In-Situ Turbidity Wiper - Manual

Multi-Parameter
Water Quality TROLL ®
Information Sheet
Catalog No. 0044510, 0044520, 0044530
(over)
Alignment
mark
1
2 3 4
Turbidity Sensor
Detector Emitter
P2
P1
P3 P4
Temperature
Install wiper in
port P3
Wiper
bracket
Fig. 2. Wiper properly installed
P2
P1
Fig. 3. Direction of wiper rotation
P2
P1
Fig. 1. The MP TROLL sensor block
TURBIDITY WIPER
INSTALLATION & MAINTENANCE
The turbidity wiper will function properly only when
installed in port P3.
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.
Do not attempt to move the wiper head by hand. Wiper
movement is software-controlled.
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.
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.
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.