Project Help - a bioreactor and two pinch valves.

Discussion in 'The Projects Forum' started by Zooz, Nov 26, 2015.

  1. Zooz

    Thread Starter New Member

    Nov 24, 2015
    7
    0
    Hello,
    I need to add a circulation line to a bioreactor and control the line with two pinch valves. The valves I will use are the following: http://www.coleparmer.com/Product/T...ve_12_VDC_1_16_ID_x_1_8_OD_tubing/EW-98302-42
    Controlling the valves will be through a computer. I will need to use data acquisition and LabView. I will need to use a TTL switch to make the valves TTL. The valve should open when the digital out pin is set high (5V) and close when the digital output pin is set low (0V). I need help with choosing the right switch that can operate with the valves. I hope you guys can help me with this..
     
  2. Picbuster

    Member

    Dec 2, 2013
    374
    50
    a: place a diode over the solenoid.
    b: use a Nmosfet able to run 30V
    c: place a resistor 47K between gate and source. ( source to gnd)
    d: connect resistor 1K between TTL output and gate.
    e: connect drain to anode of diode
    f: Power - to gnd +12V to kathode of diode.
     
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  3. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
    1,146
    204
    Zooz likes this.
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,800
    1,103
    Any MOSFETS used must be of the 'logic-level' type to ensure that 5V on the gate will switch them fully on.
     
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  5. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,770
    970
    how many posts are you going to start on the same subject?
    This is #3 now..
     
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