SS316 Resonant Pressure Transmitter with High Resolution and Stability

1. Why You Need a Resonant Pressure Transmitter

Ordinary pressure sensors output an analog voltage that drifts as the electronics age and temperature changes. A resonant pressure transmitter works differently: it measures pressure by detecting a change in the resonant frequency of a vibrating element, and because frequency is a fundamentally stable physical quantity, the measurement is inherently immune to the analog drift that plagues conventional sensors. For trade measurement, critical control and applications demanding long-term stability, this frequency-based principle provides a level of reliability that analog sensors cannot match.

2. Working Principle of the Resonant Pressure Transmitter

The transmitter converts measured pressure into an electrical signal by measuring the deformation of a sensing element under force — specifically, by tracking the resonant frequency of a vibrating element that shifts as pressure deforms it. Since the output is a frequency (the reciprocal of time) rather than an analog voltage, it is highly resistant to drift from temperature and component aging. The SS316 diaphragm provides corrosion resistance, and the frequency signal is converted to a standard output for the control system.

3. Resonant Design Advantages

• High resolution: frequency-based sensing resolves minute pressure changes.
• Long-term stability: frequency output is immune to analog-component drift.
• Corrosion resistance: SS316 diaphragm for industrial gas and liquid.
• Wide temperature range: -40 to 85 °C operating range.
• Certified quality: CE and RoHS certifications.

Common Measurement Challenges & Solutions

Why Choose Our Resonant Pressure Transmitter?

• Frequency-based sensing for inherent long-term stability
• High resolution for fine pressure measurement
• SS316 diaphragm for corrosion resistance
• 0.5% FS precision for reliable process data
• Wide -40 to 85 °C operating temperature range
• 1/2 inch NPT process connection
• M12 electrical connector for quick wiring
• Optional LCD display for local readout
• CE and RoHS certified
• Measures gas and liquid media

Q: What is a resonant pressure transmitter?

A resonant pressure transmitter measures pressure by detecting changes in the resonant frequency of a vibrating sensing element. As pressure deforms the element, its natural resonant frequency shifts, and this frequency change is measured and converted into a pressure reading. Because frequency is a fundamentally stable physical quantity — the reciprocal of time — the measurement is inherently resistant to the analog drift and noise that affect voltage-based sensors, giving the instrument excellent long-term stability and resolution.

Q: Why is frequency-based measurement more stable?

Frequency is derived from time, which can be measured with extreme precision and stability, unlike analog voltages that drift with temperature and component aging. Because the resonant transmitter's output is a frequency rather than an analog signal, it is largely immune to the drift mechanisms that cause conventional sensors to lose accuracy over time. This makes resonant transmitters ideal for applications requiring stable measurement over long periods without frequent recalibration.

Q: What is the accuracy of this transmitter?

This model is specified at 0.5% FS precision, providing dependable accuracy for industrial process measurement. While resonant technology can achieve higher accuracies in specialized instruments, this product balances the frequency-based stability and high resolution of resonant sensing with a practical industrial accuracy level. The SS316 diaphragm and wide temperature range ensure that the specified precision is maintained across real operating conditions.

Q: What does high resolution mean in pressure measurement?

High resolution means the transmitter can detect and display very small changes in pressure. Frequency-based resonant sensing naturally provides fine resolution because small pressure changes produce measurable frequency shifts. This allows the transmitter to capture subtle pressure variations that coarse analog sensors would miss, which is valuable in applications such as fine process control, leak detection and test-stand measurement.

Q: What materials are used?

The diaphragm is made of SS316 stainless steel, which provides good corrosion resistance for gas and liquid media in industrial applications. SS316 is a molybdenum-bearing austenitic stainless steel with better corrosion resistance than 304 in chloride and chemical environments. For highly corrosive media, a diaphragm seal or alternative material may be required, so media compatibility should be confirmed for the specific application.

Q: What is the operating temperature range?

The transmitter operates over a -40 to 85 °C range, covering most industrial and outdoor environments, from cold climates to warm process areas. The wide range means the instrument maintains its measurement performance across seasonal and process temperature variations, which is important for field installations and applications where ambient temperature is not controlled.

Q: What process connection does it use?

The transmitter uses a 1/2 inch NPT process connection, a standard threaded fitting widely used in industrial pressure instrumentation. NPT (National Pipe Thread) provides a reliable, leak-resistant seal for pressure connections. The electrical connection uses an M12 connector for quick, secure wiring to the control system. These standard connections simplify installation and replacement.

Q: Does it have a local display?

An optional LCD display is available for local readout of the measured pressure at the transmitter. This is useful for commissioning, on-site verification and troubleshooting without a separate indicator. The display complements the standard output signal, and operators can choose the display option based on whether local readout is needed at the installation point.

Q: What certifications does it have?

The transmitter is CE and RoHS certified. CE marking indicates compliance with relevant European health, safety and environmental requirements, while RoHS certification confirms the product is free of restricted hazardous substances. These certifications are important for export to European and other regulated markets and demonstrate the product meets recognized quality and environmental standards.

Q: Where are resonant pressure transmitters used?

Resonant pressure transmitters are used in applications requiring high resolution and long-term stability: calibration and metrology reference standards, oil and gas pipeline monitoring, chemical process pressure measurement, aerospace and test-stand applications, and any installation where analog drift would be problematic. Their frequency-based sensing makes them the preferred choice when measurement stability over time is a primary requirement.