Operation Modes - GF PF220 V2 Betriebsanleitung

Operating Instructions
3.6.2 Menus and the menu selection keys
The GF PF220/330 V2 menus are arranged hierarchically with the MAIN MENU being at the top level. Menu navigation is achieved
by three keys on the right hand side of the keypad which are used to scroll UP and DOWN a menu list and SELECT a menu item.
When scrolling through a menu an
arrow-shaped cursor moves up and down the left hand side of the screen to indicate the active
menu choice which can then be selected by pressing the ENTER (SELECT) key.
Some menus have more options than can be shown on the screen at the same time, in which case
the 'overflowed' choices can be brought into view by continuing to scroll DOWN past the bottom
visible item. Menus generally 'loop around' if you scroll beyond the first or last items.
If you select Exit it usually results in taking you back one level in the menu hierarchy, but in some cases it may go directly to the
'Flow Reading' screen.
Some screens require you to move the cursor left and right along the display as well as up and
down. This is achieved using keys 5 (scroll LEFT) and 6 (scroll RIGHT).
3.6.3 Dual function numerical keypad
The block of keys shown in the centre of the keypad are dual function keys. They can be used to enter straight-forward numerical
data, select the displayed flow units or provide quick
access to frequently required control menus.
3.7

Operation modes

The flowmeter can be set up to operate in one of four modes determined mainly by the pipe diameter and the type of transducer
set in use. The diagram below illustrates the importance of applying the correct separation distance between the transducers to
obtain the strongest signal.
Reflex mode
This is the mode most commonly used. The two transducers (U & D) are attached to the pipe in line with each other and the signals
passing between them are reflected by the opposite
pipe wall.
The separation distance is calculated by the instrument in response to entered data concerning the pipe and fluid characteristics
Upstream
Transducer
U
Fluid Flow
Reflex mode (double bounce)
In this mode the separation distance is calculated to give a double bounce*. This is most likely to occur if the pipe diameter is so
small that the calculated reflex mode separation distance would be impractical for the transducers in use.
U
Fluid Flow
Reflex mode (triple bounce)
This mode goes one step further to show a triple bounce situation. This would normally apply when working with very small pipes
relative to the transducer range in use.
U
Fluid Flow
Separation
Distance
D
Separation
Distance
D
Separation
Distance
D
Design and function
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