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OR
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14
F.
Dead band setting
Basic dead band of the instrument near the zero fl ow rate is 0.1 l/s. This dead band can be changed so that it would be
possible to suppress undesirable fl ow rate values occurring due to liquid surges and vibrations in tubing at the zero fl ow rate.
WARNING
EXTENSION OF THE DEAD BAND INCREASES MEASUREMENT ERROR AT LOW FLOW RATES. HENCE,
PARASITIC MOVEMENTS OF LIQUID SHOULD BE ELIMINATED FIRST.
1. Use the cursor keys to select the option
MEASUREMENT
from the main menu and confi rm your selection with the
EXE
button.
2. Under the
ZERO
option, select the command
EDIT
and press the
EXE
button to edit the band size in l/s, in which no fl ow
rate is to be registered. Use the cursor keys to set the numeric value in v l/s and confi rm with the
EXE
button.
3. Select the option
RETURN
to complete the set up.
The instrument will ask if you want to save the new parameters by displaying the text
SAVE SETUP?
. Select
YES
to confi rm
and the fl ow meter will save the new parameters and switch to normal display mode. If
NO
is selected, parameters will not be
saved.
The instrument will switch to display mode and work with the new parameters until it is switched off . When the instrument is
switched on again, it will use the original/default parameters.
G. Datalogger
The internal datalogger enables recording of measured values in chosen intervals (either periodically or one at a time) and
their storing in the instrument’s memory.
Stored values can be subsequently read on the display or on a PC via the RS232 communication link.
The datalogger records the following parameters by default: total volume in positive direction V+, total volume in negative
direction V-, instrument status at the moment of reading Exx, and real time at the moment of reading t.
Alternatively, you can choose to record one of the following additional values: immediate fl ow rate Q, maximum fl ow rate
during chosen interval MAX, minimum fl ow rate during chosen interval MIN or average fl ow rate during chosen interval AVR.
All samples containing the above mentioned data are stored in memory as a single record.
Capacity of the sample memory is 100 records. Samples are recorded step-by-step and they are assigned addresses from 1
to 100. After 100 samples have been recorded, the oldest sample with address ‘1’ is deleted, memory is readdressed and the
new sample is inserted to address ‘100’. The memory content is not corrupted if power failure occurs.
Sample recording can be set with fi xed intervals from 15 to 107 minutes (e.g., every 15 minutes after datalogger start)
regardless of real time or using a time mask (e.g., datalogger starts each Friday at 15:00 and measurement interval takes 2
hours).
