1: General Description
Portaflow 220 User Manual 5
(Issue 1.0)
Figure 1.4 Keypad
1.4.2 Keypad
The instrument is configured and controlled via a 16-key tactile membrane keypad, as shown in Figure 1.4.
ON/OFF Key
The ON/OFF key is shown on the top left of the keypad. When turned ON an initialisation screen is displayed
on the LCD showing the instrument’s serial number and software revision. Once this appears, the instrument
can be started by pressing the ENTER key once – the initialization screen is then replaced by a MAIN MENU
which provides access to the remaining functions.
Menus and the menu selection keys
The Portaflow 220 menus are arranged hierarchally 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 beyond the bottom visible item.
Menus generally ‘loop around’ if you scroll beyond the first or last items.
If you select Exit on any menu it usually takes you back up 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).
Dual function numerical keypad
The block of keys shown in the centre of the keypad in Figure 1.4 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. Some of the features accessed by these keys are restricted in the Portaflow 220
model range.
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