Troubleshooting guide

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.

Figure 6-14 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 Figure 6-16.

Note

Desired measuring range must be below the Upper Null Zone.

Trim Near Zone

Reference Peak Reference Peak