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.

Why 1-5 vdc a standard?

1 Answers   Process Control Technologies,

---

Transmitter reading is zero but in DCS showing one Bar what is the reason ?

3 Answers  

---

What are the error values can accepted in flow transmitter calibration?could u give any formula for this?

0 Answers   Hamsco,

---

how to test rotor &stator earth fault in turbine

1 Answers   Bhel,

---

why we connect digital multimeter in series for dc current measurement and parallel for dc voltage measurement.

4 Answers  

---

Single acting ON-OFF valve. it is air to open. when sov energized , valve will be open, so during that if air fail then what will be the condition of valve ( open or close ) ???

4 Answers  

---

What is pressure,What is temperature,What is flow,What is level

4 Answers   Keltech, Petrofac,

---

How to calibrate DP transmitter by using HART communicator ?

1 Answers  

---

WHAT REASEAN USE TRANSMETER TWO WIRE & FOUR WIRE

5 Answers   Kentz,

---

What is loop or pigtail in an impulse line?

8 Answers   Qatar Airlines, Qatar Petroleums,

---

Which softwere is required to communicate the S7-300 processor

4 Answers  

---

(1) In turbine, what does term CDP, NI, NH, HSSOC, means. (2) What is the purpose of LO overhead tank in turbines.(3) An equipment is certified for EEX, IA, IIC,T6, what do you under stand by this.(4) what is SURGE, and how it is prevented, what is the purpose of bypass valve across AS valve.(5) Give 2 application of quartz crystal used for process parameter measurement.(6) what is meant by cold float of compressor shaft. (7) state four different types of flow measurement. For gas flow measurement mmscfd is the common unit. Expand the unit and specify significance of word S in the unit.(8) what is meant by Gap voltage, in vibration measurement. Normally how much Gap voltage is set and state the reason.(9) what will the new flow factor if D/P transmitter is Re-Ranged from 25” wc to 50” wc.(10) what is the usage of QDV & Volume booster.

0 Answers   ADMA OPCO,

---