Supplementary Electronics; Switch-On Phase - Siemens SITRANS LG240 Operating Instructions Manual

Terminal compartment
Supplementary electron-
ics - Additional current
output
PBD-51041038
Fig. 17: Connection compartment - Ex-d-ia double chamber housing
1 Voltage supply, signal output
2 Ground terminal for connection of the cable screen
5.6

Supplementary electronics

To make a second measured value available for use, you can use the
supplementary electronics "Additional current output".
Both current outputs are passive and need a power supply.
Fig. 18: Terminal compartment, double chamber housing, supplementary elec-
tronics "Additional current output"
1 First current output (I) - Voltage supply and signal output, sensor (HART)
2 Additional current output (II) - Voltage supply and signal output (without
HART)
3 Ground terminal for connection of the cable screen
5.7

Switch-on phase

After connecting the instrument to power supply or after a voltage
recurrence, the instrument carries out a self-check for approx. 30 s:
•
Internal check of the electronics
•
Indication of the instrument type, hardware and software version,
measurement loop name on the display or PC
•
Indication of the status message "F 105 Determine measured
value" on the display or PC
•
The output signal jumps to the set fault current
SITRANS LG240 - Operating Instructions
4...20mA
+
1 2
( )
(-)
1
I
4...20mA
+
1 2
( )
(-)
3
1
2
I I
4...20mA
+
7 8
( ) (-)
2
25