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Thread: Want Gas Pressure Sensor

  1. #1
    Frequent Visitor bigjim's Avatar
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    Oct 2014
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    Carpentersville, Il
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    Want Gas Pressure Sensor

    Like many others I have a CA reactor that relies upon a CO2 tank to work. I use a PH probe to control the CO2 and monitor my CA reactor. What would be really nice would be a pressure sensor that could be attached between the tank valve and regulator that could be programmed in Apex to send notifications when the pressure in the tank drops below a specified level. This would give us time to replace a tank that is about to go empty before the tank is empty. The last time my CO2 tank went empty was on a Saturday afternoon. By then the local supplier where I get my CO2 from was closed for the weekend. The meant I had to wait to Monday afternoon to get a fresh tank of CO2 to run my reactor. Being able to monitor the amount of gas in the tank would be especially helpful when going out of town for a week's vacation.

  2. #2
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    canada
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    Ya that.would be awesome

    Sent from my SM-G930W8 using Tapatalk

  3. #3
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    Illinois -6 Time Zone
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    I don't run CA reactor but you could probably 1. get a pneumatic pressure switch and use a BOB circuit that will open or close circuit to have Apex alarm and text you. 2. Get a small spare tank as backup

  4. #4
    Apex User zombie's Avatar
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    Dec 2013
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    Denver, CO
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    That is a really big expense for something that can fairly easily be done with programming alone.

    Two alarms can tell you if there is something wrong with the flow and if the tank is getting low but not out by using the following process.


    1. Set your logging interval to 1 min temporarily so you can better log your reactor solenoid.

    2. After 1 week has past record the lengths of time your solenoid was on and the times your solenoid was off. This must 've with clear flow and a tank at least half full.

    3. Determine the min, max, and average times the solenoid was on and off.


    Then you need to make a couple virtual outlets based on the numbers you gathered.


    For a flow alarm take the average ON time, multiply by the larger of 2 times the average or 1.1 times the max. I am assuming this number is 30 minutes in the example below and CaRx is the name of your solenoid outlet.

    CaRxFlowAl (virtual outlet)
    Set OFF
    If Outlet CaRx = ON Then ON
    Defer 030:00 Then ON


    For a low tank alarm take the average OFF time, multiply by the larger of 1.5 times the average or 1.1 times the max. I am assuming this number is 40 minutes in the example below and CaRx is the name of your solenoid outlet.

    Co2Low (virtual outlet)
    Set OFF
    If Outlet CaRx = OFF Then ON
    Defer 040:00 Then ON



    You might be an engineer if...You have no life and can prove it mathematically.

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