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U414_UxA_Bt_e_220802
1/5
Instruction Manual
UFA-Ex-d FA Di, ZS, TS
(UFA)
UVA-Ex-d VA Di or VA40
(UVA)
UTA-Ex-d TA Di or TA10/15
(UTA)
with transducer processing unit in a flameproof enclosure
Apparatus
Vane wheel flow sensors, vortex flow sensors and thermal flow sensors, as probe or measuring tube with
transducer processing unit in a flameproof enclosure with optional LCD display.
These are intrinsically safe sensors for measuring the flow velocity and the flow rate (standard flow velocity
and standard flow rate in the case of UTA) of gases (UFA, UVA, UTA) and liquids (UFA only) with a non-
intrinsically safe transducer processing unit in a flameproof enclosure. They are designed for use in areas in
which category 1 apparatus is required. Assembly is carried out either with flange or probe guide piece in
the zone partition. The electronics housing is located in areas which require category 2 apparatus.
1. Safety Precautions
Please read this Instruction Manual carefully before initial operation!
Non-compliance can cause an explosion!
The apparatus may be installed only in category 1/2G and 2G or 1/2D and 2D areas in which the ambient
temperature range of -20 to +60 °C or -40 to +60 °C for the TT (cryogenic) version for the electronics
housing, as marked on the type plate and in the corresponding technical documents, is not exceeded. With
the TT version the terminal clamps must not be used at temperatures below -20 °C!
The temperature of the medium in category 1/2G areas must not 60 °C under atmospheric pres-
sure. For UFA and UVA, the maximum admissible temperature of the medium in category 2G areas corre-
sponds to the temperature class. For UTA, the maximum admissible temperature of the medium in category
2G areas for temperature class T4 corresponds to 130 °C, and for temperature class T3 … T1 140 °C.
See also details on the type plate as well as in the corresponding technical documents.
For UFA and UVA in category 1/2D and 2D areas self-heating need not be considered. For UTA, the addi-
tional maximum surface temperature in category 1/2D and 2D areas is 135 °C. For maximum temperature
of the medium refer to the type plate and corresponding technical documents.
The gas container for the medium is to be insulated in such a way as to ensure that the electronics housing
of the apparatus does not take on temperatures exceeding the above mentioned maximum ambient tem-
peratures, taking radiant and convective heat into account.
Sensors may be used only in areas in which the temperature of the gas medium, the ambient temperature,
the maximum admissible overpressure, as specified on the type plate, are not exceeded.
For applications in pressurized pipelines sensors are to be inserted or retracted in depressurized conditions
only. Non-observance can result in serious harm to personnel.
The cover of the flameproof enclosure which is furthest away from both cable glands may only be opened in
the safety zone or when disconnected.
