Hach-Lange ORBISPHERE 410 Basic User Manual - Manual (Page 18)

Option Description
Offset and slope
corrections Enable correction as appropriate. If enabled, the correction values for offset and
slope must be entered. These values cannot be negative.
Liquid to gas factor 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.
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
2
, H
2
S, Chlorine, Salt
Note: If you believe you need to enable any of the above, it is advisable to contact a Hach Lange Service
Representative first.
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
2
interference option if a carbon
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
2
S
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 Description
CO2 or H2S Select CO
2
, H
2
S or All disabled.
Chlorinity/Salinity Select Chlorinity, Salt or All disabled. For chlorinity or salt, it is required to enter the
actual concentration in the sample.
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.
1. Select Measurement file from the Measurement menu:
Option Description
Storage mode Select No storage if data storage is not required. Select Store once to start
recording measurements. When the volatile memory is full the recording of
measurement stops. Select Rolling buffer for continuous recording of
measurements. When the volatile memory is full the latest measurement set
replaces the oldest one (first-in, first-out)
RAM time The delay between two recordings of measurement data.
18 English