Siemens SITRANS F - Totalizer Scale; Total Resolution

2-43
1010ENFM-3B
Section 2
2.6.14 TOTALIZER SCALE
After you select totalizer units, the meter automatically computes a prefix to provide the best combina-
tion of capacity and resolution (e.g. MGAL/MIN). The [Totalizer Scale] menu cell shows the results. If the
displayed scaling is not suitable, you can edit it by accessing the option list. Note that this scaling applies
to all flow total data displayed on the flow display screen, even if the units do not appear next to the data
(because there may not be room on the screen). Always keep this prefix in mind when you enter
totalizer-related data.
To select a different Totalizer Scale:
To access the [Totalizer Scale] option list press
To move the cursor to the desired display scale press
To register selection press
2.6.15 TOTAL RESOLUTION
The meter assigns multiplier prefixes for the flow total units you selected (e.g., MGPM). It provides three
resolution (or capacity) levels:
0000x000 (where x represents the decimal point)
00000x00
000000x0
Actual Totalizer display units depend on the selected multiplier. Check the total units by accessing the
Totalizer Scale menu cell.
If you use the totalizer (TOTCNT) relay output, take into account:
a) The TOTCNT relay output pulses at a maximum rate of .5 pulses per sec. (.5 Hz).
b) The meter sends a totalizer output pulse for every advance of the rightmost visible
totalizer digit.
It is possible for a high flow rate to persist long enough to exceed the relay output’s .5 Hz rate. If this
occurs, the meter will store excess pulses in an overflow buffer, and route them back to the relay when
the flow rate drops enough to allow the TOTCNT output to catch-up. Exceeding the .5 Hz rate for long
periods could cause an excessive accumulation of buffered pulses and continue to trip the relay after the
flow rate lessens, or even stops. If this occurs, the meter will be unable to indicate the current flow total.
Therefore, select a resolution to ensure that, even at the maximum expected flow rate, the TOTCNT
pulse will not be activated more than .5 times per second for any appreciable length of time. Note that
resetting the Totalizer also clears the overflow buffer.
To change the default resolution:
To access the [Total Resolution] option list press
To move the cursor to the required resolution press
To store selection press
ENT
ENT