Author Topic: Sainlogic 310 Barometric pressure settings  (Read 2619 times)

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Offline leonardus68

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Sainlogic 310 Barometric pressure settings
« on: June 14, 2021, 07:09:05 AM »
Hello,
I started to calibrate my weather station by comparing the nearest airfield, 700 meters, METAR relative pressure with my console relative display pressure; found a 4.8 hPa difference (higher on the airport). Now, I reduced this difference from my console pressure relative pressure and have 2 question forward:
1. Do I move on and reduce more from my relative pressure console because of the altitude location of my weather station ?
2. My airfield is 13 meters bellow my altitude, how to manage this one further ?
Thanks pals.

Offline leonardus68

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Sainlogic 310 Barometric pressure settings
« Reply #1 on: June 14, 2021, 07:12:09 AM »
Hello,
I started to calibrate my weather station by comparing the nearest airfield, 700 meters, METAR relative pressure with my console relative display pressure; found a 4.8 hPa difference (higher on the airport). Now, I reduced this difference from my console pressure relative pressure and have 2 question forward:
1. Do I move on and reduce more from my relative pressure console because of the altitude location of my weather station ?
2. My airfield is 13 meters bellow my altitude, how to manage this one further ?
Thanks pals.

Offline Gyvate

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Re: Sainlogic 310 Barometric pressure settings
« Reply #2 on: June 14, 2021, 07:53:06 AM »
Hello,
I started to calibrate my weather station by comparing the nearest airfield, 700 meters, METAR relative pressure with my console relative display pressure; found a 4.8 hPa difference (higher on the airport). Now, I reduced this difference from my console pressure relative pressure and have 2 question forward:
1. Do I move on and reduce more from my relative pressure console because of the altitude location of my weather station ?
2. My airfield is 13 meters bellow my altitude, how to manage this one further ?
Thanks pals.
It's not about the altitude of the airport station. Just forget about it. The METAR station shows already the proper relative pressure at sea level with reference to its altitude.
BUT - once you have calculated the relative air pressure of your station (with the altitude of your station !), you enter the difference/offset into the relative pressure calibration so that the console shows exactly this value.
If you find that after having completed your primary calibration that your relative pressure shows a difference to your nearest METAR station and you want to adjust to it, now you enter the calibration offset into the absolute (!!) pressure calibration field !
« Last Edit: June 14, 2021, 07:56:14 AM by Gyvate »
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Offline leonardus68

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Re: Sainlogic 310 Barometric pressure settings
« Reply #3 on: June 14, 2021, 07:55:38 AM »
Hello,
I started to calibrate my weather station by comparing the nearest airfield, 700 meters, METAR relative pressure with my console relative display pressure; found a 4.8 hPa difference (higher on the airport). Now, I reduced this difference from my console pressure relative pressure and have 2 question forward:
1. Do I move on and reduce more from my relative pressure console because of the altitude location of my weather station ?
2. My airfield is 13 meters bellow my altitude, how to manage this one further ?
Thanks pals.
It's not about the altitude of the airport station. Just forget about it. The METAR station shows already the proper relative pressure at sea level with reference to its altitude.
BUT - once you have calculated the relative air pressure of your station (with the altitude of your station !), you enter the difference into the relative pressure calibration so that the console shows exactly this value.
If you find that there is a difference to your nearest METAR station and you want to adjust to it, you enter the calibration offset into the absolute (!!) pressure calibration field !

How to calculate the relative air pressure of my console ? (is this the relative pressure displayed on my uncalibrated weather station display) ?

