Humidity Sensor


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Humidity Sensor

Postby PolyhymnianMuse » Nov 14th, '08, 22:57

I'm looking for a pretty nice gadget to measure the humidity of the area where I'm going to store my pu. It would be nice to get something that will keep track of the level over time so I can see lows, highs, spikes, anything like that. I know a lot of you guys use them so gimmie some suggestions :)
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Postby taitea » Nov 14th, '08, 23:22

I've asked about this before in a different thread, can't find it right now though.

Basically, I've owned 3 hygrometers so far, each under $10. I suspected them all to be off by about 10%, sometimes more, so watch out for that. I don't know why they're always off like that I'm guessing because they are cheap. Salsero posted this link on calibrating them.

I think even if they're off they can be used to give you an idea of what rooms/storage techniques affect your RH in what ways.
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Postby Warden Andy » Nov 14th, '08, 23:47

Try checking the reptile section of a pet store. If you can find a digital hygrometer by fluker's, I would recommend getting that one. Out of the few I've tried, that one was the most accurate.

If you can't find that one, cigar shops should carry several digital hygrometers, just some might require calibration. Also, I think those are mostly only calibrated for the range between 65-75%rh. Outside that range, it could have an accuracy of +/-10.
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Postby tenuki » Nov 15th, '08, 01:45

• Temperature, Temperature/RH/Dew Point, Voltage and Current Models
• Datalogger Plugs Directly into Computer ’s USB Port for Easy Setup and Data Download (No USB Cable Required)
• User-Programmable Alarm Thresholds with LED Indicators
• Bright Red,Green and Orange LED Indication
• Low Battery Warning
• IP67 Protection

Image

OM-EL-USB-2

TEMPERATURE AND RELATIVE HUMIDITY DATA LOGGER
(DEW POINT INDICATION VIA WINDOWS SOFTWARE)
TEMPERATURE
Range: -35 to 80°C (-31 to 176°F)
Resolution: 0.5°C(1°F)
Accuracy: ±1.0°C (±2.0°F)
HUMIDITY
Range: 0 to 100% RH
Resolution: 0.5% RH
Accuracy: 20 to 80% RH ±3.5% RH
DEW POINT
Accuracy (overall error in the calculated dew point for RH measurements from 40 to 100% RH @ 25°C): ±2°C (±4°F)

GENERAL
Memory: 16,000 temperature and 16,000 relative humidity readings
Logging Interval: 10 seconds to 12 hours
Operating Temperature Range: -35 to 80°C (-31 to 176°F)
Alarm Thresholds: High/low alarm thresholds for % RH and temperature, selectable in software
Start Date/Time: Selectable in software
Status Indicators (LEDs): Red and green
Software: Windows 98/2000/XP/VISTA
Power: 12 AA 3.6 V lithium battery (included)
Battery Life: 1 year typical (depends on sample rate, ambient temperaure and use of alarm LEDs)
Weight: 57 g (2 oz)
Dimensions: See dimensional drawing
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Postby wyardley » Nov 15th, '08, 02:00

taitea wrote:I've asked about this before in a different thread, can't find it right now though.


viewtopic.php?t=6341


The Honeywell one mentioned keeps a min and max (can be reset), but you'd want something that will transmit to a computer if you want to actually graph it.
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Postby PolyhymnianMuse » Nov 15th, '08, 13:34

Tenuki that one sounds perfect. Do you know where I might be able to find one of those? It seems with that one you don't get a real time read out and have to plug it into the computer before you see whats going on in said area. Is that correct?
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Postby tenuki » Nov 15th, '08, 16:44

PolyhymnianMuse wrote:Tenuki that one sounds perfect. Do you know where I might be able to find one of those? It seems with that one you don't get a real time read out and have to plug it into the computer before you see whats going on in said area. Is that correct?


correct. I have a wall mount one like everyone else is talking about for the realtime display. The battery lasts a bit over two years on the OM-EL-USB-2 I have, it's replaceable. The picture in my first post should be clickable to where you can order it.

Dickson has a bunch of models with displays like these, but they cost significantly more .

Image

Image


Onset's HOBO line is also interesting (but expensive). There is a WiFi version that almost has a high enough cool/dollar ratio.

Image
Last edited by tenuki on Nov 15th, '08, 18:23, edited 1 time in total.
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Postby PolyhymnianMuse » Nov 15th, '08, 18:08

Ohh ok I see now. I could probably just log the information on my computer every week or so and than see where I can go based on it. I see there is one (OM-EL-USB-2-LCD) that has an LCD display for $15 more but it seems to be out of stock right now.
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Postby tenuki » Nov 15th, '08, 18:45

PolyhymnianMuse wrote:Ohh ok I see now. I could probably just log the information on my computer every week or so and than see where I can go based on it. I see there is one (OM-EL-USB-2-LCD) that has an LCD display for $15 more but it seems to be out of stock right now.


Cool, that was not available when I got mine.
Last edited by tenuki on Nov 15th, '08, 18:51, edited 1 time in total.
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Postby PolyhymnianMuse » Nov 15th, '08, 18:47

tenuki wrote:
PolyhymnianMuse wrote:Ohh ok I see now. I could probably just log the information on my computer every week or so and than see where I can go based on it. I see there is one (OM-EL-USB-2-LCD) that has an LCD display for $15 more but it seems to be out of stock right now.


Cool, that was not available when I got mine.


Yea I emailed them to see if I can get any information on it. It looks like its a brand new item cause all thats on the website about it is that it will be there in 6 weeks.
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