What Is a Smart Pressure Transmitter?

Smart pressure transmitter is also called Smart pressure sensor or Smart pressure transducer. Smart pressure transmitter is the best pressure measuring instrument. It is also used to measure flow, liquid level, etc.

Smart pressure transmitter (Intelligent Transmitter) is composed of sensor and microprocessor (microcomputer). It makes full use of the computing and storage capabilities of the microprocessor. The sensor data can be processed. Including conditioning of measurement signals. Data display, automatic correction and automatic compensation, etc.

What Is a Smart Pressure Transmitter?

List of Featured Smart Pressure Transmitters

Advantages of Smart Pressure Transmitters

  • Smart Pressure Transmitters with reverse polarity and current limiting protection;
  • Laser trimming temperature compensation, wide range, anti-corrosion, suitable for a variety of media;
  • Strong overload and anti-interference ability, stable performance;
  • Unique display header design, optional analog and digital display headers;
  • The zero point and full scale can be adjusted through the hand-held communicator, and the range shift range is wide.

Extended reading: High accuracy pressure transducers

Zero and span adjustment

The zero point and span adjustment of the transmitter can be adjusted on-site through the buttons of the transmitter itself. It can also be adjusted remotely through a handheld terminal.

The specific method is: add zero pressure and stabilize. Press and hold the Z and S keys at the same time (Z is for zero adjustment, S is for range adjustment) and release for 5 seconds. Press the Z key for 2 seconds to adjust the zero point. After the full pressure is added and stabilized. Press the S key for 2 seconds to adjust the full range.

Note: The adjustment range of zero point calibration is ±8% of the pressure range. The span calibration range is 30% to 100% of the pressure span. Continuously adjustable. After adjustment, close the sealing cap and tighten.

Smart Pressure Transmitters Features

With automatic compensation capability. The nonlinearity, temperature drift, time drift, etc. of the sensor can be automatically compensated by software. It can self-diagnose, and the sensor can be self-tested after power-on. to check whether all parts of the sensor are normal. and make judgments. Data processing is convenient and accurate, and data can be automatically processed according to internal procedures. Such as statistical processing, removal of abnormal values, etc.

With two-way communication function. The microprocessor can not only receive and process sensor data. Information can also be fed back to sensors. The measurement process is thus regulated and controlled. Information storage and memory can be carried out. It can store the characteristic data, configuration information and compensation characteristics of the sensor.

With digital interface output function. The output digital signal can be easily connected with computer or field bus.

Extended reading: extrusion melt pressure transducer

Analog Pressure Transmitter VS Smart Pressure Transmitter

Analog Features

  • High precision
  • Span and zero point are continuously adjustable externally
  • good stability
  • Positive migration up to 500%, negative migration up to 600%
  • two-wire system
  • Adjustable damping, overvoltage resistance
  • Solid State Sensor Design
  • No mechanical moving parts, less maintenance
  • Light weight (2.5kg)
  • The whole series has a unified structure and strong interchangeability
  • Miniaturization (166mm total height)
  • Diaphragm material in contact with the medium is optional
  • Unilateral overpressure resistance
  • Low pressure cast aluminum alloy housing

Smart Features

  • Superior measurement performance for pressure, differential pressure, level, flow measurement
  • Digital accuracy: + (-) 0.05%
  • Simulation accuracy: +(-)0.75%+(-)0.1%F.S
  • Full performance: +(-)0.25F.S
  • Stability: 0.25% for 60 months
  • Turndown ratio: 100:1
  • Measurement rate: 0.2S
  • Miniaturized (2.4kg) all stainless steel flange for easy installation
  • Process connections are compatible with other products for optimal measurement
  • The world’s only sensor with H alloy sheath (patented technology), achieving excellent cold and thermal stability
  • Smart transmitter using 16-bit computer
  • Standard 4-20mA, with digital signal based on HART protocol, remote control
  • Support for upgrades to fieldbus and field control-based technologies.

