8
G
HYGRASGARD
®
AFTF - 20 - VA
Rev. 2021 - V13
Calibratable outdoor humidity and
temperature sensor
HYGRASGARD
®
AFTF - 20-VA
(± 1.8 %) with
metal sinter filter, rugged housing,
stainless
steel V4A
, optionally with ⁄ without display,
with cable gland or M12 connector according to DIN EN 61076-2-101.
It measures the relative humidity and the temperature of the air and converts the measurand into a standard signal of 0 - 10 V or 4...20 mA. It has
four switchable temperature ranges and is applied in non-aggressive dust-free atmospheres in refrigeration, air conditioning, ventilation and clean
room technology. These measuring transducers are designed for exact detection of humidity. A digital long-term stable sensor is used as measuring
element for humidity measurement. The sensor is factory-calibrated; an environmental precision adjustment by an expert is possible.
TECHNICAL DATA
Power supply:
24 V AC (± 20 %); 15...36 V DC for U variant
15...36 V DC for I variant, depending on working resistance, residual ripple stabilised ± 0.3 V
Working resistance:
R
a
(ohm) = (U
b
-14 V) ⁄ 0.02 A for I variant, see load resistance diagram
Load resistance:
R
L
> 5 kOhm for U variant
Power consumption:
< 1.1 VA ⁄ 24 V DC ; < 2.2 VA ⁄ 24 V AC
Sensors:
digital humidity sensor with integrated temperature sensor,
low hysteresis, high long-term stability
HUMIDITY
Measuring range, humidity:
0...100 % r. H.
Permitted humidity:
< 95 % r. H., non-precipitating air
Deviation in humidity:
typically
± 1.8 %
(10...90 % r. H.) at +25 °C, otherwise ± 2.0 %
Output humidity:
0 - 10 V for U variant
4...20 mA for I variant
TEMPERATURE
Measuring range, temperature:
multi-range switching
(see table)
–35...+35 °C; –35...+75 °C; 0...+50 °C; 0...+80 °C
Ambient temperature:
storage –35...+85 °C; operation – 30...+80 °C, non-precipitating
Deviation, temperature:
typically ± 0.2 K at +25 °C
Output, temperature:
0 - 10 V for U variant
4...20 mA for I variant
Electrical connection:
2-, 3-, or 4-wire connection (see connecting diagram),
0.14 - 1.5 mm², via terminal screws
Cable connection:
cable gland, stainless steel V2A
(1.4305)
(M 20 x 1.5; with strain relief, exchangeable,
inner diameter 6 - 12 mm)
or
M12 connector
(male, 5-pin, A-code)
according to DIN EN 61076-2-101
Housing:
stainless steel V4A
(1.4571),
with non-distortion cover bolting,
impact resistant, high EMI shielding,
corrosion, temperature, weather- and UV-resistant
Housing dimensions:
143 x 97 x 61 mm (Tyr 2E)
Protective tube:
made from stainless steel V2A (1.4301), Ø 16 mm, NL = 137 mm
Sensor protection:
metal
sinter filter, Ø 16 mm, L = 32 mm, exchangeable,
stainless steel V4A (1.4404)
Process connection:
by screws
via the mounting fixture on the housing
Long-term stability:
± 1 % per year
Protection class:
III (according to EN 60 730)
Protection type:
IP 65
(according to EN 60 529)
Housing tested, TÜV SÜD, Report No. 713160960B (Skadi2)
Standards:
CE conformity according to EMC Directive 2014 ⁄ 30 ⁄ EU, according to EN 61326-1, according to EN 61326-2-3
Optional:
display with illumination,
three-line, cutout approx. 70 x 40 mm (W x H),
to display the ACTUAL temperature and ACTUAL humidity
ACCESSORIES
(see table)
