Flow Measurement

Open Channel Flow Meter

OCM (With Ultrasonic Level Measuring)

OCM open channel flow meter with ultrasonic level measurement levelwizard II


The LevelWizard II Open Channel Flow Meter (OCM) is a state-of-the-art ultrasonic flow metering and control system which provides comprehensive flow monitoring with data logging and control functions for a complete range of flumes, weirs and channels. It has been designed to provides maintenance-free fit and forget performance.

Three user definable control relays with individual set points and intelligent performance-logging software features ensure the unit has maximum control versatility.

The OCM system utilities the unique DATEM software (Digital Adaptive Tracking of Echo Movement). This is an entirely new digital mapping technique developed especially for the iSOLV range which gives the system edge when identifying the “true target level” in the face of competing echoes from pipes, pumps or other obstructions.

OCM open channel flow meter levelwizard II applications picture

  • The LevelWizard II Open Channel Flow Meter (OCM) can show level, space, distance, head or flow on the display.
  • The relays can be programmed to activate alarms, pump starters, or other control equipment. There is an isolated 4-20 mA output that can be connected to a chart recorder or PLC, to monitor level space or distance, independently from that shown on the display.
  • There is an RS232 port, so that the LevelWizard II Open Channel Flowmeter can be operated remotely by a PC or other equipment.
  • The LevelWizard II Open Channel Flow Meter (OCM) can be programmed either by the built-in keypad or byusing the Remote Communicator (optional) or by PC via the RS 232 Serial Interface (optional).
  • One Communicator can program many iSOLV OCM units.
  • All the parameters are stored in non-volatile memory, so are retained in the event of power interruption. A second backup copy of all parameters can also be retained in the LevelWizard II Open Channel Flowmeter, in case a previous set of parameters needs to be restored.

Open Channel Flow (OCM) Measurement
It has been specifically designed to measure influent and effluent water flow from all types of municipal and industrial treatment plants.


WeightNominal 1 kg
Transducer CableTwin Screened
Maximum Separation500 m
Cable Entry Details10 cable entries – 5 x M20, 1x M16 underside, and 4 x 18mm at rear
Enclosure240 x 184 x 118 mm, Polycarbonate, flame resistant to UL94-V2
IP RatingIP 65
Max. & Min. Temperature-20°C to 55°C


Accuracy0.25% of the measured range or 6 mm (whichever is greater)
Resolution0.1% of the measured range or 2 mm ( whichever is greater )
Max. Range3meters (dB3 transducer), 6 meters ( dB6 transducer ), 10 meters ( dB 10 transducer )
Min. RangeDependent on transducer
Reading ResponseFully adjustable

Echo Processing

DescriptionPatented DATEM (Digital Adaptive Tracking and ECHO Mapping)


Analogue OutputIsolated output of 4-20 mA or 0-20 mA into 500Ω (user programmable and adjustable) 0.1% resolution
Digital OutputFull Duplex RS232, Volt free contacts, number and rating 5 form ‘C‘ ( SPDT ) rated at 5A at 240 VAC
Display 6 digits plus 12 character text, plus bargraph with directionindicators, remote communicator identifier, and program/run/test mode indicators
Analogue Input0-20 or 4-20 mA for pressure sensor, velocity sensor
ProgrammingOn-board Programming: Integral keypad
PC ProgrammingVia RS232 RJ11 port
Programming SecurityVia Password ( User Selectable and Adjustable)
Programmed Data SecurityVia non-volatile RAM, plus backup
Power Supply115 VAC + 5% / -10% 50/60 Hz,
230 VAC + 5% / -10% 50/60 Hz,
18-36 VDC

 Note: Specifications are subject to change without notice