Novus NP785: Ultra-Low Differential Pressure Transmitter

Precision Control for Critical Environments

In applications like HVAC, clean rooms, and industrial flow measurement, even the smallest pressure differences can be critical. Accurate monitoring of these ultra-low pressure values is essential for maintaining air quality, ensuring system efficiency, and complying with safety standards. Without a reliable and precise sensor, you risk inaccurate readings, poor process control, and potential operational failures.

The Novus NP785 Ultra-Low Differential Pressure Transmitter is engineered to provide highly accurate and stable measurements in these demanding environments. It is designed to measure minute over-pressure, under-pressure, and differential pressure in neutral, non-corrosive gaseous media. The NP785 offers a wide range of configurable measuring ranges, a temperature-compensated sensor for long-term stability, and flexible output options, making it the ideal solution for sophisticated pressure monitoring.

With its robust design, DIN rail mounting for easy integration, and digital communication capabilities via RS485 Modbus RTU, the NP785 delivers a powerful combination of precision, reliability, and ease of use.

Key Features & Benefits

• Ultra-Low Pressure Measurement: Specialized for measuring very small pressure differences, from as low as $\pm 50\text{ Pa}$ to $\pm 1000\text{ mbar}$, ensuring high sensitivity for critical applications.

• Bidirectional Operation: Capable of measuring both vacuum (under-pressure) and positive (over-pressure) differential pressure from a single device.

• Configurable Measuring Ranges: The range is fully configurable via the free NXperience software (or SigNow app) using a standard USB connection, offering exceptional flexibility and reduced inventory costs.

• Dual Analog Outputs: Features both a 4-20 mA and 0-10 Vdc output, which can be selected and configured to integrate seamlessly into new or existing control systems.

• RS485 Modbus RTU: Includes a standard RS485 port with Modbus RTU protocol, enabling digital communication, networking, and remote data acquisition.

• Temperature Compensated: The internal sensor is temperature-compensated to maintain high accuracy and stability even with fluctuating ambient temperatures.

• Durable & Compact Design: Housed in an ABS/PC enclosure for DIN rail mounting, with a compact size and IP20 protection rating, perfect for industrial control panels.

• Overpressure Resistance: Built to withstand proof and burst pressures significantly higher than its operating range, ensuring durability and preventing damage from pressure spikes.

Technical Specifications

• Product Type: Differential Pressure Transmitter

• Model: NP785

• Media: Neutral, non-corrosive gaseous media

• Measurement Ranges: Configurable (e.g., $\pm 50\text{ Pa}$ to $\pm 1000\text{ mbar}$)

• Accuracy: $\pm 1\%$ of maximum range ($\pm 0.5\%$ upon request)

• Proof Pressure: Varies by model range (e.g., up to $100\text{ mbar}$ for $\pm 5\text{ mbar}$ range)

• Analog Outputs: 4-20 mA (max load $500\Omega$) and 0-10 V (max current $2\text{ mA}$)

• Digital Communication: RS485 with Modbus RTU protocol

• Power Supply: 12-30 Vdc

• Housing: ABS/PC, DIN rail mounting

• Dimensions: $19\times 77.9\times 72\text{ mm}$
  

• Pressure Connections: Two nickel-plated brass fittings for pneumatic hoses (\varnothing 4 \text{ or } 6 \text{ mm} inner diameter)

• Protection Rating: IP20

• Operating Temperature: −5∘C to 65∘C
  

Ideal Applications

The NP785 is a critical component for systems requiring high-precision pressure control and monitoring, including:

• HVAC Systems: Monitoring filter status, ensuring proper air flow, and managing duct pressure in commercial buildings.

• Clean Rooms: Maintaining a positive or negative pressure to prevent contamination in pharmaceutical, semiconductor, and food processing facilities.

• Building Automation: Monitoring pressure in pressurized stairwells for fire safety systems.

• Flow Measurement: Acting as a primary sensor for flow measurement across a differential pressure device.

• Industrial Process Control: Precise pressure monitoring in various industrial gas systems.

Frequently Asked Questions (FAQs)

Q1: What does "ultra-low differential pressure" mean? A1: This refers to the measurement of very small pressure differences between two points. The NP785 is specifically designed to accurately detect these minute changes, which are often found in air and gas applications.

Q2: How do I configure the measuring range of the NP785? A2: The NP785 is easily configured using the free Novus NXperience software or the SigNow mobile app via a USB connection. This allows you to set the specific pressure range and other parameters to match your application.

Q3: What is the difference between the 4-20 mA and 0-10 V outputs? A3: The 4-20 mA output is a current loop, often used for long-distance signal transmission with higher noise immunity. The 0-10 V output is a voltage signal, commonly used for shorter distances and simpler connections to controllers. The NP785 provides both options.

Q4: Can this be used to measure liquid pressure? A4: No, the Novus NP785 is specifically designed for measuring pressure in neutral and non-corrosive gaseous media only. Using it with liquids could damage the sensor.

For more information or to request a quote, please contact our sales team today.