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The core of the pressure sensor is usually@1.5mA,with an output of 100mV. However, with the improvement of process technology, the same excitation can achieve a higher output, even exceeding 1V. Therefore, under the condition of meeting overload resistance, an output greater than about 200mV is also normal.
The silicon cup of the gauge pressure sensor experiences anisotropic corrosion, which leads to inconsistent stress directions under positive and negative pressure, resulting in nonlinear asymmetry and increased nonlinearity. At the same time, when under positive pressure, the core is in a suspended state and is not affected by external stress, leading to a more stable output. However, when in a negative pressure state, the suspended state of the core is disrupted, and stress is applied to the diaphragm of the sensor core, making it appear unstable. The solution is to carry out detailed design and processing inside the sensor housing to avoid stress interference under negative pressure.
After compensation and correction, the sensor core is connected into a closed-loop circuit through thick film circuits.4At this point, regardless of zero position error, TCZ, TCSP, etc., all are within the specified range. However, some customers prefer to use a 5-wire configuration, which means disconnecting the sensor from the closed loop to create an open loop. This allows for a large range of migration by changing the bridge arm resistance, but the problems it brings are also evident: it disrupts the resistance balance of the sensor, leading to increased TCZ error, especially noticeable in small range segments. Currently, due to reduced circuit costs, large migrations can be achieved through circuits; therefore, using a 5-wire open loop for testing is not recommended..
The transmitter is installed on-site and is often not removable, or there is no calibration device on-site to make a judgment. At this time, use a multimeter to connect in series with the transmitter and signal line, setting the range to mA. Close the valve; if the output is around 4.00mA, it is considered normal. If the output is less than 3.00mA or greater than 20.00mA, it should be judged as a fault in the sensor probe part. An output greater than 5mA and less than 20mA indicates a circuit fault, while no current also indicates a fault in the circuit board. After identifying the cause of the problem, replace the spare parts and restart the equipment to observe if it operates normally.
SMP2900 and SMP2910 are both differential pressure sensors. Unlike conventional differential pressure sensors that can cost thousands of yuan, they do not have mechanical overload protection inside. To function properly, it is essential to understand the characteristics and parameters of the sensor. Both the positive pressure chamber and the negative pressure chamber can withstand a certain amount of overload, and the selection documentation includes information on the overload multiples corresponding to the measurement range. Making the correct choice can help avoid errors. Additionally, a valve group can be added; during operation, there is often static pressure in the system pipeline. We need to first place the sensor in a static pressure state by opening a bypass valve to allow the medium to flow from high pressure to low pressure, reducing direct contact of the medium with the sensor to prevent impact. Then, we can open the valves on both the high-pressure and low-pressure sides, at which point the sensor can operate normally and stably.
No, the sensors used for food hygiene often require regular disinfection and cleaning. There is still a 0.1mm assembly gap between the inverted sensor and the housing, which can retain deteriorated media, causing secondary contamination. At the same time, inverted sensors cannot withstand high-temperature disinfection, often causing temperature hysteresis errors during normal operation. In negative pressure operation, it can even lead to the sensor being sucked out of the housing. Therefore, it is necessary to use a truly fully welded hygienic pressure sensor, such as SMP2200, SMP2300I, SMP2300II.
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