2nd Baro Sensor question - gauge is weird...

General support questions and announcements for MS3. See also MS3 manuals.

Moderators: jsmcortina, muythaibxr

Post Reply
Targa44
Helpful MS/Extra'er
Posts: 144
Joined: Tue Jul 04, 2017 11:51 pm
Location: Pleasant Hill, Ca

2nd Baro Sensor question - gauge is weird...

Post by Targa44 »

My MS3.0 came with a 2nd Baro and today I tried to monitor the gauge to see what it does.... It 'clocks' between 80kpa and 100kpa (my minimum and maximum settings in "Gen'l Settings"). It's either on 80 or 100.

Can anybody explain why? What's it telling me - that it's not working?

thanks,

kj
Attachments
2018-02-16_11.47.33.msq
(284.58 KiB) Downloaded 23 times
Dennis_Zx7r
Experienced MS/Extra'er
Posts: 374
Joined: Thu May 26, 2016 1:25 pm
Location: Germany

Re: 2nd Baro Sensor question - gauge is weird...

Post by Dennis_Zx7r »

I would check for a loose contact on the hardware side. 80kpa is usually the minimum value you get when the sensor falls off, and 100kpa may well be the sensor value in case it works. Also, I'd set the maximum to at least 103kpa (average pressure at sea level, sensor inaccuracies) as to not max out during normal operation.
My project: Link
Targa44
Helpful MS/Extra'er
Posts: 144
Joined: Tue Jul 04, 2017 11:51 pm
Location: Pleasant Hill, Ca

Re: 2nd Baro Sensor question - gauge is weird...

Post by Targa44 »

thank you Dennis
Targa44
Helpful MS/Extra'er
Posts: 144
Joined: Tue Jul 04, 2017 11:51 pm
Location: Pleasant Hill, Ca

Re: 2nd Baro Sensor question - gauge is weird...

Post by Targa44 »

Yes... looks like malfunction. Now sits on 80 kpa after moving the upper limit in set-up to 105kpa.

kj
Dennis_Zx7r
Experienced MS/Extra'er
Posts: 374
Joined: Thu May 26, 2016 1:25 pm
Location: Germany

Re: 2nd Baro Sensor question - gauge is weird...

Post by Dennis_Zx7r »

To be sure, you double-checked the calibration?
My project: Link
billr
Super MS/Extra'er
Posts: 6828
Joined: Sun May 15, 2011 11:41 am
Location: Walnut Creek, Calif. USA

Re: 2nd Baro Sensor question - gauge is weird...

Post by billr »

Have you sucked on the baro sensor port to see how the reading responds? It's been quite a while since I saw your board, but it seems to me that a (WHT or ORG?) wire in there was clipped. Maybe the baro sensor isn't fully connected?
jsmcortina
Site Admin
Posts: 39587
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Re: 2nd Baro Sensor question - gauge is weird...

Post by jsmcortina »

Also, measure the voltage coming out of the baro sensor. That will determine if the sensor is faulty of if it is a wiring or calibration problem.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
Targa44
Helpful MS/Extra'er
Posts: 144
Joined: Tue Jul 04, 2017 11:51 pm
Location: Pleasant Hill, Ca

Re: 2nd Baro Sensor question - gauge is weird...

Post by Targa44 »

Okay to the above suggestions...

1st - Calibration... from the file above, I show the "Calibrate MAP/Baro" as Custom Sensor with 9.3 and 260 values. I have since input what my assumed very old firmware file had as MPX4250 with 10 and 260 values (this is the setting I currently have with the resulting gauge sitting on 80 kpa. Note: the very old firmware had the Barometric Correction on this same page as 147.0 At total vacuum(%) and -47 as Rate(%). I didn't include these #s because the new firmware suggests leaving at 0 (zero) values - noting in tooltips this was the OLD method. And, "Gen'l Settings" has the upper/lower kpa of 105 and 80.

Q - Is it worth trying with the older 147, -47 setting for Baro Correction on the Calibration MAP/Baro page?

2nd - check Baro response with some tubing... thanks Bill - tbd... maybe today.

3rd - check voltage... thanks James - tbd with #2 above. I've got an old, but good Fluke to check, but I'll have to figure out which contacts to test.

thanks very much,

kj
Post Reply