35
Dry-run Configuration
Dry-run Configuration
November 2019
Safety Manual
00809-0400-5100, Rev AB
Appendix C Dry-run Configuration
This section describes the recommended procedure to configure the Safety System for
Dry-run applications.
Prior to setting up the Safety System for Dry-run it
has to be installed and configured as a standard
Rosemount
™
Tank Gauging system.
The Dry-run configuration aims at specifying the
Low Alarm Limit as well as optimizing the Hold Off
Distance and Amplitude Thresholds.
The Hold Off Distance should be as large as
possible to avoid impact from noise in the upper
part of the tank.
It is recommended to use the Tank Scan
(1)
function in TankMaster WinSetup for
configuration of various amplitude thresholds. By
creating an Amplitude Threshold Point (ATP)
curve, noise will be filtered out to ensure that the
product surface is detected at all times.
1. Define the Minimum Operation Distance for
the application. This is the Distance from the
bottom of the flange to the maximum filling
point of the Tank in normal operation.
2. Specify a safety margin to ensure that there will
be a sufficient gap between the Hold Off
Distance and the Minimum Operation
Distance. A margin of 50 -100 mm should be
sufficient in most cases. This will make sure that
no false alarms are triggered in case of minor
measurement errors near the maximum filling
point.
3. Set the Hold Off Distance
(2)
equal to the
Minimum Operation Distance - safety margin.
A. Amplitude threshold
B. High Alarm Limit
C. Product surface
Distance
Amplitude
A
B
C
Distance
Amplitude
D
A. Amplitude threshold
B. High Alarm Limit
C. Product surface
D. Minimum operation distance
A
B
C
A
C
B
Distance
Amplitude
A. Amplitude threshold
B. High Alarm Limit
C. Product surface
D. Minimum operation distance
E. Hold Off Distance
F. Measurement range
D
E
F
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