8
44 1538 101-B
Manual flow meter FMOGne
4.
Fault monitoring
4.1
Battery symbol display in the basic state
The built-in 3.6 V lithium battery, type CR ½ AA, is designed for a minimum operating
life of approx. 10 years given a 1,000,000 litre flow rate during this period. The
appearance of the battery symbol in the basic state indicates that the battery
capacity is exhausted and that the battery must be replaced within the next 6
months. The times may be reduced given extreme operating conditions such as a high
flow rate or very low temperatures!
The battery can be replaced without tools once the housing is opened. Cumulative and
calibration values are not affected by replacement.
4.2
Display of five dashes “-----“
The fact of the meter stopping operations and the appearance of five horizontal
dashes in the display points to a fault in the evaluation electronics. As a result, the
meter must be replaced.
5.
Meter programming
5.1
General
The measurement unit (litre, US-Gal, UK-Gal) and the calibrating factor (0.500 - 1.500)
can be set and stored in a fault-redundant manner.
Before a new calibrating factor can be established, a delivery must be made into a
satisfactorily accurate vessel or undertaken by means of a reference meter. The new
calibrating factor is calculated as follows:
angezeigt
abgegeben
alt
neu
Volumen
Volumen
Faktor
Faktor
×
=
Example: A 2 litre measurement vessel is filled; the meter only indicates 1.90 litres.
The existing calibrating factor is 1,040.
The new calibrating factor is calculated to:
012
,
1
985
,
1
000
,
2
004
,
1
=
×
(rounded)
Notice: No volume pulses are counted when the meter is in the programming mode.
When no key is pressed for over 5 minutes in the programming mode, the meter
automatically returns to the basic state.
5.2
Changing over into the programming mode
To get into the programming mode, the “Mode” key is to be pressed for 5 seconds.
Then all segments rapidly flash (approx. 3 Hz) on the LC display.
5.3
Setting the measurement unit
After releasing the “Mode” key, the measurement unit set appears in the display.
Renewed pressing of the “Total” key results in the measurement unit switching