LaMotte 5 Series TDS Meter - Manual (Page 14)

CALIBRATION
Important Information on Meter Calibration
The meter has five measuring ranges. The meter can be calibrated at one po
int in each of the five measuring ranges. If measurements are being taken in
more than one range, each of the ranges were measurements are being made
must be calibrated.
The following table lists the corresponding conductivity and TDS ranges. Each
range should be calibrated with a solution that falls between the values in the
“recommended calibration solution range” column.
Conductivity
Range Recommended
Calibration
Solution Range TDS Range Recommended
Calibration
Solution Range
0.00 to 20.00 µS 6.00 to 17.00 µS 0.00 to 10.00 ppm 3.00 to 8.50 ppm
0.0 to 200.0 µS 60.0 to 170.0 µS 10.0 to 100.0 ppm 30.0 to 85.0 ppm
0 to 2000 µS 600 to 1700 µS 100 to 1000 ppm 300 to 850 ppm
0.00 to 20.00 mS 6.00 to 17.00 mS 1.00 to 10.00 ppt 3.00 to 8.50 ppt
0.0 to 200.0 mS 60.0 to 170.0 mS 10.0 to 200 ppt 30.0 to 170 ppt
When the meter is recalibrated, the old calibrations are replaced on a range by
range basis. For example, if the conductivity meter was previously calibrated at
1413 µS in the 0 to 2000 µS range and it is recalibrated at 1500 µS (also in the
0 to 2000 µS range), the meter will replace the old calibration data (1413 µS)
with the new calibration data (1500 µS ) for that range. The meter will retain
all calibration data in the other ranges.
To completely recalibrate the meter, or when a probe is replaced, it is best to
clear all calibration data. To erase all the old conductivity or TDS calibration
data completely, see – Restore Factory Default Values.
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