pressure transducer 4-20ma

The SI-300 4-20mA/ Voltage Pressure Transducer,

also called pressure transmitter 4-20mA,

is a pressure sensor with 20ma/Voltage output.

SI-300 4-20mA/ Voltage Pressure Transducer can be OEM as differential pressure, explosion-proof,

or sanitary, just as you require.

4-20mA/ Voltage Pressure Transducer are sensors with an electrical transmission output,

for remote indication of pressure.

Ideal for OEMs, process applications, water processing, and industrial pressure applications.

Features of SI-300 Pressure Transducer 4-20mA/Voltage

SI-300 Pressure Transducer 4-20mA/Voltage
SI-300 Pressure Transducer 4-20mA/Voltage

  • Sensor Type : Industrial Pressure Transducers
  • Pressure Range : 0 – 25 to 14000 psi
  • Output/Span : .5 – 4.5 V, .5 – 4.5 V, 1 – 5 V, 1 – 6 V, 10 mV/V, 4 – 20 mA
  • Type : Compound, Gage, Sealed
  • Accuracy : ±0.5% FSO

All of our pressure transmitters can work with the new AMS TREX

Specifications of SI-300 Pressure Transducer 4-20mA/Voltage

Range range -100kPa…0~10kPa…100MPa (14000psi)

Pressure type

gauge pressure, absolute pressure, sealing pressure

Power supply

24V, 12V

Output signal

4~20mA, 1~5V, 0~5V
Working temperature
-20 ° C ~ 85 ° C

Medium temperature

-20 ° C ~ 85 ° C

Storage temperature

-40 ° C ~ 125 ° C

Zero temperature drift

±1.5% FS (@-20°C~85°C)

Sensitivity temperature drift

±1.5%FS (@-20°C~85°C)

Overload pressure

150% FS

Mechanical vibration

20g (20~5000HZ)


100g (11ms)

Comprehensive accuracy

0.5, 0.3 optional


100MΩ /250VDC

Response time

≤ 1ms (up to 90% FS)

Long-term stability


EMC Surge

(IEC61000-4-5) 2KV

EMC static

(IEC61000-4-2) contact discharge 8KV, air discharge 15KV

Protection level


Explosion-proof grade

Intrinsically safe explosion-proof ExiaIICT4

Material Housing

stainless steel; isolation diaphragm 316L

Media compatible

with a variety of media compatible with 316L stainless steel

Applications of Pressure Transmitter 4-20mA

  • Industrial OEM Equipment
  • Water Management
  • Pneumatics
  • Hydrogen Storage
  • Sub Sea Pressure
  • HVAC/R Equipment
  • Control Panels
  • Hydraulic Systems
  • Data Loggers

Drawings of SI-300 Pressure Transducer 4-20mA/Voltage

We offer OEM and Reseller Discounts for all kinds of 4-20mA pressure transducer

4-20ma differential pressure transmitter

3151 dp transmitters manufacturer
3151 dp transmitters

The Smart Differential Pressure transmitter is upgraded differential pressure transmitter,

which can work with display, HART communicators, and 4-20mA output.

SMT3151DP smart differential pressure transmitters can be used for differential pressure measurement.

4-20ma pressure transducer wiring diagram

SMT3151 Diaphragm Seal Pressure transmitter
SMT3151 Diaphragm Seal Pressure transmitter

Diaphragm seals are used to prevent process medium,

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

orAbsolute pressure transmitter.

Industrial Pressure Transmitter

SI-390 Industrial Pressure Transmitter
SI-390 Industrial Pressure Transmitter

Industrial Pressure Transmitter, are precision engineered to fit most industrial pressure measurement applications.

Sino-Instrument can offer industrial pressure transmitters with the display, 4-20ma output,

which can work as a natural gas pressure transducer,

water pressure transmitter, wastewater pressure transducer.

Pressure transmitter with display

SMT3151 TGP -stainless steel sensor process, oil and gas industry_meitu_1
SMT3151 TGP -stainless steel sensor process, oil and gas industry

The Gauge Pressure Transmitter SMT3151 TGP,

has been specially designed for the process industry,

and measures vacuum, gauge and absolute pressure ranges of gases, steam, fluids, and dust up to 600 bar.

Submersible Pressure Transducer

submersible pressure transducer
submersible pressure transducer

Submersible pressure transducer with 4-20mA output,

is normal submersible pressure transmitter for level measurement.

