Pressure Sensor Pressure sensor unavoidable error When choosing a pressure sensor, we should consider his comprehensive precision, and what is the accuracy of the pressure sensor? In fact, there are many factors that cause the sensor error. Below we pay attention to the four unavoidable errors, which are the sensor Initial error. Offset error: Since the vertical displacement of the pressure sensor remains constant over the entire pressure range, variations in transducer diffusion and laser adjustment correction will produce offset errors. Sensitivity error: The magnitude of the error produced is proportional to the pressure. If the sensitivity of the device is higher than the typical value, the sensitivity error will be an increasing function of the pressure. If the sensitivity is lower than the typical value, the sensitivity error will be a decreasing function of the pressure. This error is caused by a change in the diffusion process. Linearity error: This is a factor that has little effect on the initial error of the pressure sensor. The error is due to the physical nonlinearity of the silicon chip, but for the sensor with the amplifier, the nonlinearity of the amplifier should also be included. The linear error curve can be a concave curve or a convex curve load cell . Lag error: In most cases, the hysteresis error of the pressure sensor is completely negligible because the silicon wafer has a high mechanical stiffness. It is generally only necessary to consider the hysteresis error in situations where the pressure varies greatly. These four errors of the pressure sensor are unavoidable. We can only choose high-precision production equipment, use high-tech to reduce these errors, and perform a little error calibration at the factory to minimize the error. Meet the needs of customers. Pressure Sensor Anti-jamming measures of pressure sensors Maintain stability Most sensors produce “drift†after a timeout, so it is important to understand the stability of the sensor before purchasing. This pre-work can reduce the hassle of future use. Pressure sensor package The packaging of the sensor, especially often overlooked is its frame, however this will gradually reveal its shortcomings in later use. In the purchase of the transmitter must take into account the future working environment of the sensor, how the humidity, how to install the sensor, there will be strong impact or vibration. Select output signal What output signals are required for the pressure sensor: mV, V, mA, and frequency output digital output, depending on a variety of factors, including the distance between the sensor and the system controller or display, whether there is "noise" or other electronic interference signals. Whether the amplifier, the position of the amplifier, etc. are required. For many OEM devices with short distances between sensors and controllers, the most economical and effective solution for mA output sensors, if you need to amplify the output signal, it is best to use a sensor with built-in amplification. For long-distance transmission or strong electrical interference signals, it is best to use mA output or frequency output. In environments where RFI or EMI specifications are high, in addition to the need to select mA or frequency output, special protection or filters are also considered. (At present, due to various collection needs, there are many kinds of output signals of pressure sensors on the market, mainly 4-20mA, 0-20mA, 0-10V, 0-5V, etc., but the more commonly used is 4-20mA and 0-10V two kinds, among the output signals I mentioned above, only 2-20mA is two-wire system, we say that the output is several lines without grounding or shielding, the others are three-wire system). Select excitation voltage The type of output signal determines how the excitation voltage is selected. Many amplification sensors have built-in voltage regulation, so their supply voltage range is large. Some transmitters are quantitatively configured and require a stable operating voltage. Therefore, a working voltage that can be obtained determines whether or not to use a sensor with a regulator. When selecting a transmitter, it is necessary to consider the operating voltage and system cost. Need to have interchangeable sensors? Determine if the required sensor can accommodate multiple use systems. Generally speaking, this is very important. Especially for OEM products. Once the product is delivered to the customer, the cost of the customer's calibration is considerable. If the product is interchangeable, even changing the sensor used will not affect the overall system. other After confirming some of the above parameters, we must also confirm the process connection interface of your pressure sensor and the supply voltage of the pressure sensor; if it is used in special occasions, the explosion protection and protection level should also be considered. Pressure Sensor Pressure sensor daily use and maintenance Prevent dross from depositing in the conduit and contact the sensor with corrosive or superheated media. When measuring the gas pressure, the pressure tap should be opened at the top of the process pipe, and the sensor should also be installed in the upper part of the process pipe so that the accumulated liquid can be easily injected into the process pipe. When measuring the pressure of the liquid, the pressure tap should be opened on the side of the process piping to avoid depositing slag. The pressure guiding tube should be installed where the temperature fluctuations are small. When measuring the pressure of the liquid, the installation position of the sensor should avoid the impact of the liquid (water hammer phenomenon) to avoid damage to the sensor overpressure. When freezing occurs in winter, sensors installed outdoors must take anti-freeze measures to prevent the liquid in the pressure-inlet from expanding due to the volume of ice, resulting in loss of the sensor. When wiring, pass the cable through the waterproof joint or the coil and tighten the seal nut to prevent rainwater and the like from leaking into the transmitter housing through the cable. When measuring steam or other high-temperature medium, it is necessary to add a condenser such as a buffer tube (coil), and the operating temperature of the sensor should not exceed the limit. 600W Medical Power Supply,600W Medical Device Power Supply,600W Medical Power Adapter,600W Rade Power Supplies Shenzhen Longxc Power Supply Co., Ltd , https://www.longxcpower.com
Pressure sensor is the most commonly used in industrial practice a sensor, which is widely used in various industrial automation environment, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, power, shipbuilding, Machine tools, pipelines and many other industries, and daily use and maintenance are particularly important, the following small series will give you a detailed introduction.