Offline Gyvate

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Re: Sainlogic 310 Barometric pressure settings
« Reply #4 on: June 14, 2021, 07:57:17 AM »
Hello,
I started to calibrate my weather station by comparing the nearest airfield, 700 meters, METAR relative pressure with my console relative display pressure; found a 4.8 hPa difference (higher on the airport). Now, I reduced this difference from my console pressure relative pressure and have 2 question forward:
1. Do I move on and reduce more from my relative pressure console because of the altitude location of my weather station ?
2. My airfield is 13 meters bellow my altitude, how to manage this one further ?
Thanks pals.
It's not about the altitude of the airport station. Just forget about it. The METAR station shows already the proper relative pressure at sea level with reference to its altitude.
BUT - once you have calculated the relative air pressure of your station (with the altitude of your station !), you enter the difference into the relative pressure calibration so that the console shows exactly this value.
If you find that there is a difference to your nearest METAR station and you want to adjust to it, you enter the calibration offset into the absolute (!!) pressure calibration field !

How to calculate the relative air pressure of my console ? (is this the relative pressure displayed on my uncalibrated weather station display) ?
read further up in the thread  8-)
https://www.wxforum.net/index.php?topic=41842.msg428265#msg428265
you only use the absolute pressure shown on your console - then start the calibration as mentioned above
« Last Edit: June 14, 2021, 08:00:02 AM by Gyvate »
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Offline leonardus68

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Re: Sainlogic 310 Barometric pressure settings
« Reply #5 on: June 14, 2021, 08:12:43 AM »
Quote
It's not about the altitude of the airport station. Just forget about it. The METAR station shows already the proper relative pressure at sea level with reference to its altitude.
BUT - once you have calculated the relative air pressure of your station (with the altitude of your station !), you enter the difference into the relative pressure calibration so that the console shows exactly this value.
If you find that there is a difference to your nearest METAR station and you want to adjust to it, you enter the calibration offset into the absolute (!!) pressure calibration field !

How to calculate the relative air pressure of my console ? (is this the relative pressure displayed on my uncalibrated weather station display) ?
Quote
read further up in the thread  8-)
https://www.wxforum.net/index.php?topic=41842.msg428265#msg428265
you only use the absolute pressure shown on your console - then start the calibration as mentioned above
Relative pressure calculated with https://keisan.casio.com/exec/system/1224579725 (989.55) differs very much as calculated with http://www.meteo.tomkii.net/pressure_calc/ (1023.9)
« Last Edit: June 14, 2021, 08:13:18 PM by galfert »

Offline Gyvate

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Re: Sainlogic 310 Barometric pressure settings
« Reply #6 on: June 14, 2021, 08:30:56 AM »
OK - let's do it step by step (maybe different sites ask for different input ...)
what's the elevation of your place as per https://www.freemaptools.com/elevation-finder.htm ?
And how high is your console situated above ground ?
And what does your console (or sensor) show as absolute pressure ?
« Last Edit: June 14, 2021, 08:42:00 AM by Gyvate »
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Offline leonardus68

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Re: Sainlogic 310 Barometric pressure settings
« Reply #7 on: June 14, 2021, 08:33:23 AM »
OK - let's do it step by step (maybe different sites ask for different input ...)
what's the elevation of your place as per https://www.freemaptools.com/elevation-finder.htm ?
And how high is your console situated above ground ?
Elevation 199 + 1 meter from the ground= 200 meters.

Offline Gyvate

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Re: Sainlogic 310 Barometric pressure settings
« Reply #8 on: June 14, 2021, 08:57:49 AM »
From your earlier posts, your elevation seems to be around 700 m.
Then the keisan.casio.com tool would provide 933.15 hPa. Pressure at sea-level: 1013.15; difference = offset = 80 hPa.
In the relative pressure calibration field of your console you enter 80 hPa.
If there is a difference between your nearest METAR station and your relative pressure now showing on the console, take this difference and enter it into the absolute pressure calibration field (a negative difference i.e. METAR lower than your rel pressure on the console, would be entered with a "-" sign before the value). Now your relative pressure should equal the relative pressure measured by the METAR station - and you are done.
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Offline leonardus68

