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Use a LOGO for measure resistance

Created by: Schroten, Peter at: 8/25/2009 11:28 AM (3 Replies)

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8/25/2009 11:28 AM	Rate (0)
Schroten, Peter Posts: 2 Rating: (0)	Hello people, My college came to me and was wondering if a LOGO can measure the resistanse of water. Now a started to wonder if someone could answer that question for me. I searched an hour now but cant find it. Thanks, Peter
Schroten, Peter Posts: 2 Rating: (0)
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8/25/2009 12:23 PM

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Matti Niemi / Sol...

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Hi Peter,

This my board is measuring NTC resistors and any resistorsand gives the result as pulses, which is counted by Logo digital input.
Normal Logo input can count only 4 Hz speed. Fast input can count 5kHz speed.

Output of my board can be set by hardwareresistor and capacitor on board.
Calculation formula is
t1 = 0,693(R1+R2+R3)*C
t2 = 0,693 (R3*C)

R2 is external resistor (sensor). R1 and R3 are on board. Capacitor C is onboard.
t2 is fixed to 125ms (4Hz) and t1 is changing.

Speed can be set high, if you use fast input of Logo.
More info, contact matti.niemi@fi.abb.com

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UF-converter4.JPG (673 Downloads)

8/25/2009 1:14 PM	Rate (0)
Betel Posts: 1690 Rating: (584)	Hi Peter, first you must translate the resistance to pulses like Matti or to a voltage (with a R-bridge) or a (0)4..20 mA signal by hardware electronics and then you can measure a voltage 0 to 10 V or (0)4 to 20 ma with the LOGO ..... Best regards Betel
Betel Posts: 1690 Rating: (584)
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8/25/2009 2:02 PM	Rate (0)
Schroten, Peter Posts: 2 Rating: (0)	yes I get it, but how can I get the right number in the LOGO. I mean, I've got a voltage between 0 and 10 and a current btween 0 and 20 mAmps. How can I exchange that to Ohm. Thanks again, Peter
Schroten, Peter Posts: 2 Rating: (0)
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Use a LOGO for measure resistance

Created by: Schroten, Peter at: 8/25/2009 11:28 AM (3 Replies)

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Schroten, Peter

Matti Niemi / Sol...

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Use a LOGO for measure resistance

Created by: Schroten, Peter at: 8/25/2009 11:28 AM (3 Replies)

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4 Entries

Schroten, Peter

Matti Niemi / Sol...

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Betel

Schroten, Peter

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