Author Topic: Misol - Fine Offset oem. - Humidity sensor gone mad; any alternative replacement  (Read 2541 times)

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Offline bthoven

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I have an oem WS-1400-IP, 433Mhz weather station (outdoor sensors called WH24, and indoor sensors called WH25 + ObserverIP). The outdoor humidity sensor needs to be replaced because it reports fluctuating values ranging from 1-99%.

I used to open up the outdoor housing and don't think I have the ability to replace it. Is there any way to have a separate outdoor temp/hum sensor which can somehow replaces the humidity value transmitted from WH24, on the fly; so that my weewx server and WU upload get the replaced humidity value together with other sensors values.

For your information, I also got the Ecowitt GW1000 which can find my wh24. So basically, I can receive data from WH24 sensors with both the ObserverIP and GW1000.

Offline galfert

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Two ways to go about it.

  • Fix the WH24 which could have digital parts or analog parts. You have to take it apart to see which version you have.
    https://www.wxforum.net/index.php?topic=37806.0
  • Or you can try ordering a WH32E from Ecowitt. It will certainly work for the GW1000 but I'm not sure if the ObserverIP will see the WH32E.
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Offline bthoven

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Thanks.
If I add wh32e, will its values replace my outdoor sensors on the fly?

Offline galfert

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Thanks.
If I add wh32e, will its values replace my outdoor sensors on the fly?

On the GW1000 yes that is exactly what it does replace the WH24 (just temp/hum). No telling on the ObserverIP what will happen.
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Offline bthoven

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Thanks a lot for your confirmation. This could prolong my whole-set replacement.

Offline bthoven

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I can't find the ecowitt wh32e on their website, but found the wh32 instead. Do you think it works as we discussed? Ecowitt also sell the 433Mhz version.

http://www.ecowitt.com/wifi_weather/94.html

Thanks
« Last Edit: December 04, 2019, 11:26:47 PM by bthoven »

Offline galfert

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I believe it is the same thing. I would recommend also getting the RS-00001 shield for it. Ask Ecowitt and let us know.
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Offline bthoven

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Ecowitt confirmed me its reading values will override wh24s.

Thanks for suggesting the shield.

Offline bthoven

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Just got Ecowitt wh32 433Mhz outdoor sensor. It pairs with Ecowitt gw1000 and replaces the wh24 temp and humidity values, real time. Im happy with it because now Im free to place the outdoor temp/hum sensors at a more ideal place.

Using rtl_433 software to view the data transmitted from wh32, it reports as Fineoffset wh32B.
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« Last Edit: December 17, 2019, 04:26:25 AM by bthoven »

Offline galfert

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But what happened with the ObserverIP? Did it pick up the WH32 also?
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Offline bthoven

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But what happened with the ObserverIP? Did it pick up the WH32 also?
My ObserverIP is running Aercus firmware v.2.1.9 which allows me to redirect the traffic to my weewx server IP. It supports only:

indoor sensor 1 = WH25 or WH7
indoor sensor 2 = WH26 only
outdoor sensor = WH24

So I assume it wont see wh32. I offline it since I got gw1000.

Offline bthoven

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I found the temperature from WH32 is about 2 degree celcius higher than most of my neighbors'. So I use the calibration in GW1000 to compensate it. I'm not sure it is just my unit.

Offline Shvedi

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I found the temperature from WH32 is about 2 degree celcius higher than most of my neighbors'. So I use the calibration in GW1000 to compensate it. I'm not sure it is just my unit.
It is not just your unit.

Offline galfert

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I found the temperature from WH32 is about 2 degree celcius higher than most of my neighbors'. So I use the calibration in GW1000 to compensate it. I'm not sure it is just my unit.

What radiation shield are you using for the WH32?
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Offline bthoven

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What radiation shield are you using for the WH32?

No radiation shield. I hang it in an open-air deck with roof (5 meter high) where no sunshine reached. The sensor is half way between the roof and the deck ground.

Offline galfert

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What radiation shield are you using for the WH32?

No radiation shield. I hang it in an open-air deck with roof (5 meter high) where no sunshine reached. The sensor is half way between the roof and the deck ground.

Well that sounds like good best case without a radiation shield, but better results are to put it in a radiation shield out in the open above grass. Since there is a roof there is some greenhouse effect contributing to higher temperatures, and the ground structure and proximity to the building structure radiation due to thermal mass retention of energy.
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Offline bthoven

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Thanks for your suggestion. I notice that the temp difference is still there even at dawn.

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Offline galfert

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Radiant heat remains after sundown due to thermal mass stored energy.
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Offline fkapp

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Wouldn't temp with no shield typically start  out lower at dawn after cooling faster than sensor in a shield overnight because of faster at night radiational cooling ?

Offline galfert

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I think not. The the sensor without a shield would not necessarily cool faster. Because it would be more exposed to radiant thermal mass energy (heat) from the proximity of the building structure, foundation (floor) and because of the possible greenhouse effect of a roof. So in this case it is the location that is the critical issue, not an unshielded sensor.
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Offline Shvedi

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Radiant heat remains after sundown due to thermal mass stored energy.
My sensor keeps the 2 degrees Celsius gap even at 5 am, before sunrise - after 12 hours of darkness.

Offline galfert

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Radiant heat remains after sundown due to thermal mass stored energy.
My sensor keeps the 2 degrees Celsius gap even at 5 am, before sunrise - after 12 hours of darkness.

Where is the sensor located? 
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Offline Shvedi

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Radiant heat remains after sundown due to thermal mass stored energy.
My sensor keeps the 2 degrees Celsius gap even at 5 am, before sunrise - after 12 hours of darkness.

Where is the sensor located?

Very similar to bthoven... open air, under a high roof. No direct sunlight. Not exposed to rain.

Offline galfert

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Well I suppose a one time calibration is not out of order.

If you make a calibration offset of 2C and then it tracks perfectly at all times of the day through different weather then that is what is required. But if you put in an offset of 2C and then you notice that on nights and cool days that the temperature reading is 2C too low then perhaps better sensor siting and shield protection might be a better solution. But I will say that every location is different and you should not be comparing yourself to neighbors. Empirical testing requires that you use another verifiable thermometer at your location.
 
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