SMT3151 Diaphragm Seal Pressure transmitter

Diaphragm Seals also referred to as chemical seals,
are used in applications,
where the pressure sensor requires isolation from the process media.

These applications may be corrosive, high temp, clogging,

or need a sanitary fluid to remain captured in the piping or vessel.

Rather than the process fluid interfacing with the pressure sensor,

the pressure is exerted onto the flexible diaphragm and transmitted hydraulically,

to the instrument through the fill fluid.

When mounted and filled a diaphragm seal assembly will have minimal effect,

on the instrument’s performance.

So, till now, you know what is a diaphragm seal?

Let’s find more about Sino-instrument Diaphragm Seal Pressure transmitter.

Diaphragm Seal System

Diaphragm seals are used to prevent process medium,

from entering into the pressure-sensing assembly of the Differential pressure, Gauge pressure,

or Absolute pressure transmitter.

Applications which is suitable for diaphragm seal system

  • For measuring the liquid level, density, flow and pressure of ;
  • high/low-temperature fluids;
  • highly corrosive/high viscosity fluids ;
  • the fluids which may cause clogging of impulse piping in the low temperature ;
  • toxic fluids;
  • the fluids containing suspended solids, which are deposited in the impulse piping and may cause clogging.
How do diaphragm seals work?
How do diaphragm seals work?

How do diaphragm seals work?

Diaphragm seals, also known as chemical seals or remote seals,

are used for pressure measurements,

when the process medium should not come into contact,

with the pressurised parts of the measuring instrument.

A diaphragm seal has two primary tasks:

1. Separation of the measuring instrument from the process medium

2. Transfer of the pressure to the measuring instrument

The process side of the seal is isolated by a flexible diaphragm.

The internal space between this diaphragm and the pressure measuring instrument,

is completely filled with a system fill fluid.

The pressure is transmitted from the measured medium,

by the elastic diaphragm into the fluid,

and from there to the measuring element,

i.e. to the pressure measuring instrument or the transmitter.

Typical applications where a diaphragm seal provides a cost-effective solution,

to protecting the pressure instrument are:

  • In applications where the process fluid is corrosive;
  • In applications where the process fluid has a high viscosity,
    is comprised of slurries, sludge or other material that can actually coat,
    or damage a traditional pressure measuring device;
  • In applications where the process fluid can freeze or polymerize,
    thus causing a condition that might lead to the instrument becoming immobilized,
    or incapable of transmitting an accurate pressure measurement or signal.

Often, between the diaphragm seal and pressure measuring instrument,

a capillary is connected in order (for example),

to eliminate or to minimize temperature effects,

from the hot fluid to the measuring instrument.

These are Why You Should Use a Diaphragm Seal.

A Remote seal is mounted to the process by threaded,

flanged, in-line, sanitary, or other connections.

Usually, the fittings consist of T-pieces which are integrated into a pipeline,

or of welding sockets which are welded to a pipeline,

the process reactor or a tank.

This diaphragm seal type offers the advantage,

that the “contact surface” between pressure medium

and the diaphragm is relatively large,

thus ensuring accurate pressure measurement,

especially for very low pressures (< 600 mbar).

Although standard remote seal bodies and diaphragms,

are made of stainless steel, a variety of materials,

from carbon steel to Hastelloy® C-276,

are available to meet the demand of most applications.

A remote seal from Sino-Instrument can operate in pressure applications from 10″ Hg to 20,000 psi,

and media temperatures between -130°F and 752°F.

We can try to Learn more about the functionality,

areas of application and advantages of a diaphragm seal in the following video,

which offered by Wika.

Diaphragm type pressure transmitter

Sino-Instrument diaphragm seals mounted with pressure gauges,

process transmitters, pressure switches, differential pressure transmitters, etc,

are recognized and valued internationally for the most difficult of measuring tasks.

By using diaphragm seals,

the measuring instruments can be used at extreme temperatures from -130 to +750 °F,

and with aggressive, corrosive, heterogeneous, abrasive, highly viscous or toxic media.

The optimal diaphragm seal designs, materials,

and filling media are available for each application.

Remote seals are used to protect pressure-measuring instruments,

including pressure gauges, pressure transmitters,

and switches from hot, viscous, contaminated, or corrosive media.

SMT3151 Diaphragm seal system pressure transmitters

Diaphragm seal system pressure transmitters 1

3151T flange type remote pressure transmitter

The selection is as follows:

3151TGP4SF00S1M4B4 0~40kPa

1199FFW A50AADL03H00

On behalf of the 3151TGP base table plus an American standard 2”150LB flange type remote transmission device, the capillary length is 3 meters.

For the specific flange size and selection, please refer to the 1139FFW flange type remote transmission device flange specification drawing and selection specifications table

Diaphragm seal system pressure transmitters 2

3151T flat remote pressure transmitter

The selection is as follows:

3151TGP4SF00S1M4B4 0~40kPa

1199PFWA50AADL03H00 On behalf of the 3151TGP base table plus an American standard 2”150LB flat remote transmission device, the capillary length is 3 meters.

