FDU91 Ultrasonic measurement sensor

Product Item : FDU91-RG1AA
Category： Level
Measuring Principle:Ultrasonic
Characteristic / Application:Separated version with field housing or top hat rail housing for control cabinet instrumentation, 300m in-between sensor and transmitter
Supply / Communication:4-wire (HART, Profibus DP)
Max. measurement:distance 10 m (33 ft)
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Ultrasonic measurement Time-of-Flight Prosonic FDU91

Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range
up to 10m)

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).

Benefits

Integrated temperature sensor for Time-of-Flight correction. Accurate measurements are possible, even if temperature changes are present
Hermetically welded PVDF sensor for highest chemical resistance
Suited for rough ambient conditions thanks to separate installation from the transmitter
(up to 300m)
Reduced build-up formation because of the self-cleaning effect
Integrated automatic sensor detection for transmitters FMU90/FMU95 for simple commissioning
Weather resistant and flood-proof (IP68)
Integrated heating against a build-up of ice at the sensor (optional) ensures reliable measurement

Field of application

Sensor for continuous, non-contact level measurement of fluids and of bulk materials in silos, on belts, stockpiles and in crushers. Also for flow measurement in open channels and at weirs. Typically used in measurements in low structural heights.

Process connection: Thread
Temperature: -40 to +80°C (-40 to +176°F)
Pressure: +0.7 to +4bar (+10 to +58psi)
Maximum measuring range: Liquids 10m (33ft), solids 5m (16ft)
Blocking distance: 0.3m (1ft)
International explosion protection certificates

Features and specifications

Continuous / Liquids

Measuring Principle	Ultrasonic
Characteristic / Application	Separated version with field housing or top hat rail housing for control cabinet instrumentation, 300m in-between sensor and transmitter
Supply / Communication	4-wire (HART, Profibus DP)
Accuracy	+/- 2mm + 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 absolute / 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	10 m (33 ft)
Output	Transmitter: 4 ... 20 mA HART Profibus DP
Certificates / Approvals	ATEX, FM, CSA, IEC Ex, TIIS, NEPSI
Options	Second 4...20mA output
Application limits	Foam / high turbulence possible: FDU92 Flange-flush assembly: FDU91F For tank farms scanner: FMU95
Components	Transmitter: FMU90, FMU95

Continuous / Solids

Measuring Principle	Ultrasonic
Characteristic / Application	Separated version with field housing or top hat rail housing for control cabinet instrumentation, 300m in-between sensor and transmitter
Supply / Communication	4-wire (HART , Profibus DP)
Accuracy	+/- 2mm + 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 absolute / max. overpressure limit	0.7 bar ... 4 bar abs (10 psi ... 58 psi)
Main wetted parts	PVDF (fully welded IP68 / NEMA 6P)
Process connection	G / NPT 1"
Blocking distance	0.3 m (1 ft)
Max. measurement distance	5 m (16ft)
Output	Transmitter: 4 ... 20 mA HART Profibus DP
Certificates / Approvals	ATEX, FM, CSA, IEC Ex, TIIS, NEPSI
Options	Second 4...20mA output
Components	Transmitter: FMU90

Liquids

Measuring Principle	Ultrasonic
Product headline	Version with separate transmitter in field housing or top hat rail housing Cost effective solution for open channel flow measurement in water / wastewater plants
Max. measured error	accuracy: distance measurement: +/- 2mm + 0.17% resolution: distance measurement: 1mm
Measuring range	max measuring distance up to 10m / 32ft
Max. process pressure	atm.
Medium temperature range	-40...80°C (-40...176°F)
Degree of protection	IP68
Display/Operation	Transmitter
Outputs	Transmitter: 4...20mA HART Option: second 4...20mA output
Inputs	Transmitter
Digital communication	PROFIBUS DP HART
Hazardous area approvals	ATEX IECEx FM CSA