Chapter 1. Programming Site Data
12 DigitalFlow™ GF868 Programming Manual (1-Channel)
1.8 Entering Pipe Data
Enter the transducer and pipe parameters using the PIPE submenu. While following the programming instructions, refer
to Figure 11 on page 87. To program this menu, complete the following steps:
1. At the User (or Channel) Program screen, press [F3] to program the PIPE submenu.
2. Enter the Transducer Number (normally engraved on the head of the transducer). Press [ENT]. If there is no
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.
1.8.1 Special Transducers
a. Assign a number between 91 and 99 to the Special Transducer and press [ENT]. (The meter will only accept
values from 1 to 199.)
b. Use the [ and [F1]-[F4] keys to select the Frequency of the special transducer. The meter can not transmit an
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 [ENT]. (The meter will only
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.
1.8.2 Pipe OD
3. Enter the known Pipe OD or circumference and use the [F1]-[F4] keys to select the appropriate units. Press [ENT].
(The meter will only accept values from 1/8 to 648 in.) The option bar choices, listed in Figure 11 on page 87, 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.
1.8.3 Pipe Wall
4. Use the numeric keys to enter the known thickness of the Pipe Wall. Press [ENT].
IMPORTANT: Because the units cannot be independently chosen for this parameter, the value must be entered in the
same units used for the pipe OD.
If the pipe wall thickness is not available, look up the value in a table of standard pipe size data or use the Model
GF868’s on-line Help Menu (see the Programming Manual for details).
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