Showcase humidity and temperature sensor HYGRASGARD® VFF / VFTF
The calibratable HYGRASGARD® VFF / VFTF humidity and temperature transmitter measures the relative humidity and temperature of air. It converts the measurands of humidity and temperature into a standard signal of 0-10 V or 4...20 mA, and is available with/without an optional display. The sensor device supports four switchable temperature ranges. Relative humidity (in % r.H.) is the quotient of water vapour partial pressure divided by the saturation vapour pressure at the respective gas temperature.
The measuring transducer provides precise detection of temperature and humidity. A digital, long-term stable sensor is used as a measuring element for humidity and temperature.
Voltage supply
24 V AC (± 20 %) and
15…36 V DC
Measuring range, humidity
0...100 % r. H.
Operating range, humidity
0...95 % r. H. (without dew formation)
Deviation of humidity
typical ± 2.0 % r. H. (20…80 % r. H. ); at + 25 °C, otherwise ± 3.0 % r. H.
Load resistance
RL > 5 kOhm
Output, humidity
0 - 10 V
Measuring range, temperature
multi-range switching
with 4 switchable measuring ranges
–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
0...+50 °C
Sensor protection
probe made of stainless steel, V4A (1.4571), pluggable;
sensor head Ø = 17 mm, H = approx. 2.5 mm;
protective sleeve Ø = 10 mm, NL = approx. 25 mm, M10 x 1.0;
with plastic plug connector Ø = approx. 11 mm,
NL = approx. 25 mm,
Current consumption
max. 10 mA at 24 V DC
Temperature deviation
typically ± 0.2 K at +25 °C
Ambient temperature
storage –5...+60 °C
operation –5...+60 °C
Output, temperature
0 - 10 V
Connection cable
PVC, LiYY, 4 x 0.14 mm²,
KL = approx. 2 m
Electrical connection
2-, 3- or 4-wire connection
0.14 -1.5 mm ² via terminal screws on circuit board
Cable connection
cable gland, plastic (M 16 x 1.5; with strain relief, exchangeable, max. inner diameter 10.4 mm) or
M12 connector according to DIN EN 61076-2-101 (optional on request)
Cable gland
M 16 x 1.5, including strain relief, exchangeable,
max. inner diameter 10.4 mm
sensor cable
PVC, LiYY, 4 x 0.14 mm²,
KL = approx. 2 m
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