Screw-in humidity and temperature sensor for pressure systems HYGRASGARD® ESFTF

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Product group: WG02
Screw-in humidity and temperature sensor for pressure systems HYGRASGARD® ESFTF
The humidity transmitters of the HYGRASGARD® ESFF / ESFTF series are used for measuring relative humidity and air temperature pressurised systems, and convert these measured values to standard signals of 4...20 mA or 0-10 V. Process connection is G ½" straight external pipe thread, with a terminal box housing made of impact resistant plastic, and housing cover with quick-locking screws.
The screw-in humidity measuring transducers have been designed for operation in pollutant-free, non-precipitating air. They are mounted vertically with the sensor pointing down.
Technical details
Voltage supply
24 V AC/DC (± 10 %) for U -variant;
15...36 V DC for I -variant, load-dependent
Power consumption
1.1 VA for U variant;1.5 W for I variant
Data points
relative humidity [% RH], absolute humidity [g/m3], mixing ratio [g/kg], dew point [°C], temperature [°C]
Working resistance
RLmax = (UB - 15 V) / 0.02 A for I -variant, see load diagram
Measuring range, humidity
0...100 % RH (default)
Deviation of humidity
typically ± 3.0 % (30...70 % RH) at +25 °C, otherwise ± 3.5 %
(deviation of the alternative parameters result
from the deviations of humidity and temperature).
Measuring range, temperature
multi-range switching with 4 switchable measuring ranges
0...+50 °C (default); –20...+80 °C; –30...+70 °C; 0...+100 °C
Temperature deviation
typically ± 0.5 K at +25 °C
Warm up time
< 5 min
Response time
< 60 s
0 - 10 V for U variant; 4...20 mA for I variant
digital humidity sensor
with integrated temperature sensor,
low hysteresis, high long-term stability
Sensor protection
Metal sintered filter, Ø 20 mm, replaceable, with condensation protection due to heating function
Ambient temperature
storage –20...+ 50 °C
operation 0...+ 50 °C
Process connection
screwed socket with G ½ " straight pipe thread, immersion depth 25 mm
Protective tube
made of metal, Ø 20 mm, NL = 115 mm, pressure resistance pmax = 10 bar
Electrical connection
3- or 4-wire connection
0.14 - 1.5 mm² via plug terminals
plastic, UV-stabilised,
material polyamide, 30 % glass-globe-reinforced
colour traffic white (similar to RAL 9016)
ALTF 02 with snap-on lid,
72 x 64 x 37,8 mm (Tyr 1)
vertical mounting, humidity sensor at the bottom
Long-term stability
± 1 %/ year
< 99% RH, pollutant-free, non-precipitating air
Protection class
III (according to EN 60 730)
Protection type
IP 65 (according to EN 60 529) in the built-in state,
Housing tested, TÜV SÜD, Report No. 713139052 (Tyr 1)
Sensorschutzfunktion bei Hochfeuchte (95...99 % RH)
Übersteigt die relative Feuchte den werksseitig vorgegebenen Schwellwert von 95 % RH, wird eine zeitlich begrenzte Heizfunktion aktiviert und der Sensor vor Kondensation geschützt. In this operating state, the output signals remain at the last measured values before the heating function was activated.