nuckolls.bob(at)aeroelect
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 Posted: Mon Sep 23, 2013 5:40 am Post subject: How to Correctly Implement Pitot Heat Current Sensor |
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I have the components to put together the Pitot Heat current sensor but I am not completely sure I have interpreted the diagram correctly. The biggest issue is the two extra pins on the Reed Switch that are shown to have a resistor between then in the schematic supplied with the part. As best as I can tell those two pins are not used so I should be able to clip them off and forget them. My best guess of the detailed schematic for the sensor is shown in the graphic below. If I have it right then fine, I can go ahead and fabricate the part. If not then please enlighten me so I do not end up with a sensor that does not work.
[img]cid:7.1.0.9.0.20130923083804.020d1008(at)aeroelectric.com.3[/img] |
The Radio Shack 275-232 is a 12 volt, .5A reed RELAY.
[img]cid:7.1.0.9.0.20130923083804.020d1008(at)aeroelectric.com.4[/img]
The two EXTRA pins are for the 12 volt coil wrapped around the
reed switch capsule. The project you're crafting converts the
relay from a VOLTAGE operated device to a CURRENT operated
device by ADDING a second coil of a few turns that are hooked
in series with the load to be monitored.
There are a number of load sensing relays used on type
certificated ships. They start with a rudimentary reed
switch capsule and add the current coil around it.
[img]cid:7.1.0.9.0.20130923083804.020d1008(at)aeroelectric.com.5[/img]
These capsules are quite fragile and not easy to work
with. So using a pre-packaged capsule in an assembly
offers some reduction in risks for damage.
The short answer to your question is, ignore the
two pins that are attached to the voltage coil. |
Bob . . .
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