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Description
Surface contact / tube contact temperature sensor
THERMASGARD® ALTF1
The THERMASGARD ® ALTF 1 surface/tube contact temperature measuring transducer is an electric contact thermometre for surface temperature measuring on solids, having at least one so-called contact area that is brought into contact with the surface to be measured.
The ALTF 1 with connecting cable and passive output determines the temperature of a medium flowing inside a pipe (e.g. the water temperature) by measuring the surface temperature. For tube contact, the ALTF 1 resistance thermometre includes a strap and an axial sensor tube. It is used for temperature detection on piping and tubes (e.g. cold and hot water), or on heating lines for heating system control.
Technical details
Measuring range
–35...+105 °C PVC
–35...+180 °C silicone
(Tmax NTC = +150 °C, Tmax LM 235 Z = +125 °C)
–35...+180 °C silicone
(Tmax NTC = +150 °C, Tmax LM 235 Z = +125 °C)
Process connection
endless strap and metal tightener
(included in the scope of delivery)
(included in the scope of delivery)
Insulating resistance
100 MΩ,
at +20 °C (500V DC)
at +20 °C (500V DC)
Strap dimensions
Ø = 13 - 92 mm (¼ - 3"), L = 300 mm
Protective tube
stainless steel, 1.4571, V4A,
including pre-bent contact plate
including pre-bent contact plate
Permissible air humidity
< 95 % RH, non-precipitating air
Protection class
III (according to EN 60 730)
Sensor
Ni1000Tk5000 (TCR=5000ppm/K)
Connection type
2-wire connection
Testing current
< 0.3 mA
sensor cable
PVC; 1.5 m, LiYY, 2 x 0.25 mm²,
ends stripped with wire end sleeves
ends stripped with wire end sleeves
Protection type
IP 65 (according to EN 60 529) humidity-tight stamped
IP 68 (optional watertight compound-filled) rolled
IP 68 (optional watertight compound-filled) rolled