In-Situ Clark Cell Maintenance Kit for the TROLL 9500 Instrument - Manual (Page 2)

Due to continuing product development this information is subject to change without notice. Copyright © 2002-2005 by In-Situ Inc. All rights reserved.
1 800 4INSITU
(toll-free, US and Canada) or 970 498 1500
www.in-situ.com
Multi-Parameter Water Quality TROLL ®
0033202 rev. 005 9/05
TIP: It is not necessary to maintain the computer
connection; conditioning will continue as long as the
sensor remains installed.
DO SERVICE KIT
Catalog No. 33200: 1-mil membranes, 33440: 2-mil membranes
1
2 3 4
Install the DO
sensor in port 2
Pressure/Turbidity
(or plug)
Temperature Alignment mark
SENSOR INSTALLATION
Install the DO sensor in port 2 of the Multi-Parameter TROLL,
as shown in the drawing below.
• Remove any moisture or dirt from the port connector with a
swab or tissue before installing the sensor.
• Lubricate the sensor o-rings if they appear dry.
• Handling the sensor by the sides, not the tip, align the
mark on the side of the sensor with the mark on the port.
• Use the sensor insertion tool to press the sensor into the
port until you feel it dock with the connector at the bottom.
When properly inserted a small gap (width of the sensor
removal tool) remains between the widest part of the
sensor and the instrument body, for ease of removal.
CONDITIONING
Condition a new sensor or a new membrane as follows:
1. Put a little clean water in the Cal Cup and attach it loosely
to the instrument. Do not seal the Cal Cup; it should be at
ambient pressure during the conditioning period. The
membrane can be under or above the water level.
2. Connect the MP TROLL to a PC and establish a
connection in Win-Situ or Pocket-Situ.
3. Select the MP TROLL in the Navigation tree. All installed
sensors will be displayed.
Powering of the DO sensor begins as soon as the
software recognizes the DO sensor and displays it in the
Navigation tree. This starts the conditioning process.
We recommend that you allow the sensor to condition for at
least two hours before calibrating a new DO sensor, or a
sensor with a new membrane. Longer conditioning (four hours
or overnight) will shorten the calibration period.
GUIDELINES & PRECAUTIONS
•
The DO sensor will function properly only when installed in
port 2.
• Be sure to allow 2-4 hours of conditioning, preferably
overnight, before calibrating a new DO sensor, or a sensor
with a new membrane module.
• Avoid touching the membrane. Fingerprints and other
contaminants can change its properties and affect
measurements.
• Follow the DO calibration instructions in the Multi-
Parameter TROLL Operator's Manual.
• The slope of a properly functioning sensor as calculated during
the calibration process will typically be in the following ranges,
depending on the membrane thickness:
1-mil membrane: between 30 and 67 nA/(mg/L)
2-mil membrane: between 15 and 34 nA/(mg/L)
If the calculated value is much outside this range, allow for
additional conditioning and perform a recalibration. Or the
sensor may need servicing (see the front of this sheet).
• Be sure every port is occupied by a sensor or plug before
submersion.
• To remove the sensor, position the yoke of the sensor
removal tool at the point where the sensor meets the
sensor block and pry the sensor upward. Be sure the port
connector is clean and dry before placing a plug or
another sensor in the port.
• Storage: Up to a month: Store assembled with membrane
immersed in distilled water. Long-term: Remove the
membrane module, rinse well, cover membrane with
protective cap, and store dry.
• Inspect sensor o-rings when installing/removing the
sensor: apply grease if they appear dry; replace the o-
rings if they are worn or damaged.
• The sensor body and membrane module are stamped with
a date code and membrane thickness. You will need to
know the membrane thickness during calibration.