Riken Keiki RI-215A User manual
Air Quality Monitor
RI-215A
Instruction Manual
PT3E‐0064
RI-215A Operator’s Manual2 • Warranty
Warranty
RIKENKEIKI.,warrantsgasalarmequipmentsoldbyustobefreefromdefectsin
materialsandworkmanship,andperformanceforaperiodofoneyearfromdateof
shipmentfromRIKENKEIKI.Anypartsfounddefectivewithinthatperiodwillbe
repairedorreplaced,atouroption,freeofcharge.Thiswarrantydoesnotapplytothose
itemswhichbytheirnaturearesubjecttodeteriorationorconsumptioninnormalservice,
andwhichmustbecleaned,repaired,orreplacedonaroutinebasis.Examplesofsuch
itemsare:
AbsorbentcartridgesBatteries
PumpdiaphragmsandvalvesFilterelements
Fuses
Warrantyisvoidedbyabuseincludingmechanicaldamage,alteration,roughhandling,or
repairsproceduresnotinaccordancewiththeinstructionmanual.Thiswarrantyindicates
thefullextentofourliability,andwearenotresponsibleforremovalorreplacementcosts,
localrepaircosts,transportationcosts,orcontingentexpensesincurredwithoutourprior
approval.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES
AND REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER OBLIGATIONS
OR LIABILITIES ON THE PART OF RIKEN KEIKI., INCLUDING BUT NOT
LIMITED
TO THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR
PURPOSE. IN NO EVENT SHALL RIKEN KEIKI., BE LIABLE
FOR INDIRECT,
INCIDENTAL, OR CONSEQUENTIAL LOSS OR DAMAGE OF ANY KIND
CONNECTED
WITH THE USE OF ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO
FUNCTION
OR OPERATE PROPERLY.
Thiswarrantycoversinstrumentsandpartssoldtousersonlybyauthorizeddistributors,
dealers,andrepresentativesasappointedbyRIKENKEIKI.
Wedonotassumeindemni
fi
cationforanyaccidentordamagecausedbytheoperationof
thisgasmonitorandourwarrantyislimitedtoreplacementofpartsorourcomplete
goods.
RI-215A Operator’s Manual Table of Contents • 3
Table of Contents
Chapter 1: Introduction................................................................................................... 5
Overview ............................................................................................................................................. 5
About the RI-215A............................................................................................................................ 5
Measuring Mode ................................................................................................................. 5
Maintenance Mode.............................................................................................................. 5
Alarm Adjust Mode.............................................................................................................. 5
Specifi cations .................................................................................................................................. 6
About this Manual ............................................................................................................................... 6
Chapter 2: Description .................................................................................................. 7
Overview ............................................................................................................................................. 7
External Description ......................................................................................................................... 7
Case.................................................................................................................................... 7
Cable Assembly..................................................................................................................... 8
Internal Description .......................................................................................................................... 8
Printed Circuit Board........................................................................................................... 8
LCD ..................................................................................................................................... 9
IR Gas Sensor..................................................................................................................... 9
Fuse .................................................................................................................................... 9
Chapter 3: Installation................................................................................................. 10
Overview ........................................................................................................................................... 10
Mounting the RI-215A .................................................................................................................... 10
Wiring the RI-215A......................................................................................................................... 12
Notes on Wiring the RI-215A ............................................................................................ 12
Connecting the Power ...............................................................................................................13
Connecting the RI-215A to a Recorder............................................................................. 13
Connecting the RI-215A to a Controller............................................................................ 14
Connecting the RI-215A to an External Alarm Device....................................................... 14
Start Up .......................................................................................................................................... 14
Introducing Power to the RI-215A ..................................................................................... 14
Warm Up ........................................................................................................................... 14
Preparing to Set the Zero.................................................................................................. 15
Setting the Zero Reading .................................................................................................. 15
Chapter 4: Operation................................................................................................... 16
Overview ........................................................................................................................................... 16
Measuring Mode ............................................................................................................................ 16
Alarm Indications .............................................................................................................. 16
Responding to Alarms....................................................................................................... 16
Analog Output ................................................................................................................... 17
Alarm Point and Ventilation Control................................................................................... 17
Alarm Adjust Mode......................................................................................................................... 18
RI-215A Operator’s Manual4 • Table of Contents
Verifying the Alarm Point........................................................................................................18
Adjusting the Alarm Point.......................................................................................................18
Chapter 5: Maintenance .............................................................................................. 20
Overview ........................................................................................................................................... 20
Preventive Maintenance................................................................................................................. 20
Daily .................................................................................................................................. 20
Quarterly ........................................................................................................................... 20
Troubleshooting.............................................................................................................................. 20
Replacing Components.................................................................................................................. 21
Replacing the Sensor........................................................................................................ 21
Replacing the Fuse ........................................................................................................... 21
Calibration ......................................................................................................................................... 22
Preparing for Calibration ..................................................................................................... 22
Setting the Zero Reading .................................................................................................. 22
Setting the Response Reading ......................................................................................... 22
Returning to Normal Operation ........................................................................................... 23
Parts List ........................................................................................................................................ 23
Appendix A: Changing the Detection Range ............................................................ 24
RI-215A Operator’s Manual Overview • 5
Chapter 1: Introduction
Overview
Thischapterbrie
fl
ydescribestheRI‐215A.ThischapteralsodescribestheRI‐215A
Operator’sManual(thisdocument).Table1attheendofthischapterliststhespeci
fi
cations
fortheRI‐215A.
