Pressure transmitters and transducers with industry-leading performance help improve operations in a wide range of industries

What is a pressure indicator transmitter?

Pressure indicator transmitters are an industrial instrument,
which has a digital display for providing a local indication of pressure indicating,
and a 4-20 mA output pressure transmitter (which also called the smart pressure gauge),
for sending an analog signal to control & monitoring instrumentation.
The built-in digital indicators can be scaled via push buttons or change pots,
to any pressure unit or a 0-100% full scaling.
No additional external supply is required,
since the digital indicator is powered by the 4-20mA current loop,
from the pressure transmitter.

Sino-Instrument can offer pressure indicator transmitters for differential pressure measurement,

pressure level measurement, and water pressure measurement.

Pressure indicator transmitters can work with manifold, diaphragm seal, hart, orifice plate,

to measure different types of flow or level.

Pressure indicator transmitter
Pressure indicator transmitter

Pressure Indicators

by Sino-Instrument

  • More Reliable
  • Better Price
  • Many Years of experience in development and production

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Email: [email protected]
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Types of the pressure indicator transmitters

Electronic pressure indicator

The basis for an electronic pressure indicator is formed by the pressure sensor.

It converts the measurement parameter of pressure into an electronic signal.

The advantage of electronic pressure indicator,

lies in the excellent dynamic performance and the low material stress.

This gives them a high load resistance and long-term stability.

They are available in very small sizes.

Sino-Instrument develops and produces all leading sensor technologies:

The ceramic thick film, metal thin film and piezoresistive.

Mechatronic pressure indicator

Electronic assemblies or components are integrated into a mechanical pressure indicator.

The measured pressure is displayed locally, however,

besides, the pressure indicator offers an electrical signal,

or includes an electrical switching function.

With these instruments, the measured value can also be read reliably on site,

if the power supply fails or the measuring signal is disrupted.

With the combination of mechanical pressure indicators with different signals and switches,

this results in a comprehensive range of mechatronic pressure indicators.

For our pressure indicators, we use the latest sensor technologies,

tested millions of times over in automotive applications.

They work without any kind of mechanical contact,

consequently, they are wear-resistant,

and there’s absolutely no influence on the pressure indicator.

Mechanical pressure indicator

Because of their robustness and simple handling,

indicating pressure indicators are widely used.

Their elastic pressure elements deform under the influence of pressure.

The measuring system is made from a capsule element,

diaphragm element or Bourdon tube.

The measuring systems are made from copper alloys, alloyed steels or,

if required for specific measuring tasks, from special materials.

Sino-Instrument manufactures mechanical pressure indicators,

with scale ranges from 0 … 0.007 psi up to 0 … 100,000 psi with indication accuracies of up to 0.1 %.

For pressure measurement with high dynamic pressure loads or vibration,

you will find mechanical pressure indicators with liquid filling in the Sino-Instrument portfolio.

Through their damping, they are optimally protected against destruction.

Diaphragm Seals

Even for the most demanding measuring requirements,

you’ll find the right solution with Sino-Instrument.

Diaphragm seals enable pressure measurement with harsh conditions such as,

for example, corrosive, highly viscous or fibrous media, very high temperatures,

awkwardly placed measuring points,

hygienic regulations or also toxic media or media harmful to the environment.

What is the function of a pressure transmitter?

The main function of the pressure transmitter is to transmit the pressure signal to the electronic device,

which in turn displays the pressure on the computer.

The pressure transmitter amplifies the weak electrical signal collected by the pressure sensor,

to transfer or activate the control element.

Or a signal source that converts the non-electricity of the sensor input,

into an electrical signal while amplifying it for remote measurement and control.

The analog quantity can also be converted to a digital quantity as needed.

The pressure sensor converts the mechanical pressure value into a proportional electrical signal.

The pressure sensor typically consists of a stable main body and a (thin) diaphragm.

The diaphragm is the most important element for the measurement of the pressure,

and is equipped with strain-sensitive and compression-sensitive resistance structures,

so-called strain gauges (DMS).

The diaphragm is deflected under the influence of pressure.

Thus, the strain gauges attached to it are elongated or compressed,

and its electrical resistance changes.

This change in resistance is directly proportional to the pressure.

For example, if the resistors are wired to a Wheatstone measuring bridge,

the resulting electrical signal can be measured and transferred to an indicator.

What is the difference between the pressure gauge and pressure indicator?

Pressure Indicator is an instrument that indicates pressure.

Pressure Gauge is also a type of pressure Indicator.

It is a mechanical device.

Pressure indicators can work on mechanical deflection (in case of pressure gauge) or Piezoelectric effect,

change in capacitance, change in inductance, etc.

These are generally digital type instruments.

What is the difference between the pressure switch and pressure transmitter?

Pressure Switches

A pressure switch is an active electromechanical device,

which measures the pressure in a system,

and when the pressure reaches too high or too low of a given set point,

the device will “switch” meaning it will open or close a circuit,

that powers a certain device (like an alarm system or a shutdown valve).

Pressure Transmitters (Transducers)

A pressure transmitter or pressure transducer, on the other hand,

is also an electromechanical device,

which measures pressure but instead of signaling a switch,

it merely sends a read-out signal of what the specific pressure value is to a remote location.

Usually, a pressure switch, rather than a transmitter,

will be used in pressure-system applications,

where safety is of paramount importance.

An oil wellhead, for example, can see some very high-pressure spikes,

and if the pressure reaches too high, a possible well blowout can occur.

A pressure switch in this application makes sense so that when the pressure reaches too high,

the switch can trigger a blowout preventer,

which can actuate to reduce pressure in the system.

In contrast, the pressure transmitter has no inherent mechanical switching element.

However, transmitters prove to be much more versatile in that,

via third-party software that interprets the given pressure reading,

they can be extremely useful for measuring efficiencies of pressure systems,

and can control many industrial functions,

such as inlets and outlets, chemical or fuel mixtures,

or can even act as a safety switch itself depending on how the software is set up to control the system.

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.

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