The pressure sensor on the selection of main basis: will be subject to the nature of the measured medium index, in order to save money, ease of installation and maintenance for reference. If the medium to be measured for high viscosity, easy to crystallization, corrosive, must choose isolation transmitter.

Is what should be considered in the selection of flow body medium corrosion of metal bellows, must choose good bellows material, otherwise will be a very short time after using diaphragm corrosion, bad flange will be corrosion caused by bad equipment or personal accident, so the bellows material selection is critical. Pressure sensor of the bellows material has the common 316/316 stainless steel, stainless steel, 304 l stainless steel, tantalum material, etc.

Should consider when in the selection of the temperature of the measured medium, if the temperature is high, up to 200 ℃ ~ 400 ℃, should choose type high temperature, or pressure sensor silicone oil will produce vaporizing expansion, making measurement is accurate.

What should be considered in the selection of equipment level of work pressure, the pressure of pressure sensor level must be consistent with the service. From an economic perspective, bellows and insert part material is more important, should choose appropriate, but connect LAN can reduce material requirements, such as selection of carbon steel, chrome plated, it will save a lot of money.

Isolation type pressure sensor had better choose threaded connection form, save money already so, installation is convenient.

For normal pressure sensor selection, also want to consider to the corrosion problem of measured medium, but the use of medium temperature can not be considered, because the ordinary is bring pressure to the table, work when the temperature is normal temperature for a long time, but the normal use of maintenance amount is larger than isolation. First is the heat problem, guide, pressure pipe freezes when the temperature below zero pressure sensor can't work or even damaged, this will increase the device such as heat insulation box.

From an economic point of view, selection of pressure sensor, as long as it's not easy to crystallization medium are normal pressure sensor can be used, but also for low pressure crystallizable media can also add purging medium to indirect measurement (as long as technology allows for purging liquid or gas), the application of normal pressure sensor is regular inspections on more than maintenance personnel, including all kinds of pressure pipe leaks, purging medium is normal, heat preservation is good, as long as the safeguard, the extensive use of normal pressure sensor can save a lot of one-time investment. When maintenance should combine soft hardware maintenance and maintenance.

From the selection of pressure sensor measuring range, average pressure sensor has a certain range adjustable scope, it is best to use the range of scope in its range of 1/4 ~ 3/4, such precision is assured, for micro differential pressure sensor is more important. In the practice of some applications (level measurement) need of sensor measurement range migration, according to the on-site installation location to calculate the measurement range and the quantity of migration migration, migration has positive transfer and negative transfer.

At present, the intelligent pressure sensor has been quite popular, its characteristic is high precision, large range of adjustable, and the adjustment is very convenient, good stability, should consider more items.