About the RI-215A
TheRI‐215AAirQualityMonitordetectsthepresenceofCO2(carbondioxide)usingan
infrared(IR)gassensor.TheRI‐215AshowsincreasinglevelsofCO2onitsliquidcrystal
display(LCD).ItalsodisplaysavisualalarmshouldlevelsofCO2exceedtheunit’sfull
scale(e.g.,2,000ppm).AlarmcontactsontheRI‐215Aarealsoprovided,whichenable
youtoconnectanexternalalarmtotheunit.
ThreerangesofgasdetectionareavailablefortheRI‐215A:0‐2,000ppm,0‐5,000ppm,
and0‐9990ppm.Detectionrangesaresetatthefactory.WhenyouorderedtheRI‐215A,
youshouldhavespeci
fi
edoneofthesegasdetectionrangesforyourunit.Itbecomes
necessarytochangethedetectionrange,See“AppendixA:ChangingtheDetection
Range”onpage24.
TheRI‐215Aoperatesinthreemodes:MeasuringMode,MaintenanceMode,andAlarm
AdjustMode.
Measuring Mode
MeasuringModeisthemodeinwhichtheRI‐215Adetects,measures,anddisplaysCO2
(normaloperation).
Maintenance Mode
MaintenanceModeallowsyoutoperformmaintenancetasks.Thesetasksinclude:
•adjustingthezerosetting
•adjustingthespansetting
•changingthedetectionrange
CAUTION: TheRI‐215AisnotinoperateasagasmonitorwhenyouareinMaintenanceMode.
Alarm Adjust Mode
AlarmAdjustModeallowsyoutoverifyandchangethealarmpoint.
RI-215A Operator’s Manual6 • Specifications
Specifications
Table1listsspeci
fi
cationsfortheRI‐215A.
Table 1: Specifications
PowerSource24VACor24VDC
TargetGasCO2(carbondioxide)
SamplingMethodDiffusion
AreaClassi
fi
cationIndoor,nonhazardouslocations
SignalOutput4to20mA
Accuracy±5%offullscale
Fuse10.5A,125V(5mmx20mm)
1A0.5A,250Vfuseisanacceptablereplacement.
About this Manual
TheRI‐215AOperator’sManualusesthefollowingconventionsfornotes,cautions,and
warnings.
NOTE:Describesadditionalorcriticalinformation.
CAUTION: Describespotentialdamagetoequipment.
WARNING: Describespotentialdangerthatcanresultininjuryordeath.
MethodofconfirmationforCEmarkingtype
TheCEmarkingislabeledonthedetectorincaseofcomplywithCEmarking.Please
confirmtheinstrumentspecificationbeforeusing.PleasereferDeclarationofConformity
thatisattheendofthismanualifyouhaveCEmarkingtype.
YoucanconfirminstrumentspecificationtoseetheCEmarkingasfollows.
CEmarkinglabel(Backsideofinstrument)
CEmarking
RI-215A Operator’s Manual Overview • 7
Chapter 2: Description
Overview
ThissectiondescribestheexternalandinternalcomponentsoftheRI‐215A.
