Author Topic: Apogee Instruments  (Read 504 times)

0 Members and 1 Guest are viewing this topic.

Offline benay ra'am

  • Senior Member
  • **
  • Posts: 87
Apogee Instruments
« on: September 02, 2017, 08:27:54 AM »
What do you think of this Aspiration Shield? Kind of pricey at $445-$495

https://www.apogeeinstruments.com/aspirated-radiation-shield/

https://www.youtube.com/watch?v=G9xdVQii_YY




CoCoRaHS: NC-JH-80

Offline Bushman

  • Forecaster
  • *****
  • Posts: 6582
    • Eagle Bay Weather
Re: Apogee Instruments
« Reply #1 on: September 02, 2017, 12:52:17 PM »
Expensive.   What is interesting to me is the use of thermistor as the temp sensor to go -50C to 70C

Offline Old Tele man

  • Singing in the rain...
  • Forecaster
  • *****
  • Posts: 991
Re: Apogee Instruments
« Reply #2 on: September 02, 2017, 02:48:09 PM »
This statement yields some useful FARS information:

"Rugged, Low Power Fan

The fan has an ingress protection (IP) rating of 55, virtually eliminating moisture and dust ingress. At full speed the power requirement is 1 W (80 mA at 12 V DC). To conserve power fan speed can be reduced, via pulse width modulation (PWM), to 0.3 W at night or when wind speed is greater than 3 m s-1 without loss of accuracy. If the fan is continuously operated at full speed lifetime is rated at 50,000 hours (5.7 years). The fan includes a tachometer, allowing RPM to be mounted to detect obstruction of the fan."
SYS: Davis VP2/WL-IP & Envoy8X/WL-USB
CWOP: DW6988 - 2 miles NNE of Cortaro, AZ
WU - KAZTUCSO202, Countryside

Offline ValentineWeather

  • Forecaster
  • *****
  • Posts: 3986
Re: Apogee Instruments
« Reply #3 on: September 02, 2017, 04:41:14 PM »
I looked at them couple years ago. I think the price has went up substantially from then. Unless I can get a sht31 inside wouldn't work for my station.
Here are the shield adapter hole sizes pdf. https://www.apogeeinstruments.com/content/ts100sensorportadapter.pdf
Randy, the Aviator is my father in 1963 with his Indian bike

Offline Bashy

  • Forecaster
  • *****
  • Posts: 765
    • Suffolk Weather
Re: Apogee Instruments
« Reply #4 on: September 03, 2017, 12:57:48 AM »
Its what i based my OS shield on, there is a fan at the top and bottom of the main housing
Kind regards
Bashy

Offline Bashy

  • Forecaster
  • *****
  • Posts: 765
    • Suffolk Weather
Re: Apogee Instruments
« Reply #5 on: September 03, 2017, 01:00:40 AM »
This statement yields some useful FARS information:

"Rugged, Low Power Fan

The fan has an ingress protection (IP) rating of 55, virtually eliminating moisture and dust ingress. At full speed the power requirement is 1 W (80 mA at 12 V DC). To conserve power fan speed can be reduced, via pulse width modulation (PWM), to 0.3 W at night or when wind speed is greater than 3 m s-1 without loss of accuracy. If the fan is continuously operated at full speed lifetime is rated at 50,000 hours (5.7 years). The fan includes a tachometer, allowing RPM to be mounted to detect obstruction of the fan."


I wonder how the shield knows the wind speed???




Kind regards
Bashy

Offline CW2274

  • Forecaster
  • *****
  • Posts: 2982
    • Conditions @ CW2274
Re: Apogee Instruments
« Reply #6 on: September 03, 2017, 02:06:09 AM »
Its what i based my OS shield on, there is a fan at the top and bottom of the main housing
The bottom?
Davis Wireless VP2 SHT31 24hr 67CFM FARS
RW Tipper w/ CoCoRaHS

Offline Bashy

  • Forecaster
  • *****
  • Posts: 765
    • Suffolk Weather
Re: Apogee Instruments
« Reply #7 on: September 03, 2017, 02:12:45 AM »
Yes, adding a second (bottom) fan brought the temp down 1C
Kind regards
Bashy

Offline CW2274

  • Forecaster
  • *****
  • Posts: 2982
    • Conditions @ CW2274
Re: Apogee Instruments
« Reply #8 on: September 03, 2017, 02:37:56 AM »
Yes, adding a second (bottom) fan brought the temp down 1C
I have no idea what fan you're using, but whatever it is, every bit of heat generated by it is going past the sensor, lower temp or not. Certainly could be negligible, but personally, I'd get a bigger fan and only use it at the top making it a non-issue.
Davis Wireless VP2 SHT31 24hr 67CFM FARS
RW Tipper w/ CoCoRaHS

Offline Bashy

  • Forecaster
  • *****
  • Posts: 765
    • Suffolk Weather
Re: Apogee Instruments
« Reply #9 on: September 03, 2017, 02:45:49 AM »
Im not worried about the fractional amount of heat generated, the suction far outweighs if any, heat generated
its pretty much on par with the davis until the afternoon then its about 1C higher than the davis, but, the davis
was also 1C higher than it should have been when it was sited in the same spot, hence having to mount the davis
on the mast. its not the ideal place to mount a temp sensor. PS, both fans are 4000rpm PC case fans. seriously
heat from the motor is negligible :)
Kind regards
Bashy

Offline CW2274

  • Forecaster
  • *****
  • Posts: 2982
    • Conditions @ CW2274
Re: Apogee Instruments
« Reply #10 on: September 03, 2017, 03:07:12 AM »
Okay, just food for thought, playing devil's advocate, all that stuff, BUT, if the bottom fan starts failing, your temps could slowly start to artificially rise, unbeknownst to you, due to bearing failure, and eventually add to global warming. Hows that for pressure?
Davis Wireless VP2 SHT31 24hr 67CFM FARS
RW Tipper w/ CoCoRaHS

