Owner's manual

FPGA
TTL out
Relay Coil
Drive Circuit
Relay Coil
Relay
Contacts
24VDC to
C and to NO
24VDC
TB3
DGND
24VDC 12W max to
external solenoid valve
when relay is energized
NOTE; Use ferrite coil or
direction diode on TB6
wired outputs to prevent
switching spikes
<4 ANALYZER COMPONENTS> 4-3
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
Calibration Valve Relays
Therearethreecalibrationvalverelaycircuitsontheboard.ThesearecapableofactuatingFormCSPDT
relays.Thecommonpoleisconnectedto24VDCpowerandthenormallyopenpoleisroutedtotheeld
terminalblock.DigitalgroundisalsoroutedtotheterminalblockTB3asshownbelow.
Figure3-CalibrationValveRelayDiagram
Connectionsofeachrelay(CommonandNormallyOpen)areroutedthroughtheboardtoeldterminals.
Thecontactsareratedforamaximumof1A@24VDC(or0.5A@125VAC).
Thepluggableeldterminalsaremountedontheloweredgeoftheboard,justtotheleftsideoftheDC
power input terminals.
Theappropriaterelay(s)isactuatedwhenacalibrationgascheckvalveistobeinitiated.
Laser Temperature & Current Control
The board has two main laser control function circuits, temperature control and laser current control.
Board Temperature
Theboardhasatemperaturesensingchip/circuitthatmonitorstemperatureoftheboardinsidethemain
electronicsenclosure.ThesensorislocatedonthetopedgeoftheBackPlane.
AnalogI/OBoardoutputstheanalyzerresultsandreadsinputprocessgascompensationvalues(pressure
andtemperature).TheboardhaspowerstatusLEDsaswellasvoltagetestpointsfortheinputandoutput
channels.
 •Outputchannels(three)areranged4-20mA.Theycanbeassignedtomeasuredvalues
 Oxgen,Transmissionorcompensationsignalre-transmission.
 •InputChannels(two)areusedbytheanalyzertoreadactivevaluesforprocessgas
 tempertureand/orprocessgaspressure.Theseareapplicationdependantandmayormay
not be required inputs. There are two channels, one for temperature and one for pressure.
 Eachmaybeusedtoread4-20mAsignalsthatareisolatedortoreadandlooppower(with
 integral24VDC)signals.
Optional Mini Display(4x20VFD)mountsontheanalyzerenclosuredoor.Thedisplayitselfisanindus-
trialgrade4line20charactervacuumuorescencedisplay(VFD)thatisselfilluminating(i.e.nobacklight
required).