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What is the accuracy of the FLW-122?

The FLW-122 achieves an accuracy of <3% of the measured value. However, this is highly dependent on the evaluation electronics used.

Which flow sensors is the module compatible with?

The module is compatible with FS5/7 and OOL flow sensors.

Which parameters are recorded for air quality measurement?

Air quality measurements primarily record pollutants such as particulate matter, nitrogen dioxide, ozone, carbon monoxide, sulphur dioxide and volatile organic compounds (VOCs), as well as climatic parameters such as temperature, humidity and CO₂ concentration, in order to assess both outdoor and indoor air quality.

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When installing the duct sensor, the sensor tube should point downwards to prevent measurement errors due to the self-heating of the electronics. It should be noted at this point that the sensor has a certain degree of pressure resistance at the head, but is not suitable for use with compressed air at higher pressures. If the sensor is to be used outdoors, a weatherproof housing is recommended. The operating instructions for our duct sensor also include a drilling template for installation.

Can B+B produce customised items?

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The humidity sensor comes with a 25 µm PE sintered filter as standard. Other filters and special hydrophobic filters are of course available as optional accessories.

What types of duct sensors are available from B+B?

The channel sensors can be individually configured using three different components: the measured variable (temperature, temperature and humidity), the output signal (0...10 V or 4...20 mA) and the version with or without display.

What are duct sensors and what are they used for?

Duct sensors have been specially developed for installation in ventilation or air conditioning ducts. They measure the air temperature and/or humidity directly in the air flow, thus providing precise data for control and monitoring systems.

Can B+B produce customised items?

Yes, customised designs are available on request. Please note that due to the planning and implementation costs involved, we can only produce customised designs for orders with a minimum value of €500.00.

Capacitive humidity sensor KFS330

Name: Capacitive humidity sensor KFS330
Brand: B+B Thermo-Technik
SKU: SHOP KFS330
Availability: InStock

Article number: SHOP KFS330

€30.56

excl. VAT plus shipping

Delivery time: 2-3 working days after receipt of payment (advance payment) or conclusion of contract

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1 piece each	€30.56
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Description:	KFS330, capacitive humidity sensor with high chemical resistance
Linearity factor:	< 2% RH (15 %RH up to 90 % RH, at 23 °C after one-point calibration)
Temperature dependence:	Nominal : Δ %RH = (B1 x %RH + B2) x T[°C] + (B3 x %RH +B4) B1 = 0,0011 [°C¬-1], B2= 0,0892 [%RH/°C], B3 = - 0,0268, B4 = - 2,079 [%RH]
Operating temperature:	-40...+190 °C
Humidity measuring range:	0...100% RH (max. dew point = +95 °C)
Response time humidity:	< 6 s
Sensitivity:	Typical at 300 pF : 0,45 pF / %RH
Hysteresis:	< 2% RH
Connection wires:	CuP - Sil, tinned, 10 mm
Dimensions:	(LxWxH) 10.8 x 3.81 x 0.4 mm
Signal form:	AC voltage without DC component
Measuring voltage:	max. 12 V AC
Measuring frequency:	1 kHz to 100 kHz (recommended 10 kHz)
Rated capacity:	300pF ± 40pF (at +23 °C and 30 % RH)
Loss factor:	< 0.01 (at 23 °C, at 10kH, at 90% RH)
Weight:	0.001 kg

The KFS330 capacitive humidity sensor has been specially developed for high-quality measurement applications in extreme environments. It is characterized by outstanding chemical resistance and an extremely high application temperature range. This makes it ideal for oil applications, among other things. The KFS330 humidity sensor can measure 0% RH to 100% RH (maximum dew point +95°C), with a capacitance of 300 pF ±40 pF (at 30% RH and +23 °C) and operates in a temperature range of -40 °C to +190 °C. Advantages and features of the KFS330 humidity sensor are:

High chemical resistance
Very low drift
Wide temperature range from -40 to 190 °C
High moisture stability
Condensation resistant
Fast regeneration time after condensation

Typical areas of application

Industrial Metrology
Medical technology
Pressure Dew Point Measurement Technology

Title	File name	File Size	File extension	Date	Download
Datasheet capacitive humidity sensor KFS330	Datasheet_capacitive_humidity_sensor_KFS330	275kb	pdf	2026-02-17 08:36
Datenblatt kapazitiver Feuchtesensor KFS330	Datenblatt_kapazitiver_FeuchtesensorKFS330	289kb	pdf	2026-02-17 08:36

