Annex
FLUXUS H721 A Menu structure
219
UMFLUXUS_H721V1-5EN, 2022-05-15
Example 4
The fluid change in a pipe has to be monitored.
The fluid in the pipe changes during the measurement. The fluid change from crude oil to gasoline has to be output via a binary
output. The entire fluid change will take place within 2 minutes.
It is assumed that crude oil with an API gravity of 40 is flowing in the pipe and afterwards gasoline with an API gravity of 50 will be
transported. So a change of 10 °API within 2 minutes has to be expected.
The goal is that the binary output closes at the beginning of the fluid change and reopens at its end. If the product quality changes for
several °APIs during one hour, the change rate is below 0.5 °API/10 s. Therefore, no fluid change will be detected.
Trigger:
Condition:
Action:
Δ API gravity > 0.5 °API (fluid change time base: 10 s)
R1 with Δ API gravity > 0.5 °API
binary output closes
Special functions Options Options
Measurement Channel A Channel A
Measurement modes Event trigger Outputs
Fluid decision
Select R1 Select B1
Reference temp.
Enable R1 Enable B1
Reference pressure
Yes Yes
Select channel
Source item Source item
Current fluid → HPI measurement → Event trigger
Source item HPI measurement Event trigger
→ API gravity →ΔAPI gravity → R1
CTL method Function Idle state
→ Density → MAX (x>limit) → NO
CPL method Type Terminals
→ Automatic → Non-hold
Test signal
Fluid change time base [1] Trigger value
→ 10 s → 0.5 °API
Fluid change damping [1] Hysteresis
→ 10 s → 0.05 °API
Number of fluids Glitch interval
→ 4 → 1.0 s
Min. range distance Failure delay
→ 0.8 °API → 1.0 s
Fluid name
→ #1
→ Fuel oils
→ 17…22 °API
→ #2
→ Crude oil
→ 30…45 °API
→ #3
→ Gasolines
→ 47…65 °API
→ #3
→ naphtha
→ 70…85 °API
Legend
[1] from SuperUser mode
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