Answer / nandan

The principle is that analyzer supplies a negative voltage
to transducer,who converts it into a frequency & sends it
across the probe.Now as the probe comes into the area of
rotor it creates a magnetic field & with it eddy current is
produced on the rotor side.Which changes the amplitude of
the frequency.It induces the voltage & remaining frequency
comes to the transducer through the return way.Transducer
converts it into the voltage .
Now coming back to the question The gap voltage has a
negative relation with the voltage induced i.e. as the gap
increases the induced voltage decreases.So to make it to
into a linear relation ship, negative voltage is supplied.
i.e

Gap Gap voltage
0 mm 0 vtg
1 mm -9 voltage
2 mm 18 voltage
& when the probe is in air it will have no induced voltage
so all -24 voltage without induced voltage will return back.

Answer / jigaranadkat

Because it has PNP transistor inside which requires base
bias of negative (-ve) supply.

Answer / darpan

The principle is that analyzer supplies a negative voltage
to transducer,who converts it into a frequency & sends it
across the probe.Now as the probe comes into the area of
rotor it creates a magnetic field & with it eddy current is
produced on the rotor side.Which changes the amplitude of
the frequency.It induces the voltage & remaining frequency
comes to the transducer through the return way.Transducer
converts it into the voltage .
Now coming back to the question The gap voltage has a
negative relation with the voltage induced i.e. as the gap
increases the induced voltage decreases.So to make it to
into a linear relation ship, negative voltage is supplied.
i.e

Gap Gap voltage
0 mm 0 vtg
1 mm -9 voltage
2 mm 18 voltage
& when the probe is in air it will have no induced voltage
so all -24 voltage without induced voltage will return bac

Answer / mohammed abbas

Because it is NPN tansistor during the initail days when
this was inveted by bently the cost of NPN transiator was
less. then they started use NPN transiator for the
vibration propbe, due to this we will give negative 24vdc
supply

Answer / shankar rao

negative feed back required.

Answer / sai kiran.c

does really negative voltage exists......???

how to rectify the poor signal strength in utrasonic digtial flow meter ,model:ge digital xce868i

0 Answers   KNPC,

what is the difference between mmhg & mmwc?. i want to calibrate a transmitter in the range of -100 to 300 mmwc. Which is the reference for calibrate the Tx,if mmwc not available?. Is it mmhg or mmho2?.

3 Answers   UPL,

How to connect PLC to DCS ?

2 Answers   Alkyl Amines,

which type inter lock use in petrochemical refinery,and oil & gas?

0 Answers  

An RTD is a_________________________.it works as follows

2 Answers  

how u calibate pr tx without master tx?

2 Answers  

why we use by pas on a positioner? When can a by pass be not used on a positioner ?

2 Answers  

What is stripper & spilitter ? Diffrence in this.?

0 Answers   JSW,

What is Square Root Extractor for?

9 Answers   Sabic,

how its work inductive proximity sensor explain briefly?

1 Answers  

key phaser where is use and work

0 Answers   BAP,

What is the difference between pneumatic and electro pnematic positioner?

3 Answers   TCS,