Chapter 9.
160
TransPort™ PT878GC User’s Manual
9.1.9
Setting Error Limits
The Error Limits option enables you to set limits for an incoming signal. When the signal falls outside the programmed
limits, an error indication appears. To enter this option, scroll to the Error Limits entry on the Service Menu and press
[ENTER]
. The screen appears similar to Figure 147 below.
Figure 147: The Signal Error Limits Option
1.
The first prompt asks for the minimum and maximum limits for the transducer signal received by the PT878GC.
The default values are 10 for the minimum and 72 for the maximum. The E1: LOW SIGNAL error message appears if
the signal strength falls below the limit programmed here.
To enter the minimum signal:
a.
Press
[ENTER]
to open the text box.
b.
Use the numeric keys to enter the desired value.
c.
Press
[ENTER]
to confirm your entry.
d.
Press the [
] arrow key to move to the maximum signal box, and repeat steps a, b and c.
e.
Press the [
] arrow key to return to the minimum signal box, and the [
] key to move to the next limit.
2.
The next prompt calls for the low and high velocity limits. The E3: VELOCITY RANGE error message appears if the
velocity falls outside these limits. Repeat the steps in Step 1 on the previous page to enter the desired limits.
3.
The third prompt calls for the low and high limits for the amplitude discriminator. The discriminator measures the
size of the transducer signal sent from the PT878GC. If the signal falls outside these limits, the E5: AMPLITUDE error
message appears. Repeat the steps in Step 1 on the previous page to enter the desired limits.
4.
The fourth prompt asks for the acceptable limits for the sound speed, based on conditions in your particular
system. The E2: SOUND SPEED error message appears if the fluid sound speed exceeds that entered in the Pipe
option of the Program menu by more than this percentage. The default value is 20% of the nominal soundspeed.
a.
Press
[ENTER]
to open the text box.
b.
Use the numeric keys to enter the desired percentage.
c.
Press
[ENTER]
to confirm your entry.
5.
The final prompt asks for the acceleration limit for detecting cycle skipping. The E6: CYCLE SKIP/ACCELERATION
message appears if the velocity changes by more than this limit from one reading to the next.
a.
Press
[ENTER]
to open the text box.
Programming
Signal Error Limits
Cancel
OK
Signal
Sound Speed (±)
Amplitude
Velocity
-22.56
m/s
Min
Max
10
72
14
34
%
20
Acceleration
m/s
4.572
22.56
Содержание PT878GC
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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...
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Страница 218: ...Index 208 TransPort PT878GC User s Manual...
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