Answer / visakh ctjv

In ultrasonic level transmitter, a ultrasonic source is
used to produce ultrasonic pulses . these pulses are
transmitted through the vessel,the echo returning back
from the vessel is then recieved by a detector , depending
upon the level in the vessel the frequency of the recieved
signal varries ,the difference between the transmitted
pulse frequency and the recieved signal frequency is used
to measure the level.

Answer / hassanelect

The ideal mounting point for the sensor is directly
underneath the silo roof.
The ultrasonic emitter in the sensor is excited electrically
and sends an ultrasonic pulse in the direction of the
surface of the product. The surface partially reflects the
pulse. This echo is detected by the same sensor, now acting
as a directional microphone, and converted back into an
electrical signal.
The time between transmission and reception of the pulse -
the sonic run time - is directly proportional to the
distance between the sensor and the product surface.
The distance D is determined from the velocity of sound c
and the run time t by the formula:
D=C.t/2

Answer / naabil al-eryani

The transmitter is designed to be mounted above a liquid
and uses ultrasonic pulses to continuously measure the
distance to the liquid surface.
The microprocessor-controlled electronics calculates
distance to the liquid level from the time delay between
the transmitting and receiving of signals.

WHAT IS INSTRUMENTATION?

17 Answers   ITC Infotech,

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Can please tell mi about SIOS, PRM, SERVER, and what is the diference between PIN LAN, PCS LAN,APC Server, and please send the Doc if possible for referance,mail id patil_amit17@yahoo.com

0 Answers  

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In split range control, we will control 2 outputs with time interval. Eg :(with 4-20 ma signal, for 4-12 ma we are operating one control instrument like valve & for 12-20ma we are operating other control instrumet (other valve). If we get a signal of 15ma to first instrument (Valve 1), what will happened to the first valve, and if we get signal above 20 ma to 2 valve what will happened ?

3 Answers  

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what is Micro-switch and where it is used......?

7 Answers  

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what is plc communication?

2 Answers   Siemens,

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when an eddy current probe is installed inside of a turbine or compressor in case of probe problem same as:crash of head of probe,changing the scale factor because of low measuring gap(physical gap is ok(example=1.14mm)but voltage is reduced(example=-6 volts),is any way to check the probe,when the ohm of probe is ok.thank you,(Karim Tavakoli)

1 Answers  

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kindly sent some demo question and answer

0 Answers   HPCL,

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How we will check whether the proximity, which we have is either NPN or PNP, if no data sheet or manual or any details is available to us ???

1 Answers  

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What is a flow meter?

2 Answers  

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can we copy the software from a transmitter using hht(hart 275) ?

0 Answers  

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why we are using 4-20ma why cant we use 4-40ma

3 Answers  

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what are the steps to follow force a particular input or out put from ics triplex esd system?

1 Answers  

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