Humidity Sensor FK80J
and
Humidity-Temperature Sensor TFK80J
with capacitive measuring element
with current or voltage output,
0...20mA / 0...10VDC or 4...20mA to determine relative air hu-
midity and temperature, duct version
Technical Data
measuring range humidity ........................................ 0..100%rh
measuring element ............................................ capacitive FE09
accuracy at 23°C (73,4°F) ................ ±2.0%rh (40...60%rh)
at 23°C (73,4°F) ................... ±2.5%rh (otherwise)
includes linearity and repeatability
inuence of temperature ................................. < 0.15%rh per K
working range ............................................................. 5...95%rh
measuring medium ................. air, pressureless, non-aggressive
Response time (at calm air) ............................................... < 20 s
output humidity ..............................0...10V or 0...20mA (4wire)
................................... or 4...20mA (2wire)
measuring range temperature
..................0...+50°C,-10...90°C1),-30...60°C,0...100°C1)
measuring element .............................................. Pt100 class B
accuracy at 0...10V .................................. ±0.2 K ±0.36 °F
at (0)4...20mA ........................... ±0.3 K ±0.54 °F
working range .................................... -30...+80°C (-22...176°F)
output temperature .........................0...10V or 0...20mA (4wire)
................................... or 4...20mA (2wire)
0ther temperature outputs
NTC; PTC; KTY; LMx35; Pt100; Pt1000; Ni1000; AD592; LM34;
BALKO 1kΩ; SILICON 2kΩ;
SEMICONDUCTOR 559 mVDC @23°C (75°F)
Thermistors @ 25°C (77°F) 1,8kΩ; 2,252kΩ; 3kΩ; 5kΩ; 10kΩ;
1,8kΩ (Type II; III, CSI); 20kΩ; 100kΩ
power supply ..................................... 15..30V DC / 24VAC± 10%
electromagnetic compatibility EMC
resistance to interference ............................... EN 50 082-2
interference emission ................................... EN 50 081-2
max. load ...........................
(current output only)
min load (voltage output only) ............................................ 10 kΩ
power consumption ....................................................... < 5 mA
permissible ambient temperature ...... -40...+80°C (-40...176°F)
at the housing ....... -10....+60°C (14...140°F)
admitted air speed ........................................ 15 m/sec (50 ft/sec)
Minimum air speed (across the sensor):
output 0...10V, 2x 0...1V ................................................ ≥0.5m/s
4...20mA, 2x 0...10V .............................................. ≥1m/s
2x 4...20mA ........................................................ ≥1.5m/s
probe length ....................................................... 200mm (7,87")
probe material ..................... aluminium, electrolytically oxidized
for channel mounting ................................ perforation in the case
mounting position ...................................................... as you like
contacting ............................ connecting terminals in the housing
connecting terminal conductor cross sections
...... 1.5mm2(0,023"2)
housing .............................................................. polystyrol-ABS
protective system ............................................................... IP64
weight ..................................................... approx. 0.3 kg (0.6 lbs)
1) please observe working range
Description of the sensors
The sensors FK80J (humidity only) / TFK80J (humidity
and temperature) measure the air humidity by means
of a humidiy-dependant condenser. The capacitive
humidity measuring element, produced using thinlm
technology, consists of a base plate, on which the
electrodes are housed and a hygroscopic polymer
layer avove it. The hygroscopic polymer layer absorbs
water molecules from the medium to be measured (air)
or releases them, thereby altering the capacity of the
condenser. In a tandem-arranged electronic device, the
change in capacity is processed via integrated signal
preprocessing into signals 0..20mA or 0..10VDC or
4..20mA.
The measuring element is protected by a protective
guard. The sensors are designed for pressureless
systems - the measuring medium is non-corrosive air.
The TFK80J sensors also contain a semi-conductor
temperature sensor for simultaneous temperature
measurement. Its measured values are likewise con-
verted into standardised signals 0..20mA or 0..10VDC
or 4..20mA
The temperature coefcient as well as the self-heating
of the electronic may vary according to the location and
the application (especially with sensors where electronic
and measuring system are integrated in one housing.
Maintenance - Application instructions -
Inuence of dirt
In a clean environment, the measuring element is main-
tenance-free. Depending on their type and concentra-
tion, aggressive media containing solvents can cause
incorrect readings or cause the sensor to fail. Direct
sunlight should be avoided. Substances deposited on
the sensor element (e. g. resin aerosols, paint aerosols,
smoke deposits etc.) are harmful as they eventually
form a water-repellent lm (this applies to all humidity
sensors with hygroscopic measuring elements).
Please consult "application instructions for the
sensing elements" (product info sheet no. A 1) or
check with the manufacturer for further information
which you need to bear in mind when using humidity
sensors with capacitive sensing elements.
This information is based on current knowledge and is intended to provide details of our products and their possible applications. It does not, therefore, act as a guarantee of specic
properties of the products described or of their suitability for a particular application. It is our experience that the equipment may be used across a broad spectrum of applications under
the most varied conditions and loads. We cannot appraise every individual case. Purchasers and/or users are responsible for checking the equipment for suitability for any particular
application. Any existing industrial rights of protection must be observed. The perfect quality of our products is guaranteed under our General Conditions of Sale. Issue : November
2014 FK80_E. Subject to modications.
supply - 10 VDC
0.02 amps
RL(Ω) =
Galltec Mess- und Regeltechnik GmbH MELA Sensortechnik GmbH
D-71145 Bondorf . Germany D-07987 Mohlsdorf-Teichwolframsdorf . Germany
Tel. +49 (0)7457-9453-0 .Fax +49 (0)7457-3758 Tel. +49(0)3661-62704-0 .Fax +49(0)3661-62704-20
E-Mail:
[email protected] . Internet:www
.galltec-mela.de
E-mail:mela@melasensor
.de
. Internet: www
.galltec-mela.de
