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EC500-en-US_v2.9 7/20
Changing Measurement Function
The meter can be set to measure pH, Conductivity, TDS or Salinity.
To change the mode:
1. Press and Hold the
MODE/HOLD
button for 2 seconds and the display will begin to scroll
through the units.
µS
(Conductivity);
pH
;
ppm S
(Salinity);
ppm
(TDS);
mg/l
(TDS);
Note:
displayed in the lower left corner of the display, briefly press the
MODE/HOLD
button to turn it off.
2. When the desired units are displayed, release the
MODE/HOLD
button.
TDS Compensation Ratio
The TDS value is determined by multiplying a conductivity reading by a known ratio factor. The
meter allows for selecting a conversion ratio in the range of 0.4 to 1.0. The ratio varies with the
application, but is typically set between 0.5 and 0.7.
Note: The stored ratio will briefly appear in the lower temperature display when the meter is first
turned on, or when changing measurement function to TDS.
Note: In the Salinity mode the ratio is 0.4 to 0.6 auto
To change the ratio, while in the TDS measurement mode (ppm or mg/l):
1. Press and release the
CAL/RECALL
button twice in succession. The stored
ratio will appear in the display.
2. Press the
MODE/HOLD
button to increase the ratio value in steps of 0.1.
3. When the desired ratio is displayed, press and release the
CAL/RECALL
button to store the value and return to the normal mode.
4. If no buttons are pressed for 5 seconds, the meter returns to measure mode.
Storing Readings
1. Press the
MODE/HOLD
button to store a reading. The storage location
number will be displayed on the lower display, while the main display shows
the stored reading. The meter will enter the HOLD mode and the
indicator will appear.
2. Press the
MODE/HOLD
button again to exit the HOLD mode and return to
normal operation.
3. If more than 25 readings are stored, previously stored readings (starting with
number 1) will be overwritten.
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