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Analog Input

Created by: Tobbe87 at: 7/1/2009 11:38 PM (5 Replies)

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7/1/2009 11:38 PM	Rate (0)
Tobbe87 Posts: 2 Rating: (0)	Hello I have a problem with a humidity sensor I don't know how to wire it to the logo 12/24RC and how to set it up in the logo program to show the right values. The sensor is a https://www1.elfa.se/data1/wwwroot/webroot/Z_DATA/07302665.pdf If anyone could help I would really appreciate i /Tobias
Tobbe87 Posts: 2 Rating: (0)
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7/2/2009 12:07 AM	Rate (2)
rosa Posts: 191 Rating: (58)	Hi!! it seems that your sensor is not ready for industrial use, it needs a temperature sensor and to be linealized.... i recommend you to use an industrial ready humidity sensor like this http://rocky.digikey.com/WebLib/Humirel/HM1500.pdf ROSA
rosa Posts: 191 Rating: (58)
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7/2/2009 9:11 AM	Rate (2)
LOGO!Barbarian Posts: 173 Rating: (95)	Hi 'hot & sweaty' humidity people! Problems with LOGO! and the first sensor type - LOGO! cannot supply a 1kHz excitation frequency - LOGO! cannot measure resistance (other than a Pt100) and so other electronics will be needed - the resistance senor resistance output is a combination of temperature and humidity and the corresponding values would have to be found on a 'look-up' table as in the spec sheet. LOGO! cannot store a look-up table - even if you put a known voltage across the sensor and measured the resulting output current on a LOGO! AM2 analog input module (0..20 mA), the range would not fit. - non-linear The sensor ROSA suggests (THanks) - has a linear voltage output between 1-4V (if supplied with 5V) - using a LOGO! Analog Amplifier for 0..10 V input, Gain = 3,81 and Offset = - 407 (Thanks Betel for your spreadsheet to work these out!) and 1 decimal place for the display, 10-95 %RH can be shown nicely! - you just have to take care of the values outside the range of interest (LOGO! internal analog values less than 133 and more than 355) - could probably do this with a comparator and a maths block (on 0BA6) Anyway, nicer solution than the first proposal! Thanks again ROSA - I will definitely archive this sensor type! Aaaarrghh! (Barbarian for "have an nice day!")
LOGO!Barbarian Posts: 173 Rating: (95)
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7/2/2009 10:25 AM	Rate (2)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 12/17/2024 Posts: 4518 Rating: (841)	Hello, Also you can use Siemens products. Use one of the followings Temp.-Humidity sensors QFM65: http://www.siemens.nl/sbt/doc/klt/N1861en.pdf or QFM66: http://www.siemens.nl/sbt/doc/klt/N1863en.pdf Regards,
	Ayman Elotaify
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7/2/2009 12:18 PM	Rate (2)
LOGO!Barbarian Posts: 173 Rating: (95)	Thanks! These look a lot easier to use (0-10 V linear signal) Only problem will be availability and price !!??! Also, the sensor originally asked about was just a small electronic component and not part of a complete measuring system, so maybe we need to look for a more readily available sensor that cna be interfaced easily to the LOGO!. This one is also for mounting in a duct for air-conditioning and is probably quite large - I think the original request was for something smaller. http://content.honeywell.com/sensing/prodinfo/humiditymoisture/009012_2.pdf This one looks similar to the original resistance type, but behaves like the one that ROSA suggested and therefore the Gain & Offset calc I did for that sample should work for this one! I think... problem solved ! Aaaarrgg!
LOGO!Barbarian Posts: 173 Rating: (95)
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This contribution was helpful to 1 thankful Users Tobbe87

7/2/2009 10:38 PM	Rate (0)
Tobbe87 Posts: 2 Rating: (0)	Thanks for all the fast answers I went with the suggestion from LOGO!Barbarian with the HIH-3610 but it's not manufactured any more so I took the newer model HIH-4000 instead. Hope it will work and thanks again for all the answers
Tobbe87 Posts: 2 Rating: (0)
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