Bronkhorst EL-FLOW Base 2014 - Manual (Page 32)

BRONKHORST HIGH-TECH
Symptom Possible cause Action
Small flow at zero setpoint Valve leaks due to damaged plunger or dirt in
orifice
6a) clean orifice and/or, when replacing
plunger assembly, see ‘1e’
Pressure too high or much too low 6b) apply correct pressure
High flow at zero setpoint Damaged diaphragm (only applicable to
valves with membrane)
7a) replace membrane seal
Page 32 EL-FLOW Base Series Mass Flow Controllers 9.17.061