SIEMENS QAE2121.010 Temperature Sensor High Accuracy 1.0m

The SIEMENS QAE2121.010 is a high-accuracy temperature sensor engineered for demanding HVAC and building automation systems. This NTC thermistor sensor excels in providing precise temperature measurements, crucial for optimal climate control and energy efficiency. Its robust design and reliable performance make it a preferred choice for applications requiring dependable data acquisition. Key technical parameters include a measuring range of -50 to 120°C, an accuracy of ±0.5 K at 20°C, and a response time of approximately 50 seconds in water. The sensor features a 1.0-meter cable and a 2.5-second time constant.

Product Specifications

| Specification               | Value                                    |

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

| Type                        | NTC Thermistor Temperature Sensor        |

| Product Number              | QAE2121.010                              |

| Measuring Range             | -50 to 120°C                             |

| Accuracy                    | ±0.5 K (at 20°C)                         |

| Time Constant (approx.)     | 50 s (in water)                          |

| Cable Length                | 1.0 m                                    |

| Ingress Protection          | IP65                                     |

| Nominal Resistance          | 10 kΩ at 25°C                            |

| Sensor Element              | NTC                                      |

| Application                 | HVAC, Building Automation                |

| Connection                  | 2-wire                                   |

| Operating Voltage           | 0 to 36 V AC/DC (max.)                   |

| Storage Temperature         | -40 to 70°C                              |

| Operating Temperature       | -40 to 120°C                             |

| Dimensions (Sensor Probe)   | 50 mm length, 10 mm diameter             |

| Housing Material            | ABS                                      |

| Connection Type             | Screw terminals                          |

Core Features & Market Positioning

The SIEMENS QAE2121.010 distinguishes itself through its exceptional accuracy of ±0.5 K at 20°C, a critical factor for sophisticated building management systems where precise temperature control directly impacts energy consumption and occupant comfort. This high accuracy, combined with its wide operating temperature range of -40 to 120°C, positions it as a premium sensor for demanding applications. The IP65 ingress protection rating ensures durability and reliability even in environments with dust and water exposure, a significant advantage over less robust competitors. Its integration within the Siemens ecosystem further enhances its market appeal, offering seamless compatibility with other Siemens automation components.

Key Application Scenarios

This temperature sensor is ideally suited for critical temperature monitoring in HVAC systems, including air ducts, supply air, return air, and outdoor air measurements. It plays a vital role in chilled and hot water pipe monitoring to ensure optimal fluid temperatures for heating and cooling. The QAE2121.010 is also deployed in space temperature sensing applications where precise room conditions are paramount for comfort and energy savings. Its suitability extends to various industrial process control applications requiring accurate temperature feedback within its specified range.

Practical System Integration Guidance

Integrating the SIEMENS QAE2121.010 involves straightforward wiring to a compatible controller or monitoring device. The sensor utilizes a standard 2-wire connection, typically terminating at screw terminals. For optimal performance, ensure the sensor probe is positioned to accurately reflect the temperature of the medium being measured, avoiding direct exposure to heat sources or drafts not representative of the target environment. Calibration, if necessary, should be performed according to the controller's specifications, leveraging the sensor's inherent accuracy.

Operation and Risk Mitigation

Proper operation of the SIEMENS QAE2121.010 temperature sensor relies on maintaining it within its specified environmental and electrical operating parameters. Avoid exceeding the maximum operating voltage of 36 V AC/DC to prevent damage. Environmental risks are mitigated by its IP65 rating, offering protection against dust ingress and low-pressure water jets. Troubleshooting typically involves checking wiring connections and ensuring compatibility with the connected control system. Faults are usually indicated by abnormal readings at the controller, prompting an inspection of the sensor and its connections.

Scalability & Long-Term Value

The SIEMENS QAE2121.010 offers significant long-term value due to its compatibility with the broader Siemens Desigo™ building automation platform and other industry-standard controllers. This ensures seamless integration into new installations or upgrades of existing systems, providing a scalable solution for growing facility needs. Its robust construction and high-quality components contribute to a long operational lifespan, minimizing replacement costs and system downtime. Integration with IoT platforms is achievable through compatible controllers, enabling advanced data analytics and predictive maintenance strategies.

