4
User’s Guide 2018
Description
General
The SAFMAG ACP electromagnetic flowmeter is composed of two principle assemblies:
The meter flow sensor, which is mounted in the pipeline
The flowmeter signal converter, which is remotely mounted.
Flowtube (Sensor)
The pipeline section, or flowtube, is lined with an insulating material compatible with the
process liquid to be monitored. Two field coils are mounted on the flowtube, and these field
coils generate the electromagnetic field inside the pipe section. As conductive liquid flows
through this pipe section, a voltage is generated. In order to sense the voltage induced in the
process fluid, electrodes are inserted through the lining and flowtube. These electrodes are
chosen to be compatible with the process fluid.
Remote Electronics
The SAFMAG ACP signal converter provides pulsed AC coil excitation for the flowtube.
The ACP Hi-Puls is neither an AC Magmeter nor a pulsed DC Magmeter. The ACP Hi-Puls
combines the best from the AC and the DC pulsed systems. The Flowtube coils are powered
directly from the main supply but the power is controlled by switching 1 pulse every 1,5 cycles
for flowtubes >150mm and 1 pulse every 3,5 cycles for flowtubes <150mm. This switching
cycle creates a magnetic field nearly 2 times greater than a convential AC magmeter.
Flowtubes with pulsed AC excited fields are suitable for measuring the flow of slurries and
pulp mixtures.
In certain slurry applications, noise is generated as a result of particles impinging upon the
electrodes, and the higher frequency and voltage of the pulsed AC excited magmeter offers a
solution to these more difficult applications.
Paper stocks are more complicated, but the chemical additives found in various paper stocks
make it difficult to predict accurately whether or not noise will be a problem.
The ACP utilises a multi-tasking microprocessor to handle all functions simultaneously. The
Flowmetrix philosophy of producing easy-to-use instrumentation means that the unit can be
programmed in a matter of minutes, even without the instruction manual. The flow rate and
total are displayed continuously on a backlit LCD display, clearly visible through the viewing
window in the cast aluminium housing.