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Re: Sainlogic 310 Barometric pressure settings
« Reply #9 on: June 14, 2021, 09:00:05 AM »
From your earlier posts, your elevation seems to be around 700 m.
Then the keisan.casio.com tool would provide 933.15 hPa. Pressure at sea-level: 1013.15; difference = offset = 80 hPa.
In the relative pressure calibration field of your console you enter 80 hPa.
If there is a difference between your nearest METAR station and your relative pressure now showing on the console, take this difference and enter it into the absolute pressure calibration field (a negative difference i.e. METAR lower than your rel pressure on the console, would be entered with a "-" sign before the value). Now your relative pressure should equal the relative pressure measured by the METAR station - and you are done.
Error, you probably mistaken data. 700 meters is from my nearby airfield. I'm at 200 meters altitude (in TOTAL). And even so, I can't input more than a 9hPa which is the maximum. I guess here is a GREAT mistake somewhere but not from my part. Also just I said those 2 formulas are highly inconsistent each other.
« Last Edit: June 14, 2021, 08:22:02 PM by galfert »

Offline Gyvate

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Re: Sainlogic 310 Barometric pressure settings
« Reply #10 on: June 14, 2021, 09:02:03 AM »
OK - then you have
1013.15 - 989.55 = 23.6
You enter 23.6 (hPa) in
to your relative pressure calibration field.
Now look up your nearby METAR station.
The difference between their rel. air pressure and your relative air pressure (after entering the 23.6 hPa offset) you enter into the absolute pressure calibration field of your console.
Done !
Now both the METAR station and your console should show the same relative air pressure.
« Last Edit: June 14, 2021, 09:03:53 AM by Gyvate »
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Offline Gyvate

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Re: Sainlogic 310 Barometric pressure settings
« Reply #11 on: June 14, 2021, 09:06:09 AM »
Quote
[quote author=Gyvate link=topic=41842.msg431058#msg431058 date=1623675469
From your earlier posts, your elevation seems to be around 700 m.
Then the keisan.casio.com tool would provide 933.15 hPa. Pressure at sea-level: 1013.15; difference = offset = 80 hPa.
In the relative pressure calibration field of your console you enter 80 hPa.
If there is a difference between your nearest METAR station and your relative pressure now showing on the console, take this difference and enter it into the absolute pressure calibration field (a negative difference i.e. METAR lower than your rel pressure on the console, would be entered with a "-" sign before the value). Now your relative pressure should equal the relative pressure measured by the METAR station - and you are done.
Error, you probably mistaken data. 700 meters is from my nearby airfield. I'm at 200 meters altitude (in TOTAL). And even so, I can't input more than a 9hPa which is the maximum. I guess here is a GREAT mistake somewhere but not from my part. Also just I said those 2 formulas are highly inconsistent each other.
The just use different approaches.
Are you sure you can enter only 9 hPa or are these 9 inHg ?
What console do you have ?
« Last Edit: June 14, 2021, 09:10:15 AM by Gyvate »
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Offline leonardus68

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Re: Sainlogic 310 Barometric pressure settings
« Reply #12 on: June 14, 2021, 09:10:09 AM »
Quote
[quote author=Gyvate link=topic=41842.msg431058#msg431058 date=1623675469
From your earlier posts, your elevation seems to be around 700 m.
Then the keisan.casio.com tool would provide 933.15 hPa. Pressure at sea-level: 1013.15; difference = offset = 80 hPa.
In the relative pressure calibration field of your console you enter 80 hPa.
If there is a difference between your nearest METAR station and your relative pressure now showing on the console, take this difference and enter it into the absolute pressure calibration field (a negative difference i.e. METAR lower than your rel pressure on the console, would be entered with a "-" sign before the value). Now your relative pressure should equal the relative pressure measured by the METAR station - and you are done.
Error, you probably mistaken data. 700 meters is from my nearby airfield. I'm at 200 meters altitude (in TOTAL). And even so, I can't input more than a 9hPa which is the maximum. I guess here is a GREAT mistake somewhere but not from my part. Also just I said those 2 formulas are highly inconsistent each other.
The just use different approaches.
Are you sure you can enter only 9 hPa or are these 9 mmHg ?
What console do you have ?
Yes, only +/- 9hPa
Sainlogic 310

Offline leonardus68

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Re: Sainlogic 310 Barometric pressure settings
« Reply #13 on: June 14, 2021, 09:15:13 AM »
I think this weather station is a lot more accurate and these +/- max. 9 hPa is ONLY to DIRECT modify the relative pressure according the nearest METAR station WITHOUT any other calculations !!

