Diaphragm Sensing Pressure Gauge

The diaphragm pressure gauge consists of a circular membrane, made from sheet metal of precise dimensions, which can either be flat or corrugated.

The diaphragm is mechanically connected to the transmission mechanism which will amplify the small deflections of the diaphragm and transfer them to the pointer.

The process pressure is applied to the lower side of the diaphragm, while the upper side is at atmospheric pressure. The differential pressure arising across the diaphragm, lifts up the diaphragm and puts the pointer in motion.

The deflection of the diaphragm is very small (+/- 1 mm) making it necessary to use a high-ratio multiplying movement to rotate the pointer along the full length of the scale. The actuation of such a high-ratio transmission mechanism is possible because diaphragm deflection is able to generate large forces.

Flat and corrugated diaphragms

The diaphragm must be made in such a way that the deflection is linear, i.e. that a similar increase in the pressure should always correspond to a similar deflection of the diaphragm.

For industrial applications, usually corrugated metal diaphragms are being used. The corrugations ensure that the diaphragm will be more elastic and they are arranged such that the deflection of the diaphragm is linear.

Diaphragm pressure gauges are used for relative pressure as well as for vacuum, compound and differential pressure applications.

Due to the presence of a diaphragm, these gauges are extremely suitable for use on viscous media. For corrosive gases and liquids, the diaphragm may be coated or covered with a foil.

By default, these diaphragm gauges are provided with male threaded connection.

For highly viscous, impure or crystallizing media, however, it may be necessary to use an open connection flange in order to prevent clogging of the process connection. Open connection flanges are available from DN15 to DN80. The most common sizes are DN25 and DN50.

At Goa Thermostatic Pressure gauge division, we manufacture diaphragm sensing Pressure gauges which can measure a range as low as 0/25mBar or 0/250mmWc uptil 0/40 bar or 0/40 kg/cm2.

Refer TABLES for ranges available, connection types and the various options available with the supply of Temperature gauges.

At Goa thermostatic we manufacture the following:

Diaphragm sensing Pressure gauge : PG140 Series

Temperature Gauges Pressure Gauges Thermowells Thermostatic

  • All Stainless Steel construction.
  • Weather-proof casing to IP:65, IS:13947.
  • Dry and Filled versions.
  • Shatter-proof glass as a standard.
  • Micro-gear pointer for zero re-set.
  • Blow out disc at the rear of the case.
Scope of supply : PG 140 Series Diaphragm sensing pressure gauges with threaded process connection.
Model Number (Typ) : PG140# Series P-D-B-1-6-S4-S6Ti-S6-S4-0/4000mmWc-S4-S6-3N-O.
Case : SS304, Weather-proof to IP:65, IS:13947, bayonet bezel ring.
Dial Size : 150 mm(6”), white background with black numerals.
Sensing : Diaphragm in SS316.
Socket : SS316.
Movement : SS304.
Pointer : Micro-gear adjustment type for zero re-set.
Window : Toughened Glass.
Range : As shown against tag nos in mmWc.
Overall inaccuracy : ± 1% FSD.
Overrange protection : 125% FSD.
Blow Out Disc : Neoprene rubber, provided at the back of the case.
Diaphragm housing
Top Chamber
: SS316.
Bottom Chamber : SS316.
Process Connection : 3N…½”NPT(M).

Notes

1) Our standard for Diaphragm sensing Pressure gauges is with Dial Size in 6”(150mm) only.

2)These assemblies can be used for low pressure MMT applications.

*Please note the following parameters can be varied by referring to the model decoding sheet:
Model Number, Diaphragm and Socket Material, Range and unit of measurement required, Accuracy required , the Connection to process, top chamber and bottom chamber material.

Diaphragm sensing Pressure gauge with Flanged Process connection: PG150 Series

Temperature Gauges Pressure Gauges Thermowells Thermostatic

  • All Stainless Steel construction.
  • Weather-proof casing to IP:65, IS:13947.
  • Dry and Filled versions.
  • Shatter-proof glass as a standard.
  • Micro-gear pointer for zero re-set.
  • Blow out disc at the rear of the case.
Scope of supply : PG 150 Series Diaphragm sensing pressure gauges with flanged process connection.
Model Number (Typ) : PG 150 Series P-D-B-1-6-S6-S6Ti-S6-S4-0/600-S6-S6-1”150#RF-O.
Case : SS304, Weather-proof to IP:65, IS:13947, bayonet bezel ring.
Dial Size : 150mm (6”), white background with black numerals.
Sensing : Diaphragm in SS316.
Socket : SS316.
Movement : SS304.
Pointer : Micro-gear adjustment type for zero re-set.
Window : Shatter-proof Glass.
Range : As shown below in mmHg.
Overall inaccuracy : ± 1% FSD.
Overrange protection : 125% FSD.
Blow Out Disc : Neoprene rubber, provided at the back of the case.
Diaphragm housing
Top Chamber
: SS316.
Process Connection : 1” flanged to ANSI B16.5, 150#RF in SS316

Notes

1) Our standard for Diaphragm sensing Pressure gauges is with Dial Size in 6”(150mm) only.

2) These assemblies can be used for low pressure MMT applications.

*Please note the following parameters can be varied by referring to the model decoding sheet:
Model Number, Diaphragm and Socket Material, Range and unit of measurement required, Accuracy required ,the Connection to process, top chamber and bottom chamber material.

 

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