Why we use negetive (-)voltage in vibration system
Answers were Sorted based on User's Feedback
actually in proximaty probes inside used PNP tanasistor.so
transistor baising supply need - dc voltage.
Is This Answer Correct ? | 14 Yes | 2 No |
Answer / chandrakant sahu
There is PNP type transistor used in ocsilator and also ti keep minimum interference negative voltage is suitable for this
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / waleedmahmoud
The basic reason is that the power supply is -24 VDC. So
since the supply voltage is negative the output voltage
will be as well.
IRD at one time made prox probes with a positive supply and
as a result a positive output.
Way back in the 50's uncle Don Bently made a design
decision to use a negative supply voltage (back then it
was -18 VDC rather than -24 VDc in the modern device) in
his circuit. This decision has stuck and is now even
included in the API standards
Positive are also there for example.
Metrix 5465F is -ve gap voltage
Metrix 5465E is +ve gap volatge
It does not make much of a difference wether you use
positive or negetive voltages. It is -ve because Bently
started with the design of -ve and now we stick to -ve.
Is This Answer Correct ? | 4 Yes | 5 No |
Answer / md. rizwan
Because we measure the negative voltage in vibration system.
Is This Answer Correct ? | 3 Yes | 19 No |
Why mmwc unit is used?
What is meant by GAP VOLTAGE, in vibration measurement. Normally how much GAP VOLTAGE is set and state the reason.
What do you know about gail?
what is cavitation ?
meaning of SMART
why 4-20 mA signal is preferred over a 0-10V signal
what is HVAC?
how to replace the smart transmitter software
why bevelling is done in an orifice ?
what is loop?
in plc source and sink meaning?
1- Explain about HPM 2- What is the FSC and explain the configuration of FSC 3- explain the complete loop of vibration, how it works (field to control room) 4- What is the use of proxymitter? 5- During job your partner effected with H2S then what you have to do. 6- what type of gland packing uses when valve glind is leaking.