HART pressure transmitter is an SMART pressure measurement product. It is compatible with analog two-wire 4~20mA signals and HART protocol.
Users can use HART communicator to manage, adjust or monitor process variables of HART instruments running in the process. It can also be configured on site using buttons for easy operation.
3051 HART Smart pressure transmitter that provides simplified field change, while communicating asset management data utilizing the latest HART 7 specification.
Sino-Inst offers a variety of HART pressure sensors for industrial pressure measurement. If you have any questions, please contact our sales engineers.
What is a hart in a pressure transmitter?
What is a communication protocol? A communication protocol refers to the specification for data exchange between different devices. In a pressure transmitter, a communication protocol is used to achieve data transmission between the transmitter and other devices.
HART is a digital communication protocol used for communication protocols between field intelligent instruments and control room equipment. The HART protocol can establish two-way communication between a 4-20mA sensor and a controller equipped with a two-way HART communication circuit.
Therefore, the pressure sensor can send a digital signal to the controller through the HART protocol. The controller can send commands to the sensor to set and adjust parameters.
The HART communication protocol of the pressure transmitter provides two synchronous communication channels: a 4-20mA analog signal and a digital signal. The 4-20mA signal uses a 4-20mA current loop to transmit the main measurement value.
The HART protocol allows digital information to be transmitted on a 4-20mA transmission loop. Therefore, without adding equipment, the coexistence of digital and analog signals can be achieved.
The HART protocol can simultaneously transmit analog signals and digital signals. Therefore, it is widely used in practical applications.
HART communication uses a digital signal superimposed on the analog signal of the pressure transmitter to transmit other device information of the pressure transmitter.
The digital signal of the pressure transmitter contains information from the device. Including device status, diagnostics, additional measurements or calculated values, etc.
The combination of these two communication channels of the pressure transmitter provides a low-cost, highly reliable, and complete field communication solution for pressure transmitters that is easy to use and configure.
Benefits of HART pressure transmitters
- 4mA～20mA DC current output superimposed HART® protocol digital communication (two-wire system);
- Adopt digital compensation and nonlinear correction technology;
- -10℃～80℃ digital wide temperature compensation;
- With local and remote zero and span adjustment functions;
- Key operation on site for easy configuration;
- Shorten troubleshooting time from discovery to problem solving;
- Continuously verify the integrity of loops and control/automation system strategies;
- Improve asset efficiency and system availability;
- Quickly determine and verify control loops and device configurations;
- Use remote diagnosis to reduce unnecessary on-site inspections.
Featured Industrial HART Pressure Transmitters
HART pressure transmitter is a complete product line of liquid level, differential pressure, gauge pressure and absolute pressure transmitter. Models include flushing diaphragms and sanitary flanges for liquid level measurement, hydrostatic tank metering – HTG. And wetted parts of various materials to suit the process requirements.
What is a HART transmitter?
HART transmitters are much more complicated.
The HART transmitter has the same pressure input and 4-20 mA output. But it also has an analog current loop output. The device contains some digital variables and settings. Access to these digital parameters requires the use of a HART configurator or communicator. This is essential for maintaining these devices.
Just like Hart Communicator 375.
In fact, many HART devices, cannot be maintained without access to digital parameters.
You may like: Verabar Flow Meter
What is HART calibrator?
HART calibrator is our HART communicator for calibrating instruments. For example pressure transmitter, DP transmitter, liquid level transmitter, flowmeter, and temperature transmitter.
HART communication protocol (Highway Addressable Remote Transducer) is a hybrid analog + digital industrial automation open protocol.
Its most significant advantage is that it can communicate through the traditional 4–20 mA analog instrument current loop, sharing only a pair of wires used by the analog host system.
We use this protocol in the HART calibrator.
HART communicator (such as HART 475) is the most common HART calibrator.
The proprietary calibration process ensures optimal temperature compensation. This limits the thermal impact on the sensor output.
It is suitable for the global process control industry. It provides a cost-effective solution for the use of conventional HART transmitters (such as the HART 475 field communicator).
How to calibrate a pressure transmitter using Hart?
A pressure transmitter is one of the most common instruments in a process plant. To assure its accuracy, it needs to be calibrated.
But what do you need to calibrate it and how is it done?
You may know how to calibrate a pressure transmitter? Or, how to calibrate a differential pressure transmitter? Then, calibrate HART pressure transmitters, kind of like pressure transmitter calibration using a hart communicator. Pressure transmitter manufacturers have improved accuracy and technology, designed into these smart pressure measurement devices.
To calibrate a pressure transmitter, you need:
loop supply (if not connected to the controls system’s loop supply);
a pressure generator to generate input pressure;
an accurate calibrator to measure the input pressure;
an accurate calibrator to measure the output mA current.
Typically, the pressure transmitter is a HART protocol transmitter. So in case, there is any need to adjust/trim it, you will need to use a device supporting HART communication.
How to calibrate HART pressure transmitters?
Explaining how to do the calibration would result in quite a long text. So we have put together a video for you instead. The video shows you how to calibrate and trim a HART pressure transmitter. Please have a look at the video: How to calibrate HART pressure transmitters
Video source: https://www.youtube.com/watch?v=4wLCqH0M9fU&t=9s
HART Pressure Transmitters Calibration Steps
How to calibrate HART pressure transmitters?
Total Time:
1. Isolate the transmitter from the process being measured and its loop wiring.
2. If measuring the mA signal across the transmitter test diode leave the wires intact, but note this method does not give the best mA measurement accuracy.
3. Connect the mA measurement jacks of the 754 to the transmitter.
4. Connect the pressure module cable to the 475, and connect the transmitter test hose from the hand pump to the transmitter.
Press the HART button on the calibrator to see the configuration of the transmitter.
5. Press HART again and the calibrator will offer the correct measure/source combination for the test.
6. If documenting the calibration press As-Found, input the test tolerance and follow the prompts.
7. If the measured mA signal at the test points is found within tolerance the test is complete.
If not, change is required.
Select, adjust, and trim the pressure zero, mA output signal and input sensor.
If you still do not know, how to check the pressure transmitter? Or, how to calibrate a pressure transmitter.
Just contact us.
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Sino-Inst offers over 20 SMART HART Pressure Transmitters. About 50% of these are 4-20ma Low-Pressure Transducers, 40% are Differential Pressure Gauge, and 20% are Diaphragm Seal Pressure transmitters, 20% are 4-20ma differential pressure transmitters.
Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. HART Pressure Transmitter 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.
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Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.