Answer / omer baosman

A 2 wire xmitter is powered by the mother instrument. The
output signal(4-20ma) is returned on the same wires that
powers it. the main purpose of this design is to reduce
wiring cost, standrdisation of circuits, and above all, to
kep all the transmitters at same ground potential.

A 4 wire inst. has design flexibility to utilize any power
like, 230vac, 24 vdc or 110 vac. It can feed the signal to
any mother instrument. Wherever the basic sensor of an
instrment needs power other than 24 vdc (like chemical
analyser) u have no choice but to use a 4 wire xmitter.

State four different types of flow measurement.

4 Answers   ADMA OPCO,

---

what is mean by hot loop and cold loop testing, whts different between both

2 Answers   Honeywell, PDO,

---

what is the way of measuring air flow in air duct?explaim instruments used and DP creation in line?

3 Answers  

---

please tell me how to convert double acting ytc positioner yt-1200 into single acting ytc positioner ?

1 Answers  

---

instrumentation

1 Answers   Tata Steel Limited,

---

Describe all types and levels (4-20mA, 0-10V, mV, pulse, etc.)of analog and digital I/O used in process control application.

2 Answers   Jindal,

---

how to relay switch sense the fault?

0 Answers   ME,

---

Speedtronic system .

0 Answers   CCIE,

---

Yokogawa dcs normally where will change 4-20 MA to DC voltage( node or I/o cards?)

1 Answers  

---

hay friends, i am in trouble to understand PID controller. several times i have study but it is not clear to me have you a simple way to understand.

1 Answers  

---

Air pressure in a pressure vessel can rise or fall at up to 2.5kpa/s.The pressure is sampled every 0.5 seconds.If range of the the pressure indication is 0 to 1500 kPa, what is the max value of the error due to sampling in % of Span

2 Answers  

---

How to calibrate a orifice differential pressure flow transmitter in process?

1 Answers  

---