Chapter 2. Initial Setup
2-3
DigitalFlow™ GC868 Startup Guide (1 and 2-Channel)
2.4 Activating a
Channel
The
ACTIV
submenu permits selection of the desired measurement method. In
addition, it is used to activate/deactivate one or both of the channels in a 2-Channel
Model GC868.
2.4.1
1-Channel Meter
1.
Enter the
ACTIV
submenu by pressing
[F1]
at the
User PROGRAM
prompt.
2.
Press
[F1]
to activate the channel in
BURST
mode.
2.4.2 2-Channel Meter
1.
Enter the
ACTIV
submenu by pressing
[F1]
at the
Channel PROGRAM
prompt.
2.
Press
[F1]
(OFF) to deactivate the channel and return to the
Channel PROGRAM
prompt, or press
[F2]
to activate the channel in
BURST
mode.
2.4.3 1 and 2-Channel
Meters
3.
Press
[F1]
to select
Skan
mode,
[F2]
to select
Skan/Measure Integrate
mode,
[F3]
to select
Skan/Measure Count
mode, or
[F4]
to select
Skan/Correlation
mode
.
The meter will exit the
ACTIV
submenu and return to the channel menu
screen.
a.
If you select Skan or Skan/Measure Count modes, the GC868 asks if you will
Use
703-1273 DSP?
(the digital signal processing board). Press
[F2]
to apply the
board, or
[F1]
to apply the onboard signal processing. (Panametrics
recommends using the DSP for improved response time.)
As indicated in the above prompt, the Model GC868 flowmeter can take
measurements in four different ways:
Skan
is a low resolution technique for locating the acoustic signal and for high
velocity measurements. It is more robust in a noisy environment than the Measure
technique. A variation, the
Skan/Correlation
mode, is used primarily for liquid
detection applications.
Measure
is a more precise technique best used for low velocity measurements. You
can choose from
Skan/Measure Count
(the default technique) or
Skan/Measure
Integrate
(the traditional Skan/Measure mode).
IMPORTANT:
Consult with the factory before selecting the Skan/Correlation or
Skan/Measure Integrate modes.
If
Skan
is selected at the next prompt, the instrument uses this technique exclusively.
However, if one of the
S/M
modes is selected, the meter uses
Skan
to find the
acoustic signal and then tries to use the
Measure
technique for a more precise
measurement.
Proceed directly to the next section to program the
SYSTM
submenu.
2.5 Entering System
Data for a
Channel
Begin the programming of the
SYSTM
submenu in either the
1-Channel
or
2-Channel
section below.
2.5.1
A 1-Channel Meter
For the 1-Channel Model GC868, the information entered in the
SYSTM
submenu
pertains to the global operation of the flowmeter.
1.
At the
User Program
screen, press the
[F2]
function key to program the
SYSTM
submenu.
2.
Enter a
Site Label
of up to 9 characters and press
[ENT]
. (While taking
measurements, the site label will appear on the locator bar.)
3.
Enter a
Site Message
of up to 21 characters. Press
[ENT]
.
4.
To select the
System Units
, press
[F1]
to display parameters and measurements
in English units, or press
[F2]
to display parameters and measurements in Metric
units.
5.
Use the
[F1]
-
[F4]
keys to select the type of
Pressure Units
desired.
The abbreviations and definitions of all the available pressure units are shown in
Table 2-1 below. The choices shown on the option bar are determined by the
selections made at the previous
SYSTEM UNITS prompt
.
