If the OHMIC circuit closure is correctly signalled then the detection
function can be tested identically to the floating head:
The disadvantages of the touch-trigger system are unreliability in the
case of dirty materials and high sensitivity to splashing of the torch with
metallic dust (from cutting), which can short-circuit the nozzle, closing the
circuit and blocking further operation. The system has the ability to
automatically purge the torch if a short circuit is detected before a
measurement is attempted. The OHMIC Auto purging out function is
found in the special functions :
For sources without HF/HV ignition, it is possible to reduce the
sensitivity of the OHMIC system by mounting a 15k potentiometer in
series.
simple option for making an ohmic element
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