Siemens SITRANS LR 300 Manuel d'instructions télécharger pdf (Page 81)

7ML19985CL02 SITRANS LR 300 – INSTRUCTION MANUAL Page 79

mmmmm

Parameters

If the SITRANS LR 300 displays a full level, or if the reading fluctuates between a high

level and a correct level, set this parameter to elevate the TVT in this region and to de-

sensitize the receiver from any ‘base noise’ caused by internal antenna reflections and/or

nozzle echoes.

Entry:

0 = Off (not used).

1 = Use Learned TVT. (See Learned TVT Curve, in Example: After False Echo

Suppression, above.)

2 = Learn.

Set Up:

1. Perform this function at low tank levels.

2. Determine distance from radar unit to liquid level.

3. Select P838 and set [distance to liquid level minus 0.5m].

4. Select P837.

5. Press 2 and then press ENTER . P 837 will revert to 1 (use Learned TVT)

automatically after a few seconds.

Notes:

• Press PROGRAM to toggle between RUN and PROGRAM mode.

• Press TOGGLE twice to open parameter fields.

Example After Auto False Echo Suppression

TVT curve

(Learned)

Liquid

level

False echo

SITRANS LR 300.book Page 79 Monday, June 10, 2002 7:18 PM

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 139 140

Pas de commentaire

Siemens SITRANS LR 300 Manuel d'instructions Page 81