94
Reference Manual
00809-0100-4308, Rev BA
Section 6: Service and Troubleshooting
December 2014
Service and Troubleshooting
Using the Trim Near Zone function
The Trim Near Zone function is used to fine tune performance in the area close to the tank top.
Normally it is not necessary to use the function, but if you experience problems related to the
nozzle, pipe, or chamber installation, you may need to use this function.
describes the Trim Near Zone function and its effect on the echo curve. This effect
is only visible if measurement conditions so require.
Figure 6-14. Echo Curve before and after Trim Near Zone
Note
Make sure the product level is below the Near Zone region (0-3.3 ft. (0-1 m) below the Upper
Reference Point) before performing the Trim Near Zone.
Note
The Trim Near Zone function should only be used for reducing impact from stationary
disturbances. For occasional disturbances, use the Near Zone Threshold.
To use the Trim Near Zone function, do the following:
1.
From the
Home
Screen, go to
Service Tools > Echo Tuning
and click
Near Zone
.
2.
Under
Near Zone Compensation
, click
Trim Near Zone
and follow the on-screen
instructions.
Changing the Upper Null Zone
Measurements are not performed within the Upper Null Zone (UNZ). The Upper Null Zone can
be extended to block out disturbing echoes close to the tank top, caused by for example a
narrow nozzle with rough walls, obstacles close to the probe, or a nozzle that protrudes into the
tank. See
.
Note
Desired measuring range must be below the Upper Null Zone.
Trim Near Zone
Reference Peak
Reference Peak
Содержание 3308A Rosemount 3308 Series
Страница 2: ......
Страница 6: ...vi Reference Manual 00809 0100 4308 Rev BA Title Page December 2014 ...
Страница 12: ...vi Reference Manual 00809 0100 4308 Rev BA Table of Contents December 2014 Table of Contents ...
Страница 14: ...2 Reference Manual 00809 0100 4308 Rev BA Section 1 Introduction December 2014 Introduction ...
Страница 24: ...12 Reference Manual 00809 0100 4308 Rev BA Section 2 Transmitter Overview December 2014 Transmitter Overview ...
Страница 52: ...40 Reference Manual 00809 0100 4308 Rev BA Section 3 Installation December 2014 Installation ...
Страница 72: ...60 Reference Manual 00809 0100 4308 Rev BA Section 4 Configuration December 2014 Configuration ...
Страница 80: ...68 Reference Manual 00809 0100 4308 Rev BA Section 5 Operation December 2014 Operation ...
Страница 150: ...138 Reference Manual 00809 0100 4308 Rev BA Appendix A Reference Data December 2014 Reference Data ...
Страница 162: ...150 Reference Manual 00809 0100 4308 Rev BA Appendix B Product Certifications December 2014 Product Certifications ...
Страница 196: ...4 Reference Manual 00809 0100 4308 Rev BA Index December 2014 Index ...
Страница 197: ......