Industrial Pressure Sensors

Support Many Applications and Pressure Ranges with One Sensor

ND Series Product Matrix

ND Series – Pressure Sensors

1 Minute Summary of Benefits

Engineering Design Resources

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Broad Application Support

The ND Series supports the broadest range of applications – some examples:

Manufacturing line

Manufacturing

3D Printing

Air Quality Testing

Automated Safety Systems

Chemical Monitoring

Leak Testing

Nuclear Power Monitoring

Pneumatic System Monitoring

Water Quality Testing

R&D lab 2

R & D

Air Pressure Monitoring

Calibration of Devices

Clean Room Access

Data Acquisition

Environmental Chambers

Lab Equipment

Large Format Printers

Particle Counting

Airplane cockpit

Commercial

Auto Smog Testing

Aviation Instrumentation

Cabin Pressure Monitoring

Commercial Space Rockets

DHS Air Quality

Hospital Room Monitoring

Radon Remediation

UAV/UAS (Drones)

ND Series Superior Technology

Recommended NimbleSense Features

  • Multi-Range
  • Closed Loop Control
  • Advanced Digital Filtering
  • 50/60Hz Notch Filter
Multi-Range

One device can support up to 7 different pressure ranges from 62.5 Pa (0.25” H2O) to 5 PSI (345 mBar) across the ND Series, and each pressure range is factory calibrated and optimized ensuring no degradation in a total error band, accuracy or stability regardless of the range selected. This eliminates the complexity and headaches of working with multiple sensors.


Instead of having to research, purchase and design-in multiple parts, a single Multi-Range part simplifies both the design and manufacturing of a product. Designing in the same part throughout your designs is much more efficient than having to select multiple components. When you design in each of the Superior Sensor differential pressure sensors, the setting of the pressure is done via a single software command. It’s that simple. Add the fact that there is only one product to inventory, and your manufacturing team will also appreciate the value of Multi-Range!

Multi-Range comparison for ND Series

Benefits of Multi-Range Technology include:

  1. Design flexibility with ability to ‘tweak’ pressure range throughout development cycle
  2. Simplified product design with one sensor replacing up to 7 different sensors
  3. Ability to quickly develop product variants at different pressure ranges without changing hardware design
  4. Greater economies of scale by purchasing larger quantities of the same product
  5. Reduced manufacturing complexity and costs due to simplified calibration of sensors
  6. Up to 7x reduction in sensor inventory costs and product obsolescence
  7. Allows manufacturers to build fewer product variants, significantly lowering working capital requirements and inventory
Closed Loop Control

Closed Loop Control adds capabilities to set and maintain flow rates via pressure management by directly controlling motors, valves and actuators. Superior Sensors offers the option to have this capability integrated into the sensor in order to more effectively set and maintain flow rates by directly controlling motors, valves and actuators to maintain flow rate targets.

Basic Closed Loop Control System

The integrated Closed Loop Control design significantly reduces loop delays in the electronic circuit by up to 100x. This integrated solution also eliminates the need to design and implement a complex control loop system, resulting in more efficient, more reliable and less costly products. Closed Loop Control is of extreme value in medical respiratory devices such as ventilators and CPAP, as well as in air quality measurement products.

The figure below shows a block diagram of an implementation of the Superior Sensor Closed Loop Control for an air quality application. In order to effectively measure the air quality, we require maintaining a constant/known airflow through the viewing window. The differential pressure across the venturi directly measures the flow into this viewing window. The system sets a target pressure level across the venturi and the differential pressure sensor automatically increases or decreases the drive to the pump to maintain the targeted differential pressure, ensuring a constant airflow into the viewing window. This is accomplished with the NimbleSense closed loop circuit used in combination with the company’s proprietary noise filtering, resulting in greater than 100x reduction in loop delay.

Closed Loop Control Air Quality Block Diagram

Benefits of the integrated Closed Loop Control include:

  1. Greatly reduce loop delays to improve accuracy and responsiveness of your product
  2. Improve the reliability of your product by eliminating discrete parts
  3. Reduce your overall system costs
  4. Minimize system power and heat
  5. Simplify your product design
  6. Speed your time to market
Advanced Digital Filtering

Superior Sensor’s advanced digital filter is a multi-order filter that utilizes advanced filtering capabilities on the front-end of the sub-system to eliminate critical noise created by fans, blowers or other dry air/gas sources prior to reaching the pressure sensing sub-system. The NimbleSense advanced filtering capability removes sensor induced mechanical noise before it becomes an error signal that can adversely impact overall system performance. In customer deployments where our sensor replaced a competing component, we have seen greater than 10x reduction in sensor induced noise, thus greatly improving the SNR of the sensor output. In very low pressure systems, the improvement is even more significant.

Incorporating both standard and optional digital filters, this feature provides significantly better noise reduction and eliminates the need to design an external filtering system, resulting in more efficient, more reliable and less costly products. Our advanced digital filtering is optimized for each application to ensure mixed sampling noise is kept well below the noise floor. By removing the mechanical noise, we maximize overall system performance.

The example below is of a 4th order FIR filter customized to block pump noise above 50 Hz, which has noise of equal magnitude as the signal of interest. The lower graphs show the resulting impact of the advanced digital filtering.

Advanced Digital Filter - Transfer Function
Advanced Digital Filter - Processing Example

Benefits of the advanced digital filtering technology include:

  1. Greatly reduced system noise levels by 10x or more, especially important in very low pressure applications. For noise prone systems, an improvement of 100x to 1000x is not unreasonable.
  2. Eliminate noise sources such as fans and blowers before they reach the pressure sensing sub-system.
  3. Simplify product design with an integrated approach.
  4. Speed time to market by not having to design an external filtering system.
50/60Hz Notch Filter

As all of Superior’s pressure sensors have an extremely low noise floor, theoretically power line interference can be ‘heard’ when taking measurements. The integrated 50Hz/60Hz notch filter eliminates this noise so you maintain the advantage of having such a low noise floor pressure sensor without any external interference. With the notch filter seamlessly integrated in the differential pressure sensor module, the sensor blocks out the interference caused by these frequencies before it reaches the user application. Further, as the notch filter is internal to the sensor module, it eliminates the need for an engineer to design and implement an external notch filter. This feature removes an external notch filter, so the overall system is more efficient, more reliable and less costly.

Benefits of the integrated 50/60Hz Notch Filter include:

  1. Eliminate the noise from the power grid and AC devices before it reaches the sensing element
  2. Simplify product design with an integrated approach
  3. Speed time to market by not having to design and/or implement an external notch filter
  4. Lower overall system cost as an external notch filter is no longer required

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