Instruction manual

Instruction Manual PC 510
11
5.5 TDS Calibration
5.5.1 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 Program
P7.4 on page 36 for directions.
1. If necessary, press the MODE key to select TDS mode.
2. Rinse the probe thoroughly with de-ionised water or a rinse
solution, then rinse with a small amount of calibration standard.
3. If necessary, ensure that the probe’s yellow probe guard is
attached. 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
stabilise.
4. Press the CAL/MEAS to enter TDS calibration mode. The CAL
indicator will appear in the upper right corner of the display.
5. Press the  or  key 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 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 ±40% from the
default setting. If your measured value differs by more than ±40%,
clean or replace probe as needed, or use a calibration standard with a
higher value as required.
MEAS
265
ppm
ATC
°C
25.8
300
ppm
ATC
°C
25.8
MEAS
READY
E
N
T
E
R
R
A
N
G
E
265
ppm
ATC
°C
25.8
CAL
C
A
L
M
E
A
S
300
ppm
265
CAL
READY
Figure 10: TDS calibration