Smart Pressure Transmitters Working Principle

Smart Pressure Transmitters/intelligent pressure transmitters are composed of pressure sensors and microprocessors.

It makes full use of the computing and storage capabilities of the microprocessor. It can process the data of the sensor, including the conditioning of the measurement signal (such as filtering, amplification, A/D conversion, etc.), data display, automatic correction and automatic compensation.

Microprocessor is the core of intelligent transmitter. It can not only calculate, store and process the measurement data, but also adjust the sensor through the feedback loop to make the collected data optimal.

Since the microprocessor has various software and hardware functions, it can complete tasks that are difficult for traditional transmitters.

Extended reading: Flat Pressure Sensor for High Viscosity Fluids

Smart Pressure Transmitter Communication Protocol

The intelligent pressure transmitter has three forms: voltage output (usually 0-5V), current output (4-20mA), and digital output. The reliability and stability of smart transmitters are very high, but they often encounter communication problems.

Smart Pressure Transmitter Communication Protocol

Since there was no unified communication protocol standard in the world when the smart transmitter was born, the communication protocols used by transmitters produced by various manufacturers are not the same.

A typical ST3000 such as Honeywell uses the DE protocol. Fisher-Rosement’s 3051 uses the HART protocol. There are also all-digital smart transmitters that follow the fieldbus communication standard.

HART protocol

The intelligent pressure transmitter HART (Highway Addressable Remote Transducer) is a frequency shift keying (FSK) technology based on the Bell 202 communication standard. Digital communication is realized by superimposing the frequency signal on the 4-20mA current.

2 different frequencies: 1200 Hz and 2200H: representing “0” and “1”, superimposed on the 4-20mA DC signal in the form of a sine wave. Because the average value of these sine waves is zero. Therefore, no DC component is generated. It will not affect the 4~20mA process signal. It completes true synchronous communication without interrupting the transmission signal.

Read more about: Beginner’s guide to HART Communicators-HART Protocol

DE agreement

The DE protocol of the intelligent pressure transmitter represents “1” and “0” by the amount of pulse current. Digital and analog signals are transmitted separately. When transmitting digital signals, analog signals must be interrupted.

HART communication frequency is high (about 1 ~ 2 kHz). The time constant of the network is required to be no greater than 0.65μs. In this way, the maximum capacitance of HART communication equipment and network limits the maximum distance of communication, which is generally not more than 400m.

Fieldbus Communication Protocol

Fieldbus is defined by IEC (International Electrotechnical Commission) as “a digital, serial, multi-point communication data bus between field devices installed in manufacturing and process areas and automatic control devices in the control room. bus.”

It is a fully digital, bidirectional, serial, multi-station communication network, and a pair of wires can transmit a variety of information.

smart pressure transmitter selection

The main basis for the selection of pressure/intelligent pressure transmitters:

The property index of the measured medium shall prevail, and the reference shall be to save money and facilitate installation and maintenance.

If the measured medium is high viscosity, easy to crystallize and strong corrosion, the isolation type transmitter must be selected. When choosing, consider the corrosion of its medium to the metal of the diaphragm. Be sure to choose the material of the diaphragm. Otherwise, the outer diaphragm will be corroded in a short time after use. The flange will also be corroded, causing equipment and personal accidents. So the choice of material is very important.

The membrane box materials of the transmitter include ordinary stainless steel, 304 stainless steel, 316L stainless steel, and tantalum membrane box materials. When selecting, the temperature of the measured medium should be considered. If the temperature is high, it is generally

Frequently Asked Questions

Pressure transmitters can be categorized into four main types:

  • Gauge Pressure Transmitter.
  • Absolute Transmitters.
  • Differential-Pressure Transmitter.
  • Multivariable Pressure Transmitters.

The smart pressure sensor is the most widely used sensor, which generally consists of elastic sensing elements and displacement sensing elements.

The function of the elastic sensing element is to make the measured pressure act on a certain area and convert it into displacement or strain. It is then converted into an electrical signal with a certain relationship to the pressure by the displacement sensitive element or strain gauge. Sometimes the functions of these two elements are combined.

More about: MEMS Pressure Sensors

A pressure transmitter is a device that converts pressure into pneumatic or electric signals for control and remote transmission.

It can convert physical pressure parameters such as gas and liquid sensed by the load cell sensor into standard electrical signals (such as 4~20mADC, etc.). Measurement, indication and process adjustment are carried out by supplying secondary instruments such as indicating alarms, recorders and regulators.

Generally speaking, regardless of the type, smart sensors include the following basic features:

  • self-compensation ability
  • Self-calibration function
  • Self-diagnostic function
  • Numerical processing function
  • Two-way communication function
  • Information storage and memory functions

With the development of science and technology, the functions of smart sensors will be gradually enhanced. It will use artificial neural network, artificial intelligence, information processing technology (such as sensor information fusion technology, fuzzy theory, etc.). Empower sensors with more advanced intelligence. It has the functions of analysis, judgment, self-adaptation and self-learning. It can complete complex tasks such as image recognition, feature detection, and multi-dimensional detection.

How the pressure sensor works:

  1. Piezoresistive force sensor:
    Resistive strain gauges are one of the main components of piezoresistive strain sensors. The working principle of the metal resistance strain gauge is the phenomenon that the resistance value changes with the mechanical deformation of the strain resistance adsorbed on the base material. Commonly known as the resistance strain effect.
  2. Ceramic pressure sensor:
    Ceramic pressure sensors are based on the piezoresistive effect. Pressure acts directly on the front surface of the ceramic diaphragm. The diaphragm is slightly deformed. Thick film resistors are printed on the back of the ceramic diaphragm. connected as a Wheatstone bridge. due to the piezoresistive effect of the varistor. The bridge produces a highly linear voltage signal proportional to the pressure and also proportional to the excitation voltage. The standard signal is calibrated to 2.0/3.0/3.3mV/V according to different pressure ranges, which can be compatible with strain gauge sensors.
  3. Diffusion silicon pressure sensor:
    The working principle of the diffused silicon pressure sensor is also based on the piezoresistive effect. Use the principle of piezoresistive effect. The pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramic). Make the diaphragm produce a micro-displacement proportional to the medium pressure. The resistance value of the sensor is changed, and the change is detected by the electronic circuit. And convert and output a standard measurement signal corresponding to this pressure.
  4. Sapphire pressure sensor:
    Using the working principle of strain resistance, using silicon-sapphire as the semiconductor sensitive element, it has unparalleled metrology characteristics.
    Therefore, semiconductor sensitive elements made of silicon-sapphire are used. It is not sensitive to temperature changes, and has good working characteristics even under high temperature conditions; sapphire has extremely strong radiation resistance. In addition, the silicon-sapphire semiconductor sensitive element has no p-n drift.
  5. Piezoelectric pressure sensor:
    The piezoelectric effect is the main working principle of piezoelectric sensors. Piezoelectric sensors cannot be used for static measurements. Because of the charge after external force. Saved only if the loop has infinite input impedance. This is not the case in reality, so this determines that the piezoelectric sensor can only measure dynamic stress.

There are many types of sensors that detect pressure.

The most commonly used is the silicon piezoresistive pressure sensor, which has the advantages of high sensitivity, large range, many varieties and reasonable price.

Others include ceramic capacitive pressure sensors, quartz pressure sensors, vibrating wire pressure sensors…etc.

Extended reading: Pressure Sensor Applications-Featured Industry Applications

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Sino-Inst offers over 20 Smart Pressure Transmitters.
A wide variety of industrial Smart Pressure Transmitters options are available to you. Such as free samples, paid samples.
Sino-Inst is a globally recognized manufacturer of industrial Smart Pressure Transmitters, located in China.
Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide.
Industrial Smart Pressure Transmitters products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

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