TROLL 9500 Operator's Manual - Geotech Environmental Equipment

Section 18: TurbidityWiper InstallationThe MP TROLL 9500 may be shipped with the optional wiper alreadyinstalled in port 3, as shown on the drawing below. If installation isnecessary, unpack and install the wiper in port 3 as follows.The turbidity wiper will function properly only wheninstalled in port 3.1. Remove the restrictor from the front end of the MP TROLL 9500.This allows access to the sensor block depicted in the drawingbelow.2. Use the sensor removal tool to remove the sensor orplug from port 3. Retain the plug for future use. Forbest access to port 3, you may need to remove sensorsor plugs from other ports as well.3. Check lubrication of the o-rings on the connector endof the wiper.sensorremovaltoolTIP: The wiper o-rings require generous lubrication beforeinstallation. New wipers will be lubricated at the factory. If theo-rings appear dry, apply apply a silicone lubricant before installation.4. Visually align the connector on the wiper with the connector at thebottom of port 3.5. Press firmly until you feel the wiper dock with the port connector.When properly inserted a small gap (width of the sensor removaltool) remains between the wiper body and the instrument body.6. Press the wiper into the bracket attached to the turbidity sensor.7. After installing a new wiper, we recommend you access wiper controlin the software while you can clearly see the wiper movement.Connect in software, select the wiper, and click Wipe to ensure thewiper passes over the turbidity sensor optics properly.Q:A:Wiper MovementWhat does the wiper do, and when is wiping necessary?The wiper helps keep the optical windows of the turbiditysensor clear of bubbles and debris during measurements.When the sensor is off, the wiper is parked in its “home”position over sensor port 4. When a turbidity measurement iscalled for—a manual reading, a scheduled reading during atest, while calibrating or profiling—the wiper makes a full 360degree sweep to clean the optics.Wiping is not needed when the instrument is hand-held forshort periods (Profiling). Gently swishing the MP TROLL inthe water should serve to dispel air bubbles.When the turbidity sensor is off—not taking a measurement—thewiper head is “parked” over port 4. When a turbidity measurementis requested, the wiper head passes over the optics, sweeping themclean, and returns to its parking place. One “wipe” consists of a 360°counter-clockwise sweep (viewed from the sensor end), as shown inthe drawing below. Wiping occurs automatically before turbidity readings—manualreads, profiling, calibration, and tests—that are morethan 15 seconds apart. If readings are less than 15 seconds apart, thewiper will wipe once, before the first reading.A single wipe may be initiated in the software when the instrumentis idle to clear the turbidity optics of bubbles or debris. The wiper’smovements are entirely software-controlled.TIP: 15 seconds are alotted for a wipe cycle. This time isgenerous to allow for slower wiper movement at very lowtemperatures.If readings—test, calibration, profiling—are more than 15 secondsapart, the turbidity sensor will be wiped automatically before eachreading. If readings are less than 15 seconds apart, the wiper willwipe the windows just once, before the first reading.Turbidity SensorDetector EmitterWiperbrack-2 3 4Install wiperin port 31TemperatureTROLL 9500 Operator’s Manual 1230095110 rev. 007 01/09