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Apollo Flow Measurement
Ltd
Charles Street
Walsall
WS2 9LZ
Tel 01922 645647
Tel 0800 3286674
Tel +44 1922 645647
sales@apolloflow.co.uk
ELECTROMAGNETIC FLOWMETER
The Toshiba
LF410 electromagnetic flowmeter accurately measures the flow of almost any
conducting liquids including foods, pharmaceuticals, pulps and slurries with
suspended solids.
Cost effective
Wide range
High accuracy
No
obstruction to flow
Highly resistant ceramic lining
Easy to set up
Good stability and noise suppression
Application
Electromagnetic flowmeters are ideally suited for most
conducting liquids including aggressive, abrasive and corrosive liquids and
those containing solids. The bore of the flowmeter is smooth with no
obstruction to flow hence the pressure drop is low. The measurement is
independent of pressure, temperature, density, conductivity (above certain
limits) and viscosity. Typical applications are for the measurement of
chemicals, pharmaceuticals, pulp, foods, acids, alkalis, dyes, waste water and
liquids containing solid matter.
Principle of Operation
The flowmeter consists of two parts: a detector which is
mounted in the pipeline and through which the measured liquid flows, and a
converter which may be mounted either integral with the detector or separately.
The converter conditions and outputs the electrical signal from the detector.
The measuring principle is based on Faradays Law of Electromagnetic Induction
which states that if an electrical conductor, in this case the measured liquid,
passes through a magnetic field a small electromotive force (EMF) is induced
perpendicular to the field and flow. This EMF is proportional to the average
flow velocity and is detected by two electrodes mounted in the wall of the
detector and then fed to the converter. The divided multi sampling and noise
suppression provides superior accuracy and stability. Presence of deposits on
the electrodes have no effect on the zero point as long as some part of the
electrode is exposed. The coil arrangement of the flowmeter is such that uneven
flow can be measured correctly. The functional magnetic field distribution
technique and the reduced number of components result in improved flow
measurement efficiency and reliability.
Construction
The stainless steel construction is durable and gives
excellent corrosion resistance. The rotor is machined from solid making it
virtually indestructible. The sleeve bearings provide you with highly reliable
performance over long periods.
Calibration
The flowmeter can be set to any flow range between the
minimum and maximum flow ranges in the following table. A test certificate is
issued for each flowmeter and the amplifier output is set to customer
requirements.
Installation
The flowmeter can be mounted in any plane but should be
maintained full of liquid at all times. For vertical installations flow should
be upwards and in all cases the electrodes should be horizontal. This flowmeter
has a short inlet-to-outlet length and should be installed with between five
and ten pipe diameters upstream. No downstream diameters are required. The
LF410/LF400 is a combined detector and converter. The LF410 can be mounted
separate to the LF420 converter for remote mounting.
Flow Ranges
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Detector Specification
| Size: | 15 to 400 mm diameter |
| Flow velocity: | Lowest range 0 to 0.3 m/s Highest range 0 to 10 m/s |
| Fluid pressure: | -1 bar up to the flange rating |
| Fluid temperature: |
-10 to 80 oC for EPDM lined -10 to
120oC PTFE or ceramic lined -10 to 180oC for ceramic lined and separate converter |
| Accuracy: | See the table below |
| Conductivity: | Minimum 5 microS/cm required |
| Connections: | Wafer 15 - 200 mm |
| Flanges for 15 - 400 mm | |
| Hygienic 25 - 100 mm | |
| Flange Specs: | ANSI 150,300 ND16,40 |
Converter Specification
| Display: | 2 line 16 character dot matrix backlit LCD display |
| Current output: | 4-20mA (max load 1 k W) |
| Digital output DO1: | Transistor open collector |
| Capacity: | Maximum 30V dc 200mA |
| Digital output DO2: | Solid state relay |
| Capacity: | Max 50V dc 150 mA |
| Pulse output: | (DO1 only) 3.6-3600000 pulses/hour. Pulse width of 0.5 - 100 ms |
| DO1 or DO2 can be used for the following: |
Flow alarm output: High and low limit alarm
Empty pipe output: Alarm output for empty pipe Preset point output: Output signal for when a preset quantity has been reached |
| Digital input: | 20 - 30 V dc signal |
| Digital input can be set for: | Multi range: 4-range switching to increase
accuracy Totaliser control: Start, stop and reset totaliser |
| Communications: | A digital signal conforming to the HART protocol is superimposed on the 4-20mA signal |
| Protection: | IP67 (NEMA4) |
| Temp range: | -10 to +60 oC |
Intrinsically Safe Version
The flowmeter can be mounted in the hazardous
area.It is approved to FM Class 1 Division 1
Power Supply
| Mains: | 100 to 240 V ac 50/60 Hz |
| DC: | 24 V dc (allowable 20.4 -28.8V) |
| Surge protection: | Surge protectors are installed in the power supply and current signal output circuits. |
| Power consumption: | Approx. 10W |
Materials of Construction
| Converter case: | Aluminium alloy |
| Coating: | Pearl-grey acrylic resin |
| Cable connection: | 11-13mm cable gland |
To see available data sheets and manuals click here: Download Area
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