Total Resolution; Totalizer Mode - Siemens SITRANS F Operating Instructions Manual

Section 2

2.6.7 TOTAL RESOLUTION

The meter assigns multiplier prefixes for the flow total units you have selected (e.g., MGPM). It provides
three resolution (or capacity) levels:
00000x00
000000x0
0000000x
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:
The TOTCNT relay output pulses at a maximum rate of .5 pulses per sec. (.5 Hz).
The meter sends a totalizer output pulse for every advance of the rightmost visible total- zer 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 toensure 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
Move the cursor to the required resolution by pressing
To store selection press
2.6.8

TOTALIZER MODE

The Totalizer function operates in any of the modes listed below:
MODE FLOW DIRECTION
POSFLOW Positive Flow
NEGFLOW Negative Flow
NETFLOW Positive or Negative
NETFLOW (default) is best for applications where there may be zero flow for long periods. It mini-
mizes false Totalizer register increments due to data scatter. Press
To select a Totalizer Mode:
To access the [Totalizer Mode] option list press
Move the cursor to the required Totalizer mode by pressing
To store selection press
(where x represents the decimal point)
ENT
Accumulates flow in positive direction only
Accumulates flow in reverse dirction only
Adds to positive total; subtracts from reverse
total.
ENT
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1010PFM-3G
NOTES
to accept the default setting.