TROLL 9500 Operator's Manual - Geotech Environmental Equipment

Section 13: Dissolved Oxygen—OpticalMaintenance and StorageCleaning the Sensor Cap1. Leave the cap on the sensor!2. Rinse the sensor with clean water from a squirt bottle or spraybottle.3. Gently wipe with a soft cloth or brush if biofouling is present.4. If extensive fouling or mineral build-up is present, soak the capend in vinegar for 15 minutes, then soak in deionized water for 15minutes.Do not use organic solvents—they will damage the foil. Donot remove the cap from the sensor prior to brushing.After cleaning the sensor, perform a 2-point user calibration.Cleaning the Optical Window (Perform only if changing the cap)Remove the cap and gently wipe the window with the supplied lenswipe.Caution: Do not wet the lens area with water or any solution.Cleaning the Sensor BodyWith the sensor cap installed on sensor, gently scrub sensor body witha soft brush. Soak in vinegar and DI water to remove mineral depositsor extensive fouling as in step 4, above.StoragePrior to installation: Store in factory supplied container.Installed: The RDO sensor can be stored wet or dry. When installedwith other sensors, it may be useful to store all sensors in a moist environment.In-Situ supplies recyclable plastic calibration and storagesleeves, as well as calibration and storage vessels for this purpose.Replacing the Sensor CapThe sensor cap has a 1-year life after the TROLL 9500 instrumenttakes its first RDO sensor reading. Replacement caps are availablefrom In-Situ Inc. or your authorized In-Situ distributor.1. Pull the used sensor cap off of the sensor, without twisting.2. Remove the existing o-rings from the sensor.3. Use a lint-free cloth to remove any moisture from the sensor body.Note: Ensure that there is no moisture in the o-ring grooves.Avoid touching or cleaning the lens with anything other thanthe supplied lens wipe.RDO Sensor Summary• When a turbidity wiper is installed, be sure to pull the slack inthe RDO adapter cable back against the TROLL 9500 body soit will not interfere with the wiper’s rotation.• To calibrate the Basic sensors with RDO installed, fill the softplastic cal insert (it has an orange base) with calibration solution,slide it up around the sensors, including the RDO cable,and use the RDO restrictor as a support during calibration.• The RDO sensor will work properly only in port 1 or 3 of theTROLL 9500. Remember that a combination pH/ORP sensorwill operate properly only in port 1, and a turbidity wiper accessoryonly in port 3.• Basic sensors that require hydration (pH and pH/ORP) maybe stored in the calibration and storage sleeve for short periodsof time. For long-term storage, remove the RDO sensor—it isnot necessary to remove it from the adapter—with restrictorand nose cone. Attach the standard TROLL 9500 Cal Cup witha moist sponge in the bottom.• The RDO sensor and all TROLL 9500 materials are suitable formonitoring in low flow, groundwater, and surface water sites.4. Use your finger to apply a layer of lubricant around the o-ringgrooves. Place the o-rings on the sensor. Apply another thin layerof lubricant to the o-rings and grooves.Note: Do not transfer grease to the lens or sensor pins.5. Clean the lens on the sensor with the wipe provided in the kit andallow to dry thoroughly. Inspect for scratches or dirt.6. Remove the new cap from its sealed packaging and attach it tothe sensor, being careful to press firmly, without twisting, untilit seals over the probe body. Make sure that the o-rings are notpinched or rolled between the cap and sensor.7. Perform a 2-point calibration. No conditioning is required prior touse.TROLL 9500 Operator’s Manual 960095110 rev. 007 01/09