Siemens SITRANS LR 300 Instruction Manual download pdf (Page 49)

7ML19985CL02 SITRANS LR 300 – INSTRUCTION MANUAL Page 47

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Operation

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)

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Siemens SITRANS LR 300 Instruction Manual Page 49