Differences Between Pressure Transducer and Pressure Transmitter

While these devices serve similar purposes, subtle differences between them are crucial to understand. This blog post explores what distinguishes pressure transducers from transmitters, their applications, and how to choose the right device for your needs.

What Are Pressure Transducers and Pressure Transmitters?

Pressure Transducers

A pressure transducer (such as the 985 differential pressure transducer) measures pressure and converts it into an analogue electrical signal, typically expressed in millivolts per volt (mV/V). These devices use a pressure-sensitive element, such as a diaphragm, which deforms under pressure. This deformation is then converted into an electrical signal.

Pressure Transmitters

A pressure transmitter (like the 988 differential pressure transmitter) also converts pressure readings into an electronic signal. However, a transmitter goes a step further by modifying, compensating, and amplifying the signal from a transducer to a remote receiver, such as a programmable logic controller (PLC). This enables operators to monitor pressure levels and make necessary adjustments.

Key Differences Between Pressure Transmitters and Transducers

While the terms are often used interchangeably, there are key differences:

• Output Signal: Pressure transducers typically provide a non-amplified voltage output, while pressure transmitters offer an amplified signal, usually in voltage or current (e.g., 4-20mA).
• Power Consumption: Transducers generally require less energy and have lower power consumption, making them suitable for battery-powered applications.
• Signal Processing: Transmitters include additional circuitry for temperature compensation and amplification.
• Noise Immunity: Current output from transmitters is more resistant to electrical interference, especially over longer distances.
• Calibration: Many transmitters offer various calibration options, including turndown and zero/span adjustments.

Advantages and Applications

Advantages of Pressure Transducers

• Accurate and stable
• Easy to maintain
• Cost-effective
• Fast response time

Common Applications of Pressure Transducers

• Monitoring water pressure in pumps and pipework
• HVAC systems
• Refrigeration systems
• Brake and fuel pressure in vehicles
• Gas and liquid level measurement in medical devices
• Robotics and automation
• Environments where pressure fluctuations are common

Advantages of Pressure Transmitters

• Efficient and reliable
• Can withstand a wide range of environments
• Can be connected to other systems
• Capable of measuring pressure relative to atmospheric pressure

Common Applications of Pressure Transmitters

• Oil and gas production
• Hydraulic equipment control
• Chemical processing
• Water and wastewater treatment
• Pump control monitoring
• HVAC systems

Choosing Between a Pressure Transducer and a Pressure Transmitter

When selecting a pressure measurement device, consider the following factors:

• Assess the specific needs of your application.
• Determine whether you need a simple voltage output (transducer) or an amplified, processed signal (transmitter).
• Consider power constraints, especially for battery-operated or remote installations.
• Ensure the chosen device is compatible with your existing control systems or data acquisition equipment.
• Consider temperature range, vibration, and other environmental conditions that may affect the device’s performance.

Can pressure transducers and transmitters be used interchangeably?

While they serve similar purposes, they are not always interchangeable due to differences in output signal and power requirements. Always consult the specifications and system requirements before making a selection.

Are pressure transmitters more accurate than transducers?

Accuracy depends on the specific model and technology used. Both types can offer high accuracy, but transmitters may provide better stability over varying conditions due to their additional signal processing.

Expert Support for Your Pressure Measurement Needs

At Applications Engineering, we understand the complexities of selecting the right pressure control monitoring device for your application. Our extensive range of high-quality mechanical switches and differential pressure sensors includes both transducers and transmitters, suitable for a wide variety of industries and applications.

With our ISO 9001-certified management system, we ensure the highest standards of product quality and service. Our team of experienced professionals is ready to provide expert advice and support to help you choose the perfect solution for your pressure measurement requirements.

Don’t let the complexity of pressure measurement devices overwhelm you. Contact the friendly experts at Applications Engineering today, and let our industry knowledge and extensive product range work for you.