1 what kind of pressure, pressure transmitter to measure

To determine the maximum number of measuring pressure in the system, need to choose a typically has about 1.5 times larger than the maximum 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. Continued high pressure value maximum or slightly beyond the calibration of transducer will shorten the life of the sensor, it also can reduce accuracy. 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.

2, what kind of medium pressure

Viscous liquid, the mud will be blocked pressure interface, solvents or corrosive substances will destroy the transmitter in direct contact with the medium materials. These factors will decide whether to choose direct isolation membrane and direct contact with the media material.

The accuracy of 3, how much pressure transmitter

Accuracy of decision, nonlinearity, hysteresis, repeatability, temperature, zero offset calibration, the influence of the temperature. But mainly by the nonlinear and hysteresis, repeatability, accuracy is higher, the higher the price.

4, pressure transmitter, temperature range

Two temperature is usually a transducer calibration period, one of the temperature period is normal working temperature, the other is a temperature compensation scope, the normal operating temperature range is refers to the transmitter in the working status not be destroyed when the temperature range, while beyond the scope of temperature compensation may not reach its application performance metrics.

Temperature compensation scope is a typical range of smaller than working temperature range. Work within the scope of the transmitter will achieve its performance index. Temperature affects the output from the two aspects, one is zero drift, 2 it is to affect the full scale output. Such as: full range of + / - X % / ℃, readings of + / - X % / ℃, in the full scale beyond the temperature range of + / - X %, within the scope of temperature compensation readings of + / - X %, without these parameters, will lead to uncertainty in use. Transmitter output to the degree of change is caused by pressure changes, or caused by the temperature change. Temperature influence is to understand how to use the most complicated part of the transmitter.

5, what kind of output signals need to be

MV, V, mA and digital output frequency output, choose the output depends on many factors, including the distance between transmitter and system controller or display, if there is a "noise" or other electronic jamming signal, if you need the amplifier, the position of the amplifier and so on. For many short the distance between the transmitter and controller of OEM equipment adopts mA output of the transmitter is most economic and effective solution.

If you need to output signal amplification, had better use transducer with built-in amplifier. For long distance transmission or exist strong electronic jamming signals had better use mA output level or frequency output.

If in the environment of the RFI and EMI index is high in addition to notice to choose mA or considering special protection or even outside the frequency output filter.

6, choose what kind of excitation voltage

The type of the output signal decided to choose how excitation voltage. Many pressure transmitter has a built-in voltage adjusting device, so the power supply voltage range is larger. Some transmitter is quantitative configuration, needs a stable working voltage, therefore, working voltage to decide whether to use sensors with regulator, to comprehensively consider transmitter operating voltage and system cost.

7, whether to have the interchangeability of the transmitter

To determine whether the transmitter can adapt to use multiple systems. In general it is very important, especially for OEM products. Once the product to the customer then the customer for the cost of calibration are considerable. If the product has good compatibility, so even if change the transmitter will not affect the effect of the whole system.

8, pressure transmitter, the need to maintain stability after working overtime

Most of the transmitter after the extra work will produce "drift", therefore it is necessary to understand the stability of the transmitter before buying, this work in advance can reduce use will appear in all sorts of trouble in the future.

9, encapsulation of pressure transmitter

Transducer encapsulation, often easy to overlook is its frame, however this will gradually exposed its shortcomings in the later use. Transmitter when the choose and buy must consider the transducer working environment in the future, humidity, how to install the transmitter, will have a strong impact or vibration, etc.

10, between transmitter and other electronic equipment connected by what

Whether to need to take a short connection? If a long connection, whether to need to adopt a connector?