why we use negative 24vdc to a proximeter

Question Posted / princecharlesv

4 Answers
10550 Views
KNPC, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

why we use negative 24vdc to a proximeter..

Answer / venkatesh

In -ve voltage the rate of distabance is lesser than +ve
voltege.So we using -10vdc(some time-9.7 to -9.8vdc is
acceptable ).

Is This Answer Correct ?

11 Yes

3 No

why we use negative 24vdc to a proximeter..

Answer / munty

we use negative supply bcz the vibration sensor based on PNP
TRAANSISTOR philosophy, PNP the base voltage suppose to be
nagative.

Is This Answer Correct ?

9 Yes

1 No

why we use negative 24vdc to a proximeter..

Answer / manish k soni

we r not using negative supply but the 0utput
is set negative and this is ony the company
monopoly

Is This Answer Correct ?

2 Yes

7 No

why we use negative 24vdc to a proximeter..

Answer / smart dude

in vibration senseor we give -24 v in proximitor becoz it
have vaild reason
and reason is that becoz we have to take o/p of proximitor
is -10 to 0
and why we have to take the voltage o/p -10 to 0 is that
becoz and the distance b/w shaft and and sensor get less rf
signal is absobed by the meatal and voltage gets
down ,,,but acc to human mind setup as gap decrease singla
amount shoukld increase (as in case of 4 to 20 ma ),so we -
ve volatage o/p becoz as -ve voltage decrease it means vale
is increasing (acc. to math -4<-3)

Is This Answer Correct ?

5 Yes

13 No

Post New Answer

More Instrumentation Interview Questions

what different types of problems do occur while doing instrumentation commisioning and how to solve them? please explain in detail

0 Answers Process Control Technologies,

why we us isolation barrier in hazardous area how it works to protect the area and please clarify its current flow.

0 Answers

why we are using 4-20ma why cant we use 4-40ma

3 Answers

Level in tank under vacuum (Ex: Condensate Tank of Power Plant)is measured using D. P. type level transmitter. Tank is subjected to vacuum of 755mmHg. Is it possible to fill wet leg ( i.e. leg connected to top of vessel with low point of D. P. xmtr) with water?. Are there chances of water getting sucked under vacuum? if yes, what is the solution?

3 Answers

I have a close vessel tank which is under vaccum when in running condition so pl. Provide it's range for dp type tx whose flange to flange distance is 440 mm and density is 1

1 Answers

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

4 Answers

what is the standard controll pressure

1 Answers

what are the documents(Construction point of view for a process plant) submitted by contactor initially entering in to new site for client?

0 Answers NTPC, PSU,

what is flow and flowrate? definate and diffrentiate it? pls post a valid ans thanks in advance

2 Answers Qatar Gas,

Why ac supply load cell is used? Can we use the dc supply load cell?

0 Answers

What is 1:1 redundancy ?

0 Answers

what is flow equation of kg/hr to m3/hr

2 Answers Philips,

For more Instrumentation Interview Questions Click Here