For the specific flange size and selection, please refer to the 1199PFW flat type remote transmission device flange specification drawing and selection specification table.

Diaphragm seal system pressure transmitters 3

3151T type insert barrel remote pressure transmitter

The selection is as follows:

3151TGP4SF00S1M4B4 0~40kPa

1199EFWA50AABDL03H00 On behalf of the 3151TGP base table plus an American standard 2”150LB plug-in remote transmission device, the capillary length is 3 meters, the insertion barrel length is 100mm.

For the specific flange size and selection, please refer to the 1199EFW type plug-in remote transmission flange specification and Selection specification sheet

3151T threaded remote pressure transmitter

The selection is as follows:

3151TGP7SF00S1M4B4 0~1000kPa

1199RTWA1AADL03H00 On behalf of the 3151TGP base table plus a threaded connection remote transmission device, capillary length of 3 meters,

user connection thread specifications 1/2NPT-14 specific size and selection situation see 1199RTW type threaded connection remote transmission device specifications and selection specifications sheet.

Diaphragm seal system pressure transmitters 5

3151T type three clamp type remote pressure transmitter

The selection is as follows:

3151TGP5SF00S1M4B4 0~100kPa

1199SCWA1A0DL03H00 On behalf of the 3151TGP base table plus a three-clamp type remote transmission device, the capillary length is 3 meters, the user connection clamp specification is 1 1/2 inch.

For the specific size and selection, please refer to the specification of the 1199SCW three-clamp type remote transmission device and Selection schedule

Diaphragm seal system pressure transmitters 6

3151GP/DP flange type remote pressure transmitter

The selection is as follows:

3151GP4SF22S1M4B3 0~40kPa

1199FFW A50AADL03H00 On behalf of the 3151GP base table plus an American standard 2”150LB flange type remote transmission device, the capillary length is 3 meters.

For the specific flange size and selection, please refer to the 1139FFW flange type remote transmission device flange specification drawing and selection specifications sheet.

Diaphragm seal system pressure transmitters 7

3151GP/DP flat remote pressure transmitter

The selection is as follows:

3151GP4SF22S1M4B3 0~40kPa

1199PFWA50AADL03H00 On behalf of the 3151GP base table plus an American standard 2”150LB flat remote transmission device, the capillary length is 3 meters.

For the specific flange size and selection, please refer to the 1199PFW flat type remote transmission device flange specification drawing and selection specification sheet.

Diaphragm seal system pressure transmitters 8

3151GP/DP type insert barrel remote pressure transmitter

The selection is as follows:

3151GP4SF22S1M4B3 0~40kPa

1199EFWA50AABDL03H00 On behalf of the 3151GP base table plus an American standard 2”150LB plug-in remote transmission device, the capillary length is 3 meters, the insertion barrel length is 100mm.

For the specific flange size and selection, please refer to the 1139EFW type plug-in remote transmission flange specification and Selection specification sheet

Diaphragm seal system pressure transmitters 9

3151GP/DP type threaded remote pressure transmitter

The selection is as follows:

3151GP7SF22S1M4B3 0~1000kPa

1199RTWA1AADL03H00 On behalf of the 3151GP base table plus a threaded connection remote transmission device, capillary length of 3 meters, user connection thread specifications 1/2NPT-14 specific size,

and selection situation see 1199RTW type threaded connection remote transmission device specification drawing and selection specification sheet.

Diaphragm seal system pressure transmitters 10

3151GP/DP type three clamp type remote pressure transmitter

The selection is as follows:

3151TGP5SF22S1M4B3 0~100kPa

1199SCWA1A0DL03H00 On behalf of the 3151GP base table plus a three-clamp type remote transmission device, the capillary length is 3 meters, the user connection clamp specification is 1 1/2 inch.

For the specific size and selection, please refer to the specification of the 1199SCW three-clamp type remote transmission device and Selection specification sheet

Data sheet of SMT3151 Diaphragm Seal Pressure transmitters

If you still have any question about :

diaphragm seal pressure gauge installation;

what is diaphragm seal pressure transmitter;

diaphragm seal pressure transmitter principle;

diaphragm seal pressure transmitter working;

remote seal level transmitter calibration;

diaphragm seal pressure transmitter calibration;

or, the diaphragm seal pressure transmitter installation

You can contact us any time.

Sino-Instrument offers SMT3151 Diaphragm Seal Pressure transmitter,

which can work the same as Wika diaphragm seal pressure transmitter;

diaphragm seal pressure transmitter Rosemount;

Yokogawa diaphragm seal pressure transmitter.

Sino-Instrument are diaphragm seal manufacturer,

we can offer you automated instruments from China, With best price.

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