Answer / munty

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

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 ).

Answer / manish k soni

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

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)

how can i calibrate a smart temperature transmitter used by druck 720 process calibrator?

0 Answers   Texas,

---

How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

2 Answers  

---

How to set up the various advanced process controllers, input the proper parameters, and tune those controllers given related control system information.

1 Answers   EID Parry,

---

how to calculate control valve bonnet size?? or how to select its material?

0 Answers   Jacobs,

---

What is the difference between fiber optic cable & Ethernet cable

2 Answers   BEMCO, CCC, Pidilite,

---

How to work ultrasonic flow meter ?

1 Answers  

---

How to convertion 100 m3/hr to mmH2O or to Kg/cm2?

0 Answers  

---

What are difference between automatic and manual control system?

5 Answers  

---

SOME OF YOUR QUESTIONS ARE NOT MAKING ANY SENSE SO TRY AND PUT IN A LITTLE BIT MORE EFFORT BEFORE YOU POST A QUESTION. WE WILL ONLY HELP THOSE WHO WE CAN SEE ARE TRYING TO HELP THEMSELVES.

0 Answers  

---

In VVVF DRIVES VOLTAGE IS ALSO VARY WITH THE FREQUENCY. HOW? WHAT IS THE DIRECT FORMULA RELATING THESE TWO.

0 Answers   India Cements,

---

What is seismic transducer?Where it is used?

1 Answers  

---

When doing a liquid seal on a differential flow transmitter , most of the time the sealing liquid will be heavier then the process fluid. For wich application will the sealing liquid be lighter than the process fluid if transmitter is mounted below the process line.

0 Answers   Chevron,

---