Diverse MF500M+ Podręcznik użytkownika - Strona 12

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Calculation of Magnetite from MF500M+ readings

Placing the probe on any point on the surface of the pipe

slowly move the probe around the surface of the pipe keeping

the face of the probe at a tangent to the pipe surface. noting

the points where the reading is the highest and lowest S

max

and S

min

Now you need to decide whether the magnetite is coating the

whole of the inside surface of the pipe or just a sector (as

would happen with a horizontal pipe where either flakes of

magnetite have accrued or the water has not fully filled the

pipe). From the analysis we have done, if the ratio S

max

min

1.5 then the accrual might be deemed to be evenly coated.

Starting at the point where the signal is a maximum (S

)

max

with a chalk mark to indicate this position, slowly move the

probe round the pipe maintaining the probe at a tangent to the

pipe surface until the signal has fallen to S

/2. Mark the pipe

max

again. Repeat the procedure in the other direction. In each

case note the angle from the S

position take the average of

max

these as θ (the half angle).

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