Owner's manual

<6 BASIC OPERATION> 6-16
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
6.4 Stream Switching & Valve Control Outputs
TheTDLS220hasthreevalvedrivers(24VDCeach@12Wmaxeach)terminatedat
TB-3.Thesecanbeusedforeithercalibration/Validationand/orstreamswitching
functions.IfusingthesevalvedriversforanytypeofCalibration/Validationfunction
then please refer to the appropriate section of Instruction Manual. As shown in the fol-
lowingdrawing,3processstreamsareconnectedto3gasvalvesthentotheinletof
theTDLS220owcell.Thegasvalvesarecontrolledbythree24Vrelayoutputsignals
from the launch unit of the analyzer. During normal operation, only one valve can be
openatatime.TheconnectedsolenoidwiresatTB-3mayrequiretheinstallationofa
ferritecoiltoeliminatenoisespikes–thisistotallydependantonthesitespecicelec-
trical grounding conditions. If the analyzer appears to be re-booting when one or more
of the solenoids is activated then this means some noise protection is required. Either
addaferritecoiltotheconnectingwires(contactYokogawaforfurtherassistanceif
necessary)oradda3A50Vdirectionaldiodeacrossthe+/-terminalsatTB-3.
Valve 1
Valve 2
Valve 3
Stream 1
Stream 2
Stream 3
Inlet
Outlet
TDLS220 Sample Flow Cell
24V relay control signals
from Control Unit

Figure15-ValveControl
Figure15-TypicalStreamSwitchingScheme