Entering Pipe Data; Transducer Number; Pipe Od; Pipe Wall - GE DigitalFlow GS868 Startup Manual

2.6 Entering Pipe Data

PIPE
The submenu permits entry of the transducer and pipe specifications. To program this menu, complete the
following steps:
1. At the User (or Channel) Program screen, press

2.6.1 Transducer Number

2. Enter the Transducer Number (normally engraved on the head of the transducer). Press
engraved number, complete the steps below. Otherwise, proceed to step 3.
IMPORTANT:
Special transducers, which have no engraved number on the head, are rarely used. Examine the
transducer head carefully for a number.
a. Assign a number between 91 and 99 to the Special Transducer and press
values from 1 to 199.)
b. Use the  ] and
excitation voltage at the transducer's natural frequency without this data.
c. Enter the special transducer Time Delay (Tw) value supplied by the factory. Press
accept values from 0 to 1000 sec.)
Note: Tw is the time required for the transducer signal to travel through the transducer and its cable. This time delay
must be subtracted from the transit times of the upstream and downstream transducers to ensure an accurate
measurement.

2.6.2 Pipe OD

3. Enter the known Pipe OD or circumference and use the
(The meter will only accept values from 1/8 to 648 in.) The option bar choices may appear in English or Metric
units.
Obtain the required information by measuring either the pipe outside diameter (OD) or circumference at the transducer
installation site. The data may also be obtained from standard pipe size tables. Table 6 below lists the available English
and metric OD units.
inch = pipe OD in inches
feet = pipe OD in feet
in/PI = pipe circumference in inches
ft/PI = pipe circumference in feet

2.6.3 Pipe Wall

4. Use the numeric keys to enter the known thickness of the Pipe Wall. Press
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).
DigitalFlow™ GS868 Startup Guide
[F1]-[F4]
keys to select the Frequency of the special transducer. The meter can not transmit an
Table 6: Available Pipe OD Units
English
[F3] PIPE
to program the
[F1]-[F4]
keys to select the appropriate units. Press
mm = pipe OD in millimeters
m = pipe OD in meters
mm/PI = pipe circumference in millimeters
m/PI = pipe circumference in meters
Chapter 2. Initial Setup
submenu.
[ENT]
. If there is no
[ENT]
. (The meter will only accept
[ENT]
. (The meter will only
Metric
[ENT]
.
[ENT].
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