1. Categories >> Engineering >> Instrumentation
  2. Suggest New Category

Why we use 4 to 20 mA, (This is International Standard)
instaed of this can we use 4-16, or 4-24 or 3- 15 or any
other range

Question Posted / mayur

Answer Posted / mayur

ans. 5,6,7 & 8 r correct.only two points add.
1.in ancient time,niddle type galvanometers are used,only if
we pass 4mA current it shows deflection.therefore 4mA.
2.if 21mA current will pass through our body,man can goes
dead.therefore 20mA. & 4-20 mA can divided into 5 equal %.

Is This Answer Correct ?    4 Yes 12 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

who's take first position in process in the timing of new installation flow transmitter and control vavle. give the answer with logical trick.

4236

Differentiate between ultrasonic flowmeter and radar type flow meter

738

what would be the minimum flow rate that we can measure on rotameter..?

1620

in differential pressure transmitter,min&max pressure range for hp&lp

1524

Yokogawa CENTUMVP R6.09 unable to download to Engineering Station with ExaOPC R3.75 The issue is when I try to download the common project section to the Engineering Station (STN) from the HIS in System View, it is unable to connect. The error displayed is: WARNING: Could not connect to equalize destination. (7001) Retrying. Number of retries = 0/1 ERROR: LdXopsLoadMain: connect error 10060 ERROR: Processing terminated due to connection error. (7002) Equalization end with errors. STN0149 ---- ERROR = 2 WARNING = 1 ---- Background: >Updated the ExaOPC software on the STN from 3.60 to 3.75 >STN operating system is Windows Server 2008 R2 >HIS operating system is Windows Server 2016 Stanard Solutions attempted include: >Ensuring all IP addresses are correct and all networked devices can be pinged. >The ability to ping a device using its host name from another device ( from HIS) >Ensure both devices firewalls are disabled. >The antivirus installed on the STN is disabled. >Ensuring both devices are within the same workgroup. >Added both devices to each other's Host and LMHost files. >Running IT Security tool after changing any administrative settings.

1619




How is work 5/2 sov?

1376

How to calibration coriolis flow meter?

1283

1. For Steam drum level signal, why do we compensate with drum pressure signal? 2.For main steam Flow signal is comensated with main steam temperature signal and main steam pressure signal why?

1771

Sir, I want junior executive, Instrumentation question papaer for IOCL, Plz send to arabinda.ghosh83@gmail.com

1680

how to calculate signal cable sizing? and multipair cable sizing??explain in brief?

1892

the 3 most common transmitter protocol being in refinery or qatar gas and aramco.

2477

plz tell me clearly about PID.."when v have to change I value,D value,GAIN??

1679

detail of mass flow meter pricipal

1813

what is loop1 and loop2 in MTS LT?

4180

i am preparing for BARC ,so plz mail me how to prepare for BARC. ALSO IF POSIBLE SOME RELATED QUESTIONS. MY MAIL ID IS khushi_4uall2003@yahoo.co.in

2544