Instruction Manual
PC 300
14
4.5 TDS
Calibration
4.5.1
Calibrating for TDS directly
The factory default setting for TDS conversion factor is
0.5. If your solution has a different TDS factor, you can
improve calibration accuracy by setting the TDS factor
prior to calibration. See P7.4 for directions.
1.
If necessary, press the
MODE
key to select TDS
mode.
2.
Rinse the probe thoroughly with de-ionized water or
a rinse solution, then rinse with a small amount of
calibration standard.
3.
Dip the probe into the calibration standard. Immerse
the probe tip beyond the upper steel band. Stir the
probe gently to create a homogeneous sample.
Allow time for the reading to stabilize.
4.
Press
CAL/MEAS
to enter TDS calibration mode.
The CAL indicator will appear in the upper right
corner of the display.
5.
Press
the
or
keys to change the value on the
primary display to match the value of the calibration
standard.
6.
Press
ENTER
to confirm the calibration value. The
meter returns to the MEAS (measurement) mode.
See Figure 10.
7.
Repeat steps 1 to 6 for other measuring ranges.
NOTES
To exit from TDS Calibration mode without confirming
calibration, DO NOT press the
ENTER
key in step 6.
Press
CAL/MEAS
instead. This will retain the meter’s old
calibration data in the measuring range of the calibration.
You can offset the TDS reading up to ± 20% from the
default setting. If your measured value differs by more
than ± 40%, clean or replace probe as needed.
Figure 10 - TDS Calibration