Bronkhorst MASS-VIEW Series Manuale Utente Scaricare il pdf (Pagina 8)

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BRONKHORSTHIGH‐TECH

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Page8 MASS‐VIEW®series 9.17.051

Thepressurelossacrosstheneedlecanbedescribedby:

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∆P 

k



T∅











 120°1

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The spring force in the upstream membrane valve closes the valve in the “zero” flow situation. By

openingtheneedlevalvetheΔPwillincrease,sofarthatthemembraneliftsupandcompensatesthe

springforce.Intheequilibriumpositiontheflowwillbeconstantevenwhentheupstream

pressure(P

)

changes.Howeverwhentheupstreampressureincreases,itwillcauseasmalleffectonthespringforce,

which means thattheΔP to open the membrane valve will be a littlesmaller. Thisresults in a lower

flow.

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Inpractisethedeviationoftheidealstraightlinewillbe

lessthan0,5‐1%perbar.

1.11 Electronics, display and 4-way button

The MASS‐VIEW

  has a bright graphical OLED display,

clearly visible over any angle, which allows reading of

actualflow(valueandbargraph),totalflowandgastype.

Thethree displayoptions can be changedusingthe4‐way

button This button is a navigation joystick which has

UP/DOWN/LEFT/RIGHT keys and a centre push (ENTER)

key.

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4‐waybutton

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Bronkhorst MASS-VIEW Series Manuale Utente Pagina 8