Pipe Wall; Fluid Type; Reynolds Correction; Calibration Factor - GE DigitalFlow GC868 Programming Manual

Pipe OD (cont.)

Pipe Wall

Fluid Type

Reynolds Correction

Calibration Factor

Number of Traverses

Programming Site Data
Table 1-4: Available Pipe OD Units
English
inch = pipe OD in inches
feet = pipe OD in feet
in/PI = pipe circumference
in inches
ft/PI = pipe circumference
in feet
6. Enter the known thickness of the Pipe Wall, in the same units used
for the pipe OD. Press
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.
[F1]
7. Press = natural gas,
gas to select the Fluid Type. If
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.)
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
•
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
9. Enter a value for the flow Calibration Factor and press
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
[F1]-[F4]
10. Press 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)).
Metric
mm = pipe OD in millimeters
m = pipe OD in meters
mm/PI = pipe circumference
in millimeters
m/PI = pipe circumference
in meters
[ENT]
. (The meter will only accept values
[F2] [F3]
= air, = steam, or
OTHER
was selected, enter the speed
, [F2]
or to turn it on
[ENT]
.
PIPE
menu.
April 2008
[F4]
= any other
.
[ENT]
. The
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