When selecting a differential pressure transmitter, users pay great attention to the accuracy of the differential pressure transmitter itself. In fact, during the field use and installation of differential pressure transmitters, there are also many factors that affect their measurement accuracy. Today, we will take you to understand what factors affect the measurement accuracy of differential pressure transmitters. Range ratio of differential pressure transmitter: First, what is the range ratio of a differential pressure transmitter, which refers to the ratio of the maximum to minimum value that the transmitter can measure when it meets the accuracy requirements. In general, the larger the turndown ratio, the lower the measurement accuracy. The span ratio of the differential pressure transmitter is within the range of 10:1 to ensure the accuracy of the differential pressure transmitter itself. Temperature of differential pressure transmitter: When the differential pressure transmitter is used, the process temperature and ambient temperature have a big difference, and the influence of temperature on the differential pressure transmitter is very small when it is close to the maximum range (i.e. small range ratio), but it has a great impact when it is close to the minimum range (i.e. large range ratio), and sometimes even beyond our imagination. It should be used in strict accordance with the technical instructions of the product. Static pressure of differential pressure transmitters: Similar to the influence of temperature and span ratio, static pressure also has a substantial effect on the zero point and span accuracy of differential pressure transmitters. Such as capacitive differential pressure transmitter, this kind of transmitter in the production process system operation, almost will be affected by static pressure, when the static pressure of the operating condition exceeds a certain value, the static pressure affected error will exceed the accuracy of the transmitter itself, the measurement channel accuracy calculation, if the static pressure influence error, may not meet the accuracy requirements, so the capacitive differential pressure transmitter calibration must be corrected when the static pressure effect. Mounting angle of differential pressure transmitter: The installation angle of the differential pressure transmitter here refers to the angle between the axis of the transmitter and the plumb line when the differential pressure transmitter is installed on site. When the differential pressure transmitter is measuring, the detection element senses the pressure difference between the two sides by measuring the deformation displacement of the diaphragm through the detection center. Since the central measuring chamber is filled with filled silicone oil, when the differential pressure transmitter is tilted perpendicular to the plane of the measuring diaphragm, the filling silicone oil itself will produce pressure on the measuring diaphragm, causing the diaphragm to deform, resulting in a change in the output value. When the differential pressure transmitter is tilted forward and backward, its output linearity and output value change are not obvious, which will not affect its normal use; When the differential pressure transmitter is tilted left or right, its output value will drift in one direction according to the tilt angle, the larger the angle, the greater the impact, but the linearity will not change significantly. Difference between measuring point and installation height of differential pressure transmitters: Due to the needs of the overall design of the site working conditions, the differential pressure transmitter can often not be installed near the measurement point of the use site, but through the impulse tube to a more concentrated place, in order to facilitate maintenance and management, which will cause a height difference between the measurement point and the installation point, the pressure transfer medium in the impulse tube will generate additional pressure due to the height difference, thereby affecting and causing additional errors. In process industry applications, even small height differences introduce large additional errors due to the often high density of the medium. All of these factors will have an impact on the final measurement accuracy of the differential pressure transmitter. We should pay attention to the investigation when using it on site, avoid improper operation, and finally ensure the normal use and accurate measurement of the differential pressure transmitter. Product consultation, product customization, agent, technical inquiry, quotation, etc. If you have any questions, please contact Xingyi: 400-600-4496!