Galltec+mela FK80J User manual

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
inuence 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 thinlm
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 coefcient 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 -
Inuence 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 specic
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 modications.
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. [phone] .Fax [phone] Tel. [phone] .Fax [phone]
E-Mail: [email protected] . Internet:www.galltec-mela.de E-mail:[e-mail] . Internet: www.galltec-mela.de

* observe max. temperature range ** suitable for EDJ controller
Overview of capacitive sensors power supply 24V AC ±10 %
Overview of capacitive sensors power supply 15...30V DC (24V AC ±10 %)
FK80_e page 2
3/4-wire system 2-wire system 3/4-wire system
EMC-information: use shielded signalling lines and earth the shielding!
Connection diagram
4-wire system (AC version) 4-wire system (AC version)
!
The electrical connection must
only be carried out by properly
qualied personnel.
FK80J
DC-Version
0...100%rh 0...10V DC 15...30V DC / 24 V AC 3/4 wire 58014700
0...100%rh 4...20 mA 15...30V DC 2 wire 58014800
0...100%rh 0...20 mA 15...30V DC 3/4 wire 58013000
TFK80J
0...100%rh 0...10V DC -30...+60°C 0...10V DC 15...30V DC / 24 V AC 3/4 wire 58574747
0...100%rh 0...10V DC 0...100°C* 0...10V DC 15...30V DC / 24 V AC 3/4 wire 58544747
0...100%rh 0...10V DC 0...+50°C 0...10V DC 15...30V DC / 24 V AC 3/4 wire 58524747
0...100%rh 0...10V DC -10...+90°C 0...10V DC 15...30V DC / 24 V AC 3/4 wire 58624747
0...100%rh 4...20mA 0...50°C 4...20mA 15...30V DC 2wire 58524848
0...100%rh 4...20mA -30...+60°C 4...20mA 15...30V DC 2wire 58574848
0...100%rh 4...20mA -20...+80°C 4...20mA 15...30V DC 2wire 58264848
0...100%rh 4...20mA -10...+90°C 4...20mA 15...30V DC 2wire 58624848
0...100%rh 4...20mA 0...100°C* 4...20mA 15...30V DC 2wire 58544848
0...100%rh 0...20mA 0...+50°C 0...20mA 15...30V DC 3/4 wire 58523030
0...100%rh 0...20mA -10...+90°C** 0...20mA 15...30V DC 3/4 wire 58623030
0...100%rh 0...20mA -30...+60°C 0...20mA 15...30V DC 3/4wire 58573030
0...100%rh 0...20mA 0...100°C* 0...20mA 15...30V DC 3/4 wire 58543030
Speciality
FK80JPt100
0...20 mA Pt100 Resistance 15...30V DC 3/4 wire 58703050
0...10V DC Pt100 Resistance 15...30V DC 3/4 wire 58704650
4...20 mA Pt100 Resistance 15...30V DC 2wire 58704850
FK80J
AC-version
0...100%rh 0...10V DC 15...30V DC / 24 V AC 3/4 wire 58014700
0...100%rh 0...20 mA 24 V AC 4 wire 58014200
TFK80J
0...100%rh 0...10V DC 0...+50°C 0...10V DC 15...30V DC / 24 V AC 3/4 wire 58524747
0...100%rh 0...10V DC -30...+60°C 0...10V DC 15...30V DC / 24 V AC 3/4 wire 58574747
0...100%rh 0...10V DC -10...+90°C 0...10V DC 15...30V DC / 24 V AC 3/4 wire 58624747
0...100%rh 0...10V DC 0...100°C* 0...10V DC 15...30V DC / 24 V AC 3/4 wire 58544747
0...100%rh 0...20mA 0...+50°C 0...20mA 24 V AC 4 wire 58524242
0...100%rh 0...20mA -30...+60°C 0...20mA 24 V AC 4 wire 58574242
0...100%rh 0...20mA -10...+90°C 0...20mA 24 V AC 4 wire 58624242
0...100%rh 0...20mA 0...100°C* 0...20mA 24 V AC 4 wire 58544242
humidity
Humidity sensor FK80J
1 2 3 4 5 6 7 1 2 3 4 5
Humidity sensor FK80J
humidity
Humidity sensor FK80J
humidity
1 2 3 4 5 6 7
15...30VDC 0...20mA
not galvanically disconnected
15...30VDC 0...10VDC
24VAC
15...30VDC
4...20mA
not galvanically disconnected
- + + - - + - + - +
Humidity temperature sensor TFK80J
not galvanically disconnected
1 2 3 4 5 6 7
humidity temperature
1 2 3 4 5
humidity temperature
Hum. temp. sensor TFK80J
galvanically disconnected
Humidity temperature sensor TFK80J
humidity temperature
1 2 3 4 5 6 7
0...20mA
0...20mA
15...30VDC 0...10VDC 0...10VDC 15...30VDC
4..20mA
15...30VDC
4..20mA
not galvanically disconnected
15...30VDC
24VAC
- + + - + - - + - + - + - + - +
24 VAC 0...20 mA 0...20 mA 24 VAC 0...20 mA
1 2 3 4 5 6 7
Humidity sensor FK80J
humidity
1 2 3 4 5 6 7
Humidity temp. sensor TFK80J
humidity temperature
positive pole = common
~ ~ + - + - ~ ~ + -

