GB
11258421.09
01/2012
GB/D
WIKA operating instructions temperature transmitter T32.xS
41
10.3.2 Intrinsically safe supply and signal circuit
(4 ... 20 mA loop; terminal
⊕
und
⊖
)
Parameters
Model T32.xx.0IS
Model T32.xx.0NI
Gas hazardous
application
Dust hazardous
application
Gas hazardous
application
Terminals
+ / -
+ / -
+ / -
Voltage Ui
DC 30 V
DC 30 V
40 V
Strength of current Ii 130 mA
130 mA
23 mA *)
Power Pi
800 mW
750/650/550 mW 1 W
Effective internal
capacitance Ci
7.8 nF
7.8 nF
7.8 nF
Effective internal
inductance Li
100 µH
100 µH
100 µH
*) The maximum operating current is limited by the T32. The maximum output current of the
associated energy-limited apparatus does not have to be ≤ 23 mA.
The supply and signal circuit and the intrinsically safe
sensor circuit must be considered as galvanically
connected to each other.
10.3.3 Connection of the HART
®
modem/HART
®
communicator
(terminal
⊕
and
⊖
)
■
The sum of all voltages connected (supply plus output values
of the HART
®
modem and/or HART
®
Communicator) must not
exceed 30 V for T32.xx.0IS and 40 V for T32.xx.0NI.
■
The sum of the effective capacitances and inductances must not
exceed the maximum permissible value according to the required
equipment group (IIA up to IIC).
11. Maintenance
The temperature transmitter described in these operating instructions
is maintenance-free! The electronics are completely encapsulated
and incorporate no components which could be repaired or replaced.
Repairs must only be carried out by the manufacturer.
10. Notes for mounting, ... / 11. Maintenance