Thermo Fisher Scientific ECScan High/Low & TDScan High/Low - Manual (Page 8)

68X247752 11/00 Rev 0
TDS Testing
1. Remove electrode cap. Switch unit on (ON/OFF
key).
2. Dip electrode into test solution. Make sure sensor
is fully covered.
3. Wait for reading to stabilize (Automatic
Temperature Compensation cor rects for
temperature changes). Note reading.
4. Press ON/OFF to turn off tester. Replace electrode
cap. Note: Tester automatically shuts off after
8.5 minutes of non-use.
HOLD Function
Press HOLD key to freeze display. Press HOLD again
to release.
Setting TDS Factor
This tester lets you select a TDS factor of 0.4 to 1.0.
1. Open battery compar tment. With meter on,
press the HOLD key, the press the INC key
See Diagram 1.
2. Press the INC or DEC key to adjust the TDS factor.
3. After 3 seconds without a key press, the display
flashes 3 times, then shows ‘ENT’. Tester accepts
TDS factor and returns to measurement mode.
4. Replace battery cap.
Self-Diagnostic Messages
bAt Weak batteries–replace with fresh ones specified
by manufacturer.
Err Wrong keypress.
Or, Ur Over range/Under range signal, or electrode
is not in contact with solution, or electrode is failing.
---- Calibration mode activated but not performed.
Before You Begin
Remove electrode cap. Soak electrode for a few
minutes in alcohol to remove oils.
Calibration
Tester is factory calibrated. However, to ensure
accuracy, calibrate TDS on a regular basis.
Select a calibration standard appropriate for the
TDScan Low tester (between 200 ppm and
1990 ppm). It is best to select a standard
close to the test solution value.
1. Open battery compartment lid (end with
lanyard loop).
2. Orientate the battery compartment as
shown in Diagram 1.
3. Rinse electrode in deionized water, then
rinse it in calibration standard, then dip it
into a container of calibration standard.
4. Switch unit on (ON/OFF key). Wait
several minutes for display to stabilize.
5. Press the INC or DEC keys to adjust
reading to match the calibration
standard value.
6. After 3 seconds without a key
press, the display flashes 3 times,
then shows ‘ENT’. The tester accepts
calibration value; returns to
measurement mode.
7. Replace battery cap.
WP TDScan Low Instructions