Brooks® QUANTIM® Low Flow Coriolis Precision Mass Flow ...

Section 4 MaintenanceQmB Series IP40, IP65, IP65XPInstallation and Operation ManualX-CM-QmB-engPart Number: 541B029AHGJune, 2008Table 4-1 Troubleshooting (continued)Observation Cause Resolutioncontrol you can replace ordisassemble and clean the valve.(See Section 4-3)Particulates in the flow stream.Agglomeration of fluid at orifice.Chemical deposits.Use an inlet filter.Consider a larger orifice (valvestability could suffer).Institute regular PM back flushing.Poor filtration of process fluid.Valve out of adjustment(applicable to Controller).Install proper filtration.Contact Brooks Instrument.Valve out of adjustment Valve guide spring failure Contact Brooks Instrument.(applicable to Controller).Valve override input is groundedDefective electronic boardCheck the valve override input(Pin12).Contact Brooks Instrument.Output signal follows Setpoint Control valve leaks or is stuck Exercise the control valveat higher Setpoints but will not open. alternating between valve overridego below 2%"open" and closed. If problempersists backflush the device witha solvent or purge gas with valveoverride "open".Output signal stays in approx. Valve leaks or is stuck open Backflush the device with5.5 Vdc or 22 mA (applicable to Controller). a solvent or purge gas with valve(regardless of setpoint) andoverride "open".there is flow trough themeter/controller+15 Vdc applied to the valve Check the valve override terminaloverrride input (Pin 12).(applicable to Controller).Defective PC board.Contact Brooks Instrument.4-4