Answer / carl_ellis

Any thermocouple measuement requires 2 temperature measurements
- hot junction measurement
- cold junction measurement

A cold junction is created at the point where
non-compensation wire is connected to the thermocouple wire.

A measurement without compensation wire AND without a
corresponding cold junction measurement is not valid.

The only way to take a K type thermocouple measurement (or
any type thermocouple measurement) without compensating
cable is to use a temperature transmitter configured for the
type of thermocouple because the transmitter will perform
the cold junction measurement at its wiring terminals.

Carl Ellis
Measure First

how to adjust relay in smart positioner ?

1 Answers   SipChem,

---

how to trim the pressure transmitter ?

2 Answers  

---

Generally in which location ( JB or IO card or DCS) the thermocouple compensation is done.Also where they measure the atmosphere temp ( for compensation) in JB OR DCS panel? How they compensating that atmosphere temp? is any circuit for that ( like in rtd wheatstone bridge)?

3 Answers  

---

why we use only 4 to 20ma other than 0 to 16 ma

5 Answers   Invensys, Systech,

---

What is the DIfferences between SMART transmitters and PROFIBUS DP/PA Transmitters?

4 Answers  

---

what do u mean by compensating?in power plant where are compensating done?how level , flow compensated?

1 Answers   TATA,

---

Explain the mechanism behind the turbine meter.

0 Answers  

---

I am a instrument technician. recently i attend interview and face one of question for DP transmitter ,the client asking about the calibration of DP transmitter ,am answer the calibration procedure, they will ask one more question. why open LP side in atmosphere? i did not answer that question. so please help me and explain the particular question. Dear firends waiting for your valuable replay

3 Answers   Qatar Petroleums, Samsung,

---

what is the difference between sensor and tranducers?

12 Answers  

---

what is different betwen Process zero and atm zero?

1 Answers  

---

i have used level transmitter in starch cooking preparation tank. tank total height 2mtr.sometime LT display shows some error value when tank is fully empty and diaphragm side i already checked okay no problem in diaphragm area. field cable checked 24volt and mA shows correct value while tank empty mA is 4mA. 4mA i needed that 0% but display showing 10% or 15% percentage values are varying continously please give any good solution for me.....

0 Answers  

---

If fire would be inside the plant which fire detector is to detected the fire.

0 Answers   KOC,

---