The Siemens QFM81.2 is a temperature-compensated duct humidistat with 2-point control and a microswitch, designed for the monitored and reliable control of relative humidity in ventilation and air conditioning systems.
Thanks to the temperature-independent humidity sensor, the device measures precisely in the range of 15% to 95% relative humidity.
Areas of Application:
Humidity control in ventilation and air conditioning systems
Maximum monitor in the supply air duct for systems with humidification
Minimum monitor in sensitive areas such as laboratories or production rooms
Technical Data:
Setpoint adjustment range: 15% – 95% RH
Control behavior: 2-point
Switching differential: approx. 4% RH (fixed)
Switch type: Microswitch with 1-pole, potential-free changeover contact
Contact load:
– max. 5 (3) A at AC 250 V
– min. 100 mA at AC 24 V
Temperature influence: compensated
Permissible ambient temperature (operation): 0 – 70 °C
Maintenance: maintenance-free, readjustment possible
Condition: as new
Our item number: S13/217
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Further information
Manufacturer:
Installation length:
Condition: new
Pipe connection:
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All electrical equipment has undergone a VDE safety inspection.
Delivery & Shipping
Austria: 1-2 working days
Germany: 2–3 working days
Europe-wide: 3–5 working days
Note: For freight forwarding goods from 40 kg, the delivery time is 3–5 working days.
Very nice contact, competent and very fast help. Should I have problems with my pumps in the future, I will gladly come back to Pumpenkost.
— Michael
Very good and smooth processing.
Very good and smooth process with competent advice and fast delivery.
— Marian Staller - IT
Top service and absolutely recommendable!
I'm really impressed – everything worked perfectly! The ordering process was straightforward, customer service was super friendly and helpful, and the goods were, as always, in perfect condition. This is what professional service looks like. I will definitely order here again and can only recommend it. Thank you for the great service!
— Sascha Leicht - EN
GREAT SERVICE - EXCELLENT QUALITY
I am truly impressed with this company! The pumps are of excellent quality and run perfectly. Even during the consultation, I received quick and competent assistance, allowing me to find exactly the right pump for my requirements. The delivery was prompt, and installation was hassle-free. I particularly appreciated that the team followed up after the purchase to ensure everything was running smoothly. Such service is not something to be taken for granted! Overall, a top experience – I would definitely buy here again and can highly recommend the company!
— Ingo Prantner
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FAQ - Frequently Asked Questions
If your question is not answered here, please send us a message via email or WhatsApp and we will be happy to assist you.
Products & Compatibility
How do I find the right replacement pump for my heating system?
Simply send us a photo of your current pump or its nameplate via email or Whatsapp. Our experts will identify the right model for you.
What happens if the delivered pump doesn't fit?
Of course, you have a right of return in accordance with statutory provisions. To avoid this happening in the first place, we will be happy to assist you in advance with selecting the right pump.
What do the statuses "used" or "refurbished" mean for your pumps?
These are carefully reconditioned and tested pumps that offer a cost-effective alternative and are in working order.
What product categories do you carry besides pumps?
In addition to heating, domestic water, booster, and submersible pumps, we also offer electrical engineering (electrical materials, motors, transformers), heating/plumbing accessories, as well as heat pumps and suitable heat exchangers.
Do you also carry spare parts and accessories for pumps?
Yes, our product range includes mechanical seals, pump controls, junction boxes, flanges, insulation shells, and other pump accessories.
Do you also have spare parts for electrical engineering and heating systems?
Yes, we stock spare parts for electrical equipment (e.g. relays, contactors, circuit boards) as well as for heating and sanitary systems (e.g. heating mixers, valves, non-return valves).
If a product is not currently listed, can you still procure it?
Simply contact us by email or Whatsapp and, if required, we can also source products that are not currently listed in the online shop or are currently out of stock.
Order & Conditions
How can I place a tax-free B2B order?
To do this, you must enter your tax details (VAT) under the address section during checkout. These will be verified and, if valid, you will be able to place your order tax-free.
Is payment by invoice possible?
By paying via Klarna, you have the option to complete your purchase using an invoice.
Shipping & Delivery
How long does delivery take?
Orders received by 1:00 PM on weekdays will be packed and shipped on the same day. Orders received later will be shipped on the next business day.
Within Austria, we deliver within 1 business day, and to Germany within 2–3 business days. Deliveries throughout the EU are also reliable, with delivery times varying by country.
Note: For freight items weighing 40 kg or more, the delivery time is 3–5 business days.
Will I receive a tracking number?
Yes, after shipping, we will provide you with the tracking number so you can check the status of your delivery at any time.
Certificates & Standards
Are your electrical devices safety-tested?
Yes, all electrical devices have undergone a VDE safety inspection.
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