Thermo Fisher Scientific CyberScan pH/Ion 510 - Manual (Page 14)

Instruction Manual pH 510/ Ion 510
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If you are performing a 3 point calibration, rinse off the electrode
with deionized water, place it in the next calibration standard and
proceed as follows.
8. Allow meter to stabilize in the next calibration standard. Wait for the
[READY] indicator to appear before you press the ENTER key to
confirm the third calibration point. The upper display flashes for a
few seconds then “SLO” appears in the upper display with the mV
indicator, the number in the lower display is the average electrode
slope in mV (see Figure 6). After a few seconds the meter reverts
to the measurement mode. You are now ready to take ion
measurement.
NOTE: All the calibration values are successfully stored. Otherwise
error message will appear in the LCD if the calibration was
unsuccessful with no values stored into memory.
NOTE: You may compare the average electrode slope value with
the expected slope value for your electrode from your electrode
manual to verify electrode operation.
HINT: Minimum of 2
points and maximum
of 3 points are
allowed for Ion
Calibration. All
calibration points
should be at least
one decade apart, i.e.
valid calibration
points are 0.1, 1, 10
ppm or 1, 10, 100
ppm or 0.1, 1 ppm or
1, 10 ppm or 10, 100,
1000 ppm.
Figure 6: Slope value in mV
Figure 7: Error message Er3
if slope not within range