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G
HYGRASREG
®
AFTF-35
Rev. Data - V20
Condensation-protected on-wall sensor
HYGRASREG
®
AFTF-35
with active and switching output, housing made of impact-resistant plastic
with quick-locking screws, cable gland, plastic sinter filter (replaceable), optionally with ⁄ without display, for detecting relative humidity
(0…100 % RH) and temperature (4 switchable measuring ranges, max. 0...+100 °C) as well as for determining various parameters of humidity
measurement technology. The measuring transducer converts the measured variables into a standard signal of 0 - 10 V or 4…20 mA.
The unit is specially designed for use in the
high humidity range
(95…99 % RH). A long-term stable,
digital humidity and temperature sensor
is
used. Overtemperature prevents or hinders dew formation on the humidity sensor. A second, separate temperature measuring element is used to
determine the actual relative humidity of the ambient air. The following measured variables are calculated internally from these parameters and
are retrievable via output
OUT3
: absolute humidity, mixing ratio, dew point and wet bulb temperature (can be changed via DIP switch).
The sensor is used in medical technology, refrigeration technology, control technology, air conditioning and clean room technology.
The sensor is factory-calibrated; an environmental precision adjustment by an expert is possible.
TECHNICAL DATA
Power supply:
24 V AC/DC (± 10 %)
Working resistance:
> 100 kOhm for U variant; 100…500 Ohm for I variant
Power consumption:
typically < 6 W at 24 V DC, peak current 200 mA
Measured variables:
relative humidity [% RH], temperature [°C]
Parameters:
absolute humidity [g/m
3
], mixture ratio [g/kg], dew point [°C], wet bulb temperature [°C]
Outputs:
3 active outputs (0 - 10 V or 4…20 mA)
1 changeover contact
Sensor:
digital humidity sensor with integrated temperature sensor,
low hysteresis, high long-term stability,
with condensation protection through heating function
(plus a second, separate temperature measuring element)
Sensor protection:
plastic
sinter filter, Ø 16 mm, L = 35 mm, exchangeable
(optional
metal
sinter filter, Ø 16 mm, L = 32 mm)
HUMIDITY
Measuring range, humidity:
0…100 % RH
Deviation in humidity:
typically ± 3.0 %
(30…70 % RH) at +25 °C, otherwise ± 3.5 %
(deviations of alternative parameters result
from deviations from humidity and temperature.)
Output humidity:
0 - 10 V for U variant; 4…20 mA for I variant
TEMPERATURE
Temperature measuring range:
Multi-range switching with 4 switchable measuring ranges
(see table)
0...+50 °C (default); –20...+50 °C; –20...+80 °C; 0...+100 °C
Deviation in temperature:
typically ± 0.5 K at +25 °C
Temperature output:
0 - 10 V for U variant; 4…20 mA for I variant
Long-term stability:
± 1 % per year
Response time (t90):
< 60 s
Warm-up time:
< 10 min
Electrical connection:
0.14 - 1.5 mm², via terminal screws
Cable connection:
Cable gland
, plastic (M 16 x 1.5; with strain relief,
exchangeable, max. inner diameter 10.4 mm)
Housing:
Plastic, UV-resistant, material polyamide, 30 % glass-globe reinforced,
with quick-locking screws (slotted ⁄ Phillips head combination),
colour traffic white (similar to RAL 9016), enclosure cover for display is transparent!
Housing dimensions:
126 x 90 x 50 mm (Tyr 2)
Protective tube:
made of stainless steel
V2A
(1.4301),
Ø 16 mm, NL = 55 mm
(combined humidity and temperature measuring element)
and
of stainless steel
V4A
(1.4571), Ø 6 mm, NL = 65 mm
(via a second, separate temperature measuring element)
Process connection:
via screws
Ambient temperature:
storage –20...+50 °C; operation –20...+50 °C
Permitted humidity:
< 99 % RH, non-precipitating air free of harmful substances
Protection class:
III (as per EN 60 730)
IP rating:
IP 65
(as per EN 60 529) housing, IP 20 sensor technology
Standards:
CE-conformity, electromagnetic compatibility according to EN 61 326,
EMC Directive 2014 ⁄ 30 ⁄ EU
continued on next page!
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