Xylem MULTI 1970I PORTABLE MULTIPARAMETER METERS - Manual (Page 35)

Multi 1970i Operation
33
Sensor evaluation After the calibration, the measuring instrument evaluates the current
status of the sensor 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 sensor 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). Ob-
serve 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
Perform error elimination accord-
ing to chapter 6 W
HAT TO DO IF ...
S < 0.6 or S > 1.25
1 Perform the preparatory activities according to section 4.4.1.
2 Keep the OxiCal
®
-SL air calibration vessel ready.
3 Put the D. O. sensor 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
measuring parameters have been reset).