Offline Gyvate

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Re: Sainlogic 310 Barometric pressure settings
« Reply #14 on: June 14, 2021, 09:23:23 AM »
Sorry, I meant inches (inHg).
Even though, 9 hPa for the absolute correction are usually sufficient, for the relative pressure this doesn't make sense.
The Sainlogic 310 should be a WH2910 clone.
in its manual is says:
6.9.2.1 Calibration Order:
1) Indoor temperature offset calibrated (range +/-5˚C, default: 0 degrees)
2) Indoor humidity offset calibrated (range +/-10%)
3) Outdoor temperature offset calibrated (range +/-5˚C, default: 0 degrees)
4) Outdoor humidity offset calibrated (range +/-10%)
5) Absolute pressure offset calibrated (± 10 hPa (± 2.95 inHg))
But by methodology you modify the absolute pressure to adjust the difference between your console relative measurement and the METAR.

The absolute pressure your pressure sensor shows is the pressure at your location (assuming it measures absolutely accurately).
The calculation provides what this means as a relative pressure at sea level.
The difference is the relative offset.
If there is a difference between your rel. pressure after calibration with the offset and the one of a nearby METAR station, the conclusion is that your absolute pressure was not measured/read exactly by your sensor, hence you correct the reading of the sensor (which measures only absolute pressure => offset for absolute pressure calibration).

Are you sure you operate your console properly ? Many people have calibrated a WH2910 (clone) before successfully with a relative offset greater than 10 hPa.
« Last Edit: June 14, 2021, 09:38:38 AM by Gyvate »
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Offline leonardus68

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Re: Sainlogic 310 Barometric pressure settings
« Reply #15 on: June 14, 2021, 10:24:48 AM »
Sorry, I meant inches (inHg).
Even though, 9 hPa for the absolute correction are usually sufficient, for the relative pressure this doesn't make sense.
The Sainlogic 310 should be a WH2910 clone.
in its manual is says:
6.9.2.1 Calibration Order:
1) Indoor temperature offset calibrated (range +/-5˚C, default: 0 degrees)
2) Indoor humidity offset calibrated (range +/-10%)
3) Outdoor temperature offset calibrated (range +/-5˚C, default: 0 degrees)
4) Outdoor humidity offset calibrated (range +/-10%)
5) Absolute pressure offset calibrated (± 10 hPa (± 2.95 inHg))
But by methodology you modify the absolute pressure to adjust the difference between your console relative measurement and the METAR.

The absolute pressure your pressure sensor shows is the pressure at your location (assuming it measures absolutely accurately).
The calculation provides what this means as a relative pressure at sea level.
The difference is the relative offset.
If there is a difference between your rel. pressure after calibration with the offset and the one of a nearby METAR station, the conclusion is that your absolute pressure was not measured/read exactly by your sensor, hence you correct the reading of the sensor (which measures only absolute pressure => offset for absolute pressure calibration).

Are you sure you operate your console properly ? Many people have calibrated a WH2910 (clone) before successfully with a relative offset greater than 10 hPa.
Nope, it isn't a clone of WS2910. Just resemble with. And I think I figure out how to calibrate. It's SO EASY. I take the 2 pressures from console, absolute and relative and substract them to see on what altitude was calibrated from factory. Gave me a difference 19.3hPa. Now I used the formula for my altitude and got the offset/difference of 23.7 hPa. Now it's a substraction between those 2 values which gave a 4.4 hPa offset. And from now i only to input this offset into the absolute pressure console calibration area.
That's all. Off course I will search to see the difference between my now calibrated console and the nearest METAR data.
Thank you a lot.

Offline gszlag

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Re: Sainlogic 310 Barometric pressure settings
« Reply #16 on: June 14, 2021, 10:42:36 AM »
I think this weather station is a lot more accurate and these +/- max. 9 hPa is ONLY to DIRECT modify the relative pressure according the nearest METAR station WITHOUT any other calculations !!

