TransPort™ PT878GC User’s Manual
43
Chapter 4.
b.
A drop-down list of transducer numbers opens, if you have selected clamp-on in the previous prompt. Press
the [
] or [
] keys to scroll to the appropriate number, or scroll to “Special” for a special application
transducer. To speed scrolling, you can press the [
] key to scroll down by a page, or the [
] key to scroll up
by a page.
c.
Press
[ENTER]
to confirm your selection.
The program now varies, depending on whether you have selected preprogrammed or special transducers.
•
If you have selected a transducer from the list of preprogrammed shear clamp-on transducers (#301 to 315), the
PT878GC comes programmed with the needed parameters. You only need to enter the wedge temperature.
a.
From the Wedge Angle prompt, press the [
] key to reach the Wedge Temperature prompt, and press
[ENTER]
.
b.
Use the numeric keys to enter the wedge temperature (in degrees) and press
[ENTER]
.
Note:
For highest accuracy, program the wedge temperature to the average of the gas and ambient
temperatures. For example, if the gas temperature is 350°, the wedge temperature is (350+70)/2 = 210°F.
Pressing the [
] key thus returns the meter to the Transducer tab at the top. Go to page 4-7 to continue
programming.
•
However, if you have selected a special application transducer, turn to the next page.
4.1.2.1
Parameters for Special Transducers
3.
The prompt asks for the transducer frequency, to transmit a voltage at a rate to which the transducer can
respond.
a.
From the Transducer prompt, press the [
] key to reach the Frequency prompt, and press
[ENTER]
.
b.
A drop-down list of five frequencies opens, ranging from 0.25 to 4.00 MHz. Scroll to the frequency of your
transducers, and press
[ENTER]
.
4.
The next prompt asks for Tw, the time delay. This parameter is actually the time the transducer signal spends
travelling through the transducer and cable. The PT878GC calculates the flow rate by subtracting the time of the
upstream and downstream signals, so the time delay must be subtracted out for an accurate measurement.
Panametrics Sensing supplies the time delay on a data sheet inside the transducer case.
a.
From the Frequency prompt, press the [
] key to reach the Tw prompt, and press
[ENTER]
.
b.
Use the numeric keys to enter the Panametrics Sensing-supplied time delay and press
[ENTER]
.
5.
When calculating the flow rate, the PT878GC must take into account the wedge angle, the angle of the ultrasonic
transmission.
a.
From the Tw prompt, press the [
] key to reach the Wedge Angle prompt, and press
[ENTER]
.
b.
Use the numeric keys to enter the Panametrics Sensing-supplied wedge angle (in degrees) and press
[ENTER]
.
6.
The PT878GC must also take into account the wedge temperature.
a.
From the Wedge Angle prompt, press the [
] key to reach the Wedge Temperature prompt, and press
[ENTER]
.
b.
Use the numeric keys to enter the wedge temperature (in degrees) and press
[ENTER]
.
Note:
If the transducer is installed on a pipe that is at a different temperature than the ambient temperature, the
wedge temperature is the average of the pipe temperature and the ambient temperature.
7.
Finally, the PT878GC requires the wedge sound speed.
a.
From the Wedge Temp prompt, press the [
] key to reach the Wedge SS prompt, and press
[ENTER]
.
b.
Use the numeric keys to enter the Panametrics Sensing-supplied wedge sound speed (in ft/sec or m/sec)
and press
[ENTER]
.
Pressing the [
] key returns the meter to the Transducer tab at the top.
•
To confirm the entries and return to Operate Mode, press
[F3]
(OK).
•
To leave the window without confirming the entries and return to Operate Mode, press
[F2]
(Cancel) or the
[ESC]
key.
Содержание PT878GC
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Страница 16: ...Chapter 2 6 TransPort PT878GC User s Manual Figure 3 Connection Locations...
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Страница 152: ...Chapter 9 142 TransPort PT878GC User s Manual Figure 131 Printout of a Typical Drive Report...
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Страница 197: ...TransPort PT878GC User s Manual 187 Appendix A Appendix A A 1 Menu Maps Figure 162 The Main Menu...
Страница 198: ...Appendix A 188 TransPort PT878GC User s Manual...
Страница 199: ...Appendix A TransPort PT878GC User s Manual 189 Figure 163 The Site Menu...
Страница 200: ...Appendix A TransPort PT878GC User s Manual 190 Figure 164 The Program Menu Transducer Lining Fluid and Path Options...
Страница 201: ...Appendix A TransPort PT878GC User s Manual 191 Figure 165 The Program Menu Pipe Option...
Страница 204: ...Appendix A TransPort PT878GC User s Manual 194 Figure 168 The Meter Menu...
Страница 205: ...Appendix A TransPort PT878GC User s Manual 195 Figure 1 Logging Mneu...
Страница 212: ...Appendix D 202 TransPort PT878GC User s Manual...
Страница 218: ...Index 208 TransPort PT878GC User s Manual...
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