Bronkhorst MASS-VIEW Series Manuel d'utilisateur télécharger pdf (Page 8)



BRONKHORSTHIGH‐TECH

 



Page8 MASS‐VIEW®series 9.17.051

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



∆P 

k



T∅











 120°1



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.



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.



4‐waybutton



1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

Pas de commentaire

Bronkhorst MASS-VIEW Series Manuel d'utilisateur Page 8