Answer / carl_ellis

WHAT IS A SYMPTOM OF FAULT WITH THE SPAN OF AN INSTRUMENT?
1)ZERO-POINT AND 100% ARE CORRECT BUT NOT A MID-RANGE.
2)ZERO-POINT IS CORRECT ,BUT 1005 INPUT IS NOT GIVING 100%
OUTPUT. 3)LINEARITY PRBS. 4)1005 O/p IS CORRECT BUT ZEO
POINT IS WRONG.

The correct answer is 2, but number 4 also requires a span
correction.

1) The "Zero-point and 100% are correct, but not a
mid-range value" problem is a linearity problem.

2) The "Zero-point is correct, but 100% input is not giving
100% output" is a span problem.

4) The "100% output is correct but zero point is wrong" is
a zero offset AND a span problem because when the zero point
is corrected with the addition of a bias/offset, the 100%
point will shift up or down the same amount as the zero
shifted with the bias/offset correction. So the 100% point
will no longer be correct once the zero is corrected.
Hence, the zero AND the span will need to be corrected.

Carl Ellis
Measure First

i want to make project on process control using plc.please give me idea about this.

2 Answers  

---

In the field and in the control room different power supplies if used How to handle the ground

1 Answers   ITC Infotech,

---

what is the main supply source for pressure transmitter?

1 Answers  

---

how we convert Mili ampere to temp txt,level txt,flow txt,pressure txt range value

4 Answers   Saadi Cement,

---

How can you add value to this Industry if offered the job?

0 Answers   SNS,

---

What is 3 selection available when configure the burnout protection for controller

0 Answers   EI Electrotechnical Institute,

---

What is the difference between working pressure and calibration pressure of a control valve

0 Answers  

---

IF I WANT TO BUY A THERMOCOUPLE THEN WITCH PARAMETER I LOOK

1 Answers  

---

What is the difference between PLC and DDC?

0 Answers   Emami,

---

what is the difference between auto tuning and manual tuning of controllers(eg:PID,PI,PD CONTROLLERS )

2 Answers   GATE,

---

What is the PLC Level & type.

2 Answers   Bhushan Power Steel,

---

what is pt100 RTD, and does 100 stands for

8 Answers   Tata Power,

---