Offline Bashy

  • Forecaster
  • *****
  • Posts: 765
    • Suffolk Weather
Re: Apogee Instruments
« Reply #11 on: September 03, 2017, 03:17:49 AM »
That's sommat I would ha e to live with for the rest of my life, but cope me thinks lol 😂
I check it nearly everyday, I also have to clean the intake screen fairly regular, although not so much in the winter, it's not like it's that far away that I hardly go near it, I have to go past it to empty the manual gauge.
Kind regards
Bashy

Offline Old Tele man

  • Singing in the rain...
  • Forecaster
  • *****
  • Posts: 991
Re: Apogee Instruments
« Reply #12 on: September 03, 2017, 01:39:55 PM »
This statement yields some useful FARS information:

"Rugged, Low Power Fan

The fan has an ingress protection (IP) rating of 55, virtually eliminating moisture and dust ingress. At full speed the power requirement is 1 W (80 mA at 12 V DC). To conserve power fan speed can be reduced, via pulse width modulation (PWM), to 0.3 W at night or when wind speed is greater than 3 m s-1 without loss of accuracy. If the fan is continuously operated at full speed lifetime is rated at 50,000 hours (5.7 years). The fan includes a tachometer, allowing RPM to be mounted to detect obstruction of the fan."


I wonder how the shield knows the wind speed???
Probably "talked to" from the Anemometer. Hence, the need for fan with tach output (feedback) and speed control. Kinda/sorta makes sense, too. Basically, a "smart" daylight FARS. I just wonder how "universal" that threshold '3 meters/second' truly is for varied locations?
« Last Edit: September 03, 2017, 01:44:01 PM by Old Tele man »
SYS: Davis VP2/WL-IP & Envoy8X/WL-USB
CWOP: DW6988 - 2 miles NNE of Cortaro, AZ
WU - KAZTUCSO202, Countryside

Offline Bashy

  • Forecaster
  • *****
  • Posts: 765
    • Suffolk Weather
Re: Apogee Instruments
« Reply #13 on: September 03, 2017, 01:42:37 PM »
True and what I was thinking too, but then I also thought, what if it was a temp only station.....
Kind regards
Bashy

Offline Old Tele man

  • Singing in the rain...
  • Forecaster
  • *****
  • Posts: 991
Re: Apogee Instruments
« Reply #14 on: September 03, 2017, 01:48:56 PM »
True and what I was thinking too, but then I also thought, what if it was a temp only station.....
Just a SWAG on my part:  Assuming the same technique as automobile ECU's use: two temp-sensing beads (one in airflow; one in stagnate) and measuring their delta-temp numbers...whereby, as airflow increases, more heat is drawn away from the exposed bead than the stagnated bead.
SYS: Davis VP2/WL-IP & Envoy8X/WL-USB
CWOP: DW6988 - 2 miles NNE of Cortaro, AZ
WU - KAZTUCSO202, Countryside

Offline Bashy

  • Forecaster
  • *****
  • Posts: 765
    • Suffolk Weather
Re: Apogee Instruments
« Reply #15 on: September 03, 2017, 01:52:53 PM »
That's quite flashy:)
Kind regards
Bashy

Offline benay ra'am

  • Senior Member
  • **
  • Posts: 87
Re: Apogee Instruments
« Reply #16 on: September 03, 2017, 08:32:06 PM »
Did anyone noticed that the inner tube was a Venturi?




CoCoRaHS: NC-JH-80

Offline CW2274

  • Forecaster
  • *****
  • Posts: 2982
    • Conditions @ CW2274
Re: Apogee Instruments
« Reply #17 on: September 03, 2017, 08:45:42 PM »
Did anyone noticed that the inner tube was a Venturi?
Indeed. That means compressed air, which is heated, is going by the sensor. Oh jeez, what have you started?  #-o
Davis Wireless VP2 SHT31 24hr 67CFM FARS
RW Tipper w/ CoCoRaHS

Offline benay ra'am

  • Senior Member
  • **
  • Posts: 87
Re: Apogee Instruments
« Reply #18 on: September 03, 2017, 09:12:47 PM »
Did anyone noticed that the inner tube was a Venturi?
Indeed. That means compressed air, which is heated, is going by the sensor. Oh jeez, what have you started?  #-o

Actually, the temp probe is in the constriction, = Higher velocity= a slightly lower pressure= a slightly lower temp




CoCoRaHS: NC-JH-80

Offline CW2274

  • Forecaster
  • *****
  • Posts: 2982
    • Conditions @ CW2274
Re: Apogee Instruments
« Reply #19 on: September 03, 2017, 09:42:46 PM »
Did anyone noticed that the inner tube was a Venturi?
Indeed. That means compressed air, which is heated, is going by the sensor. Oh jeez, what have you started?  #-o

Actually, the temp probe is in the constriction, = Higher velocity= a slightly lower pressure= a slightly lower temp
I was being "tongue in cheek", but after a little research, it would seem that you're correct. Thanks for the education! 8-)
Davis Wireless VP2 SHT31 24hr 67CFM FARS
RW Tipper w/ CoCoRaHS

Offline Bashy

  • Forecaster
  • *****
  • Posts: 765
    • Suffolk Weather
Re: Apogee Instruments
« Reply #20 on: September 04, 2017, 12:11:45 AM »
I like it, at 15:50 he admits the metspec shield is better and the metspec shield is not fan aspirated, they are also double louvered and mat black on the underside and i think are used by the UKMO
Kind regards
Bashy