Instruction manual

accQcomm Interface Module
Section 2 Installation and Operation
2-14
When selecting the TCF, keep in mind that the system’s response
to any change within the specified range (see sections 2.6.2 and
2.6.3) is affected by smoothing. The data output becomes more
uniform with smaller TCF settings, but this also lengthens the
system’s response time to changes in conditions.
If you have questions regarding the smoothing function and
selection of the Time Constant Factor, contact Teledyne Isco at
[phone].
2.6.2 “Don’t Smooth”
Function
This function deactivates smoothing in the event of an abrupt
change in flow rate within a measurement interval. A sudden
rise or fall in flow at or above this value will disable smoothing
for that reading, allowing the accQcomm to accurately represent
this change in flow before resuming the smoothing function.
Enter the desired value for “Don’t smooth changes over____”. The
units of measure will reflect those you selected on the Site tab.
2.6.3 Zero Value for Small
Flows
In order to avoid continued data output when the flow values are
minimal, enter the desired minimum values for “Force to zero if
less than____”. When a measured value falls below this point, the
output will be set to zero.
This function is useful, for instance, with overflow or storm appli-
cations where normal condition flows are low to nonexistent.
The units of measure will reflect those you selected on the Site
tab.
2.6.4 Bad Data The accQcomm maintains a separate Bad Data counter for each
instrument and smoothed data type. The counter increments
each time a reading with flow, velocity, depth, or temperature
value(s) marked as bad is received by the accQcomm.
Non-smoothed data types with values marked bad are repre-
sented on the display with two dashes (– –).
Smoothed data types will continue to output their last good value
when a value marked bad is received. If the “Display smoothed...”
box is checked, smoothed data will also be shown on the display.
With the “Clear smoothed values” box checked, if the Bad Data
counter for a smoothed data type reaches or exceeds the specified
number of consecutive bad readings, the smoothed value is
cleared and the value will be represented on the display with two
dashes (– –).