Xylem MULTI 3400 MULTI-PARAMETER METERS - Manual (Page 31)

Multi 3400i Operation
31
Probe evaluation After the calibration, the measuring instrument evaluates the current
status of the probe against the relative slope. The evaluation appears
on the display. The relative slope has no effect on the measuring accu-
racy. Low values indicate that the electrolyte will soon be depleted and
the probe will have to be regenerated.
Starting the calibration Proceed as follows to calibrate the instrument:
Note
The sponge in the air calibration vessel must be moist (not wet). Follow
the instructions in the OxiCal
®
-SL operating manual.
Display Relative slope
S = 0.8 ... 1.25
S = 0.7 ... 0.8
S = 0.6 ... 0.7
E3
Eliminate the error according to
chapter 6 W
HAT TO DO IF ...
S < 0.6 or S > 1.25
1 Perform the preparatory activities according to section 4.3.1.
2 Keep the OxiCal
®
-SL air calibration vessel ready.
3 Put the D. O. probe into the air calibration vessel.
4 Press the <CAL> key repeatedly until the calibration mode ap-
pears. The sensor symbol displays the evaluation of the last
calibration (or no sensor symbol in the delivery state or after the
measurement parameter has been reset).