Hach ORBISPHERE K1200 User Manual

Also see for ORBISPHERE 510: User manual Basic user manual

Contents

56Calibration Menu7.3 Zero calibration7.4 100% humid air calibration (high range sensors only)7.5 High level adjustment7.6 Sensor verificationZero calibrationWith this method, the sensor should be removed from the sample and exposed to pure N2 gas. It isrecommended to use the specially designed portable calibration device for this purpose. Refer toCalibration devices on page 36.Press Start to start the calibration.A screen is displayed showing the measured values and length of time the sensor has been undercalibration. These values are continually refreshed.The value % last calibration displayed in the top box is an informational message showing thedifference between the current and previous sensor calibrations.The Signal within range and Stability reached boxes in the top right corner indicate whether thecalibration is within acceptable limits. When both boxes indicate YES, press Finish to accept the newcalibration. A confirmation screen then asks to accept and store the new parameters.If one or both boxes show NO, you can still perform a calibration but it is not recommended, and thecalibration should be aborted by pressing the Cancel button.In the case of a calibration failure, attempt a second calibration after about 5 minutes. If the secondattempt also fails, then refer to your Hach representative for advice.Note: If the Auto-End parameter is set (refer to Calibration configuration on page 55), then the calibrationwill be deemed successful when the parameters defined in Stop parameters are met. You will then beasked to confirm the calibration.If you have not accepted or cancelled the calibration after an elapsed time of 10 minutes then theprocess will time-out, a warning message will be displayed.In 100% humid air calibrationWith this method, the sensor should be removed from the sample and exposed to air saturated withhumidity. Do this by putting a drop of water in the calibration cap before installing the cap on the sensor.Press Start to start the calibration. The process is then the same as for the zero calibration describedpreviously.High level adjustmentNote: Before using this option, ensure a zero calibration has been successfully completed first.This calibration exposes the sensor to a gas or a liquid sample with a known gas concentration. You alsohave the option to reset the sensor’s calibration parameters to factory settings (from drop-down list forCal. sample).Press Start to start the calibration. The process is then the same as for the zero calibration describedpreviously.Sensor verificationSimilar to the calibration procedure, but used for verifying the calibration values. The results of themeasurements made during the verification are not stored and the calibration data is not modified.