VEGA 145 User Manual

VEGA Grieshaber KG
Am Hohenstein 113 Postfach 11 42 D-77757 Schiltach Phone 0 78 36/50-0 Fax 0 78 36/50-201
ia safety barrier type 145
TIB • Technical Information • Operating Instructions
Safety barrier
Technical Information
2 Type 145
Application
The ia safety barrier type 145 is used in conjunc­tion with a non-Ex-approved signal conditioning instrument for intrinsically and galvanically isolated supply at Ex-approved electrodes or Ex-approved pressure sensors in hazardous areas and for signal transmission.
Therefore Ex-approved transducers with oscillator can be connected to standard signal conditioning instruments (without Ex-approval) without breaking the explosion regulations.
Attention:
Safety barrier and signal conditioning instrument must not be installed in the hazardous area. It should be observed that the supply voltage of the signal conditioning instrument does not exceed 250 V.
Configuration
The electronics is located in a totally closed, welded plastic housing. On the top and the bottom of the front panel two clamp terminals for input and output circuit are located. The output circuit (to zone 0) is marked blue on the type plate.
An adapter is located on the rear for mounting on carrier rail TS 32 (C-rail) acc. to EN 50 035 or TS 35 x 7,5 (rail) acc. to EN 50 022 (snap-in fastening).
Function
The non intrinsically safe circuit of a signal condi­tioning instrument is galvanically isolated and converted into an intrinsically safe output circuit for transducers (electrode or pressure sensor with oscillator).
The safety barrier does not require any auxiliary energy. The energy required for operation is taken from the sensor circuit of the connected signal conditioning instrument.
Functional principle
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Ex-protective DC / AC Converter AC / DC Ex-protective circuit control unit control unit circuit
input output
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