In-Situ TROLL 9500 Operators Manual - Manual (Page 80)

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TROLL 9500 Operator’s Manual 0095110 rev. 007 01/09
Type Operating Range Cell Constant Range
Low 3 to 50,000 μS/cm 0.33 – 0.39 cm -1
High 70 to 200,000 μS/cm 4.4 – 5.8 cm -1
SENSOR INSTALLATION
The MP TROLL 9500 may be shipped with a conductivity sensor
already installed in port 4, as shown on the drawing below. If installa-
tion is necessary, unpack and install the conductivity sensor in port 4
as follows.
The conductivity sensor will function properly only when
installed in port 4.
1. Remove the restrictor from the front end of the MP TROLL 9500.
This allows access to the sensor block shown in the drawing below.
2. If there is a cap on the connector end of the sensor, remove it and
set it aside for future use.
3. Remove any moisture or dirt from the area around
port 4, then use the sensor removal tool to remove
the plug from the port. Retain the plug for future use.
4. Remove any moisture or dirt from the port connector
with a clean swab or tissue.
5. Check lubrication of the sensor o-rings.
TIP: The sensor o-rings require generous lubrication before
installation. New sensors will be lubricated at the factory. If
the o-rings appear dry, apply a silicone lubricant before installation.
6. Align the mark on the side of the sensor with the mark on the port.
7. Firmly press the sensor into the port until you feel it dock with the
connector at the bottom of the port. 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.
CALIBRATION
OVERVIEW
The conductivity calibration calculates the cell constant for the con-
ductivity sensor. A one-point calibration is sufficient. Best results will
be obtained if you calibrate with the solution for the range you expect
to measure, and at the temperature you expect during field use.
Nominal vs. Stable
To shorten the calibration time, you have the option to accept the
calibration when “Nominal” stability conditions are achieved. If the
early value is accepted, the calibration point will be designated “USER
SET” in the calibration report. If the calibration report indicates that
calibration was performed through to stability then the instrument will
operate as intended by In-Situ’s quality standards.
CALIBRATION SOLUTIONS (PRIMARY STANDARDS)
Potassium chloride (KCl) calibration solutions certified to N.I.S.T.
standards are supplied in the In-Situ Conductivity Calibration Kits.
The value on the bottle indicates the solution’s specific conductance
CONDUCTIVITY
Fresh water 147 μS/cm solution
Fresh to brackish water 1,413 μS/cm solution
Brackish water 12,890 μS/cm solution
Sea water 58,670 μS/cm solution
The standard conductivity calibration kit includes a quart each of 147
μS/cm, 1,413 μS/cm, 12,890 μS/cm and deionized water. Catalog No.
0032090. Solutions are available separately, and specialized kits are
available for fresh and salt water applications.
TIP: Most solutions are usable beyond their stated expiration
date, depending on storage conditions; however, the results
cannot be guaranteed. The 147 μS/cm solution should be
refrigerated.
Calibrating with Other Solutions
A custom solution may be used if its specific conductance value (in
Ê3CM
RECOMMENDED CALIBRATION FREQUENCY
Your own experience is the best guide to how often the conductivity
sensor will benefit from recalibration. Refer to the general guidelines
under “How Often to Calibrate” in Section 10, and to the tech note on
“Instrument Calibration.”
sensor
removal
tool
SECTION 12: CONDUCTIVITY
Conductivity sensor
goes here Pressure/Turbidity
(or plug)
Temperature
alignment mark