KROHNE ALTOSONIC V EEx EN - Manual (Page 8)

ALTOSONIC V 4
The second thermostat T2 is a bi-metal controlled thermoswitch that is set to ca. -20°C
switching temperature, meaning that when the air-temperature inside the flameproof box
exceeds -20°C, the contact closes. Thermostat T2 is connected in series with the live of the
five UFC 500…-EEx electronics units, so above an air-temperature of approx. -20°C, the five
UFC 500…-EEx units are provided with the supply power and start operating.
Installation, setting and checking of the right functioning of the heating element and the
thermostats T1 and T2 is done by KROHNE.
Optional heating for standard UFC-V/EEx
To prevent condensation inside the flameproof box of the standard version type UFC-V/EEx
can optionally be provided with a heating element of maximum 30 W. This heating element
can be delivered with a 24 Vdc or 110…240 Vac power supply. The element is controlled by
a thermostat of type T1, which is also used in the low-temperature version.
No changes are allowed by any third party (e.g. end user), except when they
are authorized and controlled by KROHNE personnel.