At the moment I am working on reliable train speed indication in our coal rail receival. I am having issues in finding an appropriate instrument in deriving such readings. The first issue is in the resolution of the instruments I have found since our trains vary in speed between 0 and 2km/h most low speed radars will reach around 0.4km/h minimum and if possible I am chasing one that is able to reach as close to 0km/h as possible. The second issue I have encountered is the output signals of these instruments. Majority of our instruments are a 4-20ma and therefore our electricians are familiar with such. The radars I have found are either PWM or RS232, we are able to use converters but it would be ideal to stick with what is familiar to the electricians for simplicity. Is there any such instrument that would suit such requirements, or at least one of these?
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