Calibrating barometric pressure for a new weather station owner can be a bit challenging but it is important to undestand some key concepts first

You have two pressures to be concerned about - Absolute Pressure and Relative Pressure.

Your weather station measures only Absolute Pressure(ABS) not Relative Pressure(REL).

Absolute Pressure is (or should be) the actual raw station pressure that your station is reading at your specific elevation.

Relative Pressure is a calculated number using an equation.

Your station elevation is 200 m and you want to compare to another barometer at 700 m. That's a significant difference in elevation and if you try to compare atmospheric pressures you run into trouble because the 700 m barometer will always be lower and you will be higher. The higher you go the less air there is therefore the lower the pressure.

Basically to put all weather stations in the world on the same footing (literally) you have to pretend that all weather stations are at the same elevation. In the case of Relative Pressure that is at sea level. The weather equation essentially, converts atmospheric pressure(Absolute Pressure) down to sea level elevation. When you do that calculation now you can compare Relative Pressures from station to station.

To do that calculation you have to calculate your fixed offset as gyvate described and add it to your ABS and then compare that result to your airport's METAR SLP reading. How you adjust ABS and/or REL to align with your METAR's SLP depends on the brand of weather station. An image of your calibration screen would be useful.
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Offline leonardus68

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Re: Sainlogic 310 Barometric pressure settings
« Reply #17 on: June 14, 2021, 11:30:14 AM »
I think this weather station is a lot more accurate and these +/- max. 9 hPa is ONLY to DIRECT modify the relative pressure according the nearest METAR station WITHOUT any other calculations !!

Calibrating barometric pressure for a new weather station owner can be a bit challenging but it is important to undestand some key concepts first

You have two pressures to be concerned about - Absolute Pressure and Relative Pressure.

Your weather station measures only Absolute Pressure(ABS) not Relative Pressure(REL).

Absolute Pressure is (or should be) the actual raw station pressure that your station is reading at your specific elevation.

Relative Pressure is a calculated number using an equation.

Your station elevation is 200 m and you want to compare to another barometer at 700 m. That's a significant difference in elevation and if you try to compare atmospheric pressures you run into trouble because the 700 m barometer will always be lower and you will be higher. The higher you go the less air there is therefore the lower the pressure.

Basically to put all weather stations in the world on the same footing (literally) you have to pretend that all weather stations are at the same elevation. In the case of Relative Pressure that is at sea level. The weather equation essentially, converts atmospheric pressure(Absolute Pressure) down to sea level elevation. When you do that calculation now you can compare Relative Pressures from station to station.

To do that calculation you have to calculate your fixed offset as gyvate described and add it to your ABS and then compare that result to your airport's METAR SLP reading. How you adjust ABS and/or REL to align with your METAR's SLP depends on the brand of weather station. An image of your calibration screen would be useful.

I know, I'm not dumb. Here are multiple problems, for example, if my weather station measures my location absolute pressure how the hell is calculating my relative pressure without knowing my altitude ?

Offline galfert

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Re: Sainlogic 310 Barometric pressure settings
« Reply #18 on: June 14, 2021, 08:18:59 PM »
I know, I'm not dumb. Here are multiple problems, for example, if my weather station measures my location absolute pressure how the hell is calculating my relative pressure without knowing my altitude ?

As the pressure changes hour to hour, day to day, the difference between your Absolute and your Relative pressure will be constant. This difference is basically equal or indicative of your elevation. When you dial in this difference you are basically telling the station what your elevation is.

Difference between Relative and Absolute pressure = Elevation
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Offline galfert

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Re: Sainlogic 310 Barometric pressure settings
« Reply #19 on: June 14, 2021, 08:27:37 PM »
For what it is worth the Sainlogic 310 is not a Fine Offset clone.
« Last Edit: June 15, 2021, 04:25:02 AM by galfert »
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Offline Gyvate

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Re: Sainlogic 310 Barometric pressure settings
« Reply #20 on: June 15, 2021, 02:59:50 AM »
For what it is worth the Sainlogic 310 is not an Fine Offset clone.
[tup] found that out meanwhile too - the WS-0310 is not very well documented in the net though.
Didn't find any manual. But, first glance impressions can be deceptive ... - confused it with a WS3500.

