10
4.1
4. Calibration
Important Information on Meter Calibration
Your meter has five measuring ranges. You can calibrate at one point in each of the
measuring ranges (up to five points). If you are measuring values in more than one
range, make sure to calibrate each of the ranges you are measuring.
To view current calibration points, see SETUP section Program 2.0 on page 29.
IMPOR
TANT: You need to calibrate your meter at a standard that is a minimum
of 20% of the range in which you are measuring. For example, use a minimum
calibration value of 400 µS in the 0 to 1999 µS range.
The following table lists the corresponding conductivity and TDS ranges. You
should calibrate each range using a solution that falls between the values in the
“recommended calibration solution range” column.
When you recalibrate your meter, old calibrations are replaced on a range basis.
For example, if you previously calibrated your conductivity meter at 1413 µS in the
0 to 1999 µS range and you recalibrate at 1500 µS (also in the 0 to 1999 µS range),
the meter will replace the old calibration data (1413 µS) in that range. The meter
will retain all calibration data in other ranges.
To completely recalibrate your meter, or when you use a replacement probe, it is best
to clear all calibration data in memory. To erase all old conductivity and TDS calibra-
tion data completely from memory, see SETUP section Program 8.0 on page 40.
Conductivity Recommended Calibration TDS Recommended Calibration
Range Solution Range Range Solution Range
0.00-19.99 µS 6.00 to 17.00 µS 0.00-9.99 ppm 3.00 to 8.50 ppm
0.0-199.9 µS 60.0 to 170.0 µS 10.0-99.9 ppm 30.0 to 85.0 ppm
0-1999 µS 600 to 1700 µS 100-999 ppm 300 to 850 ppm
0.00-19.99 mS 6.00 to 17.00 mS 1.00-9.99 ppt 3.00 to 8.50 ppt
0.0-199.9 mS 60.0 to 170.0 mS 10.0-200 ppt 30.0 to 170 ppt
For information on how to calibrate your meter:
• See section 4.3 on pages 12-13 for Conductivity Calibration.
• See section 4.3 on pages 14-15 for TDS Calibration.
• See section 4.4 on page 16 for Temperature Calibration.
• See Addendum 1 on page 45 for more calibration tips.
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