Endress Hauser  Ultrasonic measurement Time-of-FlightProsonic FDU91-RG2AA

The FDU91 ultrasonic sensor for continuous, non-contact and maintenance-free level measurement of fluids, pastes, sludges and powdery to coarse bulk materials. But also for flow measurement in open channels and measuring weirs. The measurement is unaffected by dielectric constant, density or humidity and also unaffected by build-up due to the self-cleaning effect of sensors. Suited for explosion hazardous areas. Maximum measuring range in liquids 10m (33ft), solids 5m (16ft).

Potentiometric

Measuring principle
Ultrasonic

Characteristic / Application
Separated version with field housing or top hat rail housing for control cabinet instrumentation, 300 m in-between sensor and transmitter

Supply / Communication
4-wire (HART, PROFIBUS DP)

Accuracy
+/- 2 mm + 0.17% of measured distance

Ambient temperature
-40 °C ... 80 °C
(-40 °F ... 176 °F)

Process temperature
-40 °C ... 80 °C
(-40 °F ... 176 °F)

Process pressure / max. overpressure limit
0.7 bar ... 4 bar abs
(10 psi ... 58 psi)

Main wetted parts
PVDF (fully welded IP68 / NEMA6P)

Process connection
G / NPT 1"

Blocking distance
0.3 m (1 ft)

Max. measurement distance
Liquids: 10 m (33 ft),
Solids: 5 m (16 ft)

Communication
Transmitter:
4 ... 20 mA HART
PROFIBUS DP

Certificates / Approvals
ATEX, FM, CSA, IEC Ex, INMETRO, NEPSI, UK Ex

Options
Second 4...20 mA output

Components
Transmitter:
FMU90, FMU95

Application limits
Foam / high turbulence possible:
FDU92
Flange-flush assembly:
FDU91F
For tank farms scanner:
FMU95