After some longer digging I was able to have a closer look at the device: the console design is different and the look of the sensor array is very different.
Obviously not a FO product line.

Still, that a station in this price league should not allow to enter a relative pressure calibration beyond +/- 10 hPa looks very strange to me.
For absolute pressure calibration that may make sense.
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Offline galfert

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Re: Calibrating pressure using a lower airfield METAR
« Reply #21 on: June 15, 2021, 04:44:49 AM »
To seek better peer support on this forum, it is recommended to post in the appropriate subforum for your hardware. This seems to be a hardware related issue because no other 3rd party software is being used.

I have moved and merged two threads to the "Other Weather Station Hardware" subforum because the Sainlogic 310 is not any of the listed and typically discussed types. It happens to be a Uctech product. It is not a Fine Offset clone.

Sainlogic sells weather stations from several OEM companies. This may confuse the novice that may think that either Sainlogic makes their own stuff or that all Sainlogic hardware are similar. The truth is that depending on model the Sainlogic station will be completely different and incompatible with product lines from this same seller. After all Sainlogic is nothing but  a reseller of various brands. Sainlogic does sell other models that are Fine Offset clones. All this means is that depending on what you have strongly changes how to use your station.
« Last Edit: June 15, 2021, 07:32:46 PM by galfert »
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Offline Jim_S

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Re: Sainlogic 310 Barometric pressure settings
« Reply #22 on: June 15, 2021, 02:09:14 PM »
Hello,
I started to calibrate my weather station by comparing the nearest airfield, 700 meters, METAR relative pressure with my console relative display pressure; found a 4.8 hPa difference (higher on the airport). Now, I reduced this difference from my console pressure relative pressure and have 2 question forward:
1. Do I move on and reduce more from my relative pressure console because of the altitude location of my weather station ?
2. My airfield is 13 meters bellow my altitude, how to manage this one further ?


If you only live 700 meters from the airport your relative pressure should exactly match the relative pressure reported by the Metar. If it doesn't, you need to adjust your station's reading until it does. Don't worry about the difference in elevation.

I found these instructions online explaining how to do that (hopefully they are correct):

To calibrate the barometer on the ws-0310:  press and hold the "set & alarm" buttons for 5 seconds...that brings you to the calibration mode.  then quick press the set button to get to the relative pressure box.....press plus or minus to  change the numbers then press alarm to save it.


Make sure you use the most recent relative pressure reading, ideally one that's only a few minutes old on a day when the barometer is, "steady" not rising or falling rapidly.

Offline leonardus68

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Re: Sainlogic 310 Barometric pressure settings
« Reply #23 on: June 16, 2021, 04:30:07 AM »
Hello,
I started to calibrate my weather station by comparing the nearest airfield, 700 meters, METAR relative pressure with my console relative display pressure; found a 4.8 hPa difference (higher on the airport). Now, I reduced this difference from my console pressure relative pressure and have 2 question forward:
1. Do I move on and reduce more from my relative pressure console because of the altitude location of my weather station ?
2. My airfield is 13 meters bellow my altitude, how to manage this one further ?

Thank you for help.
If you only live 700 meters from the airport your relative pressure should exactly match the relative pressure reported by the Metar. If it doesn't, you need to adjust your station's reading until it does. Don't worry about the difference in elevation.

I found these instructions online explaining how to do that (hopefully they are correct):

To calibrate the barometer on the ws-0310:  press and hold the "set & alarm" buttons for 5 seconds...that brings you to the calibration mode.  then quick press the set button to get to the relative pressure box.....press plus or minus to  change the numbers then press alarm to save it.


Make sure you use the most recent relative pressure reading, ideally one that's only a few minutes old on a day when the barometer is, "steady" not rising or falling rapidly.

 

anything