SIEMENS QBM3120-1 High Accuracy Air Pressure Sensor 100 Pa

The SIEMENS QBM3120-1 stands as a premier solution for precise air pressure measurement within demanding industrial environments. This high-accuracy air pressure sensor offers exceptional performance, boasting a measurement range of 0 to 100 Pascals (Pa), making it ideal for applications requiring meticulous differential pressure monitoring. Its robust design and advanced sensing technology ensure reliable operation and long-term stability, positioning it as a critical component for HVAC systems, building automation, and process control where airflow management is paramount. Key advantages include its superior accuracy, rapid response time, and seamless integration capabilities with Siemens' vast control system portfolio.

Product Specifications

| Parameter              | Specification                       |

| :--------------------- | :---------------------------------- |

| Model                  | QBM3120-1                           |

| Measurement Range      | 0…100 Pa                            |

| Output Signal          | 0…10 V DC                           |

| Power Supply           | 24 V AC/DC                          |

| Accuracy               | ±1.5 Pa                             |

| Operating Temperature  | -20…+50 °C                          |

| Protection Class       | IP54                                |

| Connection Type        | Screw terminals                     |

| Housing Material       | ABS                                 |

| Response Time          | < 5 s                               |

Core Features & Market Positioning

The SIEMENS QBM3120-1 distinguishes itself through its exceptional accuracy of ±1.5 Pa, a critical factor for applications demanding tight control over airflow, such as in cleanrooms or sensitive laboratory environments. This sensor leverages advanced silicon MEMS technology to deliver stable and reliable readings, even under fluctuating conditions. Its market positioning is firmly established as a high-performance, industrial-grade component, favored by system integrators and facility managers who prioritize precision, durability, and compatibility with established building automation platforms. The sensor’s ability to provide a linear 0-10 V DC output simplifies integration into existing control systems, offering a significant competitive advantage over less sophisticated sensors.

Key Application Scenarios

This high-accuracy air pressure sensor is extensively deployed in Building Automation and Control Systems (BACS) for monitoring and controlling ventilation and air conditioning systems. Specific applications include maintaining precise differential pressures in operating theaters, pharmaceutical cleanrooms, and semiconductor manufacturing facilities to prevent cross-contamination and ensure product integrity. It is also crucial for monitoring filter status in air handling units (AHUs), triggering alarms or maintenance requests when pressure drops indicate clogged filters, thereby optimizing system efficiency and air quality. Furthermore, its utility extends to demand-controlled ventilation systems, where it senses room occupancy or air quality parameters to adjust airflow, conserving energy without compromising comfort or safety.

Practical System Integration Guidance

Integrating the SIEMENS QBM3120-1 into a control system is straightforward due to its standard 0-10 V DC output signal and 24 V AC/DC power requirement. For installation, ensure the sensor is mounted in a location representative of the area where pressure is to be monitored, avoiding direct drafts or heat sources that could affect readings. Connect the power supply to terminals 1 and 2 (24V AC/DC) and the output signal to terminals 3 (signal+) and 4 (signal-). Ensure proper grounding for optimal performance. When connecting to a Siemens Desigo CC or similar BACS, the 0-10 V input can be directly wired to a digital input module, and the signal scaled within the software to represent the 0-100 Pa range, typically with a zero-point adjustment to compensate for any minor offsets.

Operation and Risk Mitigation

Proper operation of the SIEMENS QBM3120-1 hinges on understanding its environmental operating limits and ensuring its physical integrity. Avoid exposing the sensor to pressures outside its specified range (0-100 Pa) or to corrosive media, as this can lead to permanent damage and inaccurate readings. During maintenance or cleaning, ensure power is disconnected to prevent electrical hazards. While the QBM3120-1 is designed for robust operation, common issues can arise from blocked sensor ports due to dust or debris, which can impede airflow and cause erroneous low-pressure readings. Regularly inspect and, if necessary, gently clean the pressure ports using compressed air or a soft brush to maintain accurate performance.

