Diverse MF500M+ Manual de usuario
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MAGMETER MF500M+
MAGNETITE METER
USER MANUAL
Issue 230309
DIVERSE
CAMBRIDGE
ENGLAND
CB22 5EW
www.diverse-technologies.net
DIVERSE
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INTRODUCTION
FIRST TIME - QUICK START
OPERATION
OPERATION - OPTIONS
CALIBRATION AND PIPE OCCLUSION
MEASUREMENT TECHNIQUE
SPECIFICATION
LIABILITY
CALIBRATION AND REPAIR
DISPOSAL AND RECYCLING
Contents
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Thank you for purchasing MF500M+. Before using the unit,
please read these instructions carefully. If you are uncertain
about any aspect of its operation, please contact Diverse ,our
contact details are at the end of this manual.
The MF500M+ is designed to measure magnetite in non-
magnetic stainless steel pipes, particularly cooling pipes in
power stations.
The MF500M+ Magnetic Field Meter uses a force technique to
detect and estimate levels of magnetic material (particularly
magnetite) contained within stainless steel pipes. Because of
this, it is ESSENTIAL that the pipe walls are not magnetic.
Introduction
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The unit requires 4 AA cells which should be installed in the
battery compartment on the rear of the housing.
Measurements are made by bringing the flat area at the front
side of the probe into contact with the outside of the pipe. The
probe measures force and has correction for gravitational
force, but it is good practice to zero the probe in the same
orientation as the measurement.
1. Plug in the magnetite probe.
2. Load the AA batteries in to the battery compartment
ensuring that the polarity is correct
3. Press the ipower button, the unit will switch on.
4. Hold probe away from pipe and depress button on probe
until a long beep is heard (zero value stored)
5. Take probe to the pipe and press button on probe, a
double beep will indicate measurement has been taken.
For a more detailed description of functionality see the
operation section.
First time, quick start
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There are 4 buttons on the meter and one on the probe with
functions as given in table 1.
Button presses are accompanied by audible confirmation as
follows:
●single beep - menu select and at power on
●double beep - measurement recorded
●triple beep - unit powered off
●long beep - zero/offset value updated
Operation
Power ilong press to turn unit off, short press to
turn on
up 5 .scroll through records in <view records>
scroll through barrel menu
down 6 .scroll through records in <view records>
scroll through barrel menu
Tick aselect main menu item
If in <view records>
long tick to exit
Double press toggles backlight
Probe
button
black (probe) short press take measurement and record,
long press store current value as
zero/offset
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This is the normal mode of operation.
There are two display modes for this menu which can be
toggled using a long press on the up 5 or down 6 keys. Data
is updated approximately every second.
The first mode displays the measured value, currently stored
offset and signal (difference) on the bottom line. The next
available record number is shown on the top line.
The second display mode estimates the amount of pipe
occlusion based on the current measured and offset values
(note there are a number of assumptions in these estimates see
section on calibration).
Note that data displayed on the first of these display formats is
what is recorded on a short probe button press.
Press tick a to view stored records (4 records shown, 1 record
per line). Tick a toggles between the two display formats.
The default format is record number, measure value, stored
offset and signal (difference between measured and zero/offset).
Alternative format gives record number and signal.
Use the up 5 or down 6 keys to scroll through stored
records. Long press of up 5 or down 6 scrolls a page i.e. 4
records. Press long tick a to return to <Measure>.
Operation - Options
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Press tick a to clear records and set next record pointer to
start of memory. Reverts back to main screen.
Press tick a to see software version. To leave press up 5 or
down 6 keys.
The instrument has two calibration factors used when
estimating pipe occlusion, gain and packing factor. The
following section gives details on how these factors are
calculated.
This menu option gives the user the opportunity to modify the
calibration factors. Press tick a to see factors.
A long press on the up 5 or down 6 keys is used to select
the factor. The current selection is shown by the symbol >.
Press up 5 and down 6 keys to increase or decrease the
selected factor. With gain or packing selected press enter to
store the values and exit to the main menu.
To revert to the factory calibration press enter button with
default selected.
Operation - Options
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A magnetite sample was used for factory calibration, This is a
cuvette 1cmx1cmx1.5cm packed with magnetite flakes. A force
measurement is recorded with the centre of a long side of the
cuvette 5mm from the centre of the probe measurement
surface (to simulate a pipe wall thickness). This value is taken
for the factory calibration gain and the software assumes that
this value corresponds to an occlusion of 75% in a tube of
40mm inner diameter and 5mm wall thickness.
By measuring the mass of the cuvette the density of the
magnetite flake sample was calculated and compared to the
density of solid magnetite. This gave a packing factor of 48%.
This factor is used in the display of occlusion for solid
magnetite. Calibration settings can be altered using the
<Calibrate> menu. The calibration standard supplied is
designed to mimic the above, measurement should be on the
black side without the label.
The offset has been set to be nominally 0 counts with the
probe held horizontally. In the unlikely event that the offset
needs to be adjusted then this can be carried by adjusting the
potentiometer. Gently peel back the calibration label on the
probe to access the potentiometer. Using a small screwdriver,
clockwise will take the offset negative, anticlockwise will take
the offset positive. Replace the calibration label after
adjustment. Note that the meter’s range is nominally 0 to 2047
force units.
Calibration and pipe occlusion
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The meter provides a number that increases with the amount
of magnetite present. The following aspects should be noted:
1. The meter is corrected for gravity but it is good practice to
zero the meter, away from the pipe, in the same
orientation as the measurement to follow.
2. The meter is designed to work with a space between the
probe cap and magnetite. If the meter is too close to
magnetite (or indeed a ferritic sample) then a raw reading
of 2047 will be displayed.
3. Warning, magnetite distribution will effect the measured
value i.e. a small amount of material close to the probe
will give the same signal as a larger amount further away.
Magnetite tends to accumulate on the corners of cooling pipes
where the pipes turn from vertical to horizontal. At these
points the pipe fills up from the bottom rather than
homogeneously as per our occlusion calculations.
Under these conditions we would recommend probing the
underside, the side and the top of the pipe around the
circumference. Due to the proximity of other pipes the
underside and top of the pipes may not be accessible so we
recommend probing positions A, B and C in the Figure 2.
As the pipe fills up the signal is expected to increase on A first
then B and finally C.
Measurement technique
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We recommend that a number of pipes are surveyed and the
measurements correlated with magnet tests and x-ray data.
From these results a measurement rational should be evident
that allows pipes with a particular occlusion to be readily
identified using the meter. An alternative formal rote is
described in the following section.
Figure 2. Pipe measurement
Measurement technique
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