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Thread: E61 OPV Pressure Setting

  1. #1
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    E61 OPV Pressure Setting

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi All,

    Would like some expert opinion or input from your experience.

    What is the recommended OPV reading or setup for E61 grouphead machines with a double boiler & rotary pump configuration ?

    Should it be 8,9 or 10 at maximum on the pressure gauge during extraction?

    I also did read somewhere that pressure at e.g. 10 bar at the gauge translates to approx 9 bar at the OPV - grouphead ?

    Is that right?

    Thanks for your reply,
    Cheers

  2. #2
    Senior Member sprezzatura's Avatar
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    E61 OPV Pressure Setting

    Well, 9 bar is standard but we run espresso at different pressures for different roasts and grind particle size.

    Your machine (if it's a lever actuator) can pre-infuse the puck and then deliver water at full pressure (9 bar) or lower pressure, say, 6.5 bar (if you choose to set the OPV/bypass that loose).

    Gauges, unless newer, can be unreliable; best measure pressure with a portafiltre gauge at the group head.
    Dimal likes this.

  3. #3
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    Quote Originally Posted by sprezzatura View Post
    Well, 9 bar is standard but we run espresso at different pressures for different roasts and grind particle size.

    Your machine (if it's a lever actuator) can pre-infuse the puck and then deliver water at full pressure (9 bar) or lower pressure, say, 6.5 bar (if you choose to set the OPV/bypass that loose).

    Gauges, unless newer, can be unreliable; best measure pressure with a portafiltre gauge at the group head.
    how do you ensure a portafilter gauge (unless its SCACE) is more accurate than the built in gauge . I mean they are usually of the similar quality.

  4. #4
    Senior Member sprezzatura's Avatar
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    Quote Originally Posted by symphonie View Post
    how do you ensure a portafilter gauge (unless its SCACE) is more accurate than the built in gauge . I mean they are usually of the similar quality.
    I replace my p/f gauges every 2-3 months as running espresso tainted water and fines with its associated oils damages the gauge at the group head - so does the hot water. I have three different gauges including a German oil-filled precision gauge. Some machines have better quality gauges than others. I'm using a 20 bar oil filled gauge at the moment and it's very accurate.
    Dimal likes this.



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