Sino-Instrument Hydrostatic submersed level transducers are sensors,

with an electrical transmission output for indication of liquid level.

What is a 4-20mA Current Loop?

The 4-20 mA current loop is the prevailing process control signal in many industries.

It is an ideal method of transferring process information

because the current does not change as it travels from the transmitter to receiver.

It is also much simpler and cost-effective.

However, voltage drops and the number of process variables,

that need to be monitored can impact its cost and complexity.

By knowing these fundamentals you will be able to make more informed decisions,

about process control in your facility,

which could affect your bottom line.

In order to understand what a 4-20 mA direct current (DC) loop is and how it works,

we will need to know a little bit of math.

Don’t worry; we won’t be delving into any advanced electrical engineering formulas.

In fact, the formula we need is relatively simple:

V = I x R This is Ohm’s Law.

What this is saying is that the voltage (V) is equal to the current (I) multiplied by the resistance (R)

(“I” stands for Intensité de Courant, French for Current Intensity).

This is the fundamental equation in electrical engineering.

Consider the simple DC circuit above, consisting of a power supply and three loads.

A current loop requires voltage to drive the current.

This is provided by the power {PART 1} 12 supply,

with the voltage of the supply labeled as Vtot.

Current then flows through the loop, passing through each load.

The voltage drop at each load can be calculated from Ohm’s Law.

The voltage drop V1 across R1 is:

Every element in the loop either provides voltage or has a voltage drop.

However, the current, I am the same everywhere in the loop.

This is the critical principle of the 4-20 mA loop.

Current is the same in all places throughout the loop.

It may be difficult to understand why the current remains constant,

so consider your home’s water system as a comparison.

There is a certain amount of pressure in the water pipes pushing the water towards your house.

Voltage, in a similar fashion, acts as pressure, pushing current through the circuit.

When a tap inside your home is turned on, there is a subsequent flow of water.

The flow of water is analogous to the flow of electrons, or current.

The ability of the pressure to push the water through the pipes is limited by bends and restrictions in the pipe.

These restrictions limit the amount of flow in the pipe, similar to how a resistor limits the current.

The flow through the pipe, and likewise the current through the wire,

remains constant throughout the system, even though pressure, and likewise voltage,

will drop at various points.

This is why using current as a means of conveying process information is so reliable.

Components of a 4-20 mA Loop

Components of a 4-20 mA Loop
Components of a 4-20 mA Loop

1. Sensor
2. Transmitter
3. Power Source
4. Loop
5. Receiver

Why we use the 4 20mA in transmitting signal?

Why is it 4/20 mA?

The reason for using the current signal is that it is not susceptible to interference.

And the internal resistance of the current source is infinite,

the wire resistance is connected in series in the loop,

without affecting the accuracy,

and can be transmitted hundreds of meters on the ordinary twisted pair.

The upper limit is 20 mA because of the requirements of explosion protection:

the spark energy caused by the current interruption of 20 mA is not enough to ignite the gas.

The reason why the lower limit is not taken as 0mA is to detect the disconnection:

it will not be lower than 4mA during normal operation,

and the loop current will drop to 0 when the transmission line is disconnected due to a fault.

Usually, take 2mA as the disconnection alarm value.

There are two other reasons. One reason is to avoid interference.

Another reason is that the two-wire system is used at 4-20 mA,

that is, the two wires are the signal wires and the power wires,

and the 4 mA is used to provide the static working current of the circuit to the sensor.

Sino-Instrument offers over 50 pressure transducers 4-20mA/Voltage.

About 50% of these are 4-20ma differential pressure transmitters, 40% are Differential Pressure Gauge,

and 20% are Diaphragm Seal Pressure transmitters,
20% are 4-20ma pressure transducer wiring diagram.

A wide variety of pressure transducers 4-20mA options are available to you, such as free samples, paid samples. 

Sino-Instrument is a globally recognized supplier and manufacturer of 
pressure transducers 4-20mA, located in China.

The top supplying country is China (Mainland), which supply 100% of 
pressure transducers 4-20mA respectively. 

Sino-Instrument sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.

Pressure Transducer 4-20mA/Voltage products are most popular in Domestic Market, Southeast Asia, and Mid East. 

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Current Output, 4 – 20 mA Transmitters

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SI-300 Pressure Transducer 4-20mA/Voltage
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