How to solve the problem of Rosemount differential pressure transmitter migration failure

Create Date: 2024-8-30 12:03:23|Source: Rosemount/Rosemount

The migration of differential pressure transmitters is a form of application, which refers to the process of artificially moving the measuring point of a differential pressure transmitter from the zero point to the required value. The migration of differential pressure transmitters includes positive migration and negative migration, and the following is an analysis of their detailed migration problems.

How to solve the problem of Rosemount differential pressure transmitter migration failure

1. Positive migration

The positive migration of a differential pressure transmitter refers to the phenomenon that the initial value of the differential pressure transmitter is greater than zero when it is measured. In order to determine the measurement accuracy of the pressure transmitter that is being moved, we try our best to adjust the three-valve group of the differential pressure transmitter.

1. Close the positive and negative pressure measurement rooms, open the balance valve at the same time, and judge whether there is a problem with the relocation according to the appearance of the output signal on the transmitter. When the output value is less than 4mA, it can be determined that there is a problem with the triple valve of the differential pressure transmitter or the positive pressure chamber leads.

2. Turn on the vent switch of the differential pressure transmitter and close the pressure point of the positive pressure chamber. When the output value is greater than this value, there are two main reasons for this phenomenon, one is the zero position of the differential pressure transmitter, and the other is that the migration amount is too large in the relocation process, and the reason for the output value is less than 4mA is just the opposite of the above situation.

2. Negative migration

Negative migration of a differential pressure transmitter refers to a condition where its measurement starting value is less than zero. In order to determine whether there is a problem with the application of negative migration, the following two methods can be used.

1. When the positive and negative pressure measuring chamber is closed and the balance valve is opened, the output value of the transmitter should be 20mA.

2. Turn over the vent switch and close the pressure point of the positive pressure chamber, and the output value of the transmitter should be 4mA.

After the analysis and comparison of the two numerical sizes of 20mA and 4mA, it can be judged whether the differential pressure transmitter has any problems such as migration and incorrect zero position, whether it is positive migration or negative migration, once the problem occurs, it will have an impact on the output of the instrument. Therefore, it is necessary to have a certain understanding of the causes and solutions of migration problems.

