12
3.6 Sensitivity Table
The currently selected sensitivity is indicated by means of the four horizontally
arranged yellow LEDs at the front plate.
Example: After pressing of F1+ or F2- buttons the diodes 3 and 4 light for
approximately 5 seconds. The actual values of response sensitivity is 2.5 mm.
This corresponds to stage 6, i.e. very insensitive.
A metallic particle is discharged only if it is greater or equal the currently selected
value.
Hence, the four LEDs serve for fine adjustment of sensitivity and as help for
orientation. (Refer to table below.)
As described in chapter 5.1.1, the sensitivity is indicated or changed by pressing
F1+ or F2-, if the keys are not locked.
The sensitivities apply to the most insensitive section of the detector which, for this
system, is in the centre. The sensitivity increases towards the edge.
X = Led lights
Sensitivity
stage
FE-ST 37 bullet
diameter
(mm)
50model/70model
LED 1 LED 2 LED 3 LED 4
1
(most sensitive)
from 0.5 / 0,7
X
2
from 0.6 / 0,8
X
X
3
from 0.7 / 1,1
X
4
from 0.9 / 1,5
X
X
5
from 1.2 / 1,8
X
6
from 1.6 / 2,5
X
X
7
(most insensitive)
from 2.0 / 3,2
X
Notice:
Being coated with material is insignificant for the detection accuracy.
Nonmagnetic metals influence the ring coil’s magnetic field less than magnetic ones.
Hence, reduced response sensitivity has to be expected for such metals.
For non-ferrous metals applies: The FE St37 value from the table multiplied by 1.3 is
the approximate response sensitivity of a non-ferrous metal bullet.
