Instruction Manual
Alpha DO 500
27
5.5 Range Settings
The range settings allow you to map the Transmitter output current range (4-20 mA)
to dissolve oxygen reading range (Zoom window). You can define the lowest DO
reading of the Transmitter to 4mA (
LO
) and the highest DO reading to 20mA (
HI
).
The current output can then be connected to a chart recorder to plot the DO
variations.
Zoom Window
Unit of
Measurement
Default
Lower Limit (LO)
Default
Upper Limit (HI)
% saturation
0.00
199.9
ppm 0.00 19.9
mg/l 0.00 19.9
ENT
SETUP
HOLD
1
ENT
SETUP
HOLD
SETUP
HOLD
%
ENT
2
3
%
1
1
From measurement mode
press ENT key
to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(
COF
).
Press or key
to
select range settings screen (
SEt rng
).
Press ENT key
to access range settings (
SEt rng
).
2
Select lower limit
: The lower display shows ‘
LO’
. The upper display
shows the last configured lower limit, otherwise the default lower limit.
Press or key
to
adjust the upper display to desired value.
Press ENT key
to confirm the value.
3
Select upper limit
: The lower display shows ‘
HI’
. The upper display
shows the last configured upper limit, otherwise the default upper limit.
Press or key
to
adjust the upper display to desired value.
Press ENT key
to confirm the value. The Transmitter reverts to
SET rng
screen.
Press or key
to access other setup screens or
press and key
simultaneously
(escape) to return to measurement mode.
