Pressure sensors are often used in our production process. There are many parameters of the pressure sensor, which parameters should be paid attention to when selecting the pressure sensor, and how to quickly lock the product according to several key parameters? Today we will share with you as following,
In short, seven parameters decide a pressure sensor selection: pressure connection, pressure range, electrical connection, power supply, output signal, medium and accuracy. The sections below explain how each one affects your choice.
1. Pressure connection
The pressure interface, also known as the process connection, is the connecting part of the sensor and the source component. This is usually done by way of thread mounting.
Our sensors are available in many types of connections, including but not limited to: SAE/UNF, BSP, NPT, DIN and metric threads. Both internal and external versions are available. Certain factors may limit the availability of process connections, including material requirements and pressure ranges. It can also be customized according to the specific requirements provided by customers.
2. Pressure range
Pressure range refers to the measurement range, our sensor can provide a measurement range of -0.1 MPa~150 MPa (-14.7 psi~21755 psi), suitable for a variety of fluid measurement, such as: air, water, oil, food, etc.
How to choose a safe pressure range?
Customers need to determine the sensor range according to the actual pressure change interval of the process, the general recommended range is 1.2 to 1.5 times the actual working pressure, it should be noted that to consider the instantaneous pressure at work, that is, the water hammer phenomenon, in the equipment start and stop moment, the valve opening moment, there may be several times or even ten times the peak pressure of the moment, It leads to permanent damage to the sensor, so this situation should be specially marked, and we will provide targeted solutions for the sensor.
3. Electrical connection
Electrical interface, also known as electrical connection, refers to the sensor signal connection to the PLC, DCS, secondary instruments, etc., including direct outlet, M12*1, Packard, Hirschmann and other connection methods, can also meet the customer's customized needs.
Electrical connection in the selection of the site to consider the electrical needs and protection level, outdoor installation will generally recommend more than IP67 protection level, so as to avoid water damage to the sensor.
4. Power supply
Power supply refers to the voltage required by the sensor work, under normal circumstances, the sensor power supply from 3V to 30V can work normally, in this range of the sensor power supply is mainly based on the signal output decision, see the specific parameter table.
5. Output signals
Output signals generally include analog and digital, such as I²C, RS485, 4-20mA, 0-5V, and so on.
4-20 mA vs RS485: which output signal should you choose?
The output type and the back-end receiving device and power consumption requirements and transmission distance are related, such as the voltage output is generally transmitted within 100 meters, the power consumption of I²C is low, but the transmission distance is generally within 10 meters, the current output transmission distance is about 1000 meters, and the transmission distance of RS485 communication can reach 3000 meters.
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Output signal
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Typical transmission distance
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Key point
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Voltage output (0-5V, 0-10V)
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Within 100 meters
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Short distance, simple wiring
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I²C
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Within 10 meters
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Low power consumption
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Current output (4-20mA)
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About 1000 meters
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Long distance, anti-interference
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RS485
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Up to 3000 meters
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Longest distance, digital communication
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6. Medium
Medium refers to what the sensor is used to measure, gas, liquid, steam and other fluids.
According to the temperature range of the medium, the corrosion situation should choose the appropriate liquid material, such as ceramic, 316L, 17-4PH, Hastelloy, titanium and other materials. We recommend suitable materials for your media.
7. Accuracy
The accuracy of a pressure sensor refers to the degree of deviation between its measured results and the true value, usually expressed in the form of a percentage. For example, 0.5%FS (full scale) or ±0.1%FS, which means that within the full scale range, the measurement result of the sensor is not deviated from the true value by more than that percentage.
What accuracy do you need for your application?
When selecting a pressure sensor, the required accuracy needs to be determined according to the requirements of the specific application. For applications requiring higher accuracy, we can also meet, and take appropriate calibration and compensation measures to improve the accuracy of the measurement.
Pressure Sensor Selection FAQ
Q: What parameters should I consider when choosing a pressure sensor?
A: Seven key parameters: pressure connection, pressure range, electrical connection, power supply, output signal, medium and accuracy.
Q: What pressure range should I choose for my application?
A: GAMICOS sensors cover -0.1 MPa to 150 MPa (-14.7 psi to 21755 psi). The general recommended range is 1.2 to 1.5 times the actual working pressure, and instantaneous peaks such as water hammer should also be considered.
Q: Which output signal should I choose, 4-20 mA or RS485?
A: Voltage output is generally transmitted within 100 meters, I²C within 10 meters with low power consumption, current output (4-20 mA) about 1000 meters, and RS485 communication can reach 3000 meters.
Q: What accuracy class do I need for a pressure sensor?
A: Accuracy is usually expressed as a percentage of full scale, for example 0.5%FS or ±0.1%FS. The required accuracy depends on the specific application; higher accuracy is available with calibration and compensation measures.
