Interested to Buy Any Domain ? << Click Here >> for more details...
is here anybody who knows how to calibrate the pressure
transmitter? ONLINE
- 5 Answers
- 11337 Views
- I also Faced
- E-Mail Answers
Answer Posted / sam
This procedure can be used to calibrate any type of
instrument in the field on a live plant regardless of it's
type or application. The only variation in the procedure is
what test equipment you will use to calibrate the instrument
with. For instance calibrating a temperature transmitter you
want to take a HART and decade box with you. Calibrating a
pressure , flow or DP transmitter, you want to take a HART
and pressure pump with you like a Druck or hand pump with a
precision gauge on.
The procedure:
Since the transmitter is on line and on a running plant, you
need to determine a couple of things first before you start
working on it. First and most important of all, what does it
do? Is it a control transmitter, a trip transmitter or just
a indication.
Control transmitter means it's output will go to the DCS and
is linked to a PID controller which will give a continues
output, based on this input, to a control element in the
plant plant like a control valve or a heater element. These
are all critical control components that will trip the plant
if you upset their stability.
Trip transmitter means that it is linked to the ESD system
and will start a plant shut down if it is seeing a to high
or low pressure, flow, DP or level depending on the
application you are working on. Just indication means that
it is completely safe to work on and you cannot trip anything.
To make the control transmitter safe to work on you need to
put the DCS PID controller in manual. This will keep the
output of the controller at the current output position and
bypass the output function of the controller. In a fast
moving application the control room operator will send a
field operator with you to control the control valve
manually with it's hand wheel while you work on the control
transmitter.
To make the trip transmitter safe to work on you need to put
a inhibit in the ESD system output trip function of the
transmitter. This is also sometimes refer to as a MOS
(maintenance override switch).
In both cases the control room operators will do this for
you providing that you have all the permit to work and
inhibit permission paperwork in place.
Good luck
| Is This Answer Correct ? | 17 Yes | 0 No |
Post New Answer View All Answers
What is loop1 and loop2 in MTS LT?
What are de-saturators?
what is intrinscily safe system and where we use?
What is first echo & echo window in radar type level transmitter?
In VVVF DRIVES VOLTAGE IS ALSO VARY WITH THE FREQUENCY. HOW? WHAT IS THE DIRECT FORMULA RELATING THESE TWO.
what is metal of piston ring
hi i am eswar i want to know the instrumentation interview questations for eil(engineers india ltd) i have applied for engineer post in eil please help in this.my mail id eswar310@gmail.com
Why upper weighing limit of electronics balance is 90% of the total weighing capacity?
hye SAM acn u send your e mail id, so that i can solve my query through e mail?
What is the purpose of the analyzer in petrochemical plant?
How to calibrate radar type level transmitter for interface level? Total liquid(liq.1 and liq.2), level both the liq individually? For. Both the liquid levels how the signal will go from transmitter to dcs? How to calibrate. Single radar 9:26:55 AM for 2 different liquids in a tank?
What is Cavitation in a control valve?
what is the difference between scaler and vector drive
what is the working principal of pribe
please send the sample qustion paper for iocl written test ..
