Entering Pipe Data; Transducer Number - GE DigitalFlow DF868 Programming Manual

Entering Pipe Data

Transducer Number

Programming Site Data
PIPE
The submenu permits entry of the transducer and pipe
specifications. To program this menu, complete the following steps:
1. At the User Program screen, press
submenu.
2. Enter the Transducer Number engraved on the head of the
transducer and press
complete the steps below. Otherwise, proceed to step 3 on the next
page for a clamp-on transducer, or to step 4 for a wetted
transducer.
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
[ENT]
and press . (The meter will only accept values from 1 to
199.)
[F1]-[F3]
b. Use the keys to select the Wedge Type. Three choices
are available: Rayleigh or Shear wave (for clamp-on
transducers) or wetted transducers.
[F1]-[F3]
c. Use the keys to select the Frequency of the special
transducer.
IMPORTANT:
The frequency is required to transmit an excitation
voltage at the transducer's natural frequency.
d. Enter the special transducer Time Delay (Tw) value supplied by
the factory and press
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.
If you have selected a special wetted transducer, the meter now
rejoins the standard programming sequence. However, if you have
selected a special clamp-on transducer, two additional prompts
appear.
e. Use the numeric keys to enter the Wedge Angle (the angle of
the ultrasonic transmission) in degrees and press
Note: In TransFlection mode, you must enter a separate wedge
angle for both the transmit transducer and the receive
transducer.
f. Use the numeric keys to enter the Wedge Soundspeed in ft/sec
or m/sec and press
[F3]
to program the
[ENT]
. If there is no engraved number,
[ENT]
.
[ENT]
.
March 2008
PIPE
[ENT]
.
1-15