Answer / mohamed rasik

skin type t/c:
this is one type of thermocouple used to measure surface
temprature of a body.

installation:
skin type thermocouple is directly welded to the surface
to which we have to measure the temperature with thermally
insullating pad,so that only surface temperature is to
collected rather than surrounding air temperature.

diff b/w skin type t/c from other t/c:

1.thermowell is no need in skin type
2.mass will be low in skin type

grounded thermocouple:
the junction of the thermocouple is welded to sheath of
the t/c
un-grounded thermocouple
The welded wire thermocouple is physically insulated from
the thermocouple sheath

diff b/w grounded and un grounded type:
1.in grounded type,the temp response is fast
2.in ungrounde type,electrical isolation from the sheath

Answer / giridharan

i would like to add up one point that skin t/c is one which
never as a shield and is directly connected to the body to
measure temperature...

please send the hpcl (instrumentation) model placement papers to my mail....

9 Answers   HPCL, Invensys, IOCL, ONGC,

---

what is the reason while warning lamp is on while the engine is cranking?

0 Answers   Jindal,

---

what are the types of a thermocouple

2 Answers  

---

what is the difference between plant earth and instrument earth? and what type of cable( cable size ) used for both? and why ?

0 Answers  

---

Why we use the double acting control valve in flow line?

3 Answers  

---

---

hi friends,im an instrumentation and contol engg student,can u hlp me of suggsting barc written question paper,my id is roysuvaranjan@gmail.com, cel no.9563591747

0 Answers   BARC,

---

what is an ambient temperature?

5 Answers   Reliance,

---

What unit is used for measuring comp. outlet flow. it is CFM, M3/hr or NM3/hr. ?

5 Answers   Jk Tyres,

---

What kind of feedback is used in DP cells.

1 Answers   CCIE,

---

What is the Temperature Co-officient of Resistance of PT- 1000 and PT-2000 ?

2 Answers   Adani, Birla, MEIL,

---

Why we use 4 - 20 ma?

6 Answers   IJT, ONGC,

---

1.can you use SCADA instead of DCS,DCS instead SCADA 2.Difference between DCS and PLC,can their role be reversed i.e. role interchange 3.Difference between RTU and PLC

0 Answers   IOCL, Lakshmi Machine Works,

---