Pressure transmitter how to correctly select - Huaqiang Electronic Network

How to Buy Pressure Transmitters

When purchasing pressure transmitters, users often consider a variety of factors. Choosing the right instrument can significantly reduce future issues and improve system performance. In this guide, I'll walk you through the key steps to make an informed decision when selecting a pressure transmitter.

1. What type of pressure do you need to measure?

The first step is to determine the maximum pressure in your system. It's generally recommended to select a transmitter with a range about 1.5 times higher than the maximum expected value. This helps prevent damage from pressure spikes, which are common in systems like water pressure monitoring. Sustained overpressure or even slight exceedance of the calibrated range can shorten the sensor’s lifespan and reduce accuracy. A pressure buffer can help, but it may slow down the response time. So, always consider the range, accuracy, and stability when choosing your device.

2. What kind of medium will be measured?

Viscous liquids, mud, solvents, or corrosive substances can affect the transmitter’s performance. These materials might clog the pressure interface or damage the components in direct contact with them. Therefore, it's important to choose a transmitter that is compatible with the medium—such as one with a direct barrier or suitable materials for long-term use.

3. What level of accuracy is required?

Accuracy is crucial, and it depends on several factors: nonlinearity, hysteresis, repeatability, temperature effects, zero offset, and more. The higher the accuracy, the more expensive the device. You should evaluate these parameters based on your application needs to avoid overspending on unnecessary precision.

4. What is the operating temperature range?

Transmitters typically have two temperature ranges: the normal operating range and the temperature compensation range. The former indicates the safe working conditions, while the latter ensures consistent performance. If the temperature goes beyond the compensation range, the output may become unreliable. Temperature changes can cause zero drift or full-scale drift, so understanding how the transmitter behaves under different temperatures is essential.

5. What type of output signal is needed?

Common output options include mV, V, mA, frequency, and digital signals. The choice depends on factors like distance between the transmitter and the controller, presence of electrical noise, and whether amplification is required. For short distances, mA output is often cost-effective. For long-distance transmission or high interference environments, mA or frequency outputs are preferable. In such cases, built-in amplifiers or filters may also be necessary.

6. What excitation voltage is required?

The output type determines the excitation voltage requirements. Some transmitters have internal voltage regulators, allowing for a wide supply voltage range. Others require a stable power source. Always check the operating voltage and system compatibility to ensure optimal performance and avoid unnecessary costs.

7. Is interchangeability important?

If you're using the transmitter in multiple systems or OEM applications, interchangeability is key. A compatible transmitter allows for easy replacement without recalibration, saving time and reducing customer costs after delivery.

8. Does the transmitter maintain stability after long operation?

Many transmitters experience “drift” after prolonged use. It’s important to choose a model known for long-term stability to avoid frequent recalibrations and potential failures in the field.

9. What is the package or housing like?

The housing is often overlooked, but it plays a critical role in protecting the transmitter. Consider environmental factors like humidity, vibration, and installation space. A robust housing ensures the transmitter performs reliably in its intended environment.

By following these guidelines, you can make a well-informed choice that ensures accurate, reliable, and long-lasting performance. Choosing the wrong transmitter can lead to measurement errors, system failures, and costly repairs. With the right selection, your pressure transmitter will serve you efficiently for years to come.