Answer / carl_ellis

Let's assume base metal elements only, since noble metal
elements are so expensive that they are under lock and key;
adequate protection from loss of identification.

For types T, J and K, (and by exclusion, E) the options are

-a spectropscopic assay which will positively reveal the
alloys' composition, but given that the cost of an assay is
proabably 20x times the value of a base metal element, it's
not likely to happen.

- visual identification of a type T by the copper color of
its positive leg which is copper. The alloy leg is a shiny
'metallic' color.

- testing Types J or K with a magnet.
The Type J positive leg is made of iron which has a very
strong magnetic attraction.
The Type K negative leg is made of a nickel alloy which is
mildly magnetic.
Type E is non magnetic, but so are other types.
It can be tricky to distinguish mild attraction on thin
gauge wire.

Testing with a multimeter can be very misleading, because of
the difficulty in determining both the hot junction AND the
cold junction temperatures. Without accurate temperature
values, of what use is a mV reading?

Carl Ellis
Measure First

Why Instrumentation Air Compressor called as Instrumentation Air compressor?pls dont just tell its trasferring IA to all transmitter,valves.I need exact reason, please......................

2 Answers  

---

for oil & gas industries which zone is normally preferred? why? give its example?

0 Answers  

---

how can we calibrate the differential pressure transmitter by using HART communicator

8 Answers   Hindalco,

---

what are the different types of terminal lugs used for wiring termination?

5 Answers   Yokogawa,

---

There are two chlorination tonners both are connected to two pressure swithes and the pressure switch is connected to SOV which operates the valve to changeover the tonner selection i.e if pressure one tonner goes low the other tonner should come in line if it is inautomatic selection design a circuit using relays ?

0 Answers  

---

Dear friends, I have a question: We work on a project which has some boilers to provide steam for desalination unit. The boiler area is safe and the only hazard source is the fuel lines of boilers. I want to know according to NFPA standard which type of instrument should be selected on the fuel line: Eex Type or Non-Eex type? Thanks in advance

2 Answers  

---

why fuse block is not used for AI signal?

0 Answers  

---

Explain the working of rota meter.

0 Answers  

---

please send the sample qustion paper for iocl written test ..

0 Answers   IOCL,

---

How can test or measure the probe and extension cable to identify if the problem at the probe or cable or at the driver it self? (pleast notify the measuring method)

0 Answers  

---

Foe selecting control valve if i have the min,normal & max data of flow rate,inlet pressure& outlet pressure,inlet tem.&density than how can i assure that these data are correct,pl. let me know if therew there is any method to check it.& also how we assure that the Cv we get from this data is suitable for valve for controlling require flow.

3 Answers   HPCL,

---

If any control valve create hunting problem, what is the possible reason and solution?

6 Answers  

---