Hi All
I was recently asked about wiring up a Desynn indicator by a mechanical engineer who is not so conversant with electrical wiring. I thought that others might like to know too and to see how these items worked and what characteristics they have that make them suitable for an aircraft environment so I made a short video.
Cheers
James
By: jamesinnewcastl - 19th September 2017 at 22:09
Hi Vega
Sounds like you actually know more about the indicators than I do!
The transducers are a sort of rheostat I suppose, so probably similar to the one in the video.
The current taken by the system in the video is shown on the left hand display of the power supply – it looks like 50 to 60mA at 24V and around 10mA at 4.8V. 24V at 50mA is 480 ohms load.
If you parallel the two gauges (so 1 to 1 to 1 etc.) then they will read the same but will take twice the current from the transmitter, taking more current will make it run hotter but it may be that the device can take it – but feel the transmitter and check for that ‘hot’ smell! If the issue worries you, you can lower the supply voltage, as you can see in the video the voltage range can be quite wide.
Let us know if it all works!
Cheers
James
By: Vega ECM - 19th September 2017 at 21:45
Hi
Many thanks for this. I’m currently working up a Desynn fuel sensing system with a rheostat based transducer .
Will a single transducer drive two standard 600ohm gauges or do you need non standard gauges each with a lower resistance?
Also what’s the typical current draw of the system?
Many thanks in advance
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September 18, 2017 at 11:44 pm