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Specification & Description
| Specification | Description |
|---|---|
| Part Number | QFM3171 |
| Alternative Part Number | QFM3171 |
| Manufacturer | Siemens |
| Operating Voltage | AC 24 V / DC 13.5...35 V |
| Signal Output | DC 0...5 V / DC 0...10 V / 4…20 mA for relative humidity and temperature |
| Measuring Accuracy | Very high across the entire measuring range |
| Function Test | Included |
| Humidity Measurement | Capacitive |
| Range of Use | -40…+70 °C / 0…100 % r.h. (with LCD display -25…+70 °C / 0…100 % r.h.) |
| Applications | Ventilation and air conditioning plants requiring high accuracy and short response times |
| Suitable Environments | Storage and production facilities, laboratories, hospitals, computer centres, indoor pools |
| Control Sensor Use | In supply or extract air |
| Limit Sensor Use | For maximum limitation of supply air humidity after a steam humidifier |
| Additional Sensor Use | For enthalpy and absolute humidity, in conjunction with SEZ220 |
| Housing Material | Polycarbonate and PA66 – GF35 |
| Protection Class | III according to EN 60730-1 |
| Protection Degree | IP65 according to EN 60529 in the built-in state |
| Connection Terminals | 1× 2.5 mm² or 2 × 1.5 mm² |
| Cable Entry Gland | M 16 x 1.5 (included) |
| Environmental Conditions | Operable in climatic conditions class 4K2 to IEC 60 721-3-4 and mechanical conditions 3M2 |
| Display | LCD display option available for certain models |
| Mounting | Can be mounted directly to duct or with mounting flange |
| Sensor Tip | Field replaceable on certain models |
The Siemens QFM3171 is a high-precision duct sensor designed for use in ventilation and air conditioning systems, where accurate and responsive measurement of relative humidity and temperature is essential. This sensor is engineered to provide very high measuring accuracy across the entire humidity range of 0 to 100%, making it suitable for a variety of demanding applications. These include storage and production facilities in industries such as paper, textile, pharmaceutical, food, chemical, and electronics, as well as in laboratories, hospitals, computer centres, indoor swimming pools, and greenhouses.
The QFM3171 operates on a supply voltage of DC 13.5 to 35 V and offers a 4 to 20 mA signal output for both humidity and temperature measurements. Its robust design ensures reliable performance in a range of environmental conditions, with a temperature operating range of -40 to +70°C for the sensor itself. The unit is also equipped with a field-replaceable sensor tip, which simplifies maintenance and ensures long-term accuracy and reliability.
Installation of the QFM3171 is straightforward, with clear instructions for securing the sensor within the ductwork to ensure optimal airflow and accurate readings. The sensor's compact and durable construction, combined with its high level of precision, makes it an excellent choice for building automation systems and for ensuring optimal climate control in critical environments.
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Frequently Asked Questions
What is the purpose of the Siemens QFM3171 duct sensor?
The Siemens QFM3171 duct sensor is designed for use in ventilation and air conditioning systems where high accuracy and short response times for measuring relative humidity and temperature are required. It is suitable for a wide range of applications, including storage and production facilities, laboratories, hospitals, computer centres, indoor swimming pools, and greenhouses.
How does the Siemens QFM3171 ensure high measuring accuracy?
The Siemens QFM3171 duct sensor utilises a capacitive humidity sensing element and a Pt 1000 temperature sensing element to ensure very high measuring accuracy across the entire measuring range. It also features a function test capability to ensure the sensor is operating correctly.
Can the Siemens QFM3171 duct sensor be used in environments with electromagnetic interference?
Yes, the Siemens QFM3171 duct sensor should be connected using shielded cables in environments with electromagnetic compatibility (EMC) problems to prevent electrical interference that could affect the sensor's readings.
What type of output signals does the Siemens QFM3171 provide?
The Siemens QFM3171 duct sensor provides linear output signals for both humidity and temperature. It can output DC 0...5 V, DC 0...10 V, or 4…20 mA signals for relative humidity and temperature, depending on the configuration.
What are the power requirements for the Siemens QFM3171?
The Siemens QFM3171 duct sensor operates on AC 24 V or DC 13.5...35 V power supply. It is important to ensure that the power source complies with the local safety regulations and is capable of providing a stable supply within these voltage ranges.
How should the Siemens QFM3171 be mounted in a duct?
The Siemens QFM3171 should be mounted in the centre of the duct wall to ensure accurate readings. It is recommended to maintain a minimum distance of 3 m from steam humidifiers and to fit the sensor in the extract air duct if the application involves dew point shifting.
What are the environmental operating conditions for the Siemens QFM3171?
The Siemens QFM3171 duct sensor can operate in a temperature range of -40 to +70 °C and a humidity range of 0 to 100% r.h. It is designed to withstand various environmental conditions within these ranges.
What should be done if the Siemens QFM3171 duct sensor needs to be tested?
The Siemens QFM3171 duct sensor has a test function that can be activated to check the wiring and output signals. It is recommended to refer to the mounting instructions for details on how to use the test function.
What materials are used in the construction of the Siemens QFM3171?
The Siemens QFM3171 duct sensor is constructed with a polycarbonate base and cover, a polycarbonate immersion rod and filter cap, and a mounting flange made of PA66 – GF35. These materials are chosen for their durability and suitability for the sensor's intended use.
How can the Siemens QFM3171 duct sensor be disposed of at the end of its service life?
At the end of its service life, the Siemens QFM3171 duct sensor should be disposed of at separate collection and recycling facilities in accordance with local and national legislation. It is important to delete all personal data and ensure that the product is not disposed of as domestic waste.
