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Siemens QFM3171

Name: QFM3171
Brand: Siemens
SKU: QFM3171
Price: 194.6 GBP
Availability: InStock

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£194.60 (ex. VAT)

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Marvo Stock ID MV-G92O

HS Code 9025

SKU QFM3171

Condition New sealed

Warranty 12 months

Weight (kg) 0.21

Length (mm) 206.00

Width (mm) 60.00

Height (mm) 62.80

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Specification & Description

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Commonly Asked Questions

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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.

Commonly Asked Questions

Is my order covered by a warranty?

Marvo provides a full 12-month warranty on all products, whatever the condition. For your peace of mind, all parts are ‘Marvo Approved’ which means that they have been tested and checked to ensure that they are in working condition. If you are unhappy with the part(s) you received and would like to request a return, you can do so by completing our quick and easy online form. Once we have received your Returns Request, a member of the team will be in touch to discuss this further with you. You can read more about our warranty policy here.

What payment methods do you accept?

We accept card payments from all major credit, debit and Mastercard providers including Visa, American Express, Western Union, Paypal and bank transfers. Before you complete an order you will be prompted to input your payment details, at which point you can enter the relevant card information you wish to use for your transaction. If you are experiencing issues with your payment method then you can contact our team via email here. From there, you will be directed to the most relevant resource or person to help you complete your payment, get your order processed and ensure that your parts are on the way to your delivery address.

Is Marvo a credible parts supplier?

Marvo is a highly credible supplier of industrial automation parts and components with dedicated hubs around the world offering industry-leading products and services. Marvo is committed to providing a quick, easy and reliable place to source your automation and control components. All purchases come as standard with a comprehensive 12-month return to base warranty meaning that, in just a few clicks, you can source critical parts more seamlessly than ever before. Click here to read an article on how Marvo is redefining convenience for automation and manufacturing professionals.

Have steps been taken to ensure quality control?

Marvo takes pride in product quality and has put several measures in place to assure high levels of quality standards. For your peace of mind, all parts have been ‘Marvo Approved’ which means that they have been tested and checked to ensure that they are in working condition. Redefine convenience and secure priority delivery on all parts along with a comprehensive 12-month warranty. This is the smart new way to buy automation and control components.

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Our service to you

Lightning-Fast Express Shipping: Receive your order in record time with our express shipping options, ensuring you minimize downtime and keep your projects on track.

No-Risk Returns, Guaranteed: Return your parts anytime for a full refund. Our hassle-free return policy ensures you’re never stuck with something you don’t need.

Clear Pricing with No Hidden Fees: What you see is what you pay, transparent pricing with no extra costs, ever. Rest assured, all taxes and fees are already included in your final price.

Rock-Solid Reliability at a Fraction of the Cost: Get pre-owned electronic parts that are fully tested for peak performance, saving you money without compromising on quality, backed by a comprehensive warranty.

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.

Part conditions explained

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New unsealed: The product is in its original packaging, but the packaging has been opened or unsealed. It has never been used and should be in near pristine condition.

New sealed: The product is sealed in its original packaging. It has never been opened or used, ensuring that it's in an untouched state.

New unboxed: The product does not come in its original packaging, but it has never been used and is in great working condition.

Refurbished: The product has been previously used, but it has undergone a thorough refurbishment process to restore it to a like-new or functional condition. Any defects or issues have been addressed, making it suitable for reuse.

Used: The product has been previously owned and has been used. It may show signs of wear and tear but is still functional and operational. The condition may vary depending on the specific item and its usage history.

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