Interested to Buy Any Domain ? << Click Here >> for more details...
Furnace draft transmitter range is -50 to +50 mmwc. why the
impulse line connected in hp side?
- 2 Answers
- 13822 Views
- Arena, I also Faced
- E-Mail Answers
Answer Posted / carl_ellis
A draft range measurement is typically a gauge pressure
measurement, referenced to atmosphere.
Draft range is very, very low pressure, so DP transmitters
are typically used because they're readily available in
a 'draft' range with the large diaphragms necessary for low
pressure measurements.
The high side is connected to the process with an impulse
tube. The low side is exposed to atmospheric pressure.
Good practice puts a filter, like a scintered pneumatics
filter on the low side, so that dirt doesn't fill the low
side cavity and air movement (wind, passing vehicles) is
buffered and damped to prevent the forces of air movement
on the low side from affecting the draft measurement.
If the impulse line were connected to the low side, the DP
would be negative, a DP subtracts the low side pressure
from the high side pressure (atmosphere minus some positive
pressure = negative pressure). Convention says that draft
range is positive so the impulse connection is to the high
side, to get a positive value.
Tell 'em Carl sent you.
| Is This Answer Correct ? | 12 Yes | 1 No |
Post New Answer View All Answers
Specific gravity.
how pressure transmitter work, what is its principal to measure and how its generate signal. for pressure transmitterinstallation which precautions must be taken ??
how u calibrate pneumatic n motorized c/v?
What are the types of valves?
applications of plc in printing and packaging?
i hav applied for the post of engg. in iocl so please require the past test papers fro instrumentation engg please please help me and send me the papers or tell me the pattern and type of ques asked in examination......
What is the Working principle of Dozing valve?
How do you identify between actual alarm and false alarm in a Temperature Transmitter in SCADA based Control System
Somebody can explain me about >Critical Loops, calibrations, ESD critical Loop checks, Logic Diagram / Cause & Effect checks for ESD loops,
principle of dead weight tester ?
In control valve proximity inductive sensor is taken as digital feedback for full open and full close.Normally its volts 24v when the sensor acts the feed back voltage 14v so that our relay not indicating in plc panel . kindly give the solution.
what is orfics working in main steam line. is it increase pressure, velocity of steam flow and dicrease steam flow rate. or any other
Definition of reverse and acting controllers:
In turbine, what does term CDP, NI, NH, HSSOC, means
PT RTD Range: -200 to 500 degree celsius If I configured in DCS Lower range and Upper range . In face plate it shows red colour due to overa range how was the characteristics look If the temperature is more than operating range. how was the characteristics look . whether its in Resistance vs Temperature curve is Linear or Non linear
