Open Channel flowmeter

Endress and Hauser’s ultrasonic level unit, the FMU90 can also be used to measure flow rates in open channels.

Flow rate measurement in open channels with flumes
Features and Benefits
• Up to 3 totalizers and 3 (resettable) counters;
optionally resettable via digital inputs
• Counting or time pulse output for control of external
• Simple, menu-guided operation with 6-line plain text
display; 15 languages selectable
• Envelope curves on the display for quick and simple
• Easy operation, diagnosis and measuring point
documentation with the supplied Endress+Hauser
operating program “FieldCare”.
• Option: four digital inputs (e.g. for pump feedback)
and one external temperature input
• Time-of-flight correction via integrated or external
temperature sensors
• Linearisation (up to 32 points, freely configurable)
• Linearisation tables for the most common flumes and
weirs pre-programmed and selectable
• Online calculation of the flume-/weir-flows via
integrated flow curves
• Pre-programmed pump control routines
• System integration via HART or PROFIBUS DP
• Automatic detection of the sensors FDU9x
• The sensors of the series FDU8x can be connected (for
certificates see note
• Flow measurement in open channels and measuring weirs with 1 or 2 ultrasonic sensors
• Simultaneous measurement of level and flow in a stormwater overflow basin with only 1 sensor
• Flow measurement with back water detection (2 sensors) or sludge detection

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