In pneumatic applications, heavy duty pressure sensors can be used to measure and control the pressure of high pressure compressed air and gas. At the heart of pneumatic applications is an air compressor that provides compressed air to drive pneumatic equipment or tools. In air compressors, pressure sensors convert measured compressed air pressure into digital or analog electronic signals for precise control in manufacturing, construction, chemical, pneumatic tools, oil and gas, food and beverage industries, and medical device applications. Pressure measurement for heavy duty applications typically ranges from 100 to 1000 PSI. In industrial air compressors, heavy duty pressure sensors can be used to measure and control inlet and outlet pressures, filter pressure drops, cooling water inlet and outlet pressures, and compressor oil pressure. Sensors play a key role in maintaining the performance and efficiency of the compressor. For example, the Honeywell PX2 pressure sensor measures the air pressure in the air reservoir. (As shown in Figure 1). The air pressure in the air tank is used to control the start and stop of the compressor. The air compressor shown in Figure 1 is suitable for a variety of industrial applications, including the use of compressed air in PET bottles for blow molding of plastic bottles, as well as pneumatic tools such as air hammers, air nail guns and hand drills.
Figure 1 heading: Consistent with the application of compressed air in industrial systems - when the tank pressure drops, the start air compressor is triggered; the compressor will continue to run until the air pressure reaches the preset value.
Sensors are typically used for two pressure measurements: (1) determining if the amount of compressed air output to the equipment is appropriate; and (2) monitoring air pressure leaks for maintenance of the pressure line. In order to achieve and maintain better compressor performance, the choice of sensors should be based primarily on reliability and pressure measurement accuracy. When selecting a heavy duty pressure sensor, there are a number of key performance specifications to consider, including total error tolerance (TEB), configurability, and durability. In addition, there are other important parameters to consider, including calibration, zero output, and wide pressure range. All of the above factors can affect product performance, time to market, and overall customer application costs.
Sensor selection criteria should meet all of the requirements for system consistency and reliability. When selecting a pneumatic air compressor application, the design engineer needs to consider the following four points:
Accuracy and consistency: The total error margin is the most important technical parameter when selecting a sensor. The total error range contains all possible errors of the sensor, indicating the true accuracy of the device over the compensated temperature range (eg -40 ° C to 125 ° C). For example, a total error range of ±2% is expressed over the operating temperature range, regardless of whether the pressure is rising or falling, and the sensor error is no more than 2% of the range. Understanding the total error range is critical to ensure that the sensor is accurately used over the pressure range and operating temperature range to provide consistent, reliable and repeatable air pressure readings. The advantage of this feature is that because the difference in accuracy between the sensors is minimal, the interchangeability of the sensor is good; the sensor does not have to be tested and calibrated; it helps to ensure system accuracy. The above advantages are critical to the quality control of the end product.
In particular, some sensor manufacturers do not provide a total margin of error in the product data sheet. In many cases, they only provide accuracy errors (pressure nonlinearity, hysteresis, and non-repetition) that are only part of the total error range (see Figure 2). It is therefore difficult to compare and evaluate sensors produced by different manufacturers.
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