GE AquaTrans AT868, User Manual

Page: 31 / 158

September 2004
2-6 Programming Site Data
Special Transducers
1.
For a special transducer, press [
X
] to move the cursor to
STD
and
press
[
S
]
until
SPEC
appears and press
[ENTER]
.
2.
Assign a number between 90 and 99 to the special transducer.
Enter the number by using the arrow keys. Press [
W
]
and [
X
] to
move the cursor to desired location and press
[
S
]
and
[
T
]
to
increase or decrease the number and press
[ENTER]
.
3.
Press [
W
]
and [
X
] to select the wedge type (supplied by GE
Infrastructure Sensing) and press
[ENTER]
.
4.
Press [
W
]
and [
X
] to select the transducer frequency (supplied by
GE Infrastructure Sensing) and press
[ENTER]
.
Note:
The frequency is required to transmit an excitation voltage at
the transducer’s natural frequency.
5.
Enter the special transducer time delay value (supplied by GE
Infrastructure Sensing) by using the arrow keys. Press [
W
]
and
[
X
] to move the cursor to desired location and press
[
S
]
and
[
T
]
to increase or decrease the number and press
[ENTER]
.
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.
Special Clamp-On
Transducers
The following two prompts appear only if special clamp-on
transducers are being used. If special wetted transducers are being
used, proceed to
Pipe Outside Diameter on page 2-8.
1.
Enter the wedge angle (supplied by GE Infrastructure Sensing) of
the transducer by using the arrow keys. Press [
W
]
and [
X
] to
move the cursor to desired location and press
[
S
]
and
[
T
]
to
increase or decrease the number and press
[ENTER]
.
2.
Enter the wedge sound speed (supplied by GE Infrastructure
Sensing) of the transducer by using the arrow keys. Press [
W
]
and
[
X
] to move the cursor to desired location and press
[
S
]
and
[
T
]
to increase or decrease the number and press
[ENTER]
. Proceed to
Pipe Material on page 2-7.