IFM Electronic Efector 500 PS7570 Notice D'utilisation page 35

Technical information (pneumatic system)
Maximum measuring
range
Minimum measuring
range
A: nozzle surround
the measuring tube (e.g. using a valve, logic OR function, possibly
combined with a backpressure valve) and simultaneously switch off
the primary pressure supply at the measuring block.
1
The measuring distance between backpressure nozzle(s) and workpie-
ce / contact surface should not exceed a maximum distance. In gene-
ral the following applies: A
le(s).
The following reference values apply (determined under laboratory
conditions):
Backpressure
Number of nozzles / max. measuring range [mm]
nozzles
1
(∅ in mm)
1.0 0.12
1.1 0.30
1.2 0.40
1.3 0.50
1.4 0.60
1.5 0.70
2.0 0.80
*Air quantity limited by orifice in the measuring system
In case of very small gap distances / nozzle diameters please note:
• The air must be allowed to vent at the detection surfaces.
• The pressure change between the conditions "contact surface present" /
"contact surface absent" must at least amount to 10...20 mbar.
• The hysteresis set for the pressure sensor must be inferior to the
pressure change between "contact surface present" and "contact
surface absent".
For the detection of gap distances of less than 0.03 mm the following
may be advisable.
• Relocate the openings of the nozzles backwards by 0.02 ... 0.05 mm
(fig. 4).
• Ensure sufficient space surrounds the nozzle openings (fig. 5).
Attention: Airflow should be possible, the coolant should not be
pressed into the backpressure nozzles.
4
2
≤ ¼ diameter of the backpressure nozz-
max
2
0.12
0.30
0.40
0.40
0.40
0.40
0.40
5
3
3 4
0.12 0.12
0.30 0.30
0.30* 0.20*
0.25* 0.15*
0.20* 0.10*
0.20* 0.10*
0.20* 0.10*
A
Page 35