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Aalborg has announced the launch of the digital paddlewheel flowmeter.

Fluid flowing through the unit causes the digital paddlewheel to spin.

As the magnets embedded in the paddle spin past the sensor, electrical pulses are produced in which frequency is proportional to the flow rate.

The number of pulses per desired time interval and the K-factor (number of pulses/gallon) make it possible to calculate the flow rate and volume passing through the unit.

On-board CPU and signal conditioner circuitry perform accurate flow and total computation, digital communication and analogue 0-5VDC or 4-20mA output signals.

Non-volatile memory stores all hardware-specific and user-programmable variables, including flow-linearisation table.

The flow rate can be displayed in 29 different volumetric or mass flow engineering units.

Flowmeter parameters and functions can be programmed locally via key pad and LCD; or remotely via the RS-232/RS-485 interface.

PWE flowmeters support various functions including: two independently programmable flow totalisers; user-programmable low, high or range flow and temperature alarm; two sets of user-programmable optically isolated outputs; self-diagnostic alarm; and flow pulse output.

Optional local 2 x 16 LCD readout with adjustable backlight provides flow rate, temperature, total volume reading in currently selected engineering units, diagnostic events indication and features a password-protected access to the process parameters to ensure against tampering or resetting.

The total volume of the liquid is calculated by integrating the actual liquid flow rate with respect to time.

The optional LCD/keypad and digital interface commands are provided to: set the totaliser to zero; start the totaliser at a preset flow; assign action at a preset total volume; start/stop totalising the flow; and read totaliser.

High and low flow alarm limits can be pre-programmed via digital interface or optional LCD/keypad.

Alarm conditions become true when the current reading is equal or higher/lower than corresponding values of high and low alarm levels.

Alarm action can be assigned with preset delay interval (0- 3,600 seconds) to activate the optically isolated output (separate for high and low alarm).

A latch mode control feature allows each optical output to be latched on or follow the corresponding alarm status.

Two sets of optically isolated outputs are provided to actuate user-supplied equipment.

These are programmable via digital interface or optional LCD/keypad such that the outputs can be made to switch when a specified event occurs (for example, when a low or high flow alarm limit is exceeded or when the totaliser reaches a specified value) or may be directly controlled by user.

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