Instruction manual

Instruction manual αlpha DO 2000
18
6.2 Offset, Salinity and Pressure compensation (OFS) sub-function
This mode allows you to change the offset parameter to make reading corrections without
removing the electrode from the control system. You can make adjustments of up to
±2.00ppm; ±2.00 mg/l; or ±10.0%. At the end of the offset adjustment, the salinity value,
followed by the pressure values (in mmHg or Pascal or PSI) respectively, is entered.
SETUP
HOLD
OFS
SETUP
HOLD
8.23
SETUP
HOLD
ENT
SETUP
HOLD
ENT
ENT
BAR
PRES
PRES
PRES
SETUP
HOLD
H9
SETUP
HOLD
PSI
SETUP
HOLD
H9
SETUP
HOLD
PSI
13.00
1.013
BAR
SETUP
HOLD
0.0
SAL
ppt
ENT
ENT
ENT
ENT
ENT
SETUP
HOLD
NO
OFS
OFS
ENT
SETUP
HOLD
YES
ENT
ENT
SETUP
HOLD
0.03
0.03
mg/l
mg/l
OFS
ENT
This page will be
skipped if offset is
equal to zero.
1. Select the “OFS” sub-function, and then press the ENT key.
2. Press the ▲ or ▼ key to select “NO” or “YES” for offset adjustment. Select “NO” and Press
the ENT key to skip offset adjustment and set salinity value. Select “YES” and Press the ENT
key to do offset adjustment.
3. Selecting offset value for the dissolved oxygen: The SETUP annunciator appears at the top
of the display. The lower display shows the current measured Dissolved Oxygen with its
respective units. The upper display shows the current offset value. Press the ▲ or ▼ key to
set the required offset. Press the ENT key to accept the offset value.
Note: The offset value is reset during full calibration (See section 5).
4. Setting the Salinity Value: the upper display shows the “salinity value” in ppt, while the lower
display shows “SAL”. Press the ▲ or ▼ key until the salinity value (between 0.0 ppt and 50.0
ppt, factory setting: 0.0 ppt) coincides with the correct salinity value. Press the ENT key to
confirm the Salinity value.
Note: This function is not available in the “%” mode and this window is not
displayed.
5. Setting the pressure value (mmHg or Pascal or PSI): The upper display shows “mmHg” and
the lower display shows “PRES”. Press the ▲ or ▼ key to select the unit of pressure mmHg
or BAR or PSI. Press the ENT key to accept the unit of pressure. Use the ▲ or ▼ keys to
set the correct pressure. Press the ENT key to confirm the pressure value.
Continue with additional Setup procedures, or return to the Measurement mode by pressing
the ▲ and ▼ key (escape) simultaneously.