Hanna Instruments HI 8711 - Manual (Page 34)

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All LEDs above the keys indicate the state of each function, whether it
is active or the display is indicating the mode.
For HI 8711 only
Each LED can be in one of the following states:
A) Light on
The mode is displayed on the LCD but
is not active, e.g. the alarm setpoint is
displayed but the alarm contact is
open.
B) Light blinking 25% on, 75% off
The mode is not displayed but it is
active, e.g. the alarm contact is opened
but the alarm setpoint is not displayed.
C) Light blinking 75% on, 25% off
The mode is active and being displayed.
D) Light off The function is neither active nor
displayed.
LED INDICATION LED INDICATION LED INDICATION LED INDICATION LED INDICATION