Answer / s.sasikumar

thermocouple can connected in series with polarities
reversed to measure difference between two temperatures.
steps:
1.take 2 themocouples
2.connect in series and give it to mesuring device.
3.display shows the temperature difference between two
thermocouples.

Answer / carl_ellis

By connecting many thermocouples in series a device called a
thermopile can be constructed to produce substantial amounts
of voltage and current.

Two uses of thermopiles are

a) analytical measurement of infrared (IR) radiation.
1940's-1970's IR Ray-o-Tube or Radiamatic thermometers used
thermopiles to create a measurement signal.

b) source of electrical or heat power, such as the heat
energy transferred from hot junctions to cold junctions, the
Peltier Effect, where electric current transfers heat
energy. The transfer is bidirectional, Peltier cells are
commonly used for refrigeration, to remove heat in order to
achieve 'cold'.

Carl Ellis
Measure First

Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72

0 Answers  

---

how to calibrate Necleuonic level transmitter.?

0 Answers  

---

Any can guide for QA/QC Inspector in oil & gas region, the procedures, formats standards, design criteria, i search in all enginees but i can't found wat i need?????????

4 Answers   Aramco, Asian Paints,

---

for commissioning the DPT and Flow Transmitter , what kind of necessary activities we have to check and do? specially that orifice flange valve[ isolation valve}

1 Answers   L&T,

---

Relation in MMWC to Flow rate

1 Answers  

---

what is start up vent valve ? why it is used in boiler?

8 Answers   ACC, Bhushan Power Steel,

---

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 difference between pressure,flow and level control valve.

3 Answers  

---

How can we use feedback signal frm rtd for monitoring and in dcs for controlling ,then which type of rtd is sutaible 2 , 3,4wire and why ?

0 Answers  

---

Please anyone answer my question, what is the difference between single acting and double acting control valve, in what condition we better choose single acting rather than double acting

2 Answers  

---

Gas equation

0 Answers   CCIE,

---

what is difference between RTD , thermo couple and thermistor in general ?? (except temperature co-efficient )

5 Answers   Bilt,

---