Oakton T-100 Instrucciones De Funcionamiento

Oakton
T-100 Waterproof Turbidimeter Operation Instructions
T-100 Turbidimeter T-100 Turbidimeter
Getting Started
This instrument operates on the nephelometric principle of turbidity
measurement and is designed to meet the criteria specifi ed in ISO
7027 and DIN 27027 standards.
Using a Phillips screwdriver, remove the screws from the battery cover
and install (4) AAA batteries (included). Tighten the screws to retain a
waterproof seal when completed.
Light Shield Cover Light Shield Cover Light Shield Cover
- for covering the vial
Keypad Functions
Powers on and shuts off the meter.
The meter automatically shuts off 20 minutes
after last key press.
Initiates the calibration mode.
Press during calibration mode to abort the
calibration and enter Standby "
When in measurement mode, the READ/ENTER key
is used to perform a measurement.
Single Measurements: When the key is pressed
and released immediately (less than 0.3 seconds),
the display will blink " " for 10 times and then
display the measured value.
Continuous Measurements: If the READ/ENTER
key is pressed and held, the instrument will perform
a continuous measurement during which the display
is updated every 2 seconds. This can be used for
indexing vials. (This function is not available in
calibration mode).
After the READ/ENTER key is released,
the instrument will automatically perform a
single measurement.
During calibration mode, these keys are used
to select the calibration point in an incremental/
decremental manner. Note: This meter uses an
auto incrementing feature, i.e. after the successful
calibration of one point it automatically selects the
next calibration point, or automatically exits the
calibration mode after the fourth calibration point.
See also "Restoring Factory Calibration".
Turbidity Calibration
The T-100 was calibrated and tested prior to leaving the factory. The
T-100 kit includes (4) primary standards (0.02, 20.0, 100
and 800 NTU) to verify the meter calibration or to recalibrate
the meter as needed. Before measuring samples for the fi rst
time, perform a meter calibration with the primary standards.
Four standard vials are included and labeled for each standard
level. 800 NTU (CAL 1), 100 NTU (CAL 2), 20.0 NTU (CAL 3),
0.02 NTU (CAL 4).
Place the light shield cover over the vial to keep stray light from
changing the calibration and sample measurement readings. In many
environments, the light shield is not required as the vial cap is able to
keep stray light from entering the sample well.
Indexing is not required due to the high quality of the glass vials.
Simply align the index mark (arrow) on the vial with the index mark
(arrow) on the meter.
Note: Do not shake the calibration standards as air entrapment
will introduce error. Do not allow the calibration standards to freeze
as this will cause permanent damage to the standards, making
them inaccurate.
Calibration Procedure
Preparing the Calibration Standard Vials
Ensure there are no scratches or marks on the glass vial. If there are
marks that could affect the turbidity measurement, select another vial.
Before using the standards for the fi rst time, rinse the inside of the
vial with a small amount of the same NTU standard that will be used
to fi ll that vial.
1. Gently pour about 5 mL from the 60 mL stock standard into the vial.
2. Cap and swirl the vial so the inside of the vial is fully rinsed with
Sample Vial the standard.
3. Pour the standard out of the vial and discard it.
Sample Well
4. Repeat steps 1 through 3.
Index Mark
5. Gently fi ll the vial using the 60 mL stock standard above the fi ll line
on the vial and cap the vial.
Liquid Crystal Display
6. Repeat this rinse and fi lling procedure for the other three vials.
Keypad
Note: The vial rinsing is critical for precision with the lower
NTU standards.
Use these calibration standard vials daily as a check, and
also periodically for calibration as needed. When the standard
reading of 20.0, 100, or 800 NTU drifts more than 10 % of the
standard's NTU value, the solution should be replaced with another
aliquot from the plastic bottle following the steps listed above.
Note: 0.02 NTU standard read back value should be <0.1 NTU.
Calibration Sequence
Place the CAL 1
standard into the sample
well and press "CAL"
CAL 1
800 NTU
" mode.
Blinks
Press ENTER to accept
Blinks
Place the CAL 2
CAL 2
standard into the
100 NTU
sample well
Press ENTER to accept
Blinks
Restoring Factory Calibration
1. With the meter off, press and hold s key.
2. Power on the meter using ON/OFF. Release s key when "
(User-Reset) appears in the display.
3. The display shows "
" ".
4. Use s or t key to choose "
5. Press READ/ENTER key to confi rm. When "
meter performs a reset, and will blink "
reading in measurement mode.
Turbidity Measurement
Insert vial containing
sample or calibration
standards before
powering on.
Alternatively, from
"
press READ/ENTER.
Calibration Standards Battery Indicator
Ready To Measure
Turbidity Measurement
Good techniques are important for accurate turbidity measurements.
For best results, use clean sample vials, properly position the vial in
the sample well, cover the vial with the light shield cover, use proper
handling of standards, use supplied cloth to keep vials clean and
scratch free, and perform meter calibration as needed.
Blinks
Preparation of Sample Vial
1. Obtain a clean, dry sample vial.
2. Handle the sample vial only by the cap to avoid fi ngerprints on
the glass.
3. Rinse the vial with approximately 10 mL of the sample, capping
Press ENTER to accept
the vial with the black screw cap and gently inverting it several
times. Discard the used sample and repeat.
Place the CAL 4
CAL 4 4. Fill the rinsed vial with the sample up to the mark indicated in the
standard into the
0.02 NTU
vial. Cap the vial with the supplied black screw cap.
sample well
5. Wipe the vial with the soft, lint-free cloth supplied. Ensure that the
outside of the vial is dry, clean and free from smudges.
6. Apply a thin fi lm of silicone oil (supplied) on the sample vial (see
image below).
7. Wipe with a soft cloth to obtain an even distribution over the entire vial's
surface. The purpose of oiling the vial is to fi ll small scratches and
to mask the imperfection in the glass. Do not apply large quantity
Blinks
of oil as this may collect dirt and dust.
8. The sample vial is now ready to be inserted into the sample well
for measurement.
Press ENTER to accept
Place the CAL 3
CAL 3
standard into the
20.0 NTU
sample well
" for about 2 seconds and then shows
" or " ".
= To restore meter back to factory calibration values
= To retain last calibrated values
" to indicate that it is
" mode,
Vial is currently Reading in (Nephelometric
Reading in Turbidity Units (NTU) is
displayed. "
measurement mode
message will occur if a
vial is not present.
Applying a thin
fi lm of silicon to
the sample vial
Fill line
"
" is selected, the
"X.X" is
software
revision
number
" error