What is the difference between a pressure transmitter and a pressure gauge?

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What is the difference between a pressure transmitter and a pressure gauge? What is the difference between a pressure transmitter and a pressure gauge? To answer this question, we first need to understand what a pressure transmitter is and what a pressure gauge is. Only by understanding these two devices can we naturally comprehend their differences. What is a pressure transmitter? A pressure transmitter consists mainly of three components: a pressure-sensing element sensor (also known as a pressure sensor), a measurement circuit, and process connections. It can convert the physical pressure parameters of gases, liquids, etc., detected by the pressure-sensing element, into standard electrical signals (such as 4–20 mA DC), which are then supplied to secondary instruments such as indicator alarms, recorders, and regulators for measurement, indication, and process control. What is a pressure gauge? A pressure gauge (English name: pressure gauge) is an instrument that uses an elastic element as a sensing element to measure and indicate pressures higher than the ambient pressure. Pressure gauges are extremely widely used, found in almost all industrial processes and research fields. It can be found everywhere in areas such as thermal piping networks, oil and gas transmission systems, water and gas supply systems, and vehicle repair shops. Especially in industrial process control and technical measurement, mechanical pressure gauges are being used more and more widely due to the high mechanical strength of their elastic sensing elements as well as the convenience of their production. 　 Now that we understand pressure transmitters and pressure gauges, do you know the differences between them? The differences between pressure transmitters and pressure gauges are as follows: 1. The precision of the standard instruments required for calibrating pressure transmitters is much higher than that required for calibrating pressure gauges. 　　2. A pressure gauge only needs to have its input-output relationship calibrated, while a pressure transmitter may require calibration of the relationship between its input and communication data. 　　3. Calibration of pressure gauges requires corresponding metrological qualifications; such qualifications are generally not required for pressure transmitters, except in cases involving the manufacturer or new construction projects. 　　4. The pressure gauge has poor accuracy and no output; it cannot be operated using a hand controller. Generally, it is calibrated at 5 points, and the differences between readings vary. Intelligent pressure transmitters generally only require calibration at zero and full scale. 　　5. The pressure gauge provides a scale indication as well as its own display function. The pressure transmitter provides a current output, and it must be connected to an ammeter of the appropriate accuracy class for display. From the above description, it is clear that under the same operating conditions, the pressure values measured by pressure transmitters are more accurate, and their potential for future functional expansion is much greater compared to pressure gauges.