GE DigitalFlow GC868, Programming Manual

Page: 24 / 172

Programming Site Data 1-15
April 2008
Pipe OD (cont.)
Pipe Wall
6. Enter the known thickness of the Pipe Wall , in the same units used
for the pipe OD. Press
[ENT]
. (The meter will only accept values
from 0 to 4 in.)
If the pipe wall thickness is not known and cannot be conveniently
measured, look up the value in a table of standard pipe size data or
use the Model GC868’s on-line
Help Menu .
Fluid Type
7. Press
[F1]
= natural gas,
[F2]
= air,
[F3]
= steam, or
[F4]
= any other
gas to select the Fluid Type. 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
.
•
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 correct 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.) If you are using wetted transducers, you have
completed programming in the
PIPE
menu.
Number of Traverses
10. Press
[F1]-[F4]
to select the desired number of traverses (times the
ultrasonic signal traverses the pipe, from 1 to 9).
Note:
Most clamp-on gas applications require a single traverse
(1(Z)).
Table 1-4: Available Pipe OD Units
English Metric
inch = pipe OD in inches mm = pipe OD in millimeters
feet = pipe OD in feet m = pipe OD in meters
in/PI = pipe circumference
in inches mm/PI = pipe circumference
in millimeters
ft/PI = pipe circumference
in feet m/PI = pipe circumference
in meters