Figure 21 Square Root Dropout Points For Pv1 - Honeywell SMV 3000 User Manual

6.6 DPConf Configuration - PV1,
About Square Root
Output, continued
Square Root Dropout
Figure 21 Square Root Dropout Points for PV1
0utput
(mA dc)
6.4
5.6
4.8
4
1/99
Example: If you have an application with a differential pressure range of
0 to 100 inches of water with an input of 49 inches of water,
substituting into the above formulas yields:
49
• 100 = 49%
100
49%
100
70% • 16 + 4 = 15.2 mA dc Output
To avoid unstable output at PV1 readings near zero, the SMV 3000
transmitter automatically drops square root conformity and changes to
linear conformity for low differential pressure readings. As shown in
Figure 21, the square root dropout point is between 0.4 and 0.5 % of
differential pressure input.
Flow
(% Full
Scale)
15
14
13
12
Dropout Points
11
10
9
8
7
6
5
4
3
2
1
0
0 0.2 0.4
Differential Pressure (% Full Scale)
SMV 3000 Transmitter User's Manual
Continued
• 100 = 70% Flow, and
0.6 0.8 1 1.2 1.4
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Continued on next page
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