Thermo Fisher Scientific EcoScan DO 6 - Manual (Page 34)

Instruction Manual DO 6
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5.3 Taking Pressure/Salinity Compensated DO
Measurements
In taking pressure and salinity compensated DO measurements, the pressure
and salinity values of your measurements need to be adjusted from the Set Up
menu. The pressure setting adjustment feature is available when Set Up menu
is derived from the % Saturation mode, mg/L (ppm) Concentration mode or
Temperature mode. Salinity setting feature, on the other hand, will only be
available when Set Up menu is derived from the mg/L (ppm) Concentration
mode. See Section 7.1- Advanced Setup Overview for more information.
During measurement, the DO meter will automatically compensate for salinity
and pressure based on the values entered in the Set Up Menu. The meter is
factory set at 760 mm Hg (101.3 kPa) barometric pressure setting and a salinity
factor of 0.0 ppt.
5.3.1 Pressure Setting Adjustment
(See Figure 16 for flow chart explanation)
1) Switch off your meter in mg/L (ppm) Concentration mode.
2) While pressing and hold the MODE key, switch on the meter by pressing
the ON/OFF key.
3) Once the ON/OFF key is released, the meter will enter the Set Up menu by
displaying “SEt.P”. By releasing the MODE key, the display will show the
configuration menu “COF.1”. See section 7 – Advanced Setup Functions.
4) Press the ▲ and ▼ keys to scroll through the Set Up main group menu till
the display shows “DPr.7”.
5) Press the HOLD/ENTER key and the meter will enter the barometric
pressure units selection menu with the display showing one of two; either
“A.HG” for mm Hg or “A.PA” for kilo Pascal, depending on what the meter’s
last set up was.
6) Use the ▲ and ▼ keys to toggle between the two units of pressure
measurement and press the HOLD/ENTER key to confirm selection.