GE DigitalFlow GS868, Руководство для стартапов

Страница: 37 / 81

March 2008
2-8 Initial Setup
Pipe Wall
4.
Use the numeric keys to enter the known thickness of the Pipe
Wall . Press
[ENT]
.
If the pipe wall thickness is not available, look up the value in a table
of standard pipe size data or use the Model GS868’s on-line
Help
Menu (see the Programming Manual for details).
Path Length
5.
Press
[F1]
= inch or
[F2] = feet
to select the units. Then, enter the
Path Length (P) of the ultrasonic signal. Press
[ENT]
. (The meter
will only accept values from 1/8 to 900 in.)
Note:
The factory has calculated both the transducer signal path
length
(P)
and the transducer signal axial length
(L)
, based on
the exact transducer configuration used for the application.
These values are engraved on the flowcell and/or are included
in the documentation supplied with the meter.
Axial Length
6.
Press
[F1]
= inch or
[F2] = feet
to select the units.Then, enter the
Axial Length (L) of the ultrasonic signal and press
[ENT]
.
Note:
The factory has calculated both the transducer signal path
length
(P)
and the transducer signal axial length
(L)
, based on
the exact transducer configuration used for the application.
These values are engraved on the flowcell and/or are included
in the documentation supplied with the meter.
Fluid Type
7.
Press
[F1]
= steam or
[F2]
= any other gas to select the Fluid Type.
a.
If
OTHER
was selected, enter the speed of sound (in feet per
second) in the gas to be measured. Press
[ENT]
. (The meter will
only accept values from 125 to 9000 ft/sec.)
Reynolds Correction
8.
The Reynolds Correction factor is a number based on the
kinematic viscosity and flow rate of the gas. At the prompt, press
[F1]
to turn Reynolds Correction off
,
or
[F2]
to turn it on
.
a.
If you select Reynolds Correction, the GC868 asks for the
Kinematic Viscosity of the gas (available in the brochure Sound
Speeds and Pipe Size Data , 914-004). Use the numeric keys to
enter the desired value and press
[ENT]
.
Calibration Factor
9.
Enter a value for the flow Calibration Factor and press
[ENT]
. The
default value is 1.00. (The meter will only accept values from
0.5000 to 2.0000.) The meter will exit the
PIPE
submenu and return
to the initial User (or Channel) Program screen.