LaMotte Tracer 1741 Manual page 14

Erratic LCD
display
Unexpected
readings
Display frozen
Steady "-1 "
display
If the meter will not calibrate or displays a -1, reset the meter and attempt
to re-calibrate.
1. Turn off the meter.
2. Remove the battery cartridge from the top of the meter.
3. Press the ON/OFF button for 10 seconds to bleed off all charges
within the meter.
4. Re-insert the batteries and turn the meter on.
5. Follow the pH Calibration procedure.
¬ If the unit appears to be locked (display frozen) it is possible that the
Data Hold mode has been inadvertently accessed by pressing the
MODE button. Press the MODE button again or turn the meter off and
restart if the display appears frozen.
¬ If the meter does freeze and no button presses revive it, remove the
batteries, press the ON button for 10 seconds and then reinsert the
batteries.
¬ If the batteries are removed, any stored readings will be discarded and
the user calibration data for pH will be cleared. New user pH calibration
data is required. However, factory calibration data will be retained.
14
Samples have low ionic
strength (lack salt);
e.g. distilled, deionized,
boiled, lake water (high
pressure)
Buffers
Buffers
HOLD function
Button response
Wait
For each 50 mL of sample add
1 drop (50 mL) of saturated
Potassium Chloride (KCl). No
alteration in pH will occur by
inert KCl.
Calibrate with fresh buffers
Calibrate with buffers that
bracket sample pH
Press MODE or turn meter off
Remove batteries press ON/OFF
button for 3 seconds. Reinsert
batteries (stored data will be
lost)
Reading not stable yet