TROLL 9500 Operator's Manual - Geotech Environmental Equipment

Section 3: Getting Started• Alternatively, you may click Accept to store the early values. TheAccept button becomes available when NOMINAL or STABLE isindicated for all 3 parameters.• If there is no polarographic D.O. sensor, the Quick Cal is complete.Go to step 14.If performing a Polarographic Dissolved Oxygen calibration,continue with steps 10-13.10. Polarographic Dissolved Oxygen: Before the D.O. segment ofthe Quick Cal Wizard starts, you will be asked how you want tohandle barometric pressure.11. To complete the calibration, expose the polarographicD.O. sensor to air: Without disconnectingthe cable, invert the probe so that themembrane at the tip of the sensor is in air andthe temperature sensor is immersed in fluid.This will probably require you to remove the endcap from the Cal Cup and pour some fluid out.While you have the cap off, remove any dropletson the membrane by blotting gently with aclean swab or the corner of a tissue. Re-attachthe end cap loosely to insure the volume is notpressurized.TIP: For proper venting, loosen the end cap until a smallhole in the threads near the o-ring is at least partly visible.12. In the DO calibration screen, select the membrane type, stampedon the membrane module (if not indicated, select 1-mil Teflon).13. Click Run to begin the stabilization.The display will continuously update as readings are taken andBarometric pressure is important in converting measurement ofD.O. concentration to percent saturation, and a value is requiredfor accurate calibration. If the TROLL 9500 cable is vented, anaccurate barometric pressure value can be read from the onboardbarometric pressure sensor. If the TROLL cable is non-vented,then a barometric pressure value should be entered manually.12Do one of the following in this screen:• If the TROLL 9500 is on vented cable now and will take measurementsusing vented cable, click No — and you may want tocheck the “Don’t ask me this again” box.• If the device is on vented cable now but will take measurementson non-vented cable, click Yes. In the Edit Barometric Channelscreen, check the box indicating non-vented cable for measurementsbut vented cable for calibration/programming.• If the device is on non-vented cable now and will take measurementson non-vented cable, click Yes. In the Edit BarometricChannel screen, check the box indicating non-vented cablefor measurements and enter a barometric pressure value. Forhelp, see Section 9, Monitoring Barometric Pressure.13compared against the stabilization criteria (see sidebar on theprevious page).14. When the sensor response is STABLE (or alternatively, when youaccept the nominal value), the Quick Cal procedure is complete.TROLL 9500 Operator’s Manual19 0095110 rev. 007 01/09