Hach Orbisphere 510 Manuel D'utilisation De Base page 19

Option
Continuous purge
during thermal cut off
Offset and slope
corrections
Liquid to gas factor
7.3.6 Interferences configuration
These options are available to take into account the influence of some components or gases in the
sample during measurement. All available interference corrections are disabled by default.
The following interference corrections are available:
• For oxygen measurements - CO
Note: If you believe you need to enable any of the above, it is advisable to contact a Hach Lange Service
Representative first.
7.3.6.1 Interferences in oxygen measurement
In some applications, like in the beverage industry, there can be high concentrations of carbon
dioxide in the sample. Hach Lange recommends using the CO
dioxide concentration of over 1% in gas phase, or 15 ppm in dissolved phase is present.
In the petroleum industry, the detection of oxygen is sometimes hampered by significant
concentrations of hydrogen sulfide in the sample. Hach Lange recommends using the H
interference option if the hydrogen sulfide concentration exceeds 0.15% in gas phase, or 5 ppm in
dissolved phase. To operate the oxygen sensor in these conditions requires using a different
sensor and electrolyte. When using this mode your system will experience sensitivity loss of about
50 times higher than the minimum sensitivity for the membrane.
1. Proceed as follows:
Option
CO2 or H2S
Chlorinity/Salinity Select Chlorinity, Salt or All disabled. For chlorinity or salt, it is required to enter the
7.3.7 Measured data storage
There is one measurement file which contains the data generated by the measurement cycle. The
measurement file is updated in volatile memory and regularly copied in non-volatile memory (file
back-up). At start up the measurement file in volatile memory is updated with the file from the non-
volatile memory.
Note: Data stored in volatile memory is lost when instrument is powered off; non-volatile memory is permanent. In
case of an accidental power off event the instrument resumes measurement storage after the last measurement
stored in flash.
Description
If thermal cutoff has been enabled (see
then check this box to ensure that a continuous purge of the TC sensor takes place
while the measurement session is suspended due to the thermal cutoff
temperature value being exceeded.
Note: To manually set the TC sensor into a continuous purge mode, press the
Continuous Purge button that is available from the Services - Diagnostic -
Channel x - Amplifiers menu.
Enable correction as appropriate. If enabled, the correction values for offset and
slope must be entered. These values cannot be negative.
Enable correction as appropriate. If checked, the percentage correction factor must
be entered. This value cannot be negative.
Note: If you believe you need to enable these corrections, it is advisable to contact
a Hach Lange Service Representative first.
, H S, Chlorine, Salt
2 2
Description
Select CO , H S or All disabled.
2 2
actual concentration in the sample.
Measurement configuration
interference option if a carbon
2
on page 17),
S
2
English 19