External Description
Case
TheRI‐215A’ssteelcaseisradiofrequency(RF)‐resistant.Itissuitableforinstallationin
indoorareaswheregeneralpurposeequipmentisinuse.
Thecasehasafronthousingandabaseplate,whichsnaptogether.Thefronthousinghas
aLCDwindow,whichisshowninthefrontviewofFigure1.
LCD Display Window
Front View Mode Switch
Up/Alarm Switch
Down Switch
Set/Calibration Switch
Back View
Cal Gas Inlet Rubber Cover
Bottom View
Figure 1: Component Location of the RI-215A
Cable Connector
Entry Slot
RI-215A Operator’s Manual8 • Internal Description
Onthebottomofthefronthousingisaseriesofslotsandacalibrationport.Theslots
allowthetargetgassampletoentertheIRgassensorintheRI‐215A.Thecalibrationport
iscoveredwitharubbercap.Thecalibrationportaccepts1/
4‐inchID(insidediameter)
fl
exibletubing.Aseriesofswitchesareaccessibletotherightofthecalibrationport,as
showninFigure1onpage7.Theseswitchesinclude:
•Mode(M)
•Up/Alarm()
•Down()
•Set/Calibration(S)
Thebaseplatehasawireentryslotforthecableassembly.Thecableassemblyconnects
directlytotheprintedcircuitboardinsidethecasethroughthecableentryslot.Thecable
assemblyisusedtoconnecttoanexternalpowersource.Youalsouseittomake
connectionstoanexternalalarmandtoamonitoringorrecordingdevice.Thebaseplate
hastwomountingholesforconvenientmountingonverticalsurfacesatthemonitoring
site.
Cable Assembly
Thecableassemblyconnectstoasix‐pinreceptacleontheprintedcircuitboardthrougha
slotontherearofthecase.ItallowsyoutomakeexternalwiringconnectionstotheRI‐
215A.
Internal Description
Printed Circuit Board
OntheprintedcircuitboardislocatedtheIRgassensor,LCD,andfuse.Connectedtothe
printedcircuitboardisthecableassembly.
TheprintedcircuitboardconvertstheoutputoftheIRgassensortoa4‐to‐20mAsignal
(thatisproportionaltothedetectionrangeoftheRI‐215A).Theprintedcircuitboardalso
displaysadigitalreadingontheLCD.
Theprintedcircuitboardhasfourswitches:Mode(M),Up/Alarm(,Down(),and
Set/Calibration(S).Theseswitchesarelocatedatthebottomoftheprintedcircuitboard
beneaththegassensor.Table2listseachswitchanditsfunction.
Table 2: Model RI-215A Program Switches
Switch Function
Mode (M) Enters Maintenance Mode
Up/Alarm()• Increases the setting on the LCD
• Displays the alarm point
Down () • Decreases the setting on the LCD
Set/Calibration (S) • Prepares a setting to be changed
• Enters a new setting
RI-215A Operator’s Manual Internal Description • 9
LCD
The LCD is mounted to the printed circuit board. The LCD shows the current gas reading
of the RI-215A’s target gas. The LCD also shows operational messages when the RI-215A
exceeds its full scale.
IR Gas Detector
The IR detector uses infrared light and an infrared sensor to detect CO2. A small infrared
light source is located in the detector. As CO2 enters the detector, it absorbs infrared light
in a characteristic way as the concentration increases. The infrared sensor detects this
change in infrared light and the unit converts this to a gas concentration.
Fuse
One extractor-type fuse protects the AC line circuitry from short circuit or overload. The
fuse is rated at 0. 5A, 125 V. See “Parts List” on page 23.
RI-215A Operator’s Manual10 • Overview
Chapter 3: Installation
Overview
ThischapterdescribeshowtoinstalltheRI‐215Aatthemonitoringsite.Thissectionalso
includesprocedurestomakepowerandotherwiringconnectionstotheRI‐215A.
Mounting the RI-215A
CAUTION: TheRI‐215Aissuitableforinstallationinindoorareaswheregeneralpurpose
equipmentisinuse.
1. Selectamountingsitethatisrepresentativeofthemonitoringenvironment.Consider
thefollowingwhenyouselectthemountingsite:
•SelectasitenearthesamplingareainwhichtheRI‐215Aisnotlikelytobe
bumpedordisturbed.
