Bronkhorst®
Instruction Manual mini CORI-FLOW ML120
9.17.097G
59
Problem
Possible cause
Action
Leakage
Check system for leaks
New setpoint on limit
> 0%
Set
New setpoint on limit
to 0% (see
Flow signal too slow
Output filters enabled
Disable filters (see
·
Delivered batch size inaccurate
and/or unstable
·
Delivered batch size does not
match counter limit
Vibrations in instrument
surroundings
·
Avoid mounting in close proximity of
mechanical vibrations
·
Follow
Zero point drifted
Adjust zero point (see
Gas inclusion in liquid
Install degasser
Inlet pressure unstable
Eliminate pressure fluctuations, e.g. by
installing a pressure regulator
Filter settings not optimized
Disable filters (see
Proportional dosing too fast
Decrease counter control gain (see
)*
Controller settings not optimized
Set overrun correction to 0.8 (see
Flow signal > 130%
Inlet pressure too high
Decrease inlet pressure
Liquid tubing resistance too low
Restrict flow e.g. with needle valve or by using
tubing with smaller diameter
Full scale capacity too low
Rescale controllable flow range (see
)*
Controller settings not optimized
Decrease PID-Kp value (see
)*
*) Proportional control only