Pressure transmitter is a kind of direct contact with the measured medium field instruments, often in high temperature, low temperature, corrosion, vibration and shock environment work, so the model selection of the pressure transmitter
, besides should consider ordinary instrument such as measuring range and accuracy to consider, the content of the work environment and is also one of the important indexes such as measured medium.
In general, under the pressure transmitter of type selection, main basis: with Katie instrument equipment factory details to understand general pressure measurement range (
Transmitter has certain range adjustable scope, it is best to use the range of 1/3 to 2/3 of scope in its range, so to ensure accuracy, is more important for differential pressure transmitter.
To determine the maximum number of measuring pressure in the system, generally need to choose a is larger than the maximum value 1.
About five times the pressure range of the transmitter.
Mainly in many systems, especially the water pressure measurement and processing, with peak and continuous irregular ups and downs, the instantaneous peak can destroy pressure sensor.
So you can use a buffer to reduce the pressure of burr, but this will reduce the response speed of the sensor.
So should fully consider when choosing transmitter pressure range, accuracy and stability.
Precision grade precision is the key to any process measuring equipment performance indicators, and equipment selection and maintenance of an important factor to consider.
, according to the scope of the pressure according to the technology allow maximum absolute error, first select the range, and then according to the technology allow maximum absolute error, calculate the instrument allows the maximum error of the reference, remove & plusmn;
Number and %, its value is accuracy.
If it does not have this level, depends on the accuracy level (
At the) high precision
Transmitter in different countries mark is not the same precision level.
Such as China and the United States and other countries, the underlying sensor precision is in the best part of linearity, also is what we usually call between 10% ~ 90% of the precision of the measurement range;
While the target accuracy, is the most bad part of the linearity, also is what we usually call measurement of 0 ~ 10% and the accuracy is between 90% ~ 100%.
The accuracy is 1%, such as the European sign in China mark accuracy is 0.
At present, most of the pressure differential pressure transmitter precision index of 0.
1% or 0.
075%, high precision index is 0.
05% or 0.
But the precision of the mentioned above is just a pressure differential pressure transmitter manufacturers provide indicators, when the user production actual application, if use to describe the overall performance error, only a tiny part of the actual application could reach the manufacturer to provide the overall performance of the error indicators, in most cases is a far cry from both.
Factors influencing the precision of mainly includes the range than in the actual application effect, the influence of temperature on the zero point, the influence of temperature on the range, the influence of static pressure to zero, and the influence of static pressure on the range, the pressure transmitter only need to consider the effect of temperature and range than, and differential pressure transmitter need to consider all the influence.
In addition, the factors affecting the precision of also include power impact, vibration, as well as influencing the installation location, but relatively small effects, these factors need to consider according to actual needs.
Measuring medium if measurement is relatively clean fluid, with a standard pressure transmitter can directly.
As for the high viscosity measured medium easy crystallization corrosion situation, must choose isolation transmitter.
Save selection should consider its medium corrosion of metal bellows, must choose good bellows material, otherwise, use very short time after ask outside diaphragm corrosion will be bad, the flange will be bad cause equipment corrosion and personal accident.
Transmitter of bellows material has ordinary stainless steel, 304 stainless steel, 316 l stainless steel, tantalum bellows material, etc.
Pick up liquid material general pressure transmitter in contact with the medium part adopts 316 stainless steel, if the measured medium for 316 stainless steel corrosion, so basically all the pressure transmitter is suitable for the measurement of medium pressure.
If measurement of 316 stainless steel corrosive medium, then USES the chemical seal, such not only can measure the medium pressure, and can effectively prevent the medium liquid part of the contact with the contact of the pressure transmitter, thus protect pressure transmitter, prolong the service life of pressure transmitter.
The medium temperature ten pressure transmitter signal is part of the conversion of electricity to line, so in general, the measurement of pressure transmitter for - medium temperature
30 to + 100 degrees, if the temperature is too high, generally USES is condensing bent to cooling medium.
The output signal at present because of the various acquisition, now in the market there are many kinds of pressure transmitter output signal.
Main 4 ~ 20 ma, 0 to 20 ma, 0 ~ 10 v, 0 ~ 5 v, etc.
But more commonly used is 420 ma and 0 ~ 10 v.
Cited above, the output signal, only 4 ~ 20 ma to contain two wire system grounding or shielded wire)
, the others are three wire system.
Other practices in some applications,
Need for transducer measuring range migration, according to the on-site installation location to calculate the measurement range and the quantity of migration migration.
At present, the intelligent transmitter has been quite popular, its characteristic is high precision, large range of adjustable, and adjustment is very convenient, good stability, should consider more items.
In addition, the pressure,
Process connection interface in the transmitter, pressure transmitter and power supply voltage, if used in special situation, consider explosion proof and protection grade.
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