BKI GO-36 Manuel de service Page 45

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 80
  • Table des matières
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 44
BKI 09 ATEX 0003X
htk4014a0600p_01.doc
45 / 80
Dead zone: configuration of user menu PCSTAR 2 function 1.1.2 (HART
®
Fct. 2.1.1.4)
The top dead zone is the minimum measuring distance between the gauge flange facing (the reference point) and the product. The various probes for the MicroTREK
2-wire have differing top dead zones and these are given in section 5.2.3: Probe measurement limits.
Why is configuration of the dead zone important?
The gauge will not display measurements taken here - the reading is blocked on reaching this zone.
This will avoid the gauge confusing the true level with a parasite (i.e. flange) as the product nears the tank fitting and thereby displaying a false reading. It should be
noted that although the reading is frozen, the gauge will continue to follow the reflection. The PCSTAR 2 F8-marker menu will display “Tank full” in this zone.
What is the difference between these functions:
PCSTAR 2 Fct 1.1.2/ HART® Fct. 2.1.1.4: Dead zone
PCSTAR 2 Fct 1.5.1/ HART® Fct. 2.1.5.3: Detection delay?
The “detection delay” function masks all signals (i.e. none are detected by the gauge) up to a defined distance from the flange facing. The detection delay zone size is
never greater than the dead zone size.
The PCSTAR 2 F8-marker menu will display “Tank full” and “Level lost” in this zone.
This is illustrated below – the value in the box is the displayed value:
1 Height of tank fitting
2 Detection delay (Fct.1.5.1=120 mm)
3 Dead zone limit (Fct.1.1.2=150 mm)
4 Emitted signal
5 Flange reflection (masked)
6 Masked zone (all signals here are ignored)
7 Level reflection outside dead zone – true level displayed
8 Level reflection inside dead zone – level at dead zone limit displayed
(frozen)
9 Level reflection inside detection delay zone – not detected by gauge
and level at dead zone limit displayed (frozen)
*(3) = 985 mm Dead zone configured limit in terms of level
Vue de la page 44
1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 79 80

Commentaires sur ces manuels

Pas de commentaire