Diaphragm seal pressure gauge

The SMT3151CTLT Diaphragm Sealed Pressure Transmitter, measures the pressure of gases, liquids and vapors and converts them into a 4-20mADC current signal output.

Product Details

SMT3151 CTLT diaphragm seal pressure gauge

Diaphragm-sealed pressure transmitters,

which are used to prevent media in the pipe,

from entering the pressure sensor assembly directly into the differential pressure transmitter.

They are connected to the transmitter by fluid-filled capillaries.

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The SMT3151CTLT Diaphragm Sealed Pressure Transmitter, 

measures the pressure of gases,

liquids and vapors and converts them into a 4-20mADC current signal output.

What is a diaphragm pressure gauge?

The  SMT3151 CTLT diaphragm seal pressure gauge,

is a special-purpose product specially designed,

a pressure indicator with diaphragm seal,

for the medical and food fields such as medicine, beer, milk warehouse, etc.

The series uses E+H expertise and is designed,

to comply with hygienic standards in the pharmaceutical and food industry.

The flushing large corrugated sheet,

is used to isolate the measuring medium from the pressure sensor,

and the sanitary and special oil are filled therebetween,

to ensure stable operation without temperature drift at a high temperature of 150 ° C.

Overcoming the common flush-type diffused silicon,

or ceramic capacitor transmitter commonly used in industrial fields,

due to the direct contact of the sensor with the medium,

Therefore, the temperature drift is high,

under high-temperature conditions,

especially when the sterilization environment is very easy to damage.

The diaphragm-sealed pressure transmitter sealing diaphragm,

is used to prevent the medium in the pipeline,

from directly entering the pressure sensor assembly in the differential pressure transmitter.

It is connected to the transmitter by capillary filled with fluid.

The SMT3151CTLT Diaphragm Sealed Pressure Transmitter measures the pressure of gases,

liquids and vapors and converts them into a 4-20mADC current signal output.

The SMT3151CTLT can also communicate with each other,

via the BRAIN Communicator or the CENTUM CS/μXL

or HART 475 Communicator for setting and monitoring.

When should You use a diaphragm seal?

Pressure gauges are often used in extreme conditions in industrial processes,

and some gauges are designed for use in the environment of these difficult processes.

These tough process meters typically include hardened casings,

liquid-filled casings, and a stress-reducing Bourdon tube design,

and they are usually equipped with a diaphragm seal,

to prevent heat or corrosive media and the pressure gauge itself.

Diaphragm seals are protected from dangerous hot spots,

viscous, or pressure gauges with corrosive media,

and significantly extend the life of the equipment.

Understanding diaphragm seals


The sealing membrane is connected to the gauge,

and can be a method of direct connection or passage through a capillary.

The operation of the elastomer or flexible metal diaphragm,

in contact with the gauge maintains the process medium.

The chamber between the diaphragm and the pressure gauge is filled with fluid,

to accurately convey the pressure in the process medium from the hydraulic device.

Any change in the medium pressure of the process is sent,

through the flexible diaphragm insertion system,

and then connected to the Bourdon tube of the meter.


Diaphragm seals can be easily mounted on gauges using threads,

flanges, wires, sanitary, or other types of connections.


In most cases, the diaphragm seal mechanism and diaphragm itself are stainless steel,

but the instrument industry leader, such as Wicker,

also produces other materials for diaphragm seals,

including carbon steel and Hastelloy C-276 for specific applications. The design pressure of Wika's diaphragm seals is applied from 10" Hg to 20,000 PSI and between -130°F to + 752°F.

Diaphragm seal differential pressure transmitter

Features of Diaphragm seal differential pressure transmitter:   

1 Adoption of microprocessor enhances its flexibility and function;

2 Have strong self-diagnostic capability;

3 Without mutual effect between zero adjustments and range adjustment;

4 The complete function of remote & local setting and calibration;

5 Two-wire systems, conforming to HART protocol and be capable of uninterrupted output with HART protocol terminal communication;

6 To compensate for temperature and static pressure by adopting digitized compensation technology;

7 Good stability, high accuracy, adjustable damping, and good single-track overload ability;

8 Without mechanical drive parts, little maintenance work, strong resistance to vibration;

9 All general parts satisfy the convenience of maintenance.

You may be interested in what is the pressure transmitter. 

Manufactured in China under strict ISO 9001 quality standards,

Huaheng offers a broad variety of diaphragm seals pressure gauge,

for the industrial markets.

Huaheng Diaphragm Seals pressure gauge are carefully designed,

built, and tested to maximize performance, increase instrument durability, and assure operator safety.

Along with superior product quality,

Huaheng is proud to offer responsive customer service,

intuitive online product configurators, and the industry’s quickest lead times.

More differential pressure transmitters.