Duct sensor for measuring relative and absolute humidity, enthalpy, dew point and temperature in gaseous media of heating, ventilation and air-conditioning systems as well as clean rooms. The optional features, such as relay outputs for 2-point controllers or 2-stage 2-point controllers and color-changing LCD allow for a wide range of applications. Depending on the model, the FTK+ can be individually configured via Thermokon USEapp. The accuracy of the humidity sensor is 2%. A hinged cover and tool-free wiring as well as removable cable entries ensure a quick and easy installation.

Measured valueshumidity, temperature, output humidity configurable
Output voltageVV | VVS: 2x 0..10 V or 0..5 V (adjustable via jumper, min. load 10 kΩ)
Output currentAA | AAS: 2x 4..20 mA (max. load 500 Ω)
Output passiveVVS | AAS: passive temperature sensor
Power supply15..24 V = (±10%) or 24 V ~ (±10%) SELV, AA: 15..24 V = (±10%) SELV
Power consumptionVV | VVS: max. 0,4 W (24 V =) | 0,8 VA (24 V ~), AA | AAS: max. 1 W (24 V =)
Measuring range temp.-40..+60 °C | 0..+50 °C | -20..+80 °C | -15..+35 °C, adjustable at the transducer, default setting: -20..+80 °C, passive: depending on used sensor
Measuring range humidity0..100% rH non-condensing, enthalpy: 0..85 KJ/kg, absolute humidity: 0..50 | 0..80 g/m³, dew point: 0..+50 | -20..+80 °C, adjustable at the transducer
Accuracy temperature±0,3 K (typ. at 21 °C within default measuring range), passive: depending on used sensor
Accuracy humidity±2% between 10..90% rH (typ. at 21 °C)
Air speedmax. 12 m/s
Enclosureenclosure USE-S, PC, pure white
Protection (IP)IP65 according to EN 60529
Cable entryFlextherm M20 for wire Ø=4,5..9 mm, removable
Electrical connectionremovable plug-in terminal, max. 2,5 mm²
PipePA6, black, Ø=19,5 mm, length 140 | 270 | 400 mm
Filterstainless steel wire mesh
Ambient condition-20..+70 °C, max. 85% rH short term condensation
Delivery contentincl. mounting flange
Notesadditional passive temperature sensor available (type VVS/AAS)
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Thermokon Sensortechnik GmbH
Platanenweg 1
35756 Mittenaar
Tel.: +49 2778 6960-0


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