Siemens SITRANS LR 300, Instruction Manual, Page: 49 / 140

7ML19985CL02 SITRANS LR 300 – INSTRUCTION MANUAL Page 47
mm
mmm
Oper
ation
Analog Output
The SITRANS LR 300 can be programmed to provide an analog output (P200) of 4 to 20
mA, and for proportional or inverse span.
Programming
When the unit is put into PROGRAM mode, the analog output level holds its prior value
unless the mA output function is the common output or HART is the communication
protocol.
Run
The analog output responds in the following manner:
0 and 100% are percentage of full-scale reading (m, cm, mm, ft, in).
Volume
To program the unit for volume, set:
• operation (P001) to level 1 (see page 56)
• tank shape (P050) to a value other than
0
(see page 58)
• other volume parameters (P051 to P053) as required
To program the unit for ullage, set:
• operation (P001) to space 2 (see page 56)
• tank shape (P050) to a value other than 0 (see page 58)
• other volume parameters (P051 to P053) as required
Fail-Safe
When the Fail-Safe timer (P070) expires, the mA output responds as follows:
Fail-Safe Mode (071) Status (4 - 20) Status (20 - 4)
1 = high 22 2
2 = low 2 22
3 = hold hold hold
P001 = 1 (level)
P001 = 2 (space a.k.a. ullage)
P001 = 3 (distance)
SITRANS LR 300.book Page 47 Monday, June 10, 2002 7:18 PM