Emerson Rosemount 5300 Series - Page 117

Table 5-2: Safety Margin in Inches and Millimeters
Level Rate in/min (mm/
min)
Damping Value
2 s (default) 10 s 20 s 50 s
Level Rate > 6.40 (160) 0.25 × Level Rate 0.60 × Level Rate 0.90 × Level Rate 1.90 × Level Rate
2.35 (60) < Level Rate <
6.40 (160)
0.50 × Level Rate 0.85 × Level Rate 1.15 × Level Rate 2.15 × Level Rate
1.05 (25) < Level Rate <
2.35 (60)
0.90 × Level Rate 1.25 × Level Rate 1.60 × Level Rate 2.60 × Level Rate
Level Rate < 1.05 (25) 1.75 × Level Rate 2.10 × Level Rate 2.40 × Level Rate 3.40 × Level Rate
Table 5-3: Safety Margin in Inches and Millimeters with Signal Quality Metrics Turned On
Level Rate in/min (mm/
min)
Damping Value
2 s (default) 10 s 20 s 50 s
Level Rate > 6.40 (160) 0.40 × Level Rate 0.65 × Level Rate 1.00 × Level Rate 2.00 × Level Rate
2.35 (60) < Level Rate <
6.40 (160)
0.85 × Level Rate 1.10 × Level Rate 1.45 × Level Rate 2.45 × Level Rate
1.05 (25) < Level Rate <
2.35 (60)
1.55 × Level Rate 1.85 × Level Rate 2.15 × Level Rate 3.15 × Level Rate
Level Rate < 1.05 (25) 3.05 × Level Rate 3.30 × Level Rate 3.65 × Level Rate 4.65 × Level Rate
Procedure
1. Identify maximum product level rate for the application.
2. Note configured Damping Value.
a) In Rosemount Radar Master, select Setup → Advanced.
b) Select the Echo Tracking tab.
3. Calculate where to position the high alarm limit in your host system.
a) Determine desired high alarm limit.
b) Subtract safety margin from the desired high alarm limit according to Table
5-2 (or Table 5-3 if Signal Quality Metrics is turned on).
4. Calculate where to position the low alarm limit in your host system.
a) Determine desired low alarm limit.
b) Add safety margin to the desired low alarm limit according to Table 5-2 (or
Table 5-3 if Signal Quality Metrics is turned on).
Determine high alarm limit
Maximum product level rate = 100 mm/min Damping Value = 10 s
The Signal Quality Metrics is turned off in this example, so the safety margin is calculated
using Table 5-2.
Safety margin = 0.85 × Level Rate = 0.85 × 100 = 85 mm
Reference Manual Configuration
00809-0100-4530 April 2019
Reference Manual 117