120 (4,72)
200 (7,87)
80 (3,15)
107 (4,21)
68 (2,68)
5 (1,97)
5 (1,97)
20
(7,87) Galltec
248 (9,76)
20 (7,87)
25 (9,84)
35,3 (1,39)
Dimensions diagram
FK80_e page 3
Cleaning instruction
The surface of the measuring element
must not be touched.
To clean the measuring element,
its surface can be rinsed, however
should only be moistened with water
drops; immersing into distilled water
is possible
Correct measuring values will be re-
gained as soon as the measuring
element has been dried completely.
Dry dust can simply be blown off the
measuring element. Don't use com-
pressed air for this purpose.
Contact with the inner parts nulli-
es the guarantee.
Console for wall mounting item no. 20.009
Ventilated sensor tube
for improved air ow
item no. 20.022
Accessories
Working range
-30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 °C
%RH
100
90
80
70
60
50
40
30
20
10
0
Working range FK80J and TFK80J
M20x1,5
Kabelverschraubung
cable gland
Bohrbild
Gabarit de perçage
Mounting drawing
50 (1,97) 80 (3,15)
43 (1,69)
19 (7,48)
Ø7 (2,75)
Ø

FK80_e page 4
Guide to installation
Interference is often to be encountered during installation. The correct installation procedure can prevent interference to
a very large extent. However, some ground rules should be observed.
To avoid interference, suppression should be carried out in accordance with VDE 0875 and VDE 0874
(VDE - this is assumed to be the Vorschriftenwerk Deutscher Elektrotechniker - regulations governing German
electrical engineers).
Fundamentally, interference must be removed at its source, where suppressor material is most effective. Interference can,
however, also result from electromagnetic elds via signalling lines. The EMV law determines the corresponding protective
measures. All Galltec+Mela equipment is designed in accordance with European standards EN 50081-2 and EN 50082-2
(for industrial locations). In addition, further protective measures must be observed.
Unavoidable sources of interference should be kept at a good distance from the control systems.
Data and signalling lines should not be used in parallel with control, networking and power lines.
For data and signalling lines, shielded cable should be used, and the shielding must be applied to the earth
terminal. Ensure that earth circuits and fault currents do not arise as a result of a second earth connection.
For equipment with a network connection, it is recommended that a separate network circuit is used.
During the switch process, electrical power consumers such as switch contactors, magnetic valves etc. pro-
duce induction voltages that can cause interference. In the trade there is an abundance of protective and
suppressor component parts that are most effective when applied directly to the source of the trouble. A
suitable suppressor has the added advantage that components such as relays, microswitches etc. have a
longer service life.
Further difculties during installation can arise if signalling lines are joined together with common lines. It is essential to
check whether this is permissible. Interference is particularly likely when installing using equipment of different makes.
Here, too, the trade offers isolating ampliers that overcome the problem.
Checking calibration
It is possible to use sensor checks in order to test the humidity sensors from time to time for accuracy. The physical
process is described in detail in DIN 50 008, IEC Publikation 260, ISO/R 483-1966. In the air space above an aqueous
saturated saline solutaion an ambient climate is formed whose air humidity is dependant on the water vapour pressure
of the saline solution.
The Galltec+Mela sensor checks are designed so that a foil permeable to vapour is positioned between the saline solution
and the air space (space in which the measuring element is located). This makes carrying out the sensor checks a very
straightforward procedure as follows:
Remove the protective cap of the sensor check
while opening the PG screw and introduce
the sensor duct up to the mark. Tie the sensor
in the PG screw. Please make sure that the
sensor check is well tight and air-sealed while
caring out your measurement. If you are using
a sensor with a "Polyga" measuring element,
ensure particularly that the lid of the sensor is
well tight and that the cable duct is well sealed.
After a certain period of time, a constant humi-
dity builds up between the saline solution and
the air space in which the humidity measuring
element is located. Depending on the type of
saline solution and the sensor check, humidity
values range from 33%RH to 98%RH. The stan-
dard values of the Galltec+Mela sensor checks
are 33%RH, 55%RH, 76%RH and98%RH. We
recommend a compensation period of about 2 hours. Please ensure that there are no major uctuations in temperature
during this period. Temperature uctuations severely disturb the equilibrium.
The equilibrium moisture content is dependent on the temperature - according to the type of salt. The corresponding values
are given in a correction table located on the sesnsor check.
It is important that you replace the sealing cap of the sensor check after use, otherwise the water of the saline solution will
evaporate and the check will become unusable.
Screw the check rmly onto the humidity sensor. Wait for 2 hours. Ensure that the temperature is
kept constant. Take humidity reading according to temperature.
Screw the check rmly onto the humidity sensor. Wait for 2 hours. Ensure that the temperature is
kept constant. Take humidity reading according to temperature.
Screw the check rmly onto the humidity sensor. Wait for 2 hours. Ensure that the temperature
is kept constant. Take humidity reading according to temperature.
Sensor check
33%rh
°C 5 10 15 20 25 30
%rh 34 34 34 33 33 33
Sensor check
55%rh
°C 5 10 15 20 25 30
%rh 58 57 56 55 53 52
Sensor check
76%rh
°C 5 10 15 20 25 30
%rh 76 76 76 76 76 75