46
Measurement Menu
Advanced configuration - EC sensor
• Enable negative concentration: Check as appropriate. Refer to O3 sensor calibration on page 52.
Advanced configuration - TC sensor
• Enable negative concentration: Check as appropriate.
• Hold recovery time: This parameter defines the interval during which the outputs remain frozen after
the measurement is no longer on HOLD. Set the value to between OFF and 10 minutes, according to
the timing of your setup.
• Continuous purge during thermal cut off: If thermal cutoff has been enabled (refer to
Measurement configuration on page 44), 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. Refer to Amplifiers (TC
sensor only) on page 88 for detailed information.
• 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.
Oxygen interference 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.
• Select CO
2
, H
2
S or all disabled (see notes below).
• Select Chlorinity, Salt or disabled. For chlorinity or salt, it is required to enter the actual concentration
in sample.
Note 1: In some applications, like in the beverage industry, there can be high concentrations of CO
2
in the
sample. Hach Lange recommends to select “CO
2
interference” whenever a CO
2
concentration of over 1%
in gas phase, or 15 ppm in dissolved phase, is present.
Note 2: The detection of O
2
in the petroleum industry is sometime hampered by significant concentrations
of H
2
S in the sample. Hach Lange recommends to select “H
2
S interference” whenever the H
2
S
concentration exceeds 0.15% in gas phase, or 5 ppm in dissolved phase. To operate the O
2
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.
To Next Page
Loading...
