Wiper
bracket
Turbidity Sensor
Detector Emitter
2 3 4
P2
P3 P4
1
P1
Alignment
mark
Multi-Parameter
Water Quality
TROLL
Information Sheet
Catalog No. 0044510, 0044520, 0044530
TURBIDITY WIPER
INSTALLATION & MAINTENANCE
DESCRIPTION
An optional accessory whose movement is software-controlled to help keep the
optical windows of the Multi-Parameter TROLL's turbidity sensor free of bubbles and
fouling. A bracket secures the wiper to the turbidity sensor and keeps it stable.
EEPROM chip enables wiper identification in software.
INSTALLATION
1. Remove the restrictor or Cal Cup from the front end of the MP TROLL. This allows
access to the sensor block depicted in Fig. 1.
2. Use the sensor removal tool to remove the sensor or plug from port P3. Keep the plug
for future use. You may need to remove other sensors or plugs to access port P3.
The turbidity wiper will function properly only when
installed in port P3.
®
Install wiper in
port P3
Fig. 1. The MP TROLL sensor block
Temperature
P2
P1
Fig. 2. Wiper properly installed
P2
P1
3. Check lubrication of the o-rings on the connector end of the wiper.
4. Align the mark on the side of the wiper body with the mark on the sensor block
beside port P3.
5. Firmly press the wiper into the port until you feel it dock with the port connector. When
properly inserted a small gap (width of the sensor removal tool) remains
between the widest part of the wiper and the instrument body, for ease of
removal.
6. Press the wiper into the spring-clip bracket attached to the turbidity sensor.
When an RDO® dissolved oxygen sensor is installed, be sure to pull
the slack in the RDO adapter cable back against the MP TROLL
body so it will not interfere with the wiper’s rotation.
WIPER MOVEMENT
When the turbidity sensor is off, the wiper is “parked” over port P4 (Fig. 2). When a
turbidity measurement is requested, the wiper head passes over the optics, sweep-
ing them clean, and returns to its parking place. One “wipe” consists of a 360°
counter-clockwise sweep (viewed from the sensor end, as shown in Fig. 3). Wiping
occurs automatically before turbidity readings—manual reads, profiling, calibration,
and tests—that are more than 15 seconds apart. If readings are less than 15 sec-
onds apart, the wiper will wipe once, before the first reading. A single wipe may be
initiated in the software when the instrument is idle to clear the turbidity optics of
bubbles or debris.
Fig. 3. Direction of wiper rotation
Do not attempt to move the wiper head by hand. Wiper
movement is software-controlled.
(over)
Multi-Parameter Water Quality
3
4
TROLL
®
TURBIDITY WIPER
Catalog No. 0044510, 0044520, 0044530
MANUAL WIPE
To perform a manual wipe while the MP TROLL is idle:
1. With the wiper installed in port P3 (as described on the front of this
sheet), connect the MP TROLL to a PC and establish a connection in
Win-Situ or Pocket-Situ.
2. Click to select the TROLL and display all parameters. The wiper will
appear in the Navigation tree along with other installed sensors.
3 Select the Turbidity Wiper in the Navigation tree.
4. Select Wipe in the Information pane. The wiper will pass once over
the turbidity sensor optics and return to its home position.
WIPER MAINTENANCE
The cotton wiper pad will require replacement periodically to maintain its effective-
ness in cleaning the turbidity sensor optics. The entire head may be replaced, or just
the pad. In either case, the wiper head will need to be removed. A hex wrench is
supplied for this purpose. You do not need to remove the entire wiper; leave the
wiper body installed in port P3.
Removing the Wiper Head
To remove the wiper head, use the supplied
hex wrench to loosen the set screw
ORDERING INFORMATION CATALOG NO.
Complete Wiper Kit ................... 0044510
Replacement Wiper Head ........ 0044520
Wiper Pad Replacement Kit ..... 0044530
TIP: 15 seconds are alotted for a full wipe of
the turbidity sensor optics. This time is
generous to allow for slower movement at
very low temperatures.
If readings are more than 15 seconds apart, the
turbidity sensor will be wiped automatically before
each reading. If readings are less than 15 seconds
apart, the wiper will wipe the windows just once,
before the first reading.
MP TROLL 9000 users: The turbidity
wiper is supported by TROLL 9000
hardware version 3.0 and higher,
firmware version 1.46 and higher. Do not
attempt to operate the wiper with earlier hardware/
firmware. The wiper with a white PVC head is not
supported by firmware versions after 1.39.
With the wiper parked over port P4, loosen the set screw on the wiper head until you
can grasp the wiper head and gently pull it out.
Replacing the Wiper Pad
1. Remove the wiper head as above. Remove and discard the used pad.
2. Insert a new pad into the slots with the smooth side facing out, and pull to
eliminate slack. Excess material may be trimmed close to the wiper head.
3. Place the head on the motor shaft with the pad facing down toward the sensors.
The button at the top of the shaft should be flush with the wiper head surface.
Tighten the set screw against the flat of the motor shaft. Be very careful not to
move the wiper head in a lateral direction by hand after tightening.
4. If convenient, do a manual wipe as described above to ensure the wiper passes
over the turbidity sensor optics properly.
GUIDELINES AND PRECAUTIONS
• The turbidity wiper will function properly only when installed in port P3.
• Do not attempt to move the wiper head by hand. Wiper movement is software-
controlled.
• For best results, install 3.6 V lithium D cells in the TROLL when running a wiper.
• Wiper pressure is properly set when the pad just brushes the sensor optics.
• Replace the pad when it becomes too soiled to clean the sensor optics.
• When an RDO optical dissolved oxygen sensor is installed, check to see that the
RDO adapter cable is pulled back out of the way of wiper movement.
• Refer to the Turbidity section of the Multi-Parameter TROLL Operator's Manual
for complete information on the turbidity sensor and wiper operation.
1 800 446 7488
(toll-free, US and Canada) or 970 498 1500 www.in-situ.com
Due to continuing product development this information is subject to change without notice. In-Situ and the In-Situ logo, Win-Situ, TROLL, BaroTROLL,
RuggedReader, RuggedCable, and RDO are trademarks or registered trademarks of In-Situ Inc., Fort Collins, CO, USA. Copyright © 2004 – 2007 by
In-Situ Inc. All rights reserved.
0044512 rev. 007 08/07
Loading...