•Choosealocationnotsubjecttosigni
fi
cantairmovement,forexample,nearanair
conditioningorheatingvent.
•MounttheRI‐215Ainanareanotsubjecttolargetemperatureandhumidity
changes.
•MounttheRI‐215Aonthewallatleastsixfeetfromthe
fl
oortominimizethe
possibilityofsomeonebreathingontheunit.TheexhaledCO2maycausean
alarm.
•Makesurethereissuf
fi
cientroomtomakewiringconnectionsthroughtheback
oftheunit,andtoremovetheunitfromthebaseplatetoperformmaintenance,
suchasreplacingthefuse.
2. Forwall‐mounting,removethebaseplateoftheRI‐215A.
•Usingasmallscrewdriver,pressdownonthesmalltabontopofthe
ModelRI‐215A.
•Whilepushingdownonthetab,gentlymovethebaseplateawayfromthefront
housingoftheRI‐215A.
CAUTION: BeverycarefulnottopullonthecableassemblyconnectedtotheRI‐215A’sinternal
printedcircuitboardwhenremovingthebaseplate.Pullingonthecableassembly
maydamagetheprintedcircuitboard.
•Completelyseparatethebaseplatefromthefronthousing.
RI-215A Operator’s Manual Mounting the RI-215
A
• 11
3. Usetwoscrewstosecurethebaseplatetothewall.Figure2belowshowsthelocation
ofthescrewholesinthebaseplate.
3.08
3.08
Front View
Right Side View
2.37
.25
.17 Diameter
Mounting Hole Location
Back Side
Figure 2: RI-215A Outline and Mounting Dimensions
4. ReassemblethebaseplateandthefronthousingoftheRI‐215Ainthereverseorderas
describedinstep2above.Lineupthebottomofthebaseplatewiththefronthousing,
thencarefullysnapthebaseplateandfronthousingtogether.
1.23
RI-215A Operator’s Manual12 • Wiring the RI-215A
Wiring the RI-215A
This section describes procedures to connect power to the RI-215A. This section also
describes optional procedures to connect a controller or recorder and external alarm
device to the RI-215A.
WARNING: Toreducetheriskofelectricshock,alwaysverifythatpowertotheRI‐
215AhasbeenturnedoffbeforemakinganywiringconnectionstotheRI‐
215A.MakesuretooperatetheRI‐215Afromthespeci
fi
edpowervoltageof
24VAC/VDC,andfollowthelocalelectriccodewhenmakingallelectrical
connections.
Notes on Wiring the RI-215A
•Useastable24VACor24VDCpowersource.Donotuseanoisypowersource.Ifthe
powersourceisnoisy,usealine
fi
ltertoeliminatethenoise.
•Useshieldedcablefortheoutputsignallineincaseswherenoiseisapotential
problem.
•ThealarmrelaycontactsintheRI‐215Aareratedat0.5A,125VAC.Donotusethese
contactstocontrolanelectricalloadlargerthanthisrating.Forlargeloadcontrol,use
theRI‐215Aalarmcontactstocontrolaslaverelaywithanappropriatecontactrating.
Figure3belowshowsthegeneralwiringdiagramoftheRI‐215A,andisnotspeci
fi
cto
anydevicetowhichtheunitcouldbeconnected.Theredwiresofthecableassembly,as
showninFigure3below,connecttoanexternal24VACor24VDCpowersupply.The
whitewiresserveasarelaycontactandcanbeusedtocontrolanexternalalarm.The
yellowandbluewirescarrya4‐20mAoutputsignal.Thesewirescanbeconnectedtoa
gasmonitoringcontrollerorarecordingdevice.
RI-215A
1
(red)
2
(red)
3
(white)
4
(white)
5
(yellow)
4 - 20 mA Standard, 0 - 10V Optional
6 (blue)
Normally Open
Relay Contact
Figure 3: General Wiring Diagram of the RI-215A
24 VAC or 24 VDC
Power
+
Recording Device
RI-215A Operator’s Manual Wiring the RI-215
A
• 13
Figure 4 below shows how to wire the RI-215A to a controller that accepts 3-wire, 4-20 mA
transmitters.
Figure 4: Wiring Diagram of the RI-215A as a 3-Wire 4-20 mA Transmitter
Connecting Power
1. VerifythatpowertotheRI‐215AhasbeenturnedOFF.
2. ConnectthetworedAClinecablestothe24VACor24VDCpowersource.Referto
thewiringdiagraminFigure3onpage12.
