7
VEGAPULS 61
37991-EN-200303
Indicating and adjustment circuit: (termi
-
nals 5, 6, 7, 8 in electronics compartment
or plug connection; with double chamber
housing version in the connection com-
partment)
In type of protection intrinsic safety Ex ia IIC
For connection to the intrinsically safe circuit of the
associated external indicating unit VEGADIS 61/81
(PTB 02 ATEX 2136 X).
The rules for the interconnection of intrinsically safe
circuits between VEGAPULS PS61(*).C****P/K/F/L****
and the external indicating unit VEGADIS 61/81 are
fulfilled, provided that the total inductance and total ca
-
pacitance of the connection cable between VEGAPULS
PS61(*).C****P/K/F/L**** and the external indicating unit
VEGADIS 61/81 L
cable
= 310 µH and C
cable
= 2 µF are not
exceeded.
When using the delivered VEGA connection cable
between VEGAPULS PS61(*).C****P/K/F/L**** and the
external indicating unit VEGADIS 61/81, the following
listed cable inductances L
i
and cable capacitances C
i
must be taken into account with a cable length ≥ 50 m.
•
L
i
' = 0.62 µH/m
•
C
i
'
wire/wire
= 132 pF/m
•
C
i
'
wire/screen
= 208 pF/m
•
C
i
'
screen/screen
= 192 pF/m
Circuit of the display and adjustment
module: (spring contacts in the electron
-
ics compartment; with double chamber
housing version also in the connection
compartment)
In type of protection intrinsic safety Ex ia IIC
Only for connection to the display and adjust-
ment module PLICSCOM or VEGACONNECT
(PTB 07 ATEX 2013 X).
With the double chamber housing version, the display
and adjustment module may be mounted either in the
electronics compartment or in the termination compart-
ment.
For applications requiring instruments of category 2G, the intrinsically safe power supply and signal
circuit can correspond to protection class ia or ib. For connection to a circuit with protection class ib,
the ignition protection type identification is Ex ib IIC T6.
For applications requiring instruments of category 1G or 1/2G, the intrinsically safe power supply
and signal circuit must correspond to protection class ia.
For applications requiring instruments of category 1G or 1/2G the VEGAPULS PS61(*).C****P/K/
F/L**** is preferably connected to appropriate equipment with galvanically isolated, intrinsically safe
circuits.
The metal parts of the level measuring instruments on radar basis type VEGAPULS PS6* are electri
-
cally connected to the earth terminals.
In the versions of the radar sensors VEGAPULS PS61(*).C****P/K/F/L**** the intrinsically safe
circuits are electrically isolated from elements that may be earthed.
5
Application conditions
The max. permissible ambient temperatures depending on the temperature classes are specified in
the following tables.
For assessment and reduction of the explosion risk, valid standards such as for example EN 1127-1
must be taken into account.
