Difference between capillary and non capillary pressure gauges?

May i know the difference between a capillary and non-capillary pressure gauges? Based on the hook up drawings and search on google, capillary is used for remote mounted pressure transmitters with diaphragm seal but i have also seen pressure gauges with capillary though it is not remote mounted, Pretty confused here.
 
A non-capillary pressure gauge measures and indicates pressure with its sensing element directly sensing the process medium.

A diaphragm/capillary (or even a close coupled diaphragm seal) pressure gauge indicates pressure and reflects the temperature of its 'filled system, its diaphragm and filled capillary as an error in the process pressure indication, because the trapped fill fluid expands and contracts with temperature and that temperature expansion/contraction in a filled system results in pressure changes which are temperature related, not process pressure related.

The diaphragm isolates the pressure sensor element from the process medium, primarily for purposes of materials compatibility (corrosion), and occasionally for temperature isolation and even less often for purposes of providing some physical damping of a pulsating pressure signal. Gauges can be close-coupled to a diaphragm seal, so why would a capillary/seal gauge assembly be in service that is not remote mounted? Maybe, someone installed the spare capillary/seal/gauge assembly because the pressure range was appropriate and it was available and a close coupled version was 3 weeks delivery? Who knows?
 
A non-capillary pressure gauge measures and indicates pressure with its sensing element directly sensing the process medium.

A diaphragm/capillary (or even a close coupled diaphragm seal) pressure gauge indicates pressure and reflects the temperature of its 'filled system, its diaphragm and filled capillary as an error in the process pressure indication, because the trapped fill fluid expands and contracts with temperature and that temperature expansion/contraction in a filled system results in pressure changes which are temperature related, not process pressure related.

The diaphragm isolates the pressure sensor element from the process medium, primarily for purposes of materials compatibility (corrosion), and occasionally for temperature isolation and even less often for purposes of providing some physical damping of a pulsating pressure signal. Gauges can be close-coupled to a diaphragm seal, so why would a capillary/seal gauge assembly be in service that is not remote mounted? Maybe, someone installed the spare capillary/seal/gauge assembly because the pressure range was appropriate and it was available and a close coupled version was 3 weeks delivery? Who knows?
 
Is diaphragm pressure gauge and diaphragm seal pressure gauge different? Is there any pressure gauge where a diaphragm and bourdon tube element are present together in one gauge?
 
Pressure gauges are predominantly bourdon tube sensor elements. There are bellows and diaphragm gauges but it's a fractional percentage of pressure gauge market. Sanitary/hygenic applications use integral diaphragm seals on bourdon tube gauges. Elastomer diaphragms are used for very low pressure, draft range sensing and tend to be 'delicate'.

Diaphragm seals are devices used to isolate any pressure sensing element from the process.

A combination bourdon tube and diaphragm seal is an assembly of two separate devices: a bourdon tube pressure gauge which is mounted on a diaphragm seal, which is then evacuated with a vacuum pump and backfilled with fill fluid.
 
Does that mean that diaphragm seal is just an accessory used to protect the diaphragm element ? And a bourdon tube element pressure gauge can also come along with a diaphragm element which comes along with the diaphragm seal accessory?
 
A stand-alone diaphragm seal is an accessory that protects any sensing element on the 'other' side of the diaphragm.

gauge-diaphragm-seal-kobold.jpg

the sanitary gauge below is a bourdon tube gauge on an integral sanitary diaphragm
sanitary gauge with diaphragm seal.jpeg
 
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