Comments on: Types of temperature sensors for the home http://www.homesignals.com/sensors/temperature-sensor-types-for-the-home.html Building an intelligent home Sat, 30 Jan 2010 16:08:06 -0500 http://wordpress.org/?v=2.8.5 hourly 1 By: Kelly http://www.homesignals.com/sensors/temperature-sensor-types-for-the-home.html/comment-page-1#comment-16 Kelly Wed, 31 Dec 2008 19:49:07 +0000 http://homesignals.com/?p=11#comment-16 I didn't know about the capacitance issue, I guess I should read a little more, thanks. I didn’t know about the capacitance issue, I guess I should read a little more, thanks.

]]> By: Toby http://www.homesignals.com/sensors/temperature-sensor-types-for-the-home.html/comment-page-1#comment-10 Toby Wed, 17 Dec 2008 23:26:48 +0000 http://homesignals.com/?p=11#comment-10 That could be the load capacitance issue mentioned on page 6 of the LM34 datasheet. EIC uses the LM34CAZ in their EI-1034 probe, and in their datasheet they mention a max cable length of 25 feet before you need to add a decoupling resistor: http://www.labjack.com/files/ei1034.pdf I am not sure if they did measurements or calculations to come up with that 25 feet figure. That could be the load capacitance issue mentioned on page 6 of the LM34 datasheet. EIC uses the LM34CAZ in their EI-1034 probe, and in their datasheet they mention a max cable length of 25 feet before you need to add a decoupling resistor:

http://www.labjack.com/files/ei1034.pdf

I am not sure if they did measurements or calculations to come up with that 25 feet figure.

]]> By: Kelly http://www.homesignals.com/sensors/temperature-sensor-types-for-the-home.html/comment-page-1#comment-9 Kelly Wed, 17 Dec 2008 02:43:26 +0000 http://homesignals.com/?p=11#comment-9 Yes, that's a good point. I've built several circuits for the LM34s. The first had a remote transducer with the signal conditioning about 30 feet away and led to all sorts of noise. After that, I made sure the conditioning circuit was within a foot of the LM34 which eliminated the noise. Yes, that’s a good point. I’ve built several circuits for the LM34s. The first had a remote transducer with the signal conditioning about 30 feet away and led to all sorts of noise. After that, I made sure the conditioning circuit was within a foot of the LM34 which eliminated the noise.

]]> By: Toby http://www.homesignals.com/sensors/temperature-sensor-types-for-the-home.html/comment-page-1#comment-4 Toby Tue, 16 Dec 2008 18:04:56 +0000 http://homesignals.com/?p=11#comment-4 One key detail is that the IC type sensor directly outputs voltage (very convenient), while the RTD and thermistor provide a varying resistance. One key detail is that the IC type sensor directly outputs voltage (very convenient), while the RTD and thermistor provide a varying resistance.

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