5. TDS Mode
5.1 Selecting TDS Mode
1. Select TDS Mode ( →→ F2:Mode →→ F4:TDS).
2. The 90-FL now proceeds to TDS measurement mode. Note that a “ ∗∗ ” is shown in place of the
decimal point until a successful calibration has been performed (see section 5.4).
5.2 Setting the TDS calibration standard
The factory default for this item is 36.00 ppK. If this is satisfactory, go directly to section 5.3.
1. Select the TDS Standard entry
( →→ F4:Setup →→ F1:Standards →→ F2:TDS).
The following screen is now displayed…
TDS Standard:36.00ppK
Range 20 ppM to 500 ppK
2. Type in the value of the TDS standard that is to be used for calibration, including the decimal
point. Use the key to make any corrections.
3. Press to save the value of the standard solution.
Alternatively, press to quit without changing the current setting.
4. The 90-FL will now ask you to enter the units for the TDS standard…
TDS Standard:36.00
Select Units F1:ppM F2:ppK
Press to set the TDS Standard as ppM (parts per Million).
Press to set the TDS Standard as ppK (parts per Thousand).
5. The TDS standard is now programmed for use at calibration.
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