Chapter 1. Programming Site Data
12
DigitalFlow™ GF868 Programming Manual (2-Channel)
1.6.3 Entering Pipe Data
To program the transducer and pipe parameters via the
PIPE
submenu, complete the following steps and refer to
1.
To enter the
Channel PROGRAM
menu, press
[F1] or [F2]
(depending on the desired channel) at the
User PROGRAM
prompt.
2.
Press
[F3]
at the
Channel PROGRAM
prompt.
3.
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 4.
IMPORTANT:
Special transducers, which have no engraved number on the head, are rarely used. Examine the
transducer head carefully for a number.
1.6.3a 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.
1.6.3b Pipe OD
4.
Enter the known
Pipe OD
or circumference and use the
[F1]-[F4]
keys to select the appropriate units. Press
[ENT].
(The meter will accept values only from 1/8 to 648 in.)
The required pipe data may be obtained by measuring either the pipe outside diameter (OD) or circumference at the
transducer installation site. Alternatively, the information may be obtained from tabulated data for standard pipe sizes.
Table 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
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