Southland H2S-625 User manual

H2S-625
Hydrogen Sulde Analyzer
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Rev 1.01 July 5th, 2023_BB
Instruction Manual
H2S-625 Hydrogen Sulde Analyzer
ATEX and IECEx Certied for Hazardous Areas

Part 1 Introduction
Part 2 Installation
Part 3 Operation
Part 5 Annexures
Part 4 Maintenance
1.1 General Introduction
1.2 PrincipleofOperation-TheHydrogenSuldeSensor
1.3 H2S-625Specications
1.4.1 General Safety Information (VAC)
1.4.2 General Safety Information (VDC)
1.5 Location Installation Considerations
1.6 Safety Considerations
2.1 ReceivingYourNewHydrogenSuldeAnalyzer
2.2 MountingTheHydrogenSuldeAnalyzer
2.3.1 Electrical Connections (VAC)
2.3.2 Electrical Connections (VDC)
2.3.3 EarthGroundingTheAnalyzer
2.4 Gas Connections
2.5 InstallingTheHydrogenSuldeSensor
2.6 Integral Sample System Flow Diagram
2.7 Sensor Selection
3.1 Understanding The Controls and Their Operation
3.2 Manual Range Output Adjustment
3.3 Analog Output 4 - 20mA or 1 - 5 VDC
3.4 Advanced Integral Alarms
3.5 Setting a Custom Range
3.6 Output Simulation
3.7 Output Calibration
4.1 SpanCalibrationUsingCertiedSpanGas
4.2 Procedure for Replacing the Sensor
4.3 Troubleshooting
5.1 Spare Parts List
5.2 Warranty
5.3 Material Safety Data Sheets
5.4 ConformanceCerticate
5.5 Modbus Instructions
5.6 Explosion Proof Electrical Connections
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Table of Contents
H2S-625 Hydrogen Sulde Analyzer

1.1 General Introduction
TheSouthlandSensingH2S-625HydrogenSuldeAnalyzerisamicroprocessorbasedonlineunitde-
signedforcontinousmeasurementsinavarietyofhazardousareaapplicationsandgasmixtures.The
AnalyzeriscertiedforuseinZone1GroupIIB+H2(ATEX,IECExandUKEX).
Theanalyzerwasdesignedwiththecustomerinmind,keepingtheoperationssimplewhilestillfeatur-
ingafastresponseandruggeddesign.Everyeorthasbeenmadetousemodernindustrialcompo-
nents and materials which has resulted in an advanced design, excellent performance, and an overall
low cost of ownership.
TheanalyzerhasnumerousoptionsincludingVACorVDCpowerinputwithanisolatedanalog4-
20mA or 1-5 VDC concentration output and optional digital RS485 Modbus RTU output meeting most
hydrogensuldeanalysisapplications.
Southland Sensing Ltd. appreciates your business and recommends reading through the complete
manualtobeabletogetthefullexperiencefromyournewhydrogensuldeanalyzer.
1.2 Principle of Operation - The Hydrogen Sulde Sensor
TheprecisionelectrochemicalhydrogensuldesensorusedintheH2S-625isdesignedandmanufac-
tured under a strict quality procedure.
Tounderstandhowthehydrogensuldeanalyzerfunctions,itisimportanttounderstandalittlebitof
the sensor characteristics.
Theactivecomponentsintheprecisionelectrochemicalhydrogensuldesensoraretheanode,cath-
ode,andaqueouselectrolytewhichareallhousedinthecellbody.Thehydrogensuldemoleculesin
the application pass through the front sensing membrane into the electrolyte, where a chemical reac-
tion occurs and a raw electrical current is generated.
TheseanalyzersneedtobecalibratedusingaspangaswithaknownH2Svalue.It’simportanttocali-
bratewiththesameowrateasyourprocessgas,werecommendaowbetween0.5-1.5SCFH.
Thiselectricalcurrentisproportionaltotheamountofhydrogensuldeintheapplication.Theanalyz-
er then processes this raw electronic signal, compensates for temperature, barometric pressure, and
owvariations,andconvertsthedataintoaparts-per-millionhydrogensuldemeasurementvalue.
Thehydrogensuldeconcentrationreadingisthendisplayedinrealtimeonthefullbacklitdisplayand
the user can automate the control of their process using any of the output signals which can be run to
Introduction
H2S-625 Hydrogen Sulde Analyzer
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com

Precision Electrochemical H2S Sensor
Designed for Natural gas & Biogas Applications
F.S. Ranges of 0 - 10 ppm up to 0 - 10000 ppm
Cost Eective and Low Maintenance
Large Backlit Display
Intuitive User Friendly Interface
Optional MODBUS RS485 RTU
2 Fully Congurable Alarm Relay Contacts
Specications:
Accuracy: < +/-1% Full Scale Range*
Alarms: 2 Congurable Relay Contacts
Analyzer Range: Multiple up to 0 - 10000 ppm
Area Classication: Zone 1 IIB + H2
Dimensions: 12” x 12”x 5.25”
Flow: 0.50 - 5.0 SCFH
Gas Connections: 1/4” Compression Tube
Output: Isolated 4 - 20mA or 1 - 5 VDC
Power: 12 - 24 VDC
100 - 240 VAC
Pressure 0.1 - 50 PSIG Inlet, vent to atm
Response Time: T90 in 45 Seconds
Sample System: Optional
Sensor: Precision Electrochemical Cell
Temperature: 0 to 50 deg C
Warranty Sensor: 12 Months
Warranty Electronics: 12 Months
Weight: 21 lbs
*Accuracy at constant conditions
Applications:
“Inquiry for Application Expertise”
• Natural Gas Extraction & Pipelines
• Natural Gas Processing
• Landll Gas Monitoring
• Biogas before and after the H2S Scrubber
• And Many Other Industrial Applications
ProductSpecicationSheet
H2S-625 H2S Analyzer
HazardousAreaOnlineProcessHydrogenSuldeAnalyzerw/SampleSystem
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Cross Sensitivity
Sensor response per 100 ppm of gas present:
Methyl Mercaptan: 40 ppm
Carbon Monoxide: 4 ppm
Hydrogen: 1 ppm
Sulfur Dioxide: 18 ppm
ATEX and IECEx Certied for Hazardous Areas
Optional Congurations:
- Sample System Add-On Components
- Bi-Directional RS485 Modbus RTU
- Extreme Weather Packaging
- Extended Temperature Ranges
Rev 1.09 July 5th, 2023_BB
2804

H2S-625 H2S Analyzer Product Specications
H2S Analyzer: H2S Sensor Technology:
Order Information:
Power Requirements:
H2S Sensors:
Record Part Number with selected options in Blank Indicated Area of Form
Model Number:
H2S-625H2SAnalyzer
Selected Range & Sensor:
1 0 - 200 PPM; H2S-1x PPM H2S Sensor (Ranges: 0 - 10 ppm, 0 - 50 ppm, 0 - 100 ppm, 0 - 200 ppm)
2 0 - 2000 PPM; H2S-2x PPM H2S Sensor (Ranges: 0 - 100 ppm, 0 500 ppm, 0 - 1000 ppm, 0 - 2000 ppm)
3 0 - 10000 PPM; H2S-3x PPM H2S Sensor (Ranges: 0 - 1000 ppm, 0 - 2000 ppm, 0 - 5000 ppm, 0 - 10000 ppm)
H2S-625 - - -
The H2S sensor used in the H2S-625 is based on the galvanic
electrochemical fuel cell principal. All H2S sensors are manu-
factured under a strict quality program.
The sensors are self-contained and minimal maintenance is
required - no need to clean electrodes or add electrolyte.
TheSouthlandSensingprecisionH2Ssensorsoerexcel-
lentperformance,accuracyandstabilitywhilemaximizingthe
expected life.
H2S-1x PPM H2S Sensor: 0 - 200 Max PPM Range
H2S-2x PPM H2S Sensor: 0 - 2000 Max PPM Range
H2S-3xPPMH2SSensor:0-10000MAXPPMRange
H2S sensors should be periodically calibrated. Factory recom-
mendation is every 1 - 3 months or as the application dictates.
Sensorsoerexcellentlinearitywhencalibratedtoacertied
span gas.
ThemodelH2S-625HydrogenSuldeanalyzer
combinesaruggeddesignwithSSO2’sprecision
H2S sensors. The result is a highly reliable and cost
eectivecompactdesignwithaneasy-to-useuser
interfacedesignedspecicallyfortheNaturalGas
and biogas industries.
TheoxygenanalyzeriscertiedforuseinZone1
IIB+H2applications.
TheH2Sanalyzerisisolatedbothonthepower
input and analog output. This eliminates most
electronic gremlins seen with existing competitive
equipmentintheeld.
Gasconnectionsaremadewith1/4”Compression
tubettings.SampleSystemsincludesSample/
Spanvalveandowmeter.
TheH2S-625analyzercomeswithanoptional
MODBUSRS485RTUBi-DirectionalCommunication
protocol.
Input Power: 12 - 24 V DC
Current Draw: 50 mA
** Optional power input choices available
Use This Part Number When Ordering
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Electronics Package:
4 12 - 24V DC Input Power
4M12-24VDCInputPower+MODBUSRS485RTU
7 100 - 240 VAC Input Power
7M100-240VACPower+MODBUSRS485RTU
Gas Connections:
41/4”CompressionTubeFittingswithSample/SpanValve&Flowmeter
6 6 mm CompressionTubeFittingswithSample/SpanValve&Flowmeter
DDeleteSample/SpanValve&FlowMeter,1/8”CompressionTubeFittings
Rev 1.09 July 5th, 2023_BB

H2S-625 H2S Analyzer Product Certications
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Rev 1.09 July 5th, 2023_BB
ATEX:
Southland Sensing Ltd.
4045 E. Guasti Rd. Suite 203, Ontario, CA 91761 USA
H2S-625 Series Hydrogen Sulde (H2S) Analyzer
ExVeritas 23ATEX1653X
II 2 G
Ex db ib IIB+H2 T4 Gb
Tamb -20⁰C to +50⁰C
IECEx:
Southland Sensing Ltd.
4045 E. Guasti Rd. Suite 203, Ontario, CA 91761 USA
H2S-625 Series Hydrogen Sulde (H2S) Analyzer
IECEx EXV 23.0038X
II 2 G
Ex db ib IIB+H2 T4 Gb
Tamb -20⁰C to +50⁰C
2804
2804

1.4.1 General Safety & Installation (VAC)
ThissectionsummarizestheprecautionsapplicabletotheH2S-625HydrogenSuldeAnalyzer.Ad-
ditionalprecautionsspecictothisanalyzerarecontainedinthefollowingsectionsofthemanual.To
operatetheanalyzersafelyandtoobtainthebestperformance,followthebasicguidelinesoutlinesin
thisowner’smanual.
CAUTION:
WARNING:
CAUTION:
Thissymbolisusedthroughouttheowner’smanualtowarnandalertthe
user of the presence of electrostatic discharge.
Thissymbolisusedthroughouttheowner’smanualtocautionandalert
theusertorecommendedsafetyand/oroperatingguidelines.
Thissymbolisusedthroughouttheowner’smanualtocautionandalert
the user that this device is operated on AC Voltage (VAC)
READ INSTRUCTIONS:Beforeoperatingthehydrogensuldeanalyzer,readtheinstructions.
RETAIN INSTRUCTIONS:Thesafetyprecautionsandoperatinginstructionsfoundintheowner’s
manual should be retained for future reference.
FOLLOW INSTRUCTIONS: Observe all precautions and operating instructions. Failure to do so may
result in personal injury or damage to the transmitter.
H2SANALYZERLABEL:
Introduction
H2S-625 Hydrogen Sulde Analyzer
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Model Number: H2S-625
Serial Number: 0036785
Hydrogen Sulde Analyzer
Voltage: 100 - 240 VAC
Max Current: 100mA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA
Ph: [phone] Web: www.sso2.com
ThissectionisforACpoweredanalyzers,ifyouranalyzerisDCpoweredproceedtothenextpage.
PleaserefertoAppendix5.6formakingelectricalconnectionsthatmaintainsthedesiredlevelof
protection.

1.4.2 General Safety & Installation (VDC)
ThissectionsummarizestheprecautionsapplicabletotheH2S-625HydrogenSuldeAnalyzer.Ad-
ditionalprecautionsspecictothisanalyzerarecontainedinthefollowingsectionsofthemanual.To
operatetheanalyzersafelyandtoobtainthebestperformance,followthebasicguidelinesoutlinesin
thisowner’smanual.
CAUTION:
WARNING:
CAUTION:
Thissymbolisusedthroughouttheowner’smanualtowarnandalertthe
user of the presence of electrostatic discharge.
Thissymbolisusedthroughouttheowner’smanualtocautionandalert
theusertorecommendedsafetyand/oroperatingguidelines.
Thissymbolisusedthroughouttheowner’smanualtocautionandalert
the user that this device is operated on DC Voltage (VDC)
READ INSTRUCTIONS:Beforeoperatingthehydrogensuldeanalyzer,readtheinstructions.
RETAIN INSTRUCTIONS:Thesafetyprecautionsandoperatinginstructionsfoundintheowner’s
manual should be retained for future reference.
FOLLOW INSTRUCTIONS: Observe all precautions and operating instructions. Failure to do so may
result in personal injury or damage to the transmitter.
H2SANALYZERLABEL:
Introduction
H2S-625 Hydrogen Sulde Analyzer
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Model Number: H2S-625
Serial Number: 0036785
Hydrogen Sulde Analyzer
Voltage: 12 - 24 VDC
Max Current: 50mA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA
Ph: [phone] Web: www.sso2S.com
ThissectionisforDCpoweredanalyzers,ifyouranalyzerisACpoweredseethepreviouspage.
PleaserefertoAppendix5.6formakingelectricalconnectionsthatmaintainsthedesiredlevelof
protection.

1.5 Location Installation Considerations
1.6 Safety Considerations
Thehydrogensuldeanalyzerisdesignedforinstallationintoeitherageneralpurposearea,orZone1
IIB+H2.
Theanalyzerconsistsoftwoenclosuresmountedonasinglebackpanel.ThesmallAdaletenclosure
on the left side is explosion-proof and contains the electrical connections for the user such as power,
alarms,analogoutput,anddigitalMODBUSoutput(ifapplicable).Thisexplosion-proofenclosurealso
contains the power supply and safety components for the other enclosure. The enclosure on the right
contains the analytical circuitry, the oxygen sensor, and the oxygen sensor housing. This circuitry is
designedforintrinsicsafetyandmeetsrequirementsforZone1IIB+H2.
WheninstallingaZone1IIB+H2devicepleasefollowyourlocalelectricalcodeshouldtheareaneed
tobedeclassiedpriortoinstallation.
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Introduction
H2S-625 Hydrogen Sulde Analyzer
TheSouthlandSensingH2S-625H2SAnalyzerisdesignedtobemountedonawalloronapipeina
generalpurposeorZone1IIB+H2area.Wheninstalledoutdoorsinextremecoldareasaheavyduty
heatedenclosureisrecommended.Consideralsogivingtheanalyzerasunshieldifitisgoingtobe
mounted in the direct sunlight.
Referenceyourlocalelectricalauthorityfortheproperinstallation.Referencesection5.6forspecic
gland requirements.
Seals/glandsarerequiredonthepowerandsignalconduletentries,referenceyourlocalelectrical
authority for the proper installation and section 5.6.
TheanalyzerisEMI/RFIprotected,howeveritisgoodpracticenottomountittooclosetosources
of electrical interference such as large transformers, motor start contactors, relays, large pumps, etc.
Alsoavoidsubjectingtheanalyzertosignicantvibration.
Mount the unit at a suitable eye level to easily read the local display. Gas connections are located on
thetoprightsideoftheanalyzer,ensurethereisadequateroomtohookupyourgaslines.

2.1 Receiving Your New Hydrogen Sulde Analyzer
Assoonasyoureceiveyournewhydrogensuldeanalyzercarefullyunpacktheunitandaccessoriesand
inspecttheinteriorandexterioroftheanalyzerfordamage,andalsoverifythehydrogensuldesensoris
present.
Ifdamagetoanyportionofthenewanalyzerispresent,stopandreportdamagetotheshippingcom-
pany as well as the factory.
Theanalyzerisshippedwithallmaterialsneededtoinstallandpreparethesystemforoperation.In
some instances, added sample system components are necessary to condition the gas sample before en-
teringthesensorhousing.SouthlandSensingoersfreeapplicationconsultationandweencourageyou
totakeadvantageofourengineersandtheirexpertise.
ItisalsoimportanttobemindfulofEMI/RFInoiseinterference.ProtectionfromEMI/RFInoiseisim-
portant for accurate readings.
Installation
H2S-625 Hydrogen Sulde Analyzer
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com

2.2 Mounting the Hydrogen Sulde Analyzer
The H2S-625 is designed to be mounted on a wall or around a pipe. See below for the mounting dimen-
sions. If mounting in extreme temperature consider an enclosure and heater if necessary.
Refer to Part 3: Operation section of this instruction manual for more information on how to operate the
controlsofthishydrogensuldeanalyzer.
RefertoPart4:Maintenancesectionforanoverviewonhowtocalibratethedeviceusingacertied
span gas.
Aprecisionelectrochemicalhydrogensuldesensorisincludedasaseparateitemandmustbeinstalled
prior to instrument use.
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Installation
H2S-625 Hydrogen Sulde Analyzer
H2S-625MountingDimension(Sizesareininches):

2.3.1 Electrical Connections (VAC)
Incomingpower/signaloutput
connections are made to the green
terminalblocklocatedonthe
Backoftheunit.
Donotsupplyvoltagemorethanspeciedin
thismanualandnotedontheanalyzerlabel
inside of the unit.
Shielded cable is recommended when connect-
ing power and signal output.
Voltage: 100 - 240 VAC
Max Current: 100 mA
Avoid electrostatic discharge
** Note: This device is designed to be integrated
with a PLC or DCS system. The power input should
be 100 - 240 VAC. The electronics self generate a
4 - 20mA analog output.
If optional RS485 Modbus RTU is not included J3
connectors will not be loaded.
DONOThookuppowertoeithertheANALOG
OUTPUT or RANGE ID as the circuit will be dam-
aged.
Follow your local electrical
authority for proper procedure.
It is also recommended to
makesureyouhavethepropersealsforyour
condulet to meet your required installation
consideration.Checkwithyourlocalelectrical
authority.
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Installation
H2S-625 Hydrogen Sulde Analyzer
ThissectionisforACpoweredanalyzers,ifyouranalyzerisDCpoweredproceedtothenextpage.
Note: For proper earth grounding, reference section 2.3.3.

2.3.2 Electrical Connections (VDC)
Incomingpower/signaloutput
connections are made to the green
terminalblocklocatedonthe
Backoftheunit.
Donotsupplyvoltagemorethanspeciedin
thismanualandnotedontheanalyzerlabel
inside of the unit.
Shielded cable is recommended when connect-
ing power and signal output.
Voltage: 10 - 24 VDC
Max Current: 100 mA
Avoid electrostatic discharge
** Note: This device is designed to be integrated
with a PLC or DCS system. The power input should
be 10 - 28 VDC. The electronics self generate a 4 -
20mA analog output.
If optional RS485 Modbus RTU is not included J3
connectors will not be loaded.
DONOThookuppowertoeithertheANALOG
OUTPUT or RANGE ID as the circuit will be dam-
aged.
Follow your local electrical
authority for proper procedure.
It is also recommended to
makesureyouhavethepropersealsforyour
condulet to meet your required installation
consideration.Checkwithyourlocalelectrical
authority.
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Installation
H2S-625 Hydrogen Sulde Analyzer
ThissectionisforDCpoweredanalyzers,ifyouranalyzerisACpoweredgotothepreviouspage.
Note: For proper earth grounding, reference section 2.3.3.

Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Installation
H2S-625 Hydrogen Sulde Analyzer
2.3.3 Earth Grounding The Analyzer
Analyzer Ground Terminal Must Be Connected to Earth Ground. Conductor Size Must Be
At Least The Size Of The Power Supply Input Wire.
Analyzer Ground Terminal Must Be Ground

2.4 Gas Connections
The H2S-625 can accept either an H2S-1x (200 ppm max), H2S-2x (2000 ppm max), or H2S-3x (10,000
ppmmax)hydrogensuldesensorfortraceH2Sanalysis.Forhelpselectingasensor,contactyourlocal
sales representative or the factory.
Priortoinstallingthesensor,itisimportanttoensurethatthegaslinesarehookedupandthe
unitisreadytopurge.Connecttheprocessgaslineandsetyourowbetween0.5-1.5SCFH.
Ideally,boththespanconnectionandsampleconnectionwillhavethesameow.Werecom-
mend0.5to1.5SCFH.ItisnecessarytomatchtheowrateoftheSPANbottleandprocessgas
tomaximizeaccuracy.
To install the sensor:
- Open up the square enclosure which will give you access to the sensor housing.
- Remove the cell holder cap by unscrewing the stainless steel collar.
 -Liftthestainlesssteelcollaroandsetitaside.
 -Removethesensorfromitspackaging.
- Visually inspect the sensor for damage. If damaged, notify the factory immediately.
 -InspecttheO-ringforcracks,replaceifnecessary.Always lubricate your O-rings.
- Place the sensor inside the housing with the white sensing element facing down and the
circuit board facing up.
- Tighten collar. Hand tight is acceptable to create an air-tight seal.
 -Installtheatribboncabletothebackofthecircuitboard(seephotobelow)
 -Makesurethecontactpinsontheribboncablealignwiththecontactpinsonthecircuit
board connector. The ribbon cable contact pins should be facing towards the center of
the sensor.
 -Iftheanalyzerhasnotbeencalibrated,refertosection4.1formoreinformation.
 -Thesensor/analyzershouldbecalibratedevery1-3monthswithacertiedbottleof
SPAN gas.
Part 2 Installation
H2S-625 Hydrogen Sulde Analyzer
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
2.5 Installing the H2S Sensor
Gasconnectionsaremadevia1/4”compressiontubettings.Thegasconnectionsarelocatedbelowthe
sample system on the bottom right. Sample connections are designed for your process gas. Span connec-
tionsaredesignedforacertiedbottleofcalibrationgas(required).Ventistheoutlet,typicallydesigned
toventtotheatmosphere,aarestack,orperyourlocalregulations.
Ribbon Cable ConnectionH2S Sensor Front and Rear View
Rear View
(CircuitBoard)
Front View
(Sensing Surface)

2.6 Integral Sample System Flow Diagram
SouthlandSensingLtd.strivestoselectthehighestqualitysamplesystemcomponentsinthemarket.All
gasconnectionsaremadeviacompressiontubettings.Ourvalvesarehighqualityandleaktightwhich
werigorouslytestinourenvironmentalchamber.Ourowindicators/owmetersarefromDwyer,an
industryrecognizedleaderinowcontrolWhendealingwithcriticalapplicationssuchaspetrochemical
processingandnaturalgasextraction,wewanttomakesurewecandeliverahighqualitysamplesystem
andwedosobypartneringwithsomeofthebestbrandsinthemarket.
Along with our standard sample system as shown below, we can also custom design sample systems to
meetuniqueapplicationsincludingtheadditionalofmoisturelters,pressureregulators,etc.Formore
information on a custom solution for your application, please contact your local distributor or the factory.
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Installation
H2S-625 Hydrogen Sulde Analyzer
3-Way
Valve
Sample In
Span In
Flow
Meter
Sensor
Housing
Vent

3.1 Understanding the Controls and their Operation
TheH2S-625HydrogenSuldeAnalyzerisafeaturepackedunitwithaneasy-to-usemenuinterface.
Thekeyattributeswithinthemenuaretheabilitytoselectameasurementrangemanuallyorusing
theauto-rangemode,tocalibratetheunitwithaknowngas,alsoreferredtoasaSPANCalibration
orSPANCAL,andtoperformazerocalibration(ifnecessary,formostapplicationsitisnotrequired).
Allfeaturesareprogrammable/selectablethroughtheMENUbutton.TheUP/DOWNbuttonswill
allow you to select your set points and the ENTER button saves the data. If you want to cancel your
selection,orreturntothepreviousscreentheescapekeyESCwillallowyoutodothis.Oncetheunit
starts up, the following home screen will appear:
Current H2S Reading
Identier,Manual
or Auto Range
Operation
H2S-625 Hydrogen Sulde Analyzer
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Alarm 2 Setting
Alarm 1 Setting
Alarm 1 H2S Level Alarm 2 Range
Operating Range

3.2 Measurement Range Overview
TheH2S-625hydrogensuldeanalyzerallowstheusertoeldselect4availableranges-custom
ranges can be programmed in the built-in menu, see Section 3.5. These ranges can be selected in
manualmode,meaningtheyarelockedintothatrangebytheuser,ortheycanbesettoauto-range
sotheanalyzerwilladjusttogiveyouthebestfullscaleresolution.
WhenusingtheManual-RangemodetheManualRangelocksthe4-20mAoutputtoasinglerange,
and the display will continue to operate in auto-range mode giving the user the full spectrum of
analysisranges.Othermanufactureslockthedisplayaswell-theproblemisifyouover-rangeand
thedisplayislockedyouhavenoideawhatyourhydrogensuldevalueis.TheH2S-625solvesthis
issuewithadisplaythatauto-rangesandtheabilitytomanuallylocktheanalogoutputs.
ToselectAuto-RangeorManual-RangeMode,fromtheHOMEscreen,presstheMENUkeyandthe
display will indicate:
UsingtheUP/DOWNkeystochangewhichoptionishighlighted
will allow the user to select AUTO-RANGE, which will all the unit to
cyclethroughallveranges,orMANUALRANGEwhichwillallow
theusertoselectaspecicrange.
Decidewhichoptionwillworkbestforyourapplication.
HighlighttheselectionandpresstheENTERkey.Ifyou
haveselectedtheAUTORANGEoption,itwillblinkfora
second indicating this was selected. If you selected the
MANUAL RANGE option, the following screen will be brought up:
H2S-1x: 0 - 10 ppm, 0 - 50 ppm, 0 - 100 ppm, 0 - 200 ppm
H2S-2x: 0 - 100 ppm, 0 - 500 ppm, 0 - 1000 ppm, 0 - 2000 ppm
H2S-3x: 0 - 100 ppm, 0 - 2000 ppm, 0 - 5000 ppm, 0 - 10000 ppm
If a custom range has been set, it will appear below the lowest range.
UsetheUP/DOWNkeystohighlighttherangetobeselectedandpress
theENTERkey.Theselectedrangewillblinkforasecondindicatingtherangehasbeenselected.
PresstheESCkeytomovebacktothepreviousscreen.
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Operation
H2S-625 Hydrogen Sulde Analyzer
MANUAL RANGE
0 - 200 PPM
0 - 100 PPM
0 - 50 PPM
0 - 10 PPM
MAIN MENU
AUTO RANGE
MANUAL RANGE
SPAN CAL
ZEROCAL
ALARM 1
ALARM 2
SYSTEM