3. Ifyoudonotplantomakeanymorewiringconnections,thenterminatethe
remainingcablesappropriatelytoavoidanelectricalshort.
Connecting the RI-215A to a Recorder
PerformthefollowingproceduretoconnecttheRI‐215Atoarecorder.Theoutputofthe
RI‐215Aisa4‐to‐20mAsignal,whichisproportionaltothedetectionrange.
NOTE:ThestandardoutputoftheRI‐215Ais4‐20mA.Anoptionaloutputof0‐10Vis
availableandmustbespeci
fi
edatthetimeofyourorder.
1. VerifythatpowertotheRI‐215AhasbeenturnedOFF.
2. Connecttheyellow(+)andblue(‐)wirestothecontrollerorrecordingdevice.Referto
thewiringdiagraminFigure3.
3. Ifyoudonotplantomakeanymorewiringconnections,thenterminatethe
remainingwires.
3 (white)
4
(
white
)
5 (yellow)
RI-215A
Controlle
r
Terminals
1
(
red
)
+ 24 VDC
2
(
red
)
- (DC Ground)
4 - 20 mA In (S or FB)
Normally Open
Relay Contact
6
(
blue
)
Not Used
RI-215A Operator’s Manual14 • Start Up
Connecting the RI-215A to a Controller
PerformthefollowingproceduretoconnecttheRI‐215Aasa3‐wire4‐20mAtransmitter
toacontroller.
1. VerifythatpowertotheRI‐215AhasbeenturnedOFF.
2. ConnectoneoftheredwiresfromtheRI‐215Atothe+24Vtransmitterterminalatthe
controller.
3. Connecttheotherredwiretothe‐(DCground)transmitterterminalatthecontroller.
4. ConnecttheyellowwiretotheSorFBtransmitterterminalatthecontroller.
Connecting the RI-215A to an External Alarm Device
CAUTION:Themaximumcurrentratingofthenormally‐open,drycontactsis0.5amp.Ifthe
alarmdeviceexceedsthisrating,usethealarmcontactstocontrolarelaywithan
appropriatecurrentrating.
1. VerifythatpowertotheRI‐215AhasbeenturnedOFF.
2. Connectthewhitewirestotheexternalalarm.Refertothewiringdiagramin
Figure3onpage12.
3. Ifyoudonotconnectthewhitewirestoanalarmdevice,terminatetheseunused
wires.
Start Up
ThissectiondescribesprocedurestostartuptheRI‐215AandplacetheRI‐215Ainto
normaloperation.
Introducing Power to the RI-215A
•Completeallinstallationproceduresdescribedearlierinthischapter.
•VerifythatthewiringsupplyingpowertotheRI‐215Ahasbeenconnectedcorrectly.
•Turnonorplugintheincomingpoweratthepowersource.
•VerifythattheRI‐215AshowsareadoutonitsLCDasdescribedinthenext
subsection.
Warm Up
AfteryouhaveturnedonthepowertotheRI‐215A,theunittakesaboutoneminuteto
beginoperating.Duringthisinitialwarm‐upperiod,“CO2”isshownontheunit’sLCD.
Aftertheinitialwarmupiscompleted,thegassensorinsidetheRI‐215Adetectsthe
presenceofCO2,anddisplaystheconcentrationsofthisgasonitsLCD.Simultaneously,
theRI‐215Aalsooutputsa4‐to‐20mAsignal(0to10Voptional)whichcorrespondstothe
gasconcentration.
CAUTION: AllowtheRI‐215Atowarmupforanadditional30minutesbeforecontinuing.
RI-215A Operator’s Manual Start Up • 15
Preparing to Set the Zero
Connectthesampletubingfromyourcalibrationkittothehosebarbonthe
fi
xed
fl
ow
regulator.The
fi
xed
fl
owregulatorshouldbea0.5LPMregulator.
NOTE:Donotconnecttheregulatortothecalibrationcylinderatthistime.
Setting the Zero Reading
1. Locatethefunctionswitchesonthebottomoftheunit.
2. PressandholdtheMODEswitch(M)forthreesecondstoenterMaintenanceMode.
Thedisplaywillshow“1”toindicateZeroAdjustmentMode.
