Hytek ALPHA Technical Data Manual page 13

Release the calibration button when
4.
the totaliser display shows VER
followed by the version number on
the lower line of the display.
5. The lower line will show the following
in a looping sequence:
1 PULSE
channel pulser connected
2 PULSE CHANNEL - Two channel
pulser connected
REED PULSER - Reed switch pulser
connected
Press calibration button once when desired option is displayed.
Select 2 PULSE CHANNEL for Weights & Measures Alpha, REED
PULSER for Alpha fitted with PULS.E18 reed switch pulser (pre
August 2003) or Adblue Alpha and 1 PULSE CHANNEL for all other
Alpha versions.
6. The lower line will show the following
in a looping sequence:
LITRES – Display measures in litres.
GALLONS – Display measures in
gallons (Imperial or US)
Press calibration button once when
desired option is displayed.
7. The lower line will show the following
in a looping sequence:
BACKLIGHT ON – backlight on
constantly.
BACKLIGHT OFF – backlight off.
ON FOR FUELLING – backlight only
on during fuelling.
Press calibration button once when
desired option is displayed.
CHANNEL -
00000.0
CALIB
00000.0
Single
CALIB
00000.0
CALIB
00000.0
CALIB
VER 4.00
1 PULSE CHANNEL
LITRES
BACKLIGHT ON
S858/4