Scalability & Long-Term Value

The SIEMENS QBM3120-1 offers significant long-term value through its seamless integration with Siemens' extensive range of automation and control hardware and software, including platforms like Desigo. This inherent compatibility ensures scalability, allowing for easy expansion of monitoring and control capabilities across an entire facility or portfolio of buildings. Its robust design and high-quality components contribute to a long operational lifespan, minimizing the total cost of ownership. Furthermore, as industries move towards enhanced digitalization and the Industrial Internet of Things (IIoT), the QBM3120-1 can be readily incorporated into networked systems, feeding critical pressure data into supervisory control software for advanced analytics, predictive maintenance, and optimized energy management.

Frequently Asked Questions

What is the primary application for the SIEMENS QBM3120-1 sensor?

The SIEMENS QBM3120-1 is primarily used for precise differential air pressure monitoring in HVAC systems and cleanroom environments. It ensures optimal airflow for critical processes.

This sensor is vital for maintaining air quality and preventing contamination in sensitive areas like laboratories and pharmaceutical manufacturing. Its accurate readings are essential for regulatory compliance.

It also plays a key role in energy efficiency by enabling demand-controlled ventilation, adjusting airflow based on real-time needs and occupancy levels.

How do I calibrate the SIEMENS QBM3120-1 sensor?

Calibration typically involves setting the zero point in a zero-pressure environment. This ensures accurate baseline readings.

The sensor can be adjusted within the building automation system software to match the desired pressure range and output signal.

For high-precision applications, periodic recalibration against a certified reference standard may be recommended by the system integrator.

What are the typical wiring connections for the SIEMENS QBM3120-1?

Connect the 24V AC/DC power supply to terminals 1 and 2 on the sensor. Ensure correct polarity if using DC.

The 0-10 V DC output signal is wired to terminals 3 (signal+) and 4 (signal-).

Proper grounding is crucial for signal integrity and protection against electrical noise interference.

What is the accuracy of the SIEMENS QBM3120-1?

The SIEMENS QBM3120-1 offers a high accuracy of ±1.5 Pascals (Pa) within its operating range.

This precise measurement capability is critical for applications demanding strict environmental control and airflow management.

Its accuracy ensures reliable performance for sensitive processes where even minor pressure deviations matter.

What is the pressure range of the SIEMENS QBM3120-1?

This sensor is designed to measure air pressure in the range of 0 to 100 Pascals (Pa).

This specific range makes it ideal for low-differential pressure applications commonly found in HVAC and cleanroom environments.

It accurately detects subtle pressure changes crucial for maintaining airflow balance and preventing leaks.

Can the SIEMENS QBM3120-1 be used outdoors?

The QBM3120-1 has an IP54 protection rating, meaning it offers protection against dust and splashing water.

While it can withstand some environmental exposure, direct prolonged immersion or harsh weather conditions are not recommended.

For outdoor installations, additional protective enclosures or selection of sensors with higher ingress protection ratings may be necessary.

What output signal does the SIEMENS QBM3120-1 provide?

The sensor outputs a linear 0-10 V DC signal proportional to the measured air pressure.

This standard analog output makes it compatible with a wide array of building automation controllers and data acquisition systems.

The signal can be easily scaled in the control system software to represent the actual pressure in Pascals.

What are the power requirements for the SIEMENS QBM3120-1?

The SIEMENS QBM3120-1 operates on a 24 Volt AC or DC power supply.

This is a common voltage used in building automation and industrial control systems, simplifying integration.

Ensure the power supply is stable and within the specified tolerance to maintain sensor accuracy and longevity.

How does the SIEMENS QBM3120-1 detect clogged filters?

A clogged filter causes increased resistance to airflow, leading to a drop in differential pressure across the filter.

The QBM3120-1 accurately measures this pressure drop, and when it exceeds a predefined threshold, it signals a clogged filter condition.

This proactive monitoring allows for timely filter replacement, optimizing system performance and air quality.

What is the response time of the SIEMENS QBM3120-1?

The SIEMENS QBM3120-1 has a response time of less than 5 seconds.

This rapid response ensures that the control system can react quickly to changes in air pressure.

A fast response time is critical for maintaining stable conditions in dynamic environments like cleanrooms.