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Reference Manual

00809-0100-4811, Rev DA

Section 6: Service and Troubleshooting

January 2015

Service and Troubleshooting

The RCT allows you to view a waveform plot to analyze the measurement signal. The plot shows

the signal and the thresholds used for the different amplitude peaks. By adjusting amplitude

threshold T3, it is possible to detect even weak interface signals.

Guidelines for amplitude threshold settings:

 The amplitude threshold T3 should be approximately 50 % of the interface signal

amplitude.

 Threshold T3 should not be less than 3.

 If possible, T3 should be higher than T2.

You can use the RCT software or a Field Communicator to change the amplitude thresholds. For

the Field Communicator, use the HART command [1, 4, 5, 3]. See also “Amplitude threshold

settings” on page 104.

RCT allows you to view a plot of the measurement signal along with the current thresholds:

1. From the View menu, select the Plotting option, or double-click the Plotting icon in

the Tools section of the RCT project bar.

2. Select the Read button .

3. To adjust the amplitude thresholds, open the Tools section in the RCT project bar and

select Device Commands > Details > Set Nominal Thresholds.

Figure 6-4. Waveform Plot Indicating that the Amplitude Threshold for the Interface Peak

is Too High

Figure 6-4 on page 97 illustrates a situation where amplitude threshold T3 is too high. The signal

amplitude peak at the interface between the upper and lower products is not detected in this

case. By adjusting amplitude threshold T3, the peak at the interface between the upper and

lower products is detected as illustrated in Figure 6-5:

The amplitude threshold is above

the measurement signal peak

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