Westack Fuel Senders

[speedwing]

I would like to know if i need a converter to connect my sender to my
dynon EMS-100. My sender have 3 wires 12 volts-output-ground.
I try to verify what kind of signal at the output.
It`s not ohms and not a voltage. :-/



Pierre

 

[dynonsupport]

If it outputs a variable resistance, no converter needed. It will work directly. This sounds a tad unlikely given that it's powered.

If it outputs a variable voltage within 0-5v, then it will also work directly connected to the EFIS.

If it outputs a variable pulsed voltage (a frequency output), it won't work at all.

Our capacitance-to voltage converters are designed with a singular purpose in mind - to convert measured capacitance (particular from the plates in RV tanks) to a voltage output. They will not convert voltages, resistances, or frequency outputs.

 

[philipp_steinbach]

We have the same Westach sensors.
When we connect the sensors to 5V excitation line, all other values are fine, but fuel calibration does not work (factor indicated 428 and does not change at all, no matter how much poured in).
When we connect the sensors to 12 V, all other values go crazy: ManP 52´´, CHT (on ground, cold engine) 280F and so on.

Any ideas?

 

[dynonsupport]

If you put 12V into the EMS, you'll mess everything up, as you have seen. This is expected. We only work with 5V sensors.

It sounds like the Westach senders are 12V units and won't work with the EMS. We're used to resistive senders that need no power, so what you have is unique.

 

[John_NZ]

I am useing a pair of westach 395-5s sensors with my D-120 and they work fine. The sensors require a 12V input from the same switched supply that powers the Dynon and Fuel Flow senders etc. The output is 0 to 5v ( 0v empty & 5V full) and these are  connected to the D-120 Fuel Level Inputs.
I have one question. I have a third tank also fitted with the same type of sensor and would like somebody to tell me whether I can connect this to one of the General Purpose Inputs? I am stuck with these senders after changing from a Blue Mountain system to Dynon.
John
New Zealand

 

[dynonsupport]

It depends on how the sender drives the output, so the best answer we can give is "maybe". It won't hurt to try it though - you won't hurt anything; it just may not work.