Owner's manual
Table Of Contents
- 1 Overview
- 2 Safety
- 3 Commissioning
- 4 Operation
- 4.1 Switching on the meter
- 4.2 Login with a user name
- 4.3 General operating principles
- 4.4 Sensor-independent settings
- 4.5 Sensor info
- 4.6 Channel display
- 4.7 pH value
- 4.7.1 General information
- 4.7.2 Measuring the pH value
- 4.7.3 Settings for pH measurements
- 4.7.4 pH calibration
- 4.7.5 Calibration interval
- 4.7.6 Carrying out an automatic calibration (AutoCal)
- 4.7.7 Carrying out a manual calibration (ConCal)
- 4.7.8 Displaying calibration records
- 4.7.9 Continuous measurement control (CMC function)
- 4.7.10 QSC function (sensor quality control)
- 4.8 ORP voltage
- 4.9 Dissolved oxygen
- 4.10 Conductivity
- 4.11 Data storage
- 4.12 Transmitting data (USB interfaces)
- 4.12.1 Outputting current measurement data
- 4.12.2 Transmitting data (to a PC)
- 4.12.3 Connecting the PC / USB-B interface (USB Device)
- 4.12.4 Options for data transmission to a PC (USB-B interface)
- 4.12.5 Connecting the USB memory device / USB-A interface (USB Host)
- 4.12.6 Data transmission to a USB memory device (USB-A interface)
- 4.13 Reset
- 5 Maintenance, cleaning, disposal
- 6 What to do if...
- 7 Technical data
- 8 Lists
- 9 Appendix: Firmware update

Multi 3420 Operation
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ba75864e11 02/2011
Changing the password If the administrator has set up the access with password protection:
Forgotten the
password?
Contact the administrator.
1 Switch on the meter with <On/Off>.
The Login dialog box appears.
2 Using <S><T>, enter the Benutzername menu item and con-
firm with <MENU/ENTER>.
The user name is highlighted.
3 Using <S><T>, select a user name and confirm with <MENU/
ENTER>.
4 Using <S><T>, enter the Change password menu item and
confirm with <MENU/ENTER>.
5 Enter the old password in the Password box with <S><T>
and <W><X> and confirm with <MENU/ENTER>.
6 Enter the new password in the New password box with
<S><T> and <W><X> and confirm with <MENU/ENTER>.
The password is changed.
The login takes place. If a sensor is connected the measured
value display appears.