
Quality product for HVAC sector, accuracy 3 % r.H.
The calibrateable room humidity and temperature sensor HYGRASGARD® KFF ⁄ KFTF, AFF ⁄ AFTF, AFF - LC ⁄ AFTF - LC measures the rela-
tive humidity and ⁄ or temperature of air. It converts the measurands into standard signals of 0 -10 V or 4...20 mA and is optional available
with or without display. Terminal box enclosure made of impact-resistant plastic with enclosure cover with quick-locking screws. It has four
switchable temperature ranges and is applied in non-aggressive dust-free ambiences in refrigeration, air conditioning, ventilation and
clean room technology. Relative humidity (in % r. H.) is the quotient of water vapour partial pressure divided by the saturation vapour pres-
sure at the respective gas temperature. These measuring transducers are designed for exact detection of humidity. A digital long-term
stable sensor is used as measuring element for humidity measurement. Fine adjustment by the user is possible. Mounting flange is
included in the scope of delivery.
TECHNICAL DATA:
Power supply: ..............................24 V AC (± 20 %) and 15 … 36 V DC (± 10 %) for U variant
15 … 36 V DC (± 10 %) for I variant (depending on
working resistance)
Power consumption: .................. < 1.1 VA ⁄ 24 V DC ; < 2.2 VA ⁄ 24 V AC
Sensors: .......................................digital humidity sensor with integrated temperature sensor,
dew-proof, small hysteresis, high long-term stability
Sensor protection: ..................... membrane filter, plastic, exchangeable
HUMIDITY:
Measuring range, humidity: ...... 0 …100 % r. H.
(output corresponding to 0 -10 V or 4 … 20 mA)
Operating range, humidity: ....... 0 … 95 % r. H. (without formation of dew)
Deviation, humidity: .................... ± 3 % r. H. (20…80 %) at +20 °C, otherwise ± 5 % r. H.
Output, humidity: ........................ 0 -10 V at U variant
4 … 20 mA at I variant, working resistance < 800 Ω,
see load resistance diagram
TEMPERATURE:
Measuring range, temperature: ..
multi-range switching (see table)
- 35 ...+35 °C; - 35 ...+75 °C; 0 ...+50 °C; 0 ...+80 °C
(output corresponding to 0 -10 V or 4 … 20 mA)
Operating range, temperature:
... - 35 ...+80 °C
Deviation, temperature: ............ ± 0.8 K (KFF ⁄ KFTF - U ), ± 0.8 K (KFF ⁄ KFTF - I )
at 20 °C, depending on place of installation and
mounting position
Output, temperature: ................ 0 -10 V or 4 … 20 mA or Ohm value
Ambient temperature: .............. storage - 25 …+ 50 °C, operation - 5 …+ 55 °C
Electrical connection: ................ 2-, 3-, or 4-wire connection (see connecting diagram),
0.14 - 1.5 mm², via terminal screws on circuit board
Enclosure: .................................... plastic, material polyamide, 30 % glass-globe-reinforced,
with quick-locking screws,
colour pure white (similar RAL 9010)
Dimensions: ................................. KFF ⁄ KFTF: 72 x 64 x 39.4 mm
AFF ⁄ AFTF: 108 x 70 x 73.5 mm
AFF-LC ⁄ AFTF-LC: 72 x 64 x 39.4 mm
Cable gland: .................................M16, including strain relief
Protective tube: ..........................stainless steel, Ø 16 mm,
KFF ⁄ KFTF: nominal length NL = 230 mm
(optional 400 mm, 500 mm)
AFF ⁄ AFTF: nominal length NL = 45 mm
Process connection: .................. KFF ⁄ KFTF: by mounting flange, plastic
(included in the scope of delivery)
(galvanised steel optional)
AFF ⁄ AFTF: by screws
Long-term stability: .................... ± 1 % per year
Protection class: ........................ III (according to EN 60 730)
Protection type:.......................... IP 65 (according to EN 60 529)
Standards: ...................................CE conformity,
according to EMC directive 2004 ⁄ 108 ⁄ EC,
according to EN 61326-1: 2006,
according to EN 61326-2-3: 2006
Optional: .......................................two-line display with illumination, 36 x15 mm (W x H),
for displaying ACTUAL temperature and ⁄ or ACTUAL humidity
G HYGRASGARD® KFF ⁄ KFTF, AFF ⁄ AFTF, AFF - LC ⁄ AFTF - LC