User manual

H70.0.21.6C-01 Operating Manual GMH 3511 page 10 of 14
Error messages of pH calibration:
Neutral buffer not permissible
- Wrong buffer solution
- Buffer solution defective
- Electrode defective
Always use neutral buffer as first solution
(exception: 1 point calibration)
Use new buffer solution
Clean electrode and calibrate again, if error occurs
again -> replace electrode
Slope is too low:
- Buffer solution defective
- Electrode defective
Use new buffer solution
Replace electrode
Slope is too high:
- Buffer solution defective
- Electrode defective
Use new buffer solution
Replace electrode
Incorrect calibration temperature Calibration can only be done at 0…60 °C
Permissible electrodes’ data:
Asymmetry: ±55 mV
Slope: -62 ... -45 mV/pH
7 Configuration
Some menu points depend on current device settings.
To change device settings, press
„Menu“ for 2 seconds. This will activate the configuration menu (main
display: “Set”). Pressing „Menu“ changes between the menus points, pressing jumps to the
referring parameters, which can be selected with key .
The parameters can be changed with or . Pressing „Menu“ again jumps back to the main
configuration menu and saves the settings. "Quit" finishes the configuration and returns to standard
measuring operation.
Pressing “menu” and “store” at the same time for more than 2 seconds will reset the
device to factory defaults
If no key is pressed for more than 2 minutes the configuration will be aborted. All changes will
not be saved!
Paramete
r
Werte Bedeutung
bzw.
Set Confi
g
uration: General confi
g
urations
Input: Selection of measured variable
Arrow „mV“ mV value measurement (REDOX or ORP)
Arrow „mV
H
“ mV value measurement referring to standard hydrogen system
Arrow „pH“ pH value measurement
Unit t: Select temperature unit
°C:
All temperatures in degree Celsius
°F:
All temperatures in degree Fahrenheit
Auto Power-Off: Select power-off delay
1...120
Power-off delay in minutes.
Device will be automatically switched off as soon as this time has
elapsed if no key is pressed/no interface communication takes
place.
oFF
Automatic power-off function deactivated (continuous operation)
Universal Output
oFF
Interface off -> minimal power consumption
SEr:
Serial interface activated
dAC:
Analog output activated
01,11..91
Base address for serial interface communication
4
Set
Menu
4
Set
Menu
3
CAL
3
CAL
2
max
5
min
4
Set
Menu
6
Store
Quit
3
CAL
2
max
5
min