Xylem MULTI 3500i HANDHELD MULTIPARAMETER METERS - Manual (Page 57)

Multi 3500i Operation
55
Calibration in
water vapor
saturated air
(air calibration vessel)
For this calibration procedure, the Comparison meas. setting must be
set to Off in the measuring menu.
Proceed as follows to calibrate the instrument:
Note
The sponge in the air calibration vessel must be moist (not wet). Leave
the sensor in the air calibration vessel for a time long enough to adjust.
1 Put the DO sensor into the air calibration vessel.
2 Connect the DO sensor to the measuring instrument.
3 In the measured value display, select the DO measuring win-
dow with <
▲> <▼> and <M>.
4 Start the calibration with <CAL>.
The calibration display for the relevant sensor type appears.
5 Put the DO sensor into the air calibration vessel.
6 Press <MENU/ENTER>.
The AutoRead measurement to determine the relative slope
starts.
7 Wait for the end of the AutoRead measurement or accept the
calibration value with <MENU/ENTER>.
The determined relative slope is displayed as a message (
i ).
i Relative slope = 1.00
i Use air calibration vessel
Continue
ConOx <CAL>
i Relative slope = 1.00
i Temperature = 24.8 °C
Terminate AutoRead
ConOx <CAL>