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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
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.
1. Select Measurement file from the Measurement menu:
Option
Storage mode
RAM time
FLASH time
Save in flash now
Auto save in flash
Purge data
20 English
Description
Select CO
, H
S or All disabled.
2
2
enter the actual concentration in the sample.
Description
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)
The delay between two recordings of measurement data.
The delay between two data file transfers from volatile memory into non-
volatile memory. The last data file erases the previous one. This option
is only available if the Auto save in flash box is checked.
Press this button to store measurement data in flash immediately. After
pressing this button, press OK to initiate the process. A warning screen
appears informing you that the operation can take up to 30 seconds.
Press Yes to continue or No to abort.
Check this box to save measurements in flash automatically.
Measurements are saved at regular time intervals as defined in the
FLASH time box.
Clear all data in the volatile and non-volatile memories.
interference option if a carbon
2
S
2
