As of how fast such a sensor can react, I tested today a DS18B20 dropping into
a cup
of just boiled water. Temperature got from room temp. to stable 90C in 10
seconds:
:
23 16:19:40
23 16:19:42
23 16:19:43
47 16:19:46
69 16:19:47
80 16:19:48
83 16:19:50
86 16:19:51
88 16:19:52
89 16:19:53
90 16:19:55
90 16:19:56
90 16:19:57
:
DS28B20's head was half covered with a heat shrinkable tube, to protect it's
pins.
I have attached an .xls with logged data and graphs
I have used them in a laboratory a/c monitoring and i have experienced ripples
when a/c starts
'correcting' room temperature.
at http://ikaros.dmst.aueb.gr/logs/labs.html, you can see for ELOI2 the ripples
(click the 'last24h' image)
A/C is at the ceiling (about 4m high), sensor is near the wall,
behind an office, under the A/C, half a meter above flour.
In the same room, there is a rack, and i have placed a sensor at it's internal
side, placed near the top server.
Notice again the ripples at http://ikaros.dmst.aueb.gr/logs/racks.html.
ELOI3's rack is in a 4mx3m room.
>> I was thinking of trying to use some DS18S20 sensors to monitor the
>> temperature above the various fire effects. The sensors would be
>> mounted to the ceiling above the various fire sources. The DS18S20
>> looks to have a range that'll support our needs, -55°C to +125°C.
>> Since the sprinklers trigger at around +82°C that should work fine.
>> But I'm concerned about being able to monitor temperature changes fast
>> enough to provide accurate monitoring. The two aspects of that are how
>> fast / often can I realistically expect to read the temperatures on a
>> string of 5 to 7 sensors and how fast do the sensors themselves react
>> to changes in temperature.
Peter Kropf wrote on 13/1/2007 20:17:
I'm hoping to use the DS18S20's since I've got a bunch of them here in
my studio. I'll need to play around with them this morning to see how
they react to temperature changes...
- Peter
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org:Athens University of Economics and Business;Department of Management Science & Technology
adr:;;76, Patission Ave.;Athens;Attica;;Greece
email;internet:gzoug(at)aueb(dot) gr
title:Technical Administrator
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