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RAE ppbRAE 3000 User's Guide - Geotech

RAE ppbRAE 3000 User's Guide - Geotech

ppbRAE

ppbRAE 3000 User’s GuideSpan 2 CalibrationA cylinder of standard reference gas (span gas) fitted with a 500cc/min. flow-limiting regulator or a flow-matching regulator is thesimplest way to perform this procedure.Note: This gas should be of a higher concentration than the gas usedfor Span 1 calibration.Choose the 500 cc/min. regulator only if the flow rate matches orslightly exceeds the flow rate of the instrument pump. Alternatively,the span gas can first be filled into a Tedlar bag or delivered through ademand-flow regulator. Connect the calibration adapter to the inletport of the instrument, and connect the tubing to the regulator orTedlar bag.Another alternative is to use a regulator with >500 cc/min flow butallow the excess flow to escape through a T or an open tube. In thelatter method, the span gas flows out through an open tube slightlywider than the probe, and the probe is inserted into the calibrationtube.At the Span Calibration menu, you perform a Span calibration. Youmay also go back to the Zero calibration menu or to the initialCalibration menu if you want to exit calibration.• Press [Y/+] to enter Span 2 calibration.• Press [N/-] to skip Span calibration and return to Zerocalibration.• Press [MODE] to exit Span calibration and return to the topcalibration menu.If you have pressed [Y/+] to enter Span calibration, then you will seethe name of your Span gas (the default is isobutylene) and the spanvalue in parts per million (ppm). You will also see this message thatprompts you:Please apply gas...4. Turn on your span calibration gas.44

ppbRAE 3000 User’s Guide5. Press [Y/+] to initiate calibration.Note: You may press [MODE] if you decide that you do notwant to initiate calibration. This will take you directly to theCalibration menu for Zero calibration.6. Span calibration starts a 30-second countdown and displaysthis message:Calibrating...During the Span calibration process, the instrument performs theSpan calibration automatically and does not require any action onyour part.Note: If you want to abort the Span calibration process, press [N/-] atany time during the process. You will see a confirmation message thatsays “Span is aborted!” and then the Zero calibration menu willappear. You can then proceed to perform a Zero calibration, performa Span calibration, or exit to the topmost Calibration menu.When Span calibration is complete, you will see a message similar tothis (the value shown here is for example only):Span 2 is done!Reading = 1000 ppmThe instrument then exits Span calibration and shows the Zerocalibration menu on its display.Note: The reading should be very close to the span gas value.45

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