62
TROLL
9500
Operator’s Manual
0095110 rev. 007 01/09
Stirrer
Propeller
compartment
Battery com-
partment
Motor com-
partment
End cap
jl
off on
EFFECT OF TEMPERATURE ON CALIBRATION
The most successful calibrations reproduce field conditions as nearly
as possible, especially temperature. It is best to calibrate at the
expected field temperature.
RINSING
As a general guideline, we recommend you rinse the Cal Cup, the
front end of the MP TROLL 9500, and the installed sensors prior to
beginning calibration. This will remove trace contaminants or solutions
used in previous calibrations, and prepare the instrument for a clean
calibration.
A good way to do this is to fill the Cal Cup with water, attach to the
instrument, and shake vigorously. This may need to be done a couple
of times.
Rinse first in tap water, followed by a rinse with distilled or deionized
water.
Shake or wipe with a clean lint-free tissue to dry. It is not necessary to
dry thoroughly.
Some calibration procedures also recommend a rinse in the selected
calibration solution. In this case, drying is not necessary.
STIRRING
When to Stir?
The stirrer accessory should be used during a calibration procedure
if it will also be used during field use—for example, if the instrument
will be in stagnant or very slowly moving water. The more closely
CALIBRATIONCONDITIONSREmECTlELDCONDITIONSTHEMORESUCCESSFULTHE
calibration. This is especially important when calibrating the ISE sen-
sors (ammonium, chloride, and nitrate).
ISE sensors in close proximity to each other can sometimes create
interferences. Constant stirring can enhance the performance of the
ISE sensors.
Attaching the Stirrer for Calibration
To use the battery-powered stirrer for calibration, attach it to the MP
TROLL 9500 and Cal Cup as follows. See illustration C on the follow-
ing page.
1. Remove the restrictor (nose cone attached) from the MP TROLL
9500 and set it aside.
2. Remove the black end cap from the Cal Cup.
3. Screw the top of the stirrer (propeller end) to the bottom of the Cal
Cup (the end from which you just removed the end cap).
4. Fill Cal Cup to fill line with solution.
5. Attach Cal Cup/stirrer assembly to front end of MP TROLL 9500.
Starting the Stirrer
The stirrer is powered by two alkaline D-
cells (installed). To start the motor, tighten
the end cap.
The magnetic stir bar in the propeller
compartment will start to spin. The stir bar
is protected by a guard plate that may be
removed for cleaning if necessary.
TIP:
Should the stir bar not start spinning, try giving it a
gentle nudge by sliding a narrow tool such as a screwdriver
or key between the protective bars of the guard plate.
To turn the stirrer off, back off the end cap until the stir bar stops spin-
ning.
CALIBRATION PROCEDURES
Refer to the following sections for specific calibration procedures and
guidelines:
Quick Cal
Section 3
pH
Section
11
Conductivity
Section
12
Dissolved Oxygen (polarographic)
Section 13, first half
Dissolved Oxygen (optical)
Section 13, second half
ORP
Section
14
Ammonium
Section
15
Chloride
Section
16
Nitrate
Section
17
Turbidity
Section
18
AFTER CALIBRATION
When you finish calibrating with any method, the following happens:
s 4HENEWLYCALCULATEDCALIBRATIONCOEFlCIENTSAREWRITTENTOTHE
“smart sensor” memory.
s 9OUHAVETHEOPTIONOFVIEWINGTHECALIBRATIONREPORT4HEREPORT
may be viewed immediately after calibration, or at any time. See
Calibration History,
below.
s 4HESENSORSAREREADYTOTAKEMEASUREMENTS
SECTION 10: MONITORING WATER QUALITY: OVERVIEW