50 of 138 Measurement Menu - Orbisphere 510/511/512 AnalyzersOperator ManualORBISPHERE4.2.5 Advanced Configuration4.2.5.1 EC Sensor4.2.5.2 TC Sensor⌧ Enable pressure sensor: Check as appropriate.See “External Pressure Calibration (optional sensor)”on page 65⌧ Enable negative concentration: Check as appropriate.See “O3 Sensor Calibration” on page 60⌧ TPO enable (portable instruments in “Sample mode”measurement only): Check if TPO calculation isrequired.⌧ TPA enable (portable instruments in “Sample mode”measurement only): Check if TPA calculation isrequired. If TPA is enabled, enter the TPA K coefficient ifdifferent from the displayed value.⌧ Enable ext. pressure sensor: Check as appropriate.See “External Pressure Calibration (optional sensor)”on page 65⌧ Enable negative concentration: Check as appropriate.⌧ Continuous purge during thermal cut off: If thermalcutoff has been enabled (see “MeasurementConfiguration” on page 47), then check this box toensure that a continuous purge of the TC sensor takesplace while the measurement session is suspendeddue to the thermal cutoff temperature value beingexceeded.Note:To manually set the TC sensor into a continuous purgemode, press the Continuous Purge button that isavailable from the Services - Diagnostic - Channel x -Amplifiers menu. See details in the section entitled“Amplifiers (TC sensor only)” on page 112.⌧ Offset and slope corrections: Enable correction asappropriate.If enabled, the correction values for offset and slopemust be entered. These values cannot be negative.⌧ Liquid to gas factor: Enable correction as appropriate.If checked, the percentage correction factor must beentered. This value cannot be negative.Note:If you believe you need to enable these corrections, it isadvisable to contact a Hach Ultra Service Representativefirst.
