TROLL 9500 Operator's Manual - Geotech Environmental Equipment

Section 10: Monitoring Water Quality: OverviewExtended Sensor SetThe Extended Sensor set includes:• Ammonium• Chloride• Nitrate• Turbidity (factory-installed)• RDO ® Optical Dissolved OxygenInstalling SensorsThe diagram below represents a head-on view of the “sensor block”in the front end of the MP TROLL 9500. There are four sensor ports,plus permanently installed pressure and/or turbidity and temperaturesensors. Pressure and turbidity sensors are optional—if your instrumentdoes not include one or both of these sensors, there will be apermanently installed plug in the port.Do not try to remove the pressure or turbidity sensor orpermanently installed plug.Although the sensor design permits any sensor to install into anysensor port without damage to either the sensor or the instrument,for proper functioning please insure that sensors are installed in theirintended ports, as shown in the diagram.To install sensors:1. Remove the restrictor or Cal Cup from the front end of the MPTROLL 9500. This allows access to the sensor block shown below.End view of sensor blockQ:A:Will a sensor work if installed in the wrong port?Physically, a sensor may be plugged into any port. However,a sensor that is detected in the wrong port for its type willgenerate an error message in the software. The messagewill let you know which port or ports the incorrectly installedsensor should be moved to.In this case, remove the offending sensor and install it in thecorrect port. Then “refresh” the device view in the softwareto update the display.2. Remove the cap or storage bottle from the sensor. Retain the capor bottle for future storage and protection of the sensor. If the connectorend is covered with a cap, remove it also.TIP: To ensure optimum membrane response for new ionselectiveelectrodes (pH, ORP, nitrate, ammonium, chloride),soak the sensor in calibration solution for at least 15 minutesand up to several days before calibration.3. Remove any moisture or dirt from the area aroundthe port where you will install the sensor, then use thesensor removal tool to remove the plug from the port.Retain the plug for use with fewer than 4 removablesensors installed.TIP: If you are installing a sensor in port 3 (the central port),install it first. This will make it easier to install sensors inother ports.sensorremovaltool4. Remove any moisture or debris from the connector in the bottom ofthe port with a clean swab or tissue.5. Check lubrication of the sensor o-rings.D.O. (polarographic)or ammoniumor chlorideor nitratePressure/Turbidity(or plug)ConductivityThe sensor o-rings require generous lubrication beforeinstallation. New sensors will be lubricated at the factory. Ifthe o-rings appear dry, apply a silicone lubricant beforeinstallation.RDOor pHor ammoniumor chlorideor nitrateor turbidity wiperpH/ORPor RDOor pHor ammoniumor chlorideor nitrateTemperaturealignment mark6. Align the mark on the sensor with the alignment mark on the correctport (see diagram), or visually align the sensor connector pinswith the port connector pins.7. Press the sensor firmly into the port until it is securelyseated. When properly inserted a small gap (width ofthe sensor removal tool) remains between the instrumentbody and the widest part of the sensor, for easeof removal.sensorinsertiontoolTROLL 9500 Operator’s Manual 590095110 rev. 007 01/09