Frequently Asked Questions

What is the primary function of the SIEMENS QAE2121.010?

This sensor measures ambient or medium temperature with high precision. It's vital for HVAC and building automation accuracy.

It provides critical data for climate control systems. This ensures optimal energy efficiency and occupant comfort.

Its robust design makes it suitable for diverse environmental conditions. It is a reliable component for long-term monitoring.

How is the SIEMENS QAE2121.010 wired?

The sensor uses a simple 2-wire connection for data transmission. Ensure secure connection to the controller's terminals.

Polarity is not critical for this sensor type. Always refer to the controller's manual for specific wiring diagrams.

Proper wiring is essential for accurate readings and system performance. Avoid loose connections or short circuits.

What is the temperature measuring range of this sensor?

The QAE2121.010 can measure temperatures from -50 to 120 degrees Celsius. This broad range covers most HVAC and some industrial needs.

This range allows for precise monitoring in both cold and moderately hot environments. It is suitable for supply air, return air, and water pipes.

Operating outside this range can lead to inaccurate readings or sensor damage. Always ensure the application stays within specified limits.

What is the accuracy of the SIEMENS QAE2121.010?

This sensor boasts an impressive accuracy of ±0.5 Kelvin at 20°C. This precision is crucial for fine-tuned control strategies.

Such accuracy minimizes deviations and ensures system stability. It directly contributes to energy savings and enhanced comfort.

For critical applications, verify calibration periodically. Consistent accuracy is key to reliable automation.

Where is the SIEMENS QAE2121.010 commonly used?

It is widely used in HVAC systems for duct and room temperature monitoring. Applications include supply air, return air, and outdoor air sensing.

The sensor is also effective for monitoring chilled and hot water pipes. It helps maintain optimal fluid temperatures for heating and cooling.

Its versatility extends to general building automation tasks requiring precise temperature feedback. It ensures efficient operation across various zones.

What does the IP65 rating mean for this sensor?

IP65 signifies excellent protection against dust and water ingress. The sensor is dust-tight and protected against water jets.

This rating ensures reliable performance even in challenging environments. It can withstand moisture and occasional cleaning spray.

Install it in areas prone to dust or where water splashes may occur. This rating enhances its durability and lifespan.

What is the response time of the SIEMENS QAE2121.010?

The sensor has a time constant of approximately 50 seconds in water. This indicates how quickly it reacts to temperature changes.

A faster response time allows the control system to react promptly. This is crucial for maintaining stable temperature conditions.

The response time can vary depending on the medium and installation. It is a critical factor for dynamic temperature control.

Can this sensor be used for outdoor temperature measurement?

Yes, the QAE2121.010 is suitable for outdoor air temperature sensing. Its wide operating range and IP65 rating are beneficial.

Ensure proper installation to protect it from direct weather extremes if necessary. Its robust design handles typical outdoor conditions well.

Accurate outdoor temperature data is vital for optimizing HVAC system operation and energy efficiency. It enables anticipatory control.

What is the nominal resistance of the sensor?

The nominal resistance of the SIEMENS QAE2121.010 is 10 kΩ at 25°C. This is a standard value for NTC thermistors.

This resistance value is used by the controller to calculate the actual temperature. It's a key characteristic for compatibility.

Always ensure your controller is configured for a 10 kΩ NTC sensor. This is fundamental for correct operation.

Is the SIEMENS QAE2121.010 compatible with other brands of controllers?

While designed for Siemens systems, its standard NTC thermistor output allows compatibility with many universal controllers. Always verify compatibility specifications.

Ensure the controller is programmed to recognize a 10 kΩ NTC sensor with similar accuracy. This is key for seamless integration.

Consult the controller manufacturer's documentation for specific compatibility details. Proper configuration is essential.