Thermo Fisher Scientific Alpha DO 1000 - Manual (Page 16)

8
4.3 Control Concept
The main function and sub-function groups are organised in a matrix format as
shown below. These functions can be accessed via the front keypad for
configuration and selection of parameters.
MEASURE
CODE
OFFSET
SET C
SET-POINT 2
CONTROLLER
OUTPUT
RANGE
CONFIGURATION
CALIBRATION
SET-POINT 1 Set value 1
Switch On /
Off ATC
Set Offset Set Salinity Set Pressure
Controller type
Process temp.
(MTC)
MIN / MAX
Function
Set value 2
N.O./N.C.
contact
mg/l at 0/4 mA Current Output
0..20/4..20 mA
Calibration
Points
mg/l at 20 mA
Set Measurement
Units
Electrode
Status
Alarm Delay
Hysteresis 2
Calib. temp.
(MTC) Calibrate Pt100
Pick-up delay
contact 1
Dropout delay
contact 2
Reset to factory
default settings
Calibrate
MIN / MAX
Function
Hysteresis 1
Pick-up delay
contact 2
Dropout delay
contact 1
Proportional
range XP
Cycle time bzw.
max. frequency
Alarm contact
cont./wiper contact
Electrode Type
The controller offers two levels of password protection: (1) for direct access to
calibration function and (2) for setting or editing specific controller parameters or
functions in the SETUP mode to suit individual requirements.
Note: The passwords are not user-defined and have been set by
factory. It is very important to keep these passwords strictly
confidential to avoid unauthorised tampering of the system at all
times.
Note: If the user reads parameters only, the controller automatically
reverts to Measurement mode if none of the keys is pressed for
30 seconds.