Endress+Hauser Deltapilot S DB50 - Page 8

Deltapilot S
8 Endress+Hauser
Density measurement
You can measure the density in tanks with pressure overlay using two Deltapilot S probes and a signal
processing unit or a PLC. The signal processing unit or the PLC calculates the density from the known distance
Δh between the two probes and the two measured values p
1
and p
2
.
P01-DB5xxxxx-15-xx-xx-xx-005
Level measurement in a closed tank with pressure overlay
1 Deltapilot S determines pressure measured value p
1
2 Deltapilot S determines pressure measured value p
2
3 Signal processing unit determines the density from the two measured values p
1
and p
2
and the distance Δh.
Level measurement with automatic density correction (with changing media in the tank)
Level measurement with automatic density correction is possible in conjunction with a limit switch such as
Liquiphant and a PLC. The limit switch always switches at the same level. In the switch point, the signal
processing unit determines the corrected density from the pressure of the Deltapilot S probe currently
measured and the known distance between Deltapilot S and the limit switch. The signal processing unit then
calculates the level from the new density and the measured pressure from the Deltapilot S probe.
P01-DB5xxxxx-15-xx-xx-xx-006
Level measurement with automatic density correction
1 Deltapilot S
2 Liquiphant
3PLC
p
2
p
1
Δh
➁
➀
➂
Δh
➁
➀
➂