Answer / richard marks

an i/p converter converts current to pressure. To calibrate
we first need to determin the range of the input and the
output. The current input is usually 4-20mA and the output
is usually 3-15psi (usual industry standards).
Calibration assuming the above input/output:

First connect a milliamp source to the input and a pressure
indicator (pressure gauge, druck etc.) to the output.
Inject a 4mA signal (0%) and check the output is reading
3psi, if not adjust the zero until the output reads 3psi.
Next inject a 20mA signal (100%) and check the output is
reading 15psi, if not adjust the span until the output
reads 15psi. Again inject a 4mA signal and check the 3psi
output as adjusting the span can alter the zero and if it
has changed and adjust as required. Check the span again at
20mA and repeat until the converter reads 3psi at 4mA and
15psi at 20mA repeatedly. Next check the linearity by
injecting signals for 0, 25, 50, 75 & 100% the output
should read as follows;
0% (4mA) 3psi
25% (8mA) 6psi
50% (12mA) 9psi
75% (16mA) 12psi
100% (20mA) 15psi

Answer / rithesh

I/P converter - all the instrument calibration principal
will be same. In beanch calibration we have to give
pnumatic input of instrument air/ nitrogen with pressure of
1.4 bar or kg/cm2 or 21 psi and we have to fix a test gauge
of 0 to 1.5 bar(kg/cm2)/ 0 to 20psi at pnumatic output. now
we have to connect mA source to I/P converter. we have vary
the mA 4 to 20. the result will be like this.
input 4mA output will be 0.2 bar(kg/cm2) / 3 psi
input 8mA output will be 0.4 bar(kg/cm2) / 6 psi
input 12mA output will be 0.6 bar(kg/cm2) / 9 psi
input 16mA output will be 0.8 bar(kg/cm2) / 12 psi
input 20mA output will be 1 bar(kg/cm2) / 15 psi
if output not match with input we have to set things by
adjesting Zero and Span adjesting point.

Answer / sree

first give the 20 psi working pressure on inlet port . then give the input of 4 to 20 mA . first give 4 ma then check the out put in out let if nt get the 3 psi adjust the zero adjustement, then give 8 ,12 , 16,and 20MA,THEN WE GET Correspondent outm put of 6 , 9 , 12,15 psi,if not get the 15 psi adjust the span adjustment.(test equipment: pressure generating instrument,mA Source,regulator, pressure indicator)

Answer / mohit

what is the ip convartor

why are set -10vdc in bently neveda vibration system.

4 Answers  

---

Watt is Wrms define rms?

2 Answers  

---

HOW TO CHOOSE FREAQUENCY IN FMCW TYPE RADAR INSTRUMENTS. DESIGN BASIS OR DESIGN CALCULATONS ?

0 Answers   Chevron,

---

WHY WE WILL USE 0-24VdC IN ELECTRONIC CIRCUITS AND INSTRUMENTATION TRANSMITTERS?

3 Answers   Aban Power, Jindal, JSW, Sugar Factory,

---

How a oxygen sensor & analyzer work at boiler or furnace, whats the principle & science is beyond this,How O2 sensor sence & convert signal & move toward analyzer & analyzer show reading in percent?

2 Answers  

---

What FLOW METER generally used in Gas plant?

5 Answers   Gasco,

---

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

0 Answers  

---

In RS 500 SLC 5/03 input change one module card to another card, plz. give steps clearly.

0 Answers   BHL,

---

WE ARE HAVING YOKOGAWA CENTUM CS 3000 DCS, 2 FCS AND 4 HIS " When the operation Download to HIS message appears: Equalize start. HIS0163 WARNING: Could not connect to equalize destination. (7001) Retrying. Number of retries = 0/1 ERROR: LdXopsLoadMain: connect error 10060 ERROR: LdXopsLoadMain: connect error 10060 ERROR: Processing terminated due to connection error. (7002) Equalization end with errors. HIS0163 ---- ERROR = 3 WARNING = 1 ---- Tell me, please, why and how to solve the problem."

6 Answers   Khas Pvt Ltd, Yokogawa,

---

what is the meaning of reverse action and forward action of control valve...

9 Answers   Honeywell, Yokogawa,

---

warning lamp does not light, but it does light when the wire from the lamp going to the sending unit is grounded (the part that plugs into the sending unit) what does this indicate)?

1 Answers  

---

what is piezo electric transducer?its principle?

2 Answers  

---