Thermo Fisher Scientific Eutech 2700 Series - Manual (Page 33)

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14.
Ion Calibration
The ION 2700 can measure ion concentration such as ammonia or fluoride when
using an ion selective electrode (ISE) for the specific ion of interest.
Ion calibration is required with at least two standards from (8) available values;
0.001, 0.01, 0.1, 1.0, 10, 100, 1000, and 10000.
Prepare ion calibration standards that bracket your measurement range. Follow
the ion selective electrode instruction manual for the appropriate ionic strength
adjustment and sample preparation.
For best results always begin with your lowest calibration standard value,
followed by the next lowest, and so on.
1) Connect the ISE and press MODE as needed for concentration mode.
2) Rinse the ISE with clean water then dIp into
your lowest calibration standard and stir.
Press CAL. Use up/down arrows to match
the upper display to your calibration
standard.
3) The lower display is the mV reading of the ISE. Press ENTER when this
value is stable to accept the calibration point.
4) Rinse the ISE with clean water and dp into your next lowest calibration
standard and stire. Press ENTER after “Stable” appears to accept the
next calibration point.
The primary display will show “- - - -” when ion
calibration is required for ion measurement.