifice Thickness Calculation/Formula and Source Standard
Looking for "Flow Measurement Handbook" by Miller for formula to calculate restriction orifice Thickness .
By d on 17 January, 2015 - 12:03 pm
All stress calcualtions should be done by a qualified mechanical engineer, it is simple enough. One...
basic differences between contactor and relay?
By pvbrowser on 16 January, 2015 - 4:03 am
> The distinction of ... > Contactors often have auxiliary contact sets suitable for much...
Control Valve Calibration
Samson Control Valve 4763 calibration help
By Roy Matson on 14 January, 2015 - 4:41 pm
I think you are misunderstanding what process control is all about, there is no direct connection...
Flowmeter for Compressed Air
What is the best flowmeter for Compressed Air ?
By Roy Matson on 14 January, 2015 - 5:16 pm
Thermal mass can be quite troublesome if there is any entrained moisture because a tiny drop of...
By nayan mishra on 14 January, 2015 - 12:54 am
Hi, I have seen lot of compressed air application where turbine flowmeter with pressure &...
Coriolis Mass Flowmeter Does Not Stop Counting.
Promass 80 Endress + Hausser keeps measuring mass flow with closed valves.
New Control Method: Reactive Logic
Ordinary logic and computers are static, moving from frame to frame. Reactive Logic is dynamic, an alternative to computation that is faster, simpler, and safer.
By d on 6 January, 2015 - 8:16 am
True enough on all counts, but now you have to quantify what constitutes real-time...even with...
Water Distribution Pressure and Flow Control
What is the best approach to control a VFD pump speed in order to keep both a minimum pressure and a minimum flow in the distribution loop?
Using Internal Model Control Strategy
This query relates to a problem I am facing when designing an IMC based controller. I would really appreciate any help I can get.
By Yasushi Baba on 9 January, 2015 - 3:13 am
Try this; P = -0.06 I = 16 D = 2.5 Note that I am using ISA standard PID format. I used my...
Level Control for Water Tank
What kind of level sensors to be used to control the water level in a tank provided there will be level sensors to monitor 3 specific points in the tank.
Measuring Density And Viscosity
By Stuart Law on 5 January, 2015 - 10:35 am
I am looking for an application that will accurately measure Density & Viscosity and, if...
RTD Error during process.
By d on 4 January, 2015 - 2:57 pm
Open failure of of wire RTDs are the most likely, but they can fail in several ways that your...