Panametrics Sentinel LCT, Руководство пользователя

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Chapter 3. General Programming
46 Sentinel LNG User’s Manual
3.6.4 Entering Error Limits
The Error Limits option enables setting limits for an incoming signal. When the signal falls outside the programmed
limits, an error indication appears on the display screen. To set error limits, follow the steps below.
Note: From the PROG menu, proceed directly to Step 4. To select a different option, scroll to that option and press
[ENT] twice to select it (once to enter and again to confirm the selection).
1. Press [ESC] . The Sentinel LNG enters the User Program.
2. Press the [u] key until PROG is bracketed in the upper left corner and press [ENT].
3. Use the [p] and [q] keys to scroll to the desired Channel and press [ENT].
4. Scroll to the Error Limits option and press [ENT].
5. The first prompt requests the Min Signal limit for the transducer signal received by the Sentinel LNG . The E1:LOW
SIGNAL error message appears if the signal strength falls below the limit programmed here. Press [ENT]. Use the
arrow keys to change the value and press [ENT].
6. Repeat the steps above for the Max Signal limit.
7. The next prompt calls for the Min Velocity limit. Press [ENT]. Use the arrow keys to change the value and press
[ENT].
8. Repeat the steps above to change the Max Velocity limit. (The E3:VELOCITY RANGE error message appears if the
velocity falls outside the minimum and maximum limits.)
9. The meter now requests the Min Amplitude , the lower limit for the amplitude discriminator. The discriminator
measures the size of the transducer signal sent from the Sentinel LNG . If the signal falls outside these limits, the
E5:AMPLITUDE error message appears. Press [ENT]. Use the arrow keys to change the value and press [ENT].
10. Repeat these steps for the Max Amplitude, the upper limit for the discriminator.
11. The next prompt calls for the acceptable Soundspeed limits, based on conditions in the particular system. The
E2:SOUNDSPEED error message appears if the fluid soundspeed exceeds that entered in the Fluid submenu by
more than this percentage. Press [ENT]. Use the arrow keys to change the percentage and press [ENT].
12. The final prompt requests the Acceleration limit for detecting cycle skipping. The E6:ACCELERATION error
message appears if the velocity changes by more than this limit from one reading to the next. Press [ENT]. Use
the arrow keys to change the value and press [ENT] .
You have finished entering data in the PROG menu. Do one of the following:
• To program in other menus, refer to Appendix A, Menu Maps , to navigate to the desired menu.
• To return to the display screen, press [ESC] until the display screen reappears.
• To configure the display, proceed to the next chapter.