Myron L 9PTK with FCE Free Chlorine - Manual (Page 30)

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c. Press twice to skip calibration adjustment and accept
the new tempco (3 times if in TDS mode). You are now ready to
measure samples with your new temperature compensation factor.
2. Disabling Temperature Compensation
a. Select User mode (ref. Procedure to Select a Solution, pg. 25).
b. With “User” selected, press . If the display does not
show .00%/°C, hold long enough to bring the tempco to
.00%/°C (see Figure 3).
c. Press twice (3 times if in TDS mode). Temperature
compensation is now disabled (=0) for measurements in User
mode.
3. User Programmable Conductivity to TDS Ratio
This feature allows you to select a custom conductivity to TDS conversion
ratio within the range of 0.20-7.99 for User mode measurements.
To determine the conversion ratio for a custom solution of known
TDS ppm value, measure the solution conductivity at 25ºc with the
Ultrameter III and divide the ppm value by the µS value. For example,
a solution of known 75 ppm TDS and measured 100 µS conductivity at
25ºC would have a conversion ratio of 75/100 or 0.75. Enter the new
conversion ratio as follows: