OEL CTS-M20 User manual

CTS-M20
CARBONDIOXIDE
TRANSMITTER/SENSOR
INSTALLATION
OPERATIONANDMAINTENANCE
MANUAL
QUATROSENSEENVIRONMENTALLTD.
5935 OTTAWA STREE,POBOX 749 RICHMOND,ONTARIOCANADA KOA 2Z0
PHONE:[phone] FAX:[phone]
Web:www.QELsafety.com Email:[e-mail]

M-20 Operation AndMaintenanceManual
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Configuration:
(Usersettingsaresetto defaultsettings, unless otherwiseindicated below)
DefaultSetting UserSetting
J3 toLeftJ3 toRight
1Gas sensed Carbon Dioxide (CO2)
2Signal mode 2-10VLinear 4-20mA Linear
3Signal “CO2From” point 0ppm
4Signal “CO2To” point 2500 ppm
5Signal “SigFrom” at
“CO2From” point 2.0V 4.0mA
6Signal “SigTo” at
“CO2To” point 10.0V 20.0mA
7Output signal clipping Disabled
8Auto Zero No
9Altitude 300 feet
10 Password 0017
11 Relay Enabled
12 RelayOn1000ppm
13 RelayOff 950ppm
14 RelayOnDelay 0minutes
15 RelayOff Delay 0minutes
16 Global Average 360ppm
Specifications:
(Themanufacturerreservestheright to change theseatanytime)
Input Power(Nominal) 24 VACor24 VDC(Isolated)
Input PowerRange 18-40VACor18-40VDC
SensorType Non-DispersiveInfraRed (NDIR)
Thermo compensated aluminum block
EnclosureMaterials Polycarbonate/ABS blend,FireRetardant
Output Signal 0-20 mA,4-20mA,0-10Vor2-10 VorUserRange linear.
Temperature 5ºCto 40ºC
Humidity 0to 99%RH,non-condensing
Pressure Atmospheric±10%
SensorResponseTime Less than45 secondsfor90%of step change
Accuracy±2%of range
Repeatability ±10 ppm
Range Default0to 2500 ppm(4.0–20.0mA)
UserProgrammable0to 5000 ppm(0-10Vor0-20mA)
Display Alphanumeric2-lineX8-digitLCD
RelayOutput OneSinglePoleDoubleThrow(SPDT),FormC,1ampdrycontact
(CSA 1500 V,FCC Part68)
RelayTimeDelays Actuation –0to 60 minutesin5-minuteincrements.
De-actuation –0to 60 minutesin5-minuteincrements.
Mounting Screwmountsto astandard2” X4” electrical junction box.
Software Version 3.00 Revision A(orlater)

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Special Features Signal output optionsinclude negativeslope.
Signal end-points:adjustableppm,0-10V,0-20mA.
Adjustablerelaydead-band.
Relaycanactivatefordecreasingppm.
Simulation mode to simulateanyppmvaluefrom 0to 5000.
Auto Zeroto global average over8-dayperiod.
Passwordprotection forusersettings.

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TableofContents
1. INTRODUCTION......................................................................................4
1.1 Principleof Operation.............................................................................4
1.2 Display.................................................................................................5
1.3 Keypad.................................................................................................5
1.4 Output Signal........................................................................................5
1.5 SignalRange.........................................................................................5
1.6 Relay....................................................................................................7
1.7 Power...................................................................................................7
2. OPERATION............................................................................................8
3. FAULTINDICATION................................................................................8
4. CONFIGURATION....................................................................................9
4.1 User Interface.......................................................................................9
4.2 Menu Activation.....................................................................................9
4.3 Menu Item Selection............................................................................10
4.4 Menu Item Alteration...........................................................................10
4.5 Menu Tree...........................................................................................10
5. CALIBRATION.......................................................................................20
5.1 Equipment Required.............................................................................20
5.2 Gain Check..........................................................................................20
5.3 ZeroCalibration...................................................................................21
5.4 SpanCalibration..................................................................................21
6. TROUBLESHOOTING.............................................................................22
6.1 TroubleshootingTips............................................................................22
6.2 Fault Codes.........................................................................................24
7. DUCTMOUNT ADAPTER(CTS-M2000X-D00000)..................................25
8. WIRINGANDPOWERSUPPLY..............................................................26
WARRANTYSTATEMENT.............................................................................28
TableofFigures
Figure 1 -InternalViewandFeatures................................................................4
Figure 2 -SignalModeJumper (J3)....................................................................5
Figure 3 -DuctMount Configuration................................................................25
Figure 4 -DuctCutout....................................................................................25
Figure 5 -24VACFloatingSupply (4-Wire Installation)......................................26
Figure 6 -24 VACwith SeparateGrounds(4-Wire Installation)...........................26
Figure 7 -24VACwith CommonGrounds(3-Wire Installation)............................26
Figure 8 -24VDC Supply with CommonGround(3-Wire Installation)..................27
Figure 9 -24VDC Supply with SeparateGround(4-Wire Installation)..................27
Figure 10 -24VDC UngroundedSupply (4-Wire Installation)..............................27
Figure 11 -24VDC UngroundedSupply (3-Wire Installation)..............................27

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1. Introduction
Thismanualappliesto M-20 unitswith softwareVersion 3.01 andlater(released 2008-01-
03).Ifyou haveaproductwith softwareVersion 1.XX,pleasecontactthefactoryto obtaina
copyof thecorrectmanual.
1.1 PrincipleofOperation
TheM-20 isamicroprocessorcontrolled CO2Sensor/Transmitterusinginfrared sensing
technology.Theconcentration ofCO2ismeasured bydeterminingtheamount ofabsorption
of light inaspecificfrequencyband.
An analogsignaloutput isprovided,as well as arelaywith adjustablesetpoints. New
featuresforVersion 3.01 softwareare;extension ofthesignaloutput range downto 0V(or
0mA)andaSimulation Mode to assistintestingtheinstallation beforecommissioning.The
fieldcalibration featuresof theunitareextended as well.
Theunitoperatesfrom nominal24VACor24VDCandincorporatesanisolated switching
powersupply.
Figure1 -Internal View andFeatures

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1.2Display
Thedisplaymoduleisa2-lineby8-characterLCD.Thegas concentration displayformatin
measurement mode isas follows:
CO2ppm
XXXX
Wherexxxx isconcentration ofCO2,shownfrom -999 to 9999.Thedisplayed number
includesleadingzerosif below1000.Negativeconcentrationsindicatethattheunitrequires
calibration.Theconcentration isupdated every10 seconds.
NOTE: Thedisplayrange isnot thesameas theanalogoutput signalrange.Ifthe
signalrange issetto 2500 ppm,theconcentration will be displayed above
thesignalrange,eventhoughthesignalhas alreadystopped at20 mA or
10V.Theconcentration displayislinearupto 5000 ppm.Above5000ppm,
themeasurement becomesnon-linear.Thedisplayhas amaximum reading
of9999 ppm,inwhichcasetheactualconcentration maybe above
9999ppm.
1.3 Keypad
Thekeypadisasetofthree buttonsrecessed alongtheupperright side oftheenclosure.It
isnot necessaryto openthecoverforuse.Access to themenu systemispassword
protected.Press anykeyfor3secondsto enterthemenu system(see belowfordetails).
1.4 OutputSignal
Optionsfortheanalogoutput signalare:4-20 mA linear(default)or2-10Vlinear.Theoutput
mode canbe chosenmovingtheJ3jumper.Foroverrange concentrationsthesignalcan
exceed therange slightly(above20mA or10V)if clippingisdisabled (see belowfordetails).
Jumper3(J3)islocated inthetop-right handcornerof thecircuitcard.
1.5 Signal Range
Signalrange assignmentsallowtheuserto choosehowtheanalogoutput signaliscalculated
from thegas concentration.Thisallowsdirectoperation of louversandfanspeeds.
Thedefaultsettingsare0ppmCO2=4.0mA and2500 ppmCO2=20.0mA,with linearsignal
betweenthetwopoints. Thesesettingswill cover90%ormoreofapplicationsforindoorair
qualitycontrol.
Theusermayassignanygas concentration between0and5000 ppmto eachrange point in
stepsof50 ppm.Thelowerconcentration point iscalled the“CO2From”point andtheupper
concentration point iscalled the“CO2 To”point.Thesoftwarewill limittheminimum range
(differencebetweenthetwopoints)to 500ppm.
NOTE: The“CO2To” point cannot be setsmallerthanthe“CO2From” point.
Figure2 -Signal ModeJumper(J3)

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ThecorrespondingVoltage orCurrent pointscanbe adjusted between0Vand10V(for
voltage output mode)or0mA to 20mA (forcurrent output mode).
Thecurrent (orVoltage)pointscanbe setto anyrelation,meaningthe“SigFrom”point and
“SigTo”point canbe swapped to obtainanoutput responsewith anegativeslope.Fora
negativeslope theoutput Voltage (orcurrent)will decreaseas theconcentration increases.
NOTE: Alwayssetthe“JumperJ3”settingto matchJ3on theunit.It isadvisableto
maintainatleast4Vor(8mA)betweenthetwo“Sig”points. Thesoftware
doesnot performcheckingon thesesettings. Whileinthemenu system,or
beforethefirstmeasurement,thesignal issetto “SigFrom”.
When“Clipping”isenabled,thesignaloutput will not gobeyondeitherofthetwocurrent (or
Voltage)end-points. When“Clipping”isdisabled,thesignaloutput will goto 0Vor0mA
minimum to about 10.75V(21.5mA)maximum.
Signal OutputOptions
“JumperJ3”
Setting “Clipping” Setting Jumper J3 AnalogOutput SignalRange
“LeftVDC” “Disable” 0.0V – 10.75V
(default)
“LeftVDC” “Enable” “SigFrom”– “Sig
To”
in Volt
“RightMA” “Disable” 0.0mA – 21.5mA
“RightMA” “Enable” “SigFrom”– “Sig
To”
in mA
Signal SettingExamples
Example Settings Jumper
J3 AnalogOutput Signal Range
500-1500ppm
2.5V–8.5V
“JumperJ3” =“LeftVDC”
“CO2From” =“0500ppm”
“CO2To” =“1500ppm”
“SigFrom” =“02.50V”
“SigTo” =“08.50V”
“Clipping” =“Disable”
0.0V–10.75V
500-1500ppm
2.5V–8.5V
“JumperJ3” =“LeftVDC”
“CO2From” =“0500ppm”
“CO2To” =“1500ppm”
“SigFrom” =“02.50V”
“SigTo” =“08.50V”
“Clipping” =“Enable”
2.5V–8.5V
0-2500ppm
1.0V–5.0V
“JumperJ3” =“LeftVDC”
“CO2From” =“0000ppm”
“CO2To” =“2500ppm”
“SigFrom” =“01.00V”
“SigTo” =“05.00V”
“Clipping” =“Disable”
1.0V–10.0V

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Example Settings Jumper
J3 AnalogOutput Signal Range
0-2500ppm
1.0V–5.0V
“JumperJ3” =“LeftVDC”
“CO2From” =“0000ppm”
“CO2To” =“2500ppm”
“SigFrom” =“01.00V”
“SigTo” =“05.00V”
“Clipping” =“Enable”
1.0V–5.0V
0-2500ppm
4.0mA –20.0mA
(default)
“JumperJ3” =“RightMA”
“CO2From” =“0000ppm”
“CO2To” =“2500ppm”
“SigFrom” =“04.00mA”
“SigTo” =“20.00mA”
“Clipping” =“Disable”
4.0mA –21.5mA
0-2500ppm
4.0mA –20.0mA
(defaultwith clipping
enabled byuser)
“JumperJ3” =“RightMA”
“CO2From” =“0000ppm”
“CO2To” =“2500ppm”
“SigFrom” =“04.00mA”
“SigTo” =“20.00mA”
“Clipping” =“Enable”
4.0mA –20.0mA
0-5000ppm
0.0mA –20.0mA
“JumperJ3” =“RightMA”
“CO2From” =“0000ppm”
“CO2To” =“5000ppm”
“SigFrom” =“00.00mA”
“SigTo” =“20.00mA”
“Clipping” =“Enable”
0.0mA –20.0mA
IMPORTANT: TheSignalRange istheapplied range of theanalogoutput signal.The
DisplayRange isindependent ofthesignalrange andisdefined from
0ppmto 5000 ppm.It isnon-linearabove5000 ppmto amaximum of
9999ppm.Negativeconcentrationsmaybe shown,but indicatethat
theunitneedscalibration.Theglobalaverage forCO2isintheorder
of360ppmandshouldbe thelowestconcentration measured under
mostconditions.
1.6Relay
Onesinglepoledoublethrow(SPDT;FormC,Drycontacts)with 1Ampereratingisstandard.
Configuration allowsadjustment foractuation point,deadband,anddelays. Therelay
settingshavethesamerange as thedisplay(0-5000ppm),andareindependent ofthe
analogoutput signal range.
NOTE: Therelaysetpointsmaybe setto operateon declininggas concentrations
simplybysettingthede-actuation setpoint (“RelayOff”)to agreater
concentration thantheactuation setpoint (“RelayOn”).
1.7 Power
TheM-20 canbe powered from anACorDCpowersourcewith nominalvoltage of24V.The
powersupplyisisolated andthereforefewrestrictionsexistinthenumberofwiring
configurations.
NOTE: Thepowerinput isisolated from theinternalpoweroftheunit,but the
analogsignaloutput isnot isolated from theinternalpoweroftheunit.For
installationswhereisolation isrequired forthesignal,thepowersupply
isolation will be sufficient.Theuserneedsto bearinmindthattheanalog
output signalisreferenced to thesecondaryside oftheisolated power
supply.

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2. Operation
Whentheunitispowered up,itdisplaysasoftwarerevision string,followed bythegas
identification stringas shownbelow:
Thedisplayshowsthesoftwarerevision for3seconds:
QEL M-20
V3.01 RA
Where“V3.01” indicatesthesoftwareVersion and“RA” thesoftwareRevision number.
Therevision stringisfollowed by:
CO2ppm
----
Where“----” indicatethatthefirstmeasurement isinprocess.
After10 seconds, thebottom displaylinewill showtheconcentration ofCO2inppm.The
measurement isupdated every10 seconds.
3.FaultIndication
Shouldaninternal faultoccur,theunitwill display:
FAULT 0X
WhereXisafaultcode,rangingfrom 0to 9.Pleasereferto the Troubleshooting section fora
listof faultcodes.
NOTE: Pleasereferto thetroubleshootingsection if you noticeanyunexpected
message indications(e.g.:DefaultsLoaded).Afaultcode will be
displayed for10 seconds, afterwhichtheunitwill restartandattemptto
resumenormal operation.

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4. Configuration
All configuration oftheunit,exceptthesignaloutput mode (setwith J3)isdonethrougha
softwareusermenu system.Themenu systemisprotected byapassword.Toprovide
protection to certainsensitiveparameters, somemenu itemsarehiddenandneed to be
enabled beforetheycanbe accessed.
TheM-20 entersitsmeasurement mode automaticallyafterpowerup.Thefirstconcentration
readingisavailableafter10 seconds. Ifthedefaultconfiguration matchestherequirements
oftheinstallation,thepowerandanalogoutput signalcanbe connected,afterwhichtheunit
will enterservicewhenpowered up.
Iftheinstallation requiresanyofthedefaultsettingsto be altered,itcanbe donethrougha
user-friendlymenu system.Theusersettingsaresaved innon-volatileRAM andwill be
preserved,shouldpowerbe removed duringoperation.
NOTE: It isnot necessaryto opentheenclosureto performcalibration orto change
thedefaultsettings. The‘keypad’switchesarelocated intheupperright side
of theenclosure,andthegas portsarelocated atthebottom (see Figure1).
4.1 UserInterface
TheM-20 userinterfaceconsistsofa2-lineby8-characteralphanumericLCDandathree-
button keypad.
ThetopLCDlineisused to indicatethesettingandthesecondLCD linecontainsthevaluefor
thesetting.Mostsettingsuseanumericvalue(e.g.:0500ppm)andsomeuseatogglestring
(e.g.:“Disable” or“Enable”).
Thekeypadconsistsofthree pushbutton switches. Thepushbutton switchesaremarked S1,
S2andS3.Eachbutton performsaspecificfunction as follows:
S1=Scroll UporIncrement value(topbutton)
S2=Scroll downorDecrement value(middlebutton)
S3=EnterAlteration Mode orAcceptvalue(bottom button)
Thethree switcheswill be referred to as Up(Top),Dn(Middle)andEnter(Bottom).
NOTE: Thepushbutton switchesarerecessed to discourage tamperingwith theunit.
Asmall screwdriver,penorsimilarobjectisrequired to reachtheswitches.
TIP: Twolevelsofkeyrepeatisprovided fortheUpandDnkeys. Aslowrepeat
activatesafterabout half asecondofholdingthekeyin.Afterafew
seconds, thekeywill goto fastrepeatto enablequicksettingof avaluewith
large difference.
4.2 Menu Activation
Press andholdanykeyfor3secondsto activatethepasswordrequestsequence.Selectthe
passwordbyscrollingto theuserpassword(whichisactuallyanumberfrom 0000 to 0255)
usingtheUpandDnkeys. Whenthepasswordisreached,press theEnterkey.
Ifthecorrectpasswordwas entered,thefirstiteminthemenu tree will be shown(see Menu
Tree below).An incorrectpasswordwill be rejected andfollowed byarestartoftheunit,
similarto thepowerupsequence.Enteringnumerousincorrectpasswordscannot causeharm
to theunit,orcauseitto lockout asubsequent validpassword.
NOTE: Thedefaultpasswordis0017,but itcanbe changed bytheuserto any
valuebetween0000 and0255.