Cost effective device for sophisticated level measurement in liquids and bulk solids for up to 5m. Two-wire or four-wire instrument for continuous non-contact level and flow measurement. Process connection: Thread. Temperature: -40 to +80°C (-40 to +176°F). vPressure: +0.7 to +3bar (+10 to +44psi). Maximum measuring distance: Liquids 5m (16ft), Solids 2m (16ft). Blocking distance: Liquids and Solids 0.25m (0.8ft). International explosion protection certificates.
Benefits
- Reliable non-contact measurement
- Quick and simple commissioning via menu-guided on-site operation with four-line plain text display, 7 languages selectable
- Envelope curves on the on-site display for simple diagnosis
- Hermetically sealed and potted sensor
- Chemically resistant sensor out of PVDF
- Calibration without filling or discharging
- Integrated temperature sensor for automatic correction of the temperature dependent sound velocity
Measuring principle
Ultrasonic
Characteristic / Application
Compact ultrasonic transmitter
Supply / Communication
2-wire HART
Accuracy
+/- 2 mm or +/- 0.2 % of set measuring range
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 … 3 bar abs
(10 psi … 44 psi)
Main wetted parts
PVDF
Process connection
G / NPT 1 1/2″
Blocking distance
0.25 m (0.8 ft)
Max. measurement distance
Liquids: 5 m (16 ft),
Solids: 2 m (6.6 ft)
Communication
4…20 mA HART
Certificates / Approvals
ATEX, FM, CSA, IEC, INMETRO, NEPSI
Application limits
For higher resistance:
FMU42/FDU9x
Foam / high turbulence possible:
FMU41/FDU91
Fast filling and discharging rate:
FMU90 + FDU9x
Level limit detection:
FMU90 + FDU9x
Features
- Non-contact level measurement using time-of-flight (ultrasonic) principle — suitable for liquids, pastes, coarse bulk materials and also flow measurement in open channels or weirs.
- Available as a 2-wire or 4-wire compact transmitter.
- On-site display: 4-line plain-text menu in 7 languages for commissioning and diagnostics. Envelope (echo) curve display for troubleshooting echoes.
- Linearisation function (up to 32 points) so measured value can be converted into units of length, volume or flow.
- Sensor wetted parts: PVDF — chemically resistant.
- Built-in temperature sensor for automatic correction of sound velocity (important for accurate measurement).
