Figure 26 Square Root Dropout Point - Honeywell ST 3000 User Manual
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- User manual (338 pages) ,
- Installation manual (126 pages) ,
- Specification and model selection manual (36 pages)
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EXAMPLE:
Square root dropout
To avoid unstable output at readings near zero, the ST 3000 transmitter automatically drops square root
conformity and changes to linear conformity for low differential pressure readings. As shown in Figure 26,
the point is near 0.5% of input for ST 3000 transmitters.
0utput
(mA dc)
6.4
5.6
4.8
4
10/05
6— Configuration - Pressure transfer function— Selecting Output Conformity
If you have a differential pressure transmitter with a range of 0 to 100 inches of water
with an input of 49 inches of water, substituting into the previous formulas yields:
49
100 • 100 = 49%
49%
100 • 100 = 70% Flow, and
70% • 16 + 4 = 15.2 mA dc Output
Flow
(% of Span)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0.2
Figure 26 Square Root Dropout Point
ST 3000 HART Transmitter Release 300 User Manual
Dropout Points
0.4
0.6
0.8
Differential Pressure (% Full Scale)
1
1.2
1.4
61
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