The micro differential pressure transmitter is suitable for measuring the pressure or differential pressure below 1000Pa. The problem of micro differential pressure zero drift will give unacceptable errors to the measurement. In this paper, we analyze the key influencing factors of micro differential pressure transmitter zero drift, find the methods and rectification measures to solve the micro differential pressure transmitter zero drift, and ensure the measurement accuracy of micro differential pressure transmitter. Lefoo can has types of differential pressure transmitters, such as low differential pressure transducer ,LFM11 series differential pressure transmitter and air differential pressure transmitter.
1. What is the zero drift of micro differential pressure transmitter?
Zero drift of micro differential pressure transmitter refers to the phenomenon that the output changes with time when the input and ambient temperature of micro differential pressure transmitter remain unchanged. It is caused by the change of its internal temperature, and the internal current and voltage fluctuation of the sensor leads to the instability of the performance of a certain link. Zero drift is an index reflecting the stability of micro differential pressure transmitter.
The processes and components of pressure transmitters produced by different pressure transmitter manufacturers are different, and the temperature zero drift coefficient is also different, which is directly related to the ambient temperature of micro differential pressure transmitter.
2. Factors leading to zero drift of micro differential pressure transmitter
The pressure transmitter with good stability has three conditions: the zero-point change of the pressure transmitter caused by static pressure is very small or almost no, the zero-point change of the pressure transmitter caused by unidirectional overpressure is very small, and the zero-point change of the pressure transmitter caused by temperature and humidity is very small. The stability of the micro differential pressure transmitter is also reflected by the zero-point drift.
The zero drift of micro differential pressure transmitter caused by devices and processes in the manufacturing process cannot be changed by the user, so it is ignored here. For the micro differential pressure transmitter installed on the use site, the zero drift caused by the change of site ambient temperature, installation mode, vibration and power supply voltage is the concern of instrument technicians. The technical scheme and rectification measures to solve the zero drift of micro differential pressure transmitter are also formulated based on these factors.
In order to obtain some data on the influence of temperature change, installation mode, vibration and power supply voltage change on the zero drift of micro differential pressure transmitter, so as to find solutions to the existing problems, four new micro differential pressure transmitters are tested and the test data are obtained.
The four micro differential pressure transmitters used as test samples were all powered on at constant room temperature (25℃, the change of no more than 1℃ every 10min; relative humidity: 7%) for 30 minutes, and then the zero point and range were calibrated to fully meet the product accuracy requirements before testing.
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