45
Thermo Scientific Orion Star A213 Benchtop and Star A223 and Star A323 Portable RDO/DO Meter Reference Guide
Appendix 1 Advanced Meter Features
Dissolved Oxygen Barometric Pressure Compensation
5IF0SJPO4UBS"BOE4UBS"TFSJFT3%0%0NFUFSTIBWFBOJOUFSOBMCBSPNFUFSUIBUJTVTFEGPSQSFTTVSF
compensated dissolved oxygen readings. The meter can also use manual barometric pressure compensation if
dissolved oxygen is measured with a submerged probe or in a pressurized vessel. The pressure must be entered
BTNN)H
1 mm Hg = 0.03937 inch Hg = 1.3332 hPa (mBar) = 0.01934 PSI.
Dissolved Oxygen Salinity Correction
"VUPNBUJDTBMJOJUZDPSSFDUJPOGPSEJTTPMWFEPYZHFOSFBEJOHTSFQPSUFEBTNH-JTBWBJMBCMFPOUIF0SJPO4UBS"Q)
*4&DPOEVDUJWJUZ3%0%0NFUFSUIBUIBTCPUIEJTTPMWFEPYZHFOBOEDPOEVDUJWJUZNFBTVSFNFOUNPEFT5IFNFUFSVTFT
the conductivity value read by the conductivity cell to calculate the salinity correction factor and applies the factor to
EJTTPMWFEPYZHFOSFBEJOHTSFQPSUFEBTNH-
.BOVBMTBMJOJUZDPSSFDUJPODBOCFVTFEGPSEJTTPMWFEPYZHFOSFBEJOHTSFQPSUFEBTNH-POBMM0SJPO4UBS"
BOE4UBS"TFSJFT3%0%0NFUFST5IFNBOVBMTBMJOJUZDPSSFDUJPOGBDUPSNVTUCFFOUFSFEBTQQU QBSUTQFSUIPVTBOE
Conductivity
at 20 °C
(mS/cm)
Salinity
Correction
Value (ppt)
Conductivity
at 20 °C
(mS/cm)
Salinity
Correction
Value (ppt)
Conductivity
at 20 °C
(mS/cm)
Salinity
Correction
Value (ppt)
3
13
21
22
8
23
38
28
11
18
12
8
18
32
13
8
28
33
21
31
22
38
11
32
22
18
12
33
23
13
5IJTUBCMFXBTDBMDVMBUFEGSPNUIF*OUFSOBUJPOBM0DFBOPHSBQIJD5BCMFT7PM/BUJPOBM*OTUJUVUFPG0DFBOPHSBQIZPG
(SFBU#SJUBJO8PNMFZ(PEBNJOH4VSSFZ&OHMBOEBOE6OFTDP1BSJT
