for flow measurement based on the Doppler principle
For ultrasonic flow measurement of slight to heavily polluted media in part filled an full pipes and channels. Complete measurement system in connection with KDA sensors
General Description
The OCM F flow metering system utilises a fully bidirectional ultrasonic velocity sensor.
The intelligent Doppler sensor detects and directly evaluates the flow velocity. Other than with mag meters, this method has an absolutely stable zero point. Moreover, the dynamic measurement range for minimum level and flow is very high. Level measurement can be carried out either by a sensor-integrated pressure cell or by using an external sensor.
Operation / Programming
Thanks to the intuitive user interface it is very easy to set up the OCM F for the requirements of various applications. Additional input devices like Computers etc. are not needed. Programmed settings are indicated clearly.
Measurement principle
The measurement principle is based on the classic Doppler method where an ultrasonic signal with a defined frequency is transmitted into a liquid at a known angle. A portion of the ultrasound energy is reflected by the solid particles or gas bubbles carried with the liquid. Due to the movement of the particles a frequency distortion occurs which is direct proportional to the particle velocity. The flow velocity can be determined from this frequency shift subsequently. From the flow profile and the multitude of reflecting particles a frequency spectrum results. This spectrum, suitable for hydraulic assessment of measurement places, can be indicated on the OCM F display. The newly developed intelligent Doppler sensor directly detects and evaluates the flow velocity.
Memory
The internal memory enables storage of medium velocity information as well as temperature and flow data. With the frontside USB socket measurement data as well as settings can be read out. The free NivuSoft measurement data software enables easy visualisation of readings.
Typical OCM F applications
| Common | |
|---|---|
| Power supply | 100 to 240 V AC, +10 %/ -15 %, 47 to 63 Hz
or 24 V DC +/- 15%, 5% residual ripple
|
| Power consumption | AC: 7 VA typical, DC: 6 W typical |
| Enclosure | -Material: Polycarbonate
-Weight: ca. 1200 g -Protection: IP 65 -Installation: wall or DIN rail mounting
|
| Ex-Approval | II (2)G [Ex ib Gb] IIB |
| Operating temperature | -20 °C to +60 °C / with Ex: -20 °C to +40 °C |
| Storage temperature | -30 °C to +70 °C |
| Max. humidity | 90 %, non-condensing |
| Operation | 6 keys, menus in German, English, French and Polish |
| Inputs | -1 x 4 – 20 mA for external level (2-wire probe)
-2 x 0/4 – 20 mA with 12 bit resolution for external level and external setpoint -4 x digital input -1 active compact Doppler sensor Type KDA connectable
|
| Outputs | -3 x 0/4 – 20 mA, load 500 Ohm, 12 bit resolution,
accuracy 0.1 % (after calibration) -5 relay (SPDT), max. load 230 V AC / 2 A (cos. 0.9
|
| Controller | 3-step controller, quick close function, adjustable slide valve position in case of error |
Allows high accurate flow measurements using the transit time method according to IEC 60041 for part filled and full pipes, open channels and water bodies. Up to 8 measurement paths
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