Answer / sanjay

t/c and rtd use for tempreture measurement.

Answer / deepak nayak

A thermocouple consists of two conductors of different
materials (usually metal alloys) that produce a voltage in
the vicinity of the point where the two conductors are in
contact. The voltage produced is dependent on, but not
necessarily proportional to, the difference of temperature
of the junction to other parts of those conductors.
resistance temperature detectors (RTDs), are sensors used to
measure temperature by correlating the resistance of the RTD
element with temperature. Most RTD elements consist of a
length of fine coiled wire wrapped around a ceramic or glass
core. The element is usually quite fragile, so it is often
placed inside a sheathed probe to protect it.The material
has a predictable change in resistance as the temperature
changes; it is this predictable change that is used to
determine temperature.

Answer / sathish

temperature

what is the difference between RS 232,RS 485,RS 422, how they different from each other

15 Answers   TCS,

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I work on a electronic positioner transmitter 4211 at the field.I connect my multimeter in series to get the current output then I calibrate it to 4ma in 0% of position of the valve and 20ma in 100% position of the valve.My problem is in the field I get the correct output current based on my multimeter but in the dcs they only receive 40% in a output 20ma of this positioner.Then I try to simulate in this analog card and they receive the equivalent percent on the value that I simulated.Is ther any possibility to reset the zero and span of this positioner 4211 fisher.And what other possibility I can do to fixed this.This is my email add ( landicho_randy@yahoo.com )

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what are the levels of automation?

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why OPC server is used in DCS?

2 Answers  

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How would you choose differential range?

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Name and describe at least 4 status indicators, typically found on a PLC

2 Answers  

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What is the use of single seated valve?

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Why do we have earthing cable in branch cable and shield in the same cable?

0 Answers   Process Control Technologies,

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I need to know steps to Calibration Valve Guard......

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how the 2.5bar pressure able to control the 40bar steam

8 Answers   IBM, PAFL, Thirumalai Chemicals,

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WHAT IS THE DIFF. BETWEEN SKIN TEMPERATURE AND PASSES TEMPERATURE..?

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WHAT DO WE MEANT BY INSTRUMENT MAINTENANCE IN SOFTWARE SIDE.

1 Answers  

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