Supplementary Electronics; Switch-On Phase - Siemens SITRANS LG250 Operating Instructions Manual
Guided wave radar, 4...20 ma/hart - two-wire coax probe with sil qualification
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Also See for SITRANS LG250:
- Operating instructions manual (92 pages) ,
- Operating instructions manual (92 pages) ,
- Operating instructions manual (76 pages)
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Supplementary electron-
ics - Additional current
output
24
Contact pin
Pin 2
Pin 3
Pin 4
5.7
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.
The additional current output (II) cannot be used in safety-instrument-
ed systems according to SIL.
Fig. 18: Terminal compartment, double chamber housing, supplementary elec-
tronics - additional current output
1 Current output (I) - Voltage supply of the sensor and signal output (with
HART)
2
Additional current output (II) - Voltage supply and signal output (without
HART)
3
Ground terminal for connection of the cable screen
5.8
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
As soon as a plausible measured value is found, the corresponding
current is outputted to the signal cable. The value corresponds to the
actual level as well as the settings already carried out, e.g. factory
setting.
SITRANS LG250 - Operating Instructions
Colour connection ca-
ble in the sensor
White
Blue
Black
I
4...20mA
+
1
2
( )
(-)
3
1
Terminal, electronics
module
6
7
8
I I
4...20mA
+
7
8
( )
(-)
2
PBD-51041387
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