Single Probe Selection

Model PMxx probes operate with a magnetic field across the sensor face that permeate through ferrous metal. The maximum thickness is limited by the metals capacity to saturate or absorb all the magnetic field. Therefore the diameter of each probe is proportional to the maximum thickness it is able to monitor.

Because the metal must make contact or be very close*, there are forces to overcome. We list them as breakaway and slide resistance force. Breakaway is the force needed to pull the metal straight away from the magnetic face. Slide resistance force is required to move metal across the face and overcome the magnetic pull. This force is approximately 20% of the breakaway force.

The table below shows a range for each probe.

Model	Pictorial	Thickness Range	Max. Sensing Range*	Opposing Forces	Dimensions
PM4 18-mm diameter		04 mm to .4 mm .0015" to .015"	<.2 mm	Maximum pull away force requires .65 Kg or 1.5 lb. To overcome slide resistance is .13 Kg or .286 lb.
PM10 30-mm diameter		.1 mm to 1.0 mm .004" to .040"	<.6 mm	Maximum pull away requires 3 Kg or 6.6 lb. To overcome slide resistance is .6 Kg or 1.32 lb.	Drawing
PM15 36-mm diameter		15-mm to 1.5-mm .006" to .060"	<.8 mm	Maximum pull away requires 7 Kg or 15.4 lb. To overcome slide resistance is 1.4 Kg or 3.0 lb.