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Reference Manual

00809-0100-4811, Rev DA

Section 6: Service and Troubleshooting

January 2015

Service and Troubleshooting

Figure 6-5. After Changing the Amplitude Threshold the Transmitter Detects the Interface

6.2.4 High level rates

The measurement signal is filtered in order to minimize the influence of disturbing noise. In

most measurement situations, this does not have a noticeable effect on the response time to

level changes. However, if high level rates occur, it may be necessary to reduce the damping

value to allow the transmitter to respond quicker. If there is too much noise, the damping value

may be increased in order to get a stable measurement signal.

You can use the RCT software or a Field Communicator to change the damping value. For the

HART Communicator use the key sequence [1, 3, 5].

In the RCT software, open the Setup > Output tab and enter the desired damping value:

The damping parameter determines how quickly the transmitter responds to level changes and

how robust the measurement signal is against noise. Technically, a damping value of 10 means

that in 10 seconds the output from the transmitter is about 63% of the new level value.

Consequently, when there are rapid level changes in the tank, it may be necessary to decrease

the damping value for the transmitter to be able to track the surface. On the other hand, in

noisy environments, and if level rates are low, it may be better to increase the damping value to

have a stable output signal.

The amplitude threshold is adjusted

below the peak to allow the interface

peak to be detected

Damping

Output tab

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