Leading Differential Sensor Technology
Differential Pressure Transducers
Differential pressure transducers measure the difference in pressure between two points, typically referred to as P1 and P2 or high side and low side. This type of sensor can be used to monitor level in a sealed tank, cleanliness of a filter, or flow across an orifice. Differential pressure transducers can be packaged in miniature OEM designs or rugged industrial packages. Our DP sensors can also be calibrated as unidirectional or bidirectional depending on the customer’s application. DP’s are available in industrial and hazardous location approved configurations. Core Sensors offers standard differential pressure transducers with analog voltage and current output signals. Additionally, Core Sensors will create custom differential pressure sensors and transducers to your needs.
Differential Pressure Transducer Application Notes
By using a differential pressure sensor or transducer, an operator can confidently know when a filter change is required by monitoring the output signal.
Learn about various level applications that utilize sensors as well as the various installation methods available.
Class I Division 2 differential pressure transducers are commonly used to monitor gas pressure such as R290 in refrigerator compressors.
Core Sensors offers low power DP transducers that can operate off of an unregulated supply of 3-5VDC, ideal for remote battery and solar applications.
Frequently Asked Questions
What is a wet/wet differential pressure transducer?
A wet/wet differential pressure transducer is a type of differential pressure transducer that can measure the pressure of liquids and gases. This differs from a dry/dry transducer, which is limited to pneumatic applications. Even in certain gas applications, moisture can build up within the system to limit the survivability of the sensor. Wet/wet differential pressure transducers provide greater compatibility and survivability.
What is bi-directional measurement?
In a bi-directional differential pressure transducer, the output signal midpoint is set to 0 PSID and the measurement range is equal on either side of the mid-point. For example, a bi-directional differential pressure transducer can have a +/- 5PSID measurement range with a 4-20mA output signal. -5 PSID would be set to 4mA, 0 PSID would be 12mA, and +5 PSID would be 20mA. This is common for applications that have bi-drectional flow of liquids or gases or when a system incurs a vacuum pressure that requires the measurement to be read to ensure the system has been fully evacuated.
How do differential pressure transducers work?
A differential pressure transducer has two hermetically sealed chambers, each connected to a process, separated by a flexible membrane with a glued-on resistance bridge. The membrane tilts towards the chamber with the lower pressure, and this deflection is converted into an electrical signal proportional to the pressure difference.
What are the common applications of differential pressure transducers?
Differential pressure transducers are commonly used in:
- Filter monitoring to detect clogging or blockages.
- Level measurement in closed containers.
- Flow rate measurement by calculating the pressure drop across a primary element like an orifice plate, venturi, or flow nozzle.
- Safety-critical systems to monitor pressure differences that could indicate potential hazards.
Can differential pressure be measured using two separate absolute pressure sensors?
Yes, differential pressure can be measured using two separate absolute pressure sensors. The difference in pressure is calculated by the control system or internal electronics of the sensors. This method is useful when different types of sensors are required for different mediums or environments, but sacrifices resolution and accuracy.
What are the key components of a differential pressure transducer or transmitter?
A differential pressure transmitter typically consists of:
- A pressure-sensing element (often a diaphragm with a strain gauge, differential capacitance, or vibrating wire sensor). Core Sensors employs two stainless steel diaphragms within the same sensing element to measure differential pressure between both sides.
- Two pressure ports labeled as “High” and “Low”.
- Electronics housed separately to process the signal. Core Sensors uses the specialized ASIC technology to calibrate the output signal specific to the sensor’s operation over pressure and temperature.
What are the common output signals of differential pressure transducers?
The output signals from industrial differential pressure transducers are typically 4-20mA or voltage outputs. 4-20mA DP transmitters are simple two-wire, loop powered units which can transmit long distances. Voltage outputs typically have shorter distances, yet offer greater flexibility for low power/current consumption applications such as remote telemetry.
How do differential pressure transducers differ from gauge and absolute pressure sensors?
Differential pressure sensors measure the difference between two points, independent of atmospheric pressure. Gauge pressure sensors are referenced to barometric pressure, while absolute pressure sensors are referenced to a full vacuum.
What are the advantages of using differential pressure transducers?
Differential pressure transducers offer several advantages, including:
- High accuracy and stability.
- Independence from atmospheric pressure changes.
- Suitability for various applications such as flow, level, and filter monitoring.
- Ability to perform well in applications susceptible to over-pressurization
What is the difference between the CS54 and CS84 differential pressure transducers?
CS54 differential pressure transducers offer a Class I Division 2 non-incendive rating versus the CS84 DP featuring a Class I Division 1 explosion-proof rating. Review your electrical code and design requirements to ensure the most suitable series is selected.
Are custom differential pressure transducers available?
For OEM applications, Core can customize our differential sensor platform to meet your needs. From process connections and electrical connections to materials and outputs, Core will partner with you to design and manufacture the right product. Note that for hazardous area rated products, the level of customization can be extended based on additional testing requirements and resubmission to approval agencies.
How can I mount or install differential pressure transducers?
The Core Sensors standard product line of differential pressure transducers feature mounting holes at the base of the rectangular transducer body. The mounting holes feature M4x0.7 5mm deep threaded holes and a 1mm diameter V center punch for alignment. The holes are 28mm apart the width; 22mm apart the length of the body.
In many cases, our differential pressure transducers are light enough to be suspended by the piping installation itself.
Connect With Our Team
Have questions? Need a quote? Is there something similar you need that you couldn’t find? We are ready to help! Fill out the form and a member of our team will contact you to discuss your differential pressure transducer requirements. You can also give us a call at (862) 245-2673.
