pressure transducer

[wozz]

ah i srr so a vertical float would have only been good for dry run protection?

 

[tomfj]

In my opinion if he wanted to use float switches he would need multiple ones to indicate different levels. but these would have an accompanying lack of resolution/accuracy and more complicated cabling. whereas with an analog device like the Vega the signal can be passed through a barrier to provide switching (Such as a P&F KFD2-CRG2-1.D) while also giving an accurate level indication all done in a panel with less wiring.
A big issue with multiple level switches is error signals. In general one faulty switch can freeze the entire system as they generally work in series. so a jammed float switch or one that has gone past its limit and is stuck in the wrong position will introduce a system fault.
if a float type is required i have seen a couple of types one with an arm like a ball cock valve but with a sensor and the other with a tube that moves vertically on a central core. In each case it was only once and i couldn't say how effective they were

 

[Bobster]

In my opinion if he wanted to use float switches he would need multiple ones to indicate different levels. but these would have an accompanying lack of resolution/accuracy and more complicated cabling. whereas with an analog device like the Vega the signal can be passed through a barrier to provide switching (Such as a P&F KFD2-CRG2-1.D) while also giving an accurate level indication all done in a panel with less wiring.
A big issue with multiple level switches is error signals. In general one faulty switch can freeze the entire system as they generally work in series. so a jammed float switch or one that has gone past its limit and is stuck in the wrong position will introduce a system fault.
if a float type is required i have seen a couple of types one with an arm like a ball cock valve but with a sensor and the other with a tube that moves vertically on a central core. In each case it was only once and i couldn't say how effective they were

I don't think this is an Ex install, it's not going to need a barrier if it isn't

 

[SheffSimon]

I don't think this is an Ex install, it's not going to need a barrier if it isn't

It's not that kind of barrier, it's a kind of signal conditioner which will power up the instrument, not ATEX kit.

 

[lewlec]

Hi

Thanks for everyone's replies, spoke to a company called ifm and they do a sensor that is accurate to 0.01 % so I may go for that although a bit pricey at £450. Danfoss make a cheaper version but up to 6 weeks waiting.

Thanks
Gary

 

[Steve1412]

Its not that pricey mate...The druck ones we use are nearly £900!!!!!!!