from the control department...4 wire vs. 3 wire RTD
What is the difference between 4 wire RTD and 3 wire RTD?
By edie on 24 April, 2014 - 3:15 pm -
i have a question, some application, they connect RTD directly to control cabinet (without...
from the INSTRUMENTATION department...UREA FLOW METER
What type of flowmeter can be installed in a Urea duct as a source of FD and ID fan in the duct?
> What are you measuring? Just air flow? Thank you for your response. Sir, as it is a large...
By Billy on 15 April, 2014 - 10:30 pm -
What are you measuring? Just air flow? We use a DP transmitter for our prill tower air ducts....
from the Real puzzler department...Thermocouple readings problem
Took temperature readings with J thermometer but only had K type wire!
By d- on 23 April, 2014 - 4:46 pm -
what you have to be careful of is that Type-K thermocouple wire, and Type-K extension wire are two...
Another control.com thread http://control.com/thread/1336501913 involved back calculating when...
from the Instrumentation department...Calculating LRV/ URV of a Bubbler Level System
How do you calculate the LRV and URV of a Bubbler type Level Transmitter?
By Casualguy on 23 April, 2014 - 5:08 am -
first find the clearance of your dip tube. say if it is 200mm. total height of the tank =...
Your bubbler can not 'see' any head pressure lower than its elevation, so you can not measure any...
from the Forum department...Can I say my device is MODBUS-RTU compaible when.....
Could I say that with the following facts my device is MODUS-RTU compatible
By Steve Myres on 21 April, 2014 - 4:28 pm -
Agreed. Other than noting that you should be as flexible as possible on serial parameters (and...
By Lynn August Linse on 17 April, 2014 - 11:10 am -
Looks good to me, and the 'no parity' option *IS* important as some Modbus devices don't support...
from the Automation department...Hall/Magnetic Sensor
Hall Sensor Replacement Failed !
Thanks Geir. I have measured 13.5 VDC on Vcc line of the sensor from controller and same voltage on...
I can think of 4 common and several not so common output configurations for this type of sensors,...
from the instrument department...Dwyer flow switch information
dwyer obsoleted flow switch
from the inst department...Gulde control valves
Suppliers of GULDE control valves.
By Dipankar Biswas on 17 April, 2014 - 11:41 pm -
> Please let me know the suppliers of GULDE make control valves. We M/s Continental Valves...
from the Forum department...MODBUS Break Condition & Checksum
MODBUS RTU using RS485 to RS232 converter connected to RS232 to USB converter to communicate with electric meter using MODBUS Poll.
By Lynn August Linse on 17 April, 2014 - 10:53 am -
Having the RS-485 +/- reverse (or swapped) will usually look like a BREAK condition if blindly...
By Steve Myres on 16 April, 2014 - 1:04 pm -
Maybe try a different converter (or your current setup with another slave). FTDI sells some that...
from the Instrumentation & Control department...Liquid gas level measurement
Liquid Gas Level measurement
By Sam on 17 April, 2014 - 3:45 am -
The instrument to use in a application like this is a DP with capillaries and chemical seals with...
from the measurments department...Standard for temperature measurement
Location of temperature measurements (problems)
from the Forum department...Instrumentation cables sizing
Instrumentation cables sizing
By Franco Kew on 16 April, 2014 - 6:03 am -
Dear Ahmed Sami, Your question is incomplete I can say. Cable cross section and hazardous area...
Ahmed Sami, Choosing wire/cable for a particular application is a very involved process. Does...
Why do you sugget 1.5 mm2 cable? Does that follow any standards recommendation or calculations? ...
You Need at least 6x1.5mm (6 core cable)...
By rvsaradhi on 11 April, 2014 - 2:21 pm -
please note that for all your instrument devices you can use 3x1.5sqmm (3 core cable)....
from the Level Control department...Magnetorestrictive Level Transmitter issues
Extreme vibration and loss of signal on level transmitters
By Sam on 15 April, 2014 - 8:12 am -
Hi Mateus, there is only one instrument when you are working offshore on a FPSO or Platform...
from the Thermocouple department...Thermocouple cable configuration
Choosing thermocouple cable configuration- twisted pair or coaxial (multi cored)
By rvsaradhi on 14 April, 2014 - 11:59 am -
please note that T/C TYPE N lower cost compensated can be used depends up on your critical...
By W.L. Mostia on 14 April, 2014 - 11:42 am -
It is seldom ever a good idea to run un-twisted pair thermocouple extension wire. Thermocouple...
Shrk, www.omega.com is a very good resource for all kinds of sensors, particularly RTDs and...
By Shrk on 14 April, 2014 - 4:53 am -
Hi. Thanks. tried looking, did not get much info. Will certainly try again. Again, thanks...
You need to use thermocouple extension wire and thermocouple terminal blocks, having the same...
from the Forum department...8-bit data types in Modbus registers
Are 8-bit data types obsolete for Modbus?
By Lynn August Linse on 14 April, 2014 - 10:39 am -
A bit of historical trivia... Modbus never had 8-bit data types. The original PLC were made back in...
> Since registers are always 16 bits, does it even make sense to provide data types of 8 bits...
from the Forum department...Actuator indication and control
How to obtain indication and control from a Rotork actuator
Other types of actuators use two drive signals: - one signal drives the actuator 'open' - the...
By rvsaradhi on 11 April, 2014 - 2:17 pm -
please provide actuator model number and application...
from the Forum department...Condensate pots and flow measurement
Using condensate pots for flow measurements
1. The purpose of condensate pots in steam flow measurement is to isolate or seal the transmitter...
from the maintenance department...Process Switches NO NC definition
What "normally" means in process switches.
By N.A. on 11 April, 2014 - 1:51 am -
Dear Sir, Normally means then initial condition of any switch or relay without pressing or...
from the Forum department...Flow Rate Calculations S7-1200
Flow Rate Calculations S7-1200
from the Investors department...New Flow Measurement Method
How to find an investor of instruments.
Abdolazim Hasseli... first get a reliable Patent Attorney! Do Not, repeat,...
from the Forum department...2oo3D voting
Explain if 1oo2D voting is just similar to 2oo3 voting for ESD system.
Let's start with your requirement of tripping of valve on rise of line pressure beyond high limit....
from the Density Measurement department...Coriolis density measurement
Student project in coriolis density measurement.
By Walt Boyes on 7 April, 2014 - 12:16 pm -
If you can get it to flow, you can pump it through a Coriolis Mass Flow meter. This is the kind of...
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