DIFFERENTIAL PRESSURE TRANSMITTER
Our silicone-type differential pressure transmitter is designed for accurate and stable differential pressure measurement across a wide range of industrial applications. Using advanced silicon piezoresistive sensing technology, it delivers reliable performance for flow measurement, tank level monitoring, filter monitoring and process control.
Overview
This transmitter uses a silicon piezoresistive sensing element to measure pressure difference with high sensitivity and repeatability. It converts differential pressure into a standard electrical output and is suitable for demanding industrial environments where accuracy, durability and fast response are important.
Sensing Principle
The sensing element is based on the piezoresistive effect in a silicon diaphragm sensor. When differential pressure is applied, the silicon chip deforms slightly, changing its electrical resistance. This change is then converted into a measurable electrical signal proportional to the pressure difference.
How It Works
- Silicon diaphragm sensor based on the piezoresistive effect
- Pressure difference deforms the silicon chip
- Electrical resistance changes with deformation
- The change is converted into an output signal
Construction
The core sensing element is a micromachined silicon chip. It is typically isolated from the process fluid by a stainless steel diaphragm and silicone oil, which transmits pressure to the sensor. The transmitter includes two pressure ports: a high-pressure port and a low-pressure port.
Key Components
- Micromachined silicon chip
- Stainless steel diaphragm
- Silicone oil fill
- High-pressure (HP) port
- Low-pressure (LP) port
Output Signal
The transmitter converts pressure difference into a standard 4–20 mA output signal and supports digital HART communication. The output is proportional to the measured differential pressure, making it suitable for integration into modern process control systems.
Accuracy and Sensitivity
Thanks to the properties of silicon, this transmitter offers very high sensitivity and is especially suitable for low differential pressure measurements such as tank level and pipe flow applications. It also provides high accuracy and repeatability when compared with capacitive and mechanical measurement techniques.
Temperature Compensation
Conventional silicon sensors can be sensitive to temperature changes, but this design uses built-in compensation circuits to correct measurement errors caused by temperature variation. This improves stability and helps maintain performance in changing operating conditions.
Applications
This transmitter is suitable for a wide range of industrial uses, including:
- Flow measurement with obstructive elements such as orifice plates, venturi tubes and nozzle tubes
- Tank level measurement for liquids
- Filter monitoring
- HVAC systems
- Process control
Key Advantages
- Ultra-high accuracy and stability
- High durability
- Resistance against highly corrosive acid and base
- Compact and lightweight design
- Fast response time
- Suitable for low-pressure ranges
- Improved overpressure capability compared with conventional DP transmitters
Protective Coating Benefits
A special coating is used in the DP cell design to improve durability and corrosion resistance of the stainless steel wetted parts. Combined with smart signal conditioning and thermal drift compensation, this helps improve overall performance.
- Added barrier protection against moisture, oxygen and chemicals
- Improved resistance in acidic and marine environments
- Better wear, scratch and impact resistance
- Improved thermal and chemical stability
- Reduced fouling and easier cleaning
- Electrical insulation benefits, helping reduce galvanic corrosion effects
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