Technical details

Description:	KFS330, capacitive humidity sensor with high chemical resistance
Linearity factor:	< 2% RH (15 %RH up to 90 % RH, at 23 °C after one-point calibration)
Temperature dependence:	Nominal : Δ %RH = (B1 x %RH + B2) x T[°C] + (B3 x %RH +B4) B1 = 0,0011 [°C¬-1], B2= 0,0892 [%RH/°C], B3 = - 0,0268, B4 = - 2,079 [%RH]
Operating temperature:	-40...+190 °C
Humidity measuring range:	0...100% RH (max. dew point = +95 °C)
Response time humidity:	< 6 s
Sensitivity:	Typical at 300 pF : 0,45 pF / %RH
Hysteresis:	< 2% RH
Connection wires:	CuP - Sil, tinned, 10 mm
Dimensions:	(LxWxH) 10.8 x 3.81 x 0.4 mm
Signal form:	AC voltage without DC component
Measuring voltage:	max. 12 V AC
Measuring frequency:	1 kHz to 100 kHz (recommended 10 kHz)
Rated capacity:	300pF ± 40pF (at +23 °C and 30 % RH)
Loss factor:	< 0.01 (at 23 °C, at 10kH, at 90% RH)
Weight:	0.001 kg

Product description

The KFS330 capacitive humidity sensor has been specially developed for high-quality measurement applications in extreme environments. It is characterized by outstanding chemical resistance and an extremely high application temperature range. This makes it ideal for oil applications, among other things. The KFS330 humidity sensor can measure 0% RH to 100% RH (maximum dew point +95°C), with a capacitance of 300 pF ±40 pF (at 30% RH and +23 °C) and operates in a temperature range of -40 °C to +190 °C. Advantages and features of the KFS330 humidity sensor are:

High chemical resistance
Very low drift
Wide temperature range from -40 to 190 °C
High moisture stability
Condensation resistant
Fast regeneration time after condensation

Typical areas of application

Industrial Metrology
Medical technology
Pressure Dew Point Measurement Technology

Downloads

Title	File name	File Size	File extension	Date	Download
Datasheet capacitive humidity sensor KFS330	Datasheet_capacitive_humidity_sensor_KFS330	275kb	pdf	2026-02-17 08:36
Datenblatt kapazitiver Feuchtesensor KFS330	Datenblatt_kapazitiver_FeuchtesensorKFS330	289kb	pdf	2026-02-17 08:36

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FAQ

Versand

Der Versand unserer Produkte erfolgt per DPD gemäß ICC-Incoterms®2010:

EXW B+B Thermo-Technik GmbH Donaueschingen Incoterms®2010

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Sofortüberweisung:
Germany and Austria

Rechnung (Netto 30 Tage):

Deutsche Firmenkunden,

Schweiz

Sichertheit

Frequently asked questions & answers

What shipping methods does the B+B online shop offer?

We generally offer standard shipping via DPD. You can also pick up your order yourself or ship with your own tracking number. You can select the option you prefer during the ordering process.

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You find more information about this topic on our rights of withdrawal page.

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You can pay with PayPal, credit card (VISA and MaserCard), payment in advance, Sofortüberweisung (direct banking) and in some cases invoice. You can find more information on the page shipping and payment.

Can B+B produce customized items?

Yes, at B+B we can manufacture customised items for you with a minimum order value of €500.00.

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Certifications

Thank to the latest research, development and manufacturing technologies, as well as DIN EN ISO 3001:2015 and DIN EN 61340-5-1 certifications, we produce our products in accordance with the highest quality standards.

Calibration service

The B+B calibration laboratory is accredited by the German Accreditation Body (DAkkS) in accordance with DIN EN ISO/IEC 17025:2018 for the thermodynamic measurement parameters of temperature and relative humidity.

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You tell us your application and we will supply you with the right product for measurement and monitoring. We place particular emphasis on close cooperation in order to guarantee optimal product development in live with your requirements.

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B+B Thermo-Technik GmbH is based in the town Donaueschingen south-west Germany. From here, B+B quality products are distributed worldwide.

Capacitive humidity sensor KFS330

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