More on that

	Factors to consider when installing a Rosemount 644 temperature transmitter Rosemount 644 temperature transmitter must be considered when installing the factors, only we solve these unfavorable factors, in the installation of the Rosemount temperature transmitter will not encounter some unnecessary things routine Electrical temperatures such as RTDs and thermocouples ...
	How to troubleshoot the Rosemount 3051 differential pressure transmitter if it encounters problems 1. Line failure When the computer in the Rosemount transmitter monitoring system shows abnormal values, it is necessary to immediately check the line status of the junction box of the differential pressure transmitter to see if there is a short circuit, etc., and the way to check is to measure the resistance. ...
	What is the difference between a Siemens transmitter and a Rosemount transmitter Differences between Siemens transmitters and Rosemount transmitters: Siemens' transmitters are piezoresistive pressure transmitters, while Rosemount's transmitters are capacitive pressure transmitters. The transmitter converts the output signal of the sensor into other signals that can be recognized by the controller.
	Rosemount 3051 Pressure/Differential Pressure Transmitter Zero Point Adjustment Method Rosemount differential pressure transmitter zero point adjustment 　　Before zeroing, admit that the balancing valve is nearly open, and use a flathead screwdriver to turn the zeroing screw. The clockwise conditioning output increases, the counterclockwise conditioning output decreases, and the zeroing resolution can reach 0.01% of the set range.
	Rosemount transmitters feature two-way communication The intelligent Rosemount transmitter is composed of a sensor and a microprocessor (microcomputer), which makes full use of the computing and storage capabilities of the microprocessor to process the data of the sensor, including the conditioning of the measurement signal (such as filtering, amplification, A/D conversion, etc.), data display, etc.
	How to maintain the United States rosemount3051 pressure transmitter Rosemount pressure transmitters often have some common faults in the whole process of accurate measurement, and the immediate judgment and resolution of common faults is especially important for the manufacturing that has been carried out. According to the work experience in the usual maintenance, people have summarized and sorted out some ...
	The Rosemount 3051 transmitter has its own advantages 1. The five-year stable soil is 0.125%, which can greatly reduce the cost of verification and protection. 2. Faster dynamic response, which can reduce the variability of the process. 3. The co-plane planning can realize a comprehensive measurement scheme. 4. Compact and lightweight coplanar planning with the best function ...
	Rosemount 3051 transmitter mounting What are the factors that affect the functionality of the Rosemount 3051 differential pressure transmitter? What are the factors that affect the functionality of the Rosemount 3051 differential pressure transmitter? Unique to Rosemount, the typical North and South American device method, the head-mounted 3051 transmitter with threaded sensors. 1. Heat ...
	The meaning of the Rosemount transmitter fault code indication Press Limit: The process variable read out by the transmitter is not within the transmitter range, which means that the range of the set volume exceeds the range of the transmitter cassette, and the solution is to replace the transmitter cassette. 　　Temp Limit: ...
	How the Rosemount 3051 pressure transmitter works The 3051 pressure transmitter is used to measure the level, density, and pressure of liquids, gases, or vapors, and then convert the pressure signal into a 4-20mADC signal output. There are mainly capacitive pressure transmitters and diffusion silicon pressure transmitters, ceramic pressure transmitters, strain gauge pressure transmitters, etc. 　　 ...
	An indispensable accessory for Rosemount transmitters Before selecting a Rosemount transmitter, it is necessary to consider whether it is a threaded device or a flanged device, and the flanged device is divided into a single flange device and a double flange device. In order to let you better choose the flange, we have summarized some knowledge about the flange type: Threading ...
	The Rosemount Twisted Square thermowell avoids wake shedding When a problem arises in the design of Rosemount thermowells, it is necessary to analyze the cause of its failure, and then go further and propose solutions. In some less complicated cases, it may be necessary to make a small change, such as adding one millimeter without changing the predetermined measurement orientation ...
	Features and performance of Rosemount pressure sensors Features and performance of Rosemount pressure sensors 1. Diffusion silicon pressure sensor The working principle of the diffusion silicon pressure sensor is that the pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramic), so that the diaphragm produces a micro-displacement proportional to the pressure of the medium, ...
	What are the features of the Rosemount 644 temperature transmitter? 1. It can greatly reduce the cost of wire and labor. 2. The advanced diagnosis function can reduce the number of on-site repairs. 3. Order a complete temperature transmitter and temperature sensing assembly to simplify setup, specifications, and ordering, and then reduce costs. 4. Adopt HART communication protocol. ...
	The Rosemount flow meter indicates the cause of the failure During the long-term use of the Rosemount flowmeter, there may be some problems in the manual: 1. The manual is not accurate for a long time; 2. There are always no signs; 3. It means that the fluctuation range is large and there is no reading; 4. The indication does not return to zero; 5. There is no indication when the flow rate is small; 6. When the large flow indicates that the positive ...
	That's how Rosemount transmitters should be selected Rosemount transmitter selection requires a good transmitter before use, so its selection is very important 1. According to the pressure interface mode Generally, threaded connection is the standard interface method. 2. According to the required accuracy level Measurement error of the transmitter ...
	The Rosemount 3051 transmitter is prone to some failures 1. The pressure of the 3051 transmitter does not go up to the output of the transmitter, the output of the pressurized transmitter does not change, and the output of the pressure transmitter changes suddenly, and the zero position of the pressure relief transmitter cannot be returned. In this case, you should see if the pressure interface is leaking or blocked, and after looking at the wiring method and power supply, ...
	Rosemount transmitters are affected by the angle of inclination of the installation The actual working performance of the Rosemount transmitter will be affected by the angle of inclination, ambient temperature, static pressure and fluid temperature of the device.
	How the Rosemount transmitter is wired During the use of the Rosemount transmitter, wire the Rosemount transmitter according to the following steps: 1. Take out the Rosemount 3051 and remove the electronic enclosure marked "FIELD TERMINALS". 2. Will be positive ...
	Features of the Rosemount Transmitter 3051S Series High Precision Transmitters: Features of the Rosemount Transmitter 3051S Series High Precision Transmitters: Advanced diagnosis Advanced diagnosis provides ongoing process monitoring to ensure the integrity and security of the process environment. The Statistical Process Monitoring (SPM) skill alerts you to deal with issues and anomalies. This comprehensive ...