Suunto 9 Baro FusedAltitude

vr2udt

@cosmecosta I suppose if there is no significant weather change, i.e., mercury relatively stable, in the duration of the exercise, manually setting the initial altitude reference may be more preferable, or leave it alone as you mentioned ascend/decend values are all we need to know. But if ambient pressure is changing drastically from weather, GPS assisted FusedAlti could come in handy. Seems the only way to turn off FusedAlti is to disable GPS, using it indoors as a pure baro based instrument.

Pavlas

Hi,
I have a very similar problem as @Jorcki
I mentioned it here.
Two days ago I tried to clean the sensor (I left the watch in water all night and in the morning I tried to clean it with a vinyl record cleaning brush, which is VERY gentle). The problem with the hairy graph is the same so far. But now I notice that the altitude changes by itself. I put the watch on the table tonight. It showed 271 meters. In the morning I picked it up and it still showed 271 meters. But within a second, the altitude dropped to 265 meters. Then with a shake, it changed again by a few meters.
Maybe I released some dirt that’s still in the sensor?
You recommend cleaning it with a baby brush. Should I use the brush to clean only the holes or reach inside the hole? (I assume not inside)

Mff73

@pavlas said in Suunto 9 Baro FusedAltitude:

Hi,
I have a very similar problem as @Jorcki
I mentioned it here.
Two days ago I tried to clean the sensor (I left the watch in water all night and in the morning I tried to clean it with a vinyl record cleaning brush, which is VERY gentle). The problem with the hairy graph is the same so far. But now I notice that the altitude changes by itself. I put the watch on the table tonight. It showed 271 meters. In the morning I picked it up and it still showed 271 meters. But within a second, the altitude dropped to 265 meters. Then with a shake, it changed again by a few meters.
Maybe I released some dirt that’s still in the sensor?
You recommend cleaning it with a baby brush. Should I use the brush to clean only the holes or reach inside the hole? (I assume not inside)

do a fridge test (search forum), if you baro sensor is sensible to temperature you may face this behaviour. I had this in the past with one SSU, even perfect cleaning didn’t change anything, sensor was defective and watch was changed.

Pavlas

@mff73 Thank you! The temperature looks fine to me. According to the graph, it’s running smoothly. No abnormalities.

freeheeler

@pavlas
@Mff73 suggests that you perform the fridge test. it doesn’t say if temperature shows correct. what it does is to make a defective baro sensor visible: when the temp changes and the altitude changes accordingly, then the baro sensor has issues.
If I remember correctly slight changes are normal, but massive changes would point to a baro sensor malfunction

Pavlas

@freeheeler Yeah, the watch is already in the fridge and cooling

Mff73

@freeheeler
Exactly this, I wrote this too quickly

Pavlas

So here are the results of the fridge test:

Altitude: 226 m
Pressure: 1037 hPa
Temperature: 29°C

After 30 minutes in the fridge
Altitude: 229 m
Pressure: 1037 hPa
Temperature: 5°C

After 30 minutes on the hand
Altitude: 221 m
Pressure: 1036 hPa
Temperature: 27°C

Egika

@pavlas looks ok to me.
But both “hairy graph” plus “shaking leads to altitude change” makes me think the baro sensor is influenced by movement.
Maybe something loose inside (either parts of the sensor or debris).
This is nothing you could probably repair yourself. If soaking the watch and flushing it under running water does not help, I would send it in for service…

Pavlas

@egika Thanks! I’ll try a few more cleanings in water and night bath.
I’ll try a baby toothbrush (hopefully my daughter won’t see me).
And just to be sure, I’ll ask again - should I use the brush to clean only the holes or reach inside the hole?

isazi

@pavlas I never reach inside, just clean the holes.

freeheeler

@pavlas
when she sees you, next time you say: go and brush your teeth, she’s cleaning her watch
…sensitive question regarding putting things into the baro holes… I have a very soft toothbrush (similar to kids toothbrushes) and cleaned the holes without thinking how deep the brushes go… I assume it does not harm.
In my simple imagination sand grains entering this holes are more harmful than a baby toothbrush. I use my watch for surfing… and with the wipeout a lot of sand is swirled, too. (usually I wipeout more than I surf…)

freeheeler

@isazi
really? but the sensor sits so close to the holes… I suspect that I reached it more than once with the soft tips of the brush

EDIT:
here’s to imagine how soft my watch cleaning brush is

isazi

@freeheeler meaning I don’t push the bristles inside forcefully, they probably reach inside a little bit though.

Egika

@freeheeler official statement will always be: “do never put anything into the holes”
And recommending to do so is maybe not the best idea.
Even if your toothbrush is the softest on earth…

So let’s keep it a “don’t reach inside with anything”, you have no idea what people do…

(btw: I have also used a toothbrush to clean the S7 holes)

Pavlas

@egika @isazi @freeheeler Ok, thank you guys!

freeheeler

@egika
…like: scratch the dirt off the sensor with a rusty needle…
agreed: don’t reach inside!

actually soaking and rinsing should be sufficient

sartoric

If the brush is soft, you clean it softly, the life is soft, and soft is soft, everything will be fine … and soft

Usually a couple of warm bath solve the issue