Answers were Sorted based on User's Feedback
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
|Is This Answer Correct ?||11 Yes||3 No|
Answer / munty
we use negative supply bcz the vibration sensor based on PNP
TRAANSISTOR philosophy, PNP the base voltage suppose to be
|Is This Answer Correct ?||9 Yes||1 No|
Answer / manish k soni
we r not using negative supply but the 0utput
is set negative and this is ony the company
|Is This Answer Correct ?||2 Yes||7 No|
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|
What is CNC
What is smart positionar
Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
plz exlain the dcs system of ABB sympony hamnony
how to know the URL and LRL for steam drum level and why the calibration range is in negative ?
Why humidity limit is 30 to 55 % for raw material storage?
Using your own examples solve a problem involving normal table. (experimental method and analysis)
In closed loop control there are several “blocks” used to show the interactions between the process and the control system. These blocks are referred to as the “process” and the “controller.” Describe the relationship between these two blocks when creating a well tuned control loop.
what pressure transmitter?
Turbidity analyzer working principle ?
What is the basic principle of vibration measurement by BENTLY NEVADA vibration measurement system? and Why it gives the -ve voltage output?
i have height of stem drum level 1000mm.how i calculate the DP transmitter