3. PresstheSETswitch(S)toenterZeroAdjustmentMode.Thedisplaywillshowa
readingwitha
fl
ashingdecimalpointbeforethe
fi
rstandthirddigits,forexample
“.1.5“.
4. Removetherubbercapcoveringthecalibrationgasinletportatthebottomofthe
unit.
5. InsertthecalibrationtubingintothegasinletopeningatthebottomoftheRI‐215A
andpushthetubingoverthecalibration
fi
tting.
6. Screwa100%nitrogencalibrationcylinder(aCO2‐freesource)intotheregulator.
7. Allowthegasto
fl
owforoneminuteoruntilthegasreadingstabilizes.
8. PresstheSETswitch(S)andtheunitwilladjustthereadingtozero.Becarefulnotto
breathontotheRI‐215AsincetheCO2inyourbreathmayaffectthereading.
9. PresstheSETswitch(S)andthedisplaywillagainshowa“1”.
10. Unscrewtheregulatorfromthenitrogencylinder.
11. Toreturntonormaloperation,presstheMODEswitchforthreesecondstoexit
MaintenanceMode.
RI-215A Operator’s Manual16 • Overview
Chapter 4: Operation
Overview
ThischapterdescribesMeasuringModeandAlarmAdjustMode.UnderMeasuring
Mode,alarmindicationsarediscussedalongwithrespondingtoalarms,analogoutput,
andalarmpointandventilationcontrol.UnderAlarmAdjustMode,verifyingthealarm
pointandadjustingthealarmpointaredescribed.
Measuring Mode
WhentheRI‐215AisinMeasuringMode(normaloperation),itdisplaysthecurrent
concentrationofCO2onitsLCDandoutputsa4‐20mAsignalthatcorrespondstothe
CO2concentration.ThetypicalbackgroundCO2levelis200‐400ppm.
Alarm Indications
IftheCO2concentrationrisesabovethealarmpoint,therelaycontactwillactuate.Ifthe
gasconcentrationexceedsthefullscale,theLCDshows:
Responding to Alarms
1. FollowyourestablishedprocedureforhandlinghighlevelsofCO2gas.
2. Whenthedisplayreadingfallsbelowthealarmpoint,thealarmcircuitautomatically
resetsitself.
RI-215A Operator’s Manual Measuring Mode • 17
Analog Output
TheRI‐215A’sanalogoutput,availableviatheyellowandbluewiresofthecable
assembly(refertoFigure3onpage12),isproportionaltotheconcentrationofCO2forall
gasranges(e.g.,0‐2,000ppm,0‐5,000ppm,and0‐9990ppm),asshowninFigure4.
Maximum
Output
22mA(11V)
20mA(10V)
Output
signal
4mA(0V)
0ppmGas
Concentration
2000ppm
5000ppm
9990ppm
Figure 5: Model RI-215A’s CO2 Level to Output Signal
ShouldtheconcentrationofCO2presentinthemonitoringenvironmentbeabovefull
scale(i.e.,itexceedstheuppergasrangeofyourunit),thehighestoutputwillbe22mA,
or11V,dependingontheoutput,current,orvoltage,selectedatthefactory.TheLCDof
theRI‐215Awillshowaseriesofbrackets(upsidedown“Us”)between20mA
(10V)and22mA(11V).ThestandardoutputsettingfortheRI‐215Ais4‐20mA.
Alarm Point and Ventilation Control
TheRI‐215A’salarmrelayhasabuilt‐inhysteresisof50ppm(refertoFigure6on
page18).Afterthealarmpointhasbeenreached(e.g.,1000ppm),thealarmrelaywill
activate.AstheCO2concentrationbeginstofall,thealarmrelaywilldeactivate50ppm
belowtheactivationpoint(e.g.,950ppm).The50ppmhysteresiskeepsthealarmcontacts
from“chattering”shouldtheCO2concentrationhoveraroundthealarmpoint.
RI-215A Operator’s Manual18 • Alarm Adjust Mode
Soifthealarmrelaycontactsarewiredtoturnonaventilationsystemwhenthe
concentrationofCO2reachesthealarmpoint(e.g.,1000ppm),theventilationsystemwill
remainonuntiltheconcentrationofCO2fallsto50ppmbelowthealarmpoint(e.g.,950).
