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

Connection compartment
Supplementary electron-
ics - Additional current
output
24
Fig. 15: Connection compartment - Ex-d-ia double chamber housing
1 Voltage supply, signal output
2 Ground terminal for connection of the cable screening
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. 16: 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 screening
5.7

Switch-on phase

After connection of the device to power supply, the device first carries
out a self-test:
•
Internal check of the electronics
•
Indication of the status message "F 105 Determine measured
value" on the display or PC
•
The output signal jumps briefly to the set fault current
Then the actual measured value is output to the signal cable. The
value takes into account settings that have already been carried out,
e.g. default setting.
SITRANS LG240 - Operating Instructions
4...20mA
+
1 2
( )
(-)
1
I
4...20mA
+
1 2
( )
(-)
3
1
2
I I
4...20mA
+
7 8
( ) (-)
2
PBD-51041037