Answer / vino

Devices such as ultrasonic flow equipment use the Doppler frequency shift of ultrasonic signals
reflected from discontinuities in the fluid stream to obtain flow measurements. These
discontinuities can be suspended solids, bubbles, or interfaces generated by turbulent eddies in
the flow stream. The sensor is mounted on the outside of the pipe, and an ultrasonic beam from
a piezoelectric crystal is transmitted through the pipe wall into the fluid at an angle to the flow
stream. Signals reflected off flow disturbances are detected by a second piezoelectric crystal
located in the same sensor. Transmitted and reflected signals are compared in an electrical
circuit, and the corresponding frequency shift is proportional to the flow velocity.

what is difference between hart signal and analog signal (4 to 20 ma)

2 Answers   Takreer,

---

how can we caliberate interface level troll

2 Answers   Grasim, IOCL, KOC, Sankyu,

---

i have been asked by QAFCO to appear for interview for thy post of Instrument Designer(INTOOLS)..i m engineering graduate with 5 years exp. in design engineering.Will this job profile suit me??i need all ur help n suggestions for thy same?

0 Answers   QAFCO,

---

What is critcal speed. what is resonant frequency. why we want to cross crtcal speed on higher RPM (early).

0 Answers  

---

WHY THE DEGREE OF VALVE PLUG AND VALVE SEAT IS SLIGTLY DIFFERENT I CONTROL VALVE TRIM DESIGN

0 Answers  

---

What do you do as a Engineering person EPC for Sizing&Selecting Control Valve?

1 Answers  

---

WHAT IS MEANT BY SUPERVISORY CONTROL?

3 Answers  

---

Is Hart communicator calibration device or communicating device for transmitter?

4 Answers   Yokogawa,

---

why vortex flow meters and electro magnet flow meters are used in water treatment plants

1 Answers   Elite Construction,

---

How to connect PLC to DCS ?

2 Answers   Alkyl Amines,

---

Range 8 Kg/cm2, alarm to be set at 2Kg/cm2, at wat pressure reciever switch to be calibrated? justify the ans?

3 Answers  

---

hi this is noor in my work spot, i arranged THERMOCOUPLE in the place of RTD. (in FEED WATER tank). can i use T/C or not?

10 Answers  

---