how to calibrate bubbler type level transmitter of
rosemount make and how to set air flow according to the
range.. give one calibration procedure with one example
A bubbler system uses a pneumatic differential relay as a constant flow regulator. Most bubbler systems include a variable area flowmeter, a rotameter, to indicate the air/gas flow rate and a needle valve for adjusting the flowrate.
Typical air/gas flowrates for bubblers are 8-30 cc/s (1 to 4 SCFH), a flow rate suitable to create a constant stream of bubbles from the dip tube.
The only 'calibration' of the pressure transmitter in a bubbler system is setting the range of the transmitter's 4-20mA output with a zero-to-span range that takes into account the maximum liquid column head pressure that the transmitter will 'see', which takes into account the specific gravity of the liquid.
Conversion to physical level units (accounting for specific gravity) is done in the receiver (indicator/PLC/DCS/PAC/controller).
|Is This Answer Correct ?||3 Yes||2 No|
what are the use of belew gear in general ??
please send me some question papers of HPCL aptitude test ?? please send it to firstname.lastname@example.org ...
how to calibrate differential pressure switch
What are the different types of temperature sensors and the principle they work on?
what is the difference between RS 232,RS 485,RS 422, how they different from each other
How to check electrical health of Vibration probe?
which flow meter is use for measuring the open channel flow?
How can we loop powered for a transmitter.How we can do wiring
why full bore ball valve is not used in steam applications?
How many interlocks at turbine side?
Paper Details: company -- Hindustan Copper Limited post -- GET 2008 Date -- 03.08.2008 Dept.-- Electronics?Instrumentation Aptitude -- 70 Technical-- 80 Total Time -- 2hr 30min I have listed the question I could able to remember 1. BCD equivalent of 43 2. value of K for stability of a system from a given equation 3. transformer connection for darlington connection 4. damping of balastic galvanometer 5. advantage of chart-pen recorder over CRo 6. CRO - how to change bandwidth 7. questions on CRO construction 8. reverse saturation current of si diode 9. advantage of wire wound resistance over carbon resistance 10. core material for a small coil 11. max fanout-- TTL/ECL/CMOS/MOS 12. component of resistance of monolithic IC 13. functions of capacitors in multivibrators 14. to change a sawtooth signal into a square wave we use-- schmit trigger/ schottkey diode/ zener diode 15. relation b/w á & â in transistor ckt 16. function of SiO2 layer in fabrication 17. 3 questions on ODD MAN OUT
Identification of control valve parts.