Appendix
Installation guide 854 ATG
Page 21
Appendix C
ATEX approval
The terminal compartment of the 854 ATG level gauge has been ATEX approved as explosion-
proof and as being increased safe. The type of cable glands that must used:
For protection type increased safe
EEx e approved glands are to be used.
For protection type explosion proof
EEx d approved glands or conduit are to be used.
Connection requirements of optional boards
The identification label on the 854 ATG indicates whether your instrument is equipped with an
optional board with intrinsically safe measuring circuits.
XPU-2 board (i.s. option), [EEx ib] IIB
Output circuit for 977 TSI:
Max. values
: U = 21 V, I = 395 mA, P = 1.41 W
Max. permissible ext. inductance
: 0.8 mH
Max. permissible ext. capacitance : 1.27
µ
F
HCU option board, [EEx ia] IIB
Spot temperature input circuit:
Max. values
: U = 23.1 V, I = 221 mA, P = 0.19 W
Max. permissible ext. inductance
: 3.5 mH
Max. permissible ext. capacitance : 980 nF
HART input 1 circuit (for 762 VITO Interface):
Max. values
: U = 23.1 V, I = 90 mA, P = 0.52 W
Max. permissible ext. inductance
: 15 mH
Max. permissible ext. capacitance : 1.02
µ
F
HART input 2 circuit (for HART
7
pressure transmitters and/or external water probe):
Max. values
: U = 23.1 V, I = 148 mA, P = 0.86 W
Max. permissible ext. inductance
: 7 mH
Max. permissible ext. capacitance : 1.02
µ
F
GFC option board, [EEx ia] IIC
Fieldbus interface circuit
Max. values
: U = 24V, I = 380 mA, P = 5.32W
Max. permissible ext. inductance
: 6.5
µ
H
Max. permissible ext. capacitance : 1.8 nF