Thermo Orion Star, Руководство пользователя

Страница: 45 / 111

VIII-3
Orion Star Series Meter
Thermo Electron Corporation
Dissolved Oxygen Technique
Special Features
Before beginning DO setup, note these special features:
• The resolution selection automatically engages the Orion Star Series’ SMART
STABILITY™ & SMART AVERAGING™ algorithms to optimize the accuracy,
precision, and response of the DO measurement .
• Orion Star Series meters include an internal barometer for pressure
compensation . In general we recommend using the internal barometer, but you
may wish to use manual pressure compensation if you are measuring DO with
a submerged probe or in a pressurized vessel where the probe is exposed to
higher pressures than the meter .
• DO Manual Pressure Setting screen will only appear if Manual Barometric
Pressure compensation has been selected . The pressure in entered in mm
of Hg (Mercury) . See the following table to convert from other units of
pressure .
hPa (mBar) mm Hg (torr) Inches Hg lbf/in2 (PSI)
1 hPa (mBar) 1 0.75006 0.02953 0.014504
1 mm Hg (torr)
1.3332 1 0.039370 0.019337
1 Inches Hg 33.864 25.400 1 0.491154
1 lb/in2 (PSI)
68.9475 51.7149 2.03602 1
Example: To convert 14.7 PSI to mm Hg, multiply 14.7 by 51.7149 to get
760.21 mm Hg.
s
• Automatic DO Salinity Correction Selection is only available on 4-Star and 5-Star
meters designed to measure conductivity as well as DO . On these meters, the
instrument automatically takes the conductivity reading to calculate the salinity
correction factor then applies that to the DO measurement .
• A conductivity probe must be used in addition to the DO probe for automatic
salinity correction .