Chapter 1. Programming Site Data
20
DigitalFlow™ GF868 Programming Manual (2-Channel)
1.6.5 Entering Setup Data (cont.)
1.6.5b Setting Response Time
Use this option to specify the number of readings that occur before the meter will respond to a step change in flow rate.
In general, the smaller the number of readings, the less steady the display will appear.
1.
Press [
and
[F2] = AVRG
to enter the
AVERAGE
submenu.
2.
Use the [
and
[F1]-[F4]
keys to select the desired option. The available response time options are
1, 2, 5, 10, 30, 60
readings and
STATS
. For best results, select
STATS
(statistics), as this increases the response time under steady flow
conditions while still allowing a rapid response to changes in flow rate.
After completing this step, the program returns to the
SETUP
window.
1.6.5c Initializing the System
Use this option to initialize (reset) many of the parameters within the
SETUP
menu to their default values. These
parameters include: Signal Low Limit, Correlation Peak Limit, Velocity Low and High Limits, Acceleration Limit,
Amplitude Discrimination Low, Amplitude Discrimination High, Delta T Offset, Skan T Offset, % of Peak and XMIT
Sample Size. They do
not
include: M>S_Switch, # Shifts, A Divisor, # Transmit Pulses, T WINDOW and R
WINDOW, which remain at their last programmed values.
1.
Press [
and
[F3] = INIT.
2.
Press
[F1] = NO
to keep the current values or press
[F2] = YES
to reset all values to their default settings.
1.6.5d Setting Advanced Parameters
The
ADVAN
option enables you to access the more advanced features of the GF868. In this option you can perform two
functions:
•
enable mass flow (calculated for static fluid density)
•
enter a table of K-factors (based on velocity or Reynolds number) that compensates for non-linear flow rates (see
the next page)
To enter the
ADVAN
submenu, press
[F4]
at the
SETUP
window.
Entering Mass Flow
1.
Press
[F1] = MASS
to enter the Mass Flow option.
2.
At the
Static Density?
prompt, press
[F1]
=
NO
or
[F2]
=
YES
. If you press
NO
, the GF868 returns to the
Advanced
Features
prompt.
3.
If you press
YES
, enter the
Fluid Density
of the gas to be measured and press
[ENT]
. (The meter will only accept
values from 0.00001-100 lb/ft
3
.)
The GF868 returns to the
Advanced Features
prompt.
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