How to log the duty cycle of the valve in flow meter?

[5mall5nail5]

Hi all -

Just for my datalogging purposes I'd like to log what the injector is doing in the HFS-6 kit. I have a spare input on my DTA ECU that I can input to. This will give me a better idea of what my duty cycle curve is looking like out of the Aquamist vs my fuel injection duty cycle.

How can I log this? Thanks!

In the back of the manual there are pinouts for each device. You can find the 0-5v conditioned flow sensor signal on the FCM and log this.

[5mall5nail5]

Originally Posted by Howerton Engineering

In the back of the manual there are pinouts for each device. You can find the 0-5v conditioned flow sensor signal on the FCM and log this.

Thanks Jeff - you mentioned this but I was looking on the main controller, whoops.

Thanks a bunch!

Is it the yellow "Flow Sensor Output signal" or brown "PWM Valve Distribution Signal" wire?

[Richard L]

I think the signal you are looking for is the conditioned output of the flow sensor. Unfortunately it is not shown at the back of the page.

This signal is in the green connector (user port). Pin #4. Forth conenction, counting from the gauge side. You can get RJ45 plug and make you own logging connection.

The sensor voltage is as following:

- standby ........... ~0.5V
- span ........... 0.6 to 4.5V

you will priobably only read a sopan of 0.6- 3.5V because the signal is conditioned by the "SC" to display ~5-6 bar on the gauge.

Alternatively, It is possible to read the "RAW" signal but it will be in "pulsed" form. You have to use a "frequency" input on your logger. Also requires soldering work.

Thanks Richard.

[5mall5nail5]

Originally Posted by Richard L

I think the signal you are looking for is the conditioned output of the flow sensor. Unfortunately it is not shown at the back of the page.

This signal is in the green connector (user port). Pin #4. Forth conenction, counting from the gauge side. You can get RJ45 plug and make you own logging connection.

The sensor voltage is as following:

- standby ........... ~0.5V
- span ........... 0.6 to 4.5V

you will priobably only read a sopan of 0.6- 3.5V because the signal is conditioned by the "SC" to display ~5-6 bar on the gauge.

Alternatively, It is possible to read the "RAW" signal but it will be in "pulsed" form. You have to use a "frequency" input on your logger. Also requires soldering work.

Richard I just did this and had some weirdness -

I have a CAT5 cable with this pinout:



I am using the BLUE wire (positing 4 in the connector). When I hooked that up to an Analog input on my ECU, the gauge had full bars lit on the gauge with the engine off but ECU/etc on. I unplugged the cable from the USER port and the bars went off.

Is this not correct?

I'm not certain but I think when Richard says pin 4 counting from the gauge side of the controller that means pin 5 on your diagram the way the connector plugs into the controller.

[5mall5nail5]

Jeff - I can move it to that pin. The gauge port on the unit is to the left of the user port when looking at it head on, so I counted over 4 pins. They coincide with the drawing above - if thats incorrect I can move it I hope no damage occurred.

Sometimes it's confusing. If you take the connector int he picture above and flip it over it plugs in going downwards. In this case counting from left to right I think pin 5 in your drawing is right. Maybe Richard can confirm.

[5mall5nail5]

Hrm - should i try it? I don't want to damage anything. The gauge port is oriented opposite of the rest of the ports, so then maybe it is pin 5 if thats what Richard meant.