3.3 Analog Output
** Caution: Integral 4 - 20mA converters are internally powered and do not re-
quire external power. DO NOT supply any voltage across these terminals as the
4 - 20mA output will be damaged. It is also important to assure proper ground-
ing of the external recording device such as a PLC, DCS prior to connecting the 4
- 20mA.
The H2S-625 is equipped with a 4 - 20mA analog output. When physically connecting the analog
output, refer to the circuit board pinout in section 2.3
Toverifythesignaloutputofthe4-20mAcircuitisworkingproperly,connectanammeteracrossthe
(+)and(-)pins.Withnohydrogensuldesensorconnected,itshouldreadapproximately4mA.Ifa
sensor is installed you can verify the signal matches with the following formula:
  SignalOutput(mA)=[(Reading/FullScaleRange)x16]+4
For example, if we are reading 500ppm on the 1000 ppm range:
  SignalOutput(mA)=[(500/1000)x16]+4
Signal Output (mA) = 12mA
SomePLC’sprefera1-5VDCanalogoutput.Theoutputcanbeconguredforeither4-20mAor
1-5 VDC using the built-in menu. Enter the MENU and select SYSTEM, select OUTPUT TYPE and it will
allow you to select either analog output (4 - 20mA or 1 - 5V DC).
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
Operation
H2S-625 Hydrogen Sulde Analyzer

TheH2S-625HydrogenSuldeAnalyzerisequipedwith2advancedrelaycontactalarms.These
alarmscanbeconguredasnormallyopenornormallyclosed,haveadelaymodebuilt-in,andcan
be enabled or disabled when necessary.
The alarms are rated at 5A @ 230VAC. If you are connecting to solenoid valves or a pump whose
currentcanuctuategreatly,itisadviseabletouseaslaverelaytoensurenodamageoccurstothe
electronics.
The procedure for setting Alarm 1 and Alarm 2 is identical. To begin,
highlightthealarmcongurationyouwanttoadjustusing
theUP/DOWNkeysintheanalyzerMENUandpressENTER.
To adjust the value setpoint of ALARM 1 simply highlight ALARM 1
and press ENTER. Select the ADJUST ALARM option, where you
willbeabletoadjustthelevelsusingtheUP/DOWNbuttons.Toset
a PPM level alarm simply hold the DOWN button until you get below
1%. To set the alarm press ENTER.
The alarm function allows the user to set the alarm to trigger the relay
contacts as a HIGH alarm or a LOW alarm. Simply
open the ALARM 1 menu and UP or DOWN to meet your
requirements.
The alarm has a built in DELAY TIME. This is ideal to use when you
areworkingonyourprocessanddonotwanttohavethealarmrelay
contacts trip. You will set this in a similar fashion to setting the alarm.
The DELAY TIME is in minutes, so adjust the value accordingly.
Thealarmcanalsobeenabled/disabledshoulditbehookedupbut
notrequired.HighlightALARMON/OFFusingtheUP/Downkeysto
andpresstheENTERkey.
The alarms can function as normally open or normally closed. This
selectionwillbechoosenwhenhookingupthewiring,itisnot
completed through the software. See the wiring diagram in section 2.4
for more information.
If you any questions about the ALARM functions should arise, please
contact the factory for assistance or technical questions.
3.4 Advanced Integral Alarms
Operation
H2S-625 Hydrogen Sulde Analyzer
Designed, Tested, and Assembled in California, USA
4045 E. Guasti Rd. #203 Ontario, CA 91761 USA : 1-949-398-2879 : [email protected] : www.sso2.com
ALARM 1 MENU
ALARMON/OFF
ALARM TYPE
ADJUST ALARM
DELAY MODE
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