Diaphragm seal pressure transmitter

Diaphragm seal pressure transmitter, diaphragm seal DP transmtter, also called remote pressure transmitters. Diaphragm seal pressure transmitter is the direct mount type pressure transducer. Diaphragm seal differential pressure transmitter is the Remote type. This Diaphragm seal connection can work with the capillary, flange and manufold.

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

What is diaphragm seal pressure transmitter?

Diaphragm seal pressure transmitter, is the flange type pressure transmitter. This type pressure transmitter, assembling diaphragm seals to field transmitters for the purpose of measuring pressure, differential pressure, level, and flow.

Model Transmitter type
SI-1305 Flange level transmitter
Code Scale range
2 3 4 5 0-20~100kPa(0-2000~10000mmH2O) 0-70~350kPa(0-7~35mH2O) 0-200~1000kPa(0-20~100mH2O) 0-700~3500kPa(0-70~350mH2O)
Code Output form
E Linear output 4-20mAdc
SF Linear output 4-20mAdc+HART signal,Full function buttons on site
F MODBUS-485 signal
Code Flange standard (high pressure side flange)
A ANSI American Standard (HG20615)
D DIN European standard(HG20592)
Code Process connection size
ANSI American Standard (HG20615) DIN European standard(HG20592)
25 1″ DN25
40 1.5″ DN40
50 2″ DN50
80 3″ DN80
00 4″ DN100
Code Process connection withstand voltage rating
ANSI American Standard (HG20615) DIN European standard(HG20592)
A 150LB PN16/25
B 300LB PN40
C 600LB PN64
D 900LB PN100
Code Measuring diaphragm
A 316 Stainless steel
B Hastelloy C
C Monel
D Tantalum
E Titanium
F Special requirements
Code Insert barrel length Insert barrel material
A 0 mm None
B 50 mm 316L Stainless steel
C 150 mm 316L Stainless steel
D 200 mm 316L Stainless steel
Code Filling liquid
D Ordinary silicone oil  (-40~104℃)
F High temperature silicone oil   (-40~304℃)
S Inert liquid  (-40~204℃)
Code Shell material Conduit inlet dimensions
A Low copper aluminum alloy polyurethane coating M20×1.5
B Low copper aluminum alloy polyurethane coating 1/2-14 NPT
C Stainless steel M20×1.5
D Stainless steel 1/2-14 NPT
Code Optional parts
M1 0~100%  Linear indicator
M4 LCD Multi-function digital display
Da Flameproof  ExdIIBT5Gb;(explosion-proof certificate No. : CE16.1163)
Fa Intrinsically safe ExiaIICT4 / T5 / T6Ga;(explosion-proof certificate No. : CE15.2354X)
CX With corresponding 316 flushing ring

What is remote seal?

Remote seals are commonly used to protect pressure-measuring instruments,

including pressure gauges, pressure transmitters,

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

As a result, they’re often used in refining, petrochemical, and chemical plants.

How a remote seal works

A remote seal, also referred to as a chemical or diaphragm seal,

is connected to the measuring instrument using a direct connection or capillary.

The instrument side of the seal is separated from the process media by a flexible diaphragm.

The chamber between the diaphragm and the instrument contains system fill fluid,

which transfers the pressure of the process media.

When fluctuations in pressure of the process media occur,

the change is transmitted across the flexible diaphragm through the system fill fluid,

which is hydraulically transmitted to the measuring instrument.

A Remote seal is mounted to the process by threaded, flanged, in-line, sanitary, or other connections.

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 WIKA can operate in pressure applications from 10″ Hg to 20,000 psi and media temperatures between -130°F and 752°F.

What is the principle of pressure transmitter?

Applications for Diaphragm Seal Pressure/ Differential Pressure Transmitters

Application 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.

You may like:
Sewage flow meters

What is a flow meter?

Ultrasonic flow measurement 

Industrial flow meters

Sino-Instrument is pressure transmitters manufacturer in China.

We offer all types of Pressure indicator transmitters.

Like Direct Mounted, flange-mounted, single flange, double flange,

Remote Diaphragm SealsHigh Static, Digital Remote.

Most of our pressure transmitters are used in oil, liquids,

DP transmitterflow measurementlevel measurement (like the ultrasonic level measurement),

density, and other process variables.

Pressure transducers are generally available with three types of electrical output;

millivolt, amplified voltage, and 4-20mA.

You can ensure product safety by selecting from certified suppliers,

with ISO9001, ISO14001 certification.

We will share more about instrument calibration, like the flow transmitter calibration.

Diaphragm Seal Pressure/ Differential Pressure Transmitters
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Diaphragm Seal Pressure/ Differential Pressure Transmitters
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