1000ppm
950ppm
CO2
Hysteresis
50ppm
Closed
Relaycontact
Open
Open
Figure 6: Model RI-215A’s Built-in Hysteresis of 50 ppm
Alarm Adjust Mode
UsetheUp()switchtoenterAlarmAdjustMode.
Verifying the Alarm Point
ThreerangesofgasdetectionareavailablefortheRI‐215A:0‐2,000ppm,0‐5,000ppm,
and0‐9990ppm.Detectionrangesaresetatthefactory.WhenyouorderedtheRI‐215A,
youshouldhavespeci
fi
edoneofthesegasdetectionrangesforyourunit.
ThealarmpointoftheRI‐215Aisalsosetatthefactory(e.g.,1000ppm).Todisplaythe
currentalarmpointfromthenormalLCD,dothefollowing:
1. PressandholdtheUp()switch.Thealarmpointappears(e.g.,10:00)ontheLCD
(alarmveri
fi
cationscreen).Inthisexample,10:00indicatesanalarmpointof1000
ppm.Notethatthecolon(:)willbe
fl
ashing.
2. ReleasetheUp()switchtoreturntothenormalLCD.Donotholdthe()switchfor
morethanthreesecondsortheunitwilldisplaytheAlarmAdjustscreen.
FurthernotethattheRI‐215A’salarmrelayhasabuilt‐inhysteresis(lag)of50ppm.After
thealarmpointhasbeenreached(e.g.,1000ppm),thealarmrelaywillactivate.Asthe
CO2concentrationbeginstofall,thealarmrelaywilldeactivate50ppmbelowthe
activationpoint(e.g.,950ppm).The50ppmhysteresiskeepsthealarmcontactsfrom
“chattering”shouldtheCO2concentrationhoveraroundthealarmpoint.
RI-215A Operator’s Manual Alarm Adjust Mode • 19
Adjusting the Alarm Point
Toadjustthealarmpoint,dothefollowing:
1. PressandholdtheUp()switchforthreesecondstodisplaytheAlarmAdjust
screen.TheLCDwill
fl
ashthealarmpointsettingandthecolon(:)alternately.
2. UsetheUp()andDown()switchestoadjustthealarmpointtothesettingyou
want(e.g.,11:00=1100ppm,12:00=1200ppm,12:30=1230ppm,13:00=1300ppm,
etc.)
3. PresstheSETswitchtosavethenewalarmpoint.Theunitreturnstonormal
operationandtheLCDdisplaysthecurrentgasreading.
RI-215A Operator’s Manual20 • Overview
Chapter 5: Maintenance
Overview
ThischapterdescribesmaintenanceandtroubleshootingproceduresfortheRI‐215A.It
includesinstructionsforthereplacementoftheRI‐215A’sgassensorandfuseand
calibrationprocedures.Asparepartslistislocatedattheendofthischapter.
Preventive Maintenance
This section describes a preventive maintenance schedule.
Daily
VerifyadisplayreadingforCO2inppm.Investigatesigni
fi
cantchangesinthereading.
TypicalbackgroundlevelsofCO2are200to400ppm,dependingonlocation.
Quarterly
Calibratetheunit.See“Calibration”onpage22.
Troubleshooting
The troubleshooting table describes error messages, symptoms, probable causes, and
recommended action for problems you may encounter with the RI-215A.
Table 3: Troubleshooting the RI-215A
Symptoms Probable Causes Recommended Action
• The LCD does not show
a gas reading or is blank.
• Power may have been
terminated to the unit.
• The unit may have
been incorrectly
connected to a power
source.
• The wrong power
source is being used to
run the unit.
• The fuse may have
blown.
• The unit may be in
Maintenance Mode.
1. Verify that the power source has been
turned on and is working.
2. If a circuit breaker has been used in the
installation of the RI-215A, make sure
that the circuit breaker has not been
activated.
3. Verify that the wiring to the power source
has been connected correctly.
4. Make sure you have used the correct
power source: 24 VAC or 24 VDC.
5. Open the unit and check the fuse.
Replace the fuse if required. The RI-215A
takes the following replacement fuse: 0.
5A, 125 VAC (5.2 mm x 20 mm).
6. The unit may be in Maintenance Mode.
Press the MODE switch for three
seconds, or until a gas reading appears.
7. If difficulties continue, contact RIKEN
KEIKI.
Table of contents
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