Orbisphere 510/511/512 Analyzers - Calibration Menu 63 of 138Operator Manual ORBISPHERE5.4 Calibration Errors (EC and TC sensors)Calibration is not possible in the following circumstances:• When the "ratio ideal current" is greater than 170% or smaller than 30%• When the sensor cannot measure (thermal cut off, sensor out, etc.)• When the "ratio ideal current" is greater than 150% or smaller than 50%, awarning is displayed but the calibration is valid.5.5 Interference Calibration (EC sensor)InstructionsUsing a flow chamber, expose the sensor to the H 2 source at the same barometricpressure that is shown on the display. Press Start to initiate the H 2 interferencecalibration.The hydrogen interference calibration is available for ECsensors measuring O 2 concentrations, and is requiredw h e n H 2 i n t e r f e r e n c e h a s b e e n e n a b l e d ( S e e“Interferences Configuration” on page 51). The lower partof the screen displays the actual measurement. Enter in the upper box the purity of the hydrogen thatis used for this calibration. A reasonably pure (e.g.99.8% or better) hydrogen source and an accuratepressure gauge are needed.⌧ Hold during calibration: Selected by default, this holdsthe measurement sequence to avoid storing invalidvalues.
