10.6.2.4 Change Measured Vari‐
able
Change Measured Variable
In the "Change Measured Variable" menu
item are listed all of the measured varia‐
bles which can be enabled by the ena‐
bling code.
Ä Chapter 10.6.1 ‘Setting the
Measured Variable/Measuring Range’
on page 131
10.6.2.5 Additional Functions
In the "Additional Functions" menu item,
the range of functions of the
DULCOMETER
®
D1Cb / D1Cc can be
changed by inputting an optionally avail‐
able enabling code.
Ä ‘Extended func‐
tions’ on page 55
10.6.2.6 Operating hour counter
The DULCOMETER
®
D1Cb / D1Cc has
resettable operating time counter.
"Operating hours" menu item: The oper‐
ating hour counter has a resolution of one
minute and a maximum fault in the event
of power failure of 5 minutes. The oper‐
ating hour counter cannot be reset.
10.6.2.7 Calibration Logbook
The data on the successfully completed
sensor calibrations are stored in the
internal calibration logbook. Up to 30 cali‐
brations can be stored. Thereafter the
oldest entry is overwritten with the most
recent entry.
The following data is stored:
n Time of calibration (as per the oper‐
ating hour counter)
– d = day
–
h = hour
– m = minute
n Zero point (without unit)
n Gradient (without unit)
10.6.2.8 Software Version
The version of the software currently
installed and the hardware revision are
shown under the menu item
[Software version]
for the
DULCOMETER
®
D1Cb / D1Cc.
10.6.2.9 Alarm Relay
The alarm relay signals, together with the
and an error message, that there is an
error. This may consist of a:
n General device error
n Power failure: The relay is activated if
voltage is supplied to the control unit
and there is no error. If the voltage is
disconnected, then the relay is deacti‐
vated
n Upper and lower limits of measuring
range breached
n Limit transgression, even without limit
relay, if the control time is set to "Limit
value > 0 s" and is exceeded
n Sensor failure with pH (short circuit or
no sensor connected)
n Overload/short circuit at mA sensor
input
n If alarm relay "active" has been
selected in the "Pause" menu item
and pause is active
Operating Menus Independent of Measured Variables
133
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