continuous benzene-specific monitoring werner r. haag & stephen powell ion science ipec denver...
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Continuous Benzene-Specific
Monitoring
Werner R. Haag & Stephen
Powell
Ion Science
IPEC Denver 19 November 2015
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Benzene Industrial Exposure
• Oil refineries• Chemical & Petrochemical Plants• Offshore installations, Fracking operations• Coke works• Storage, distribution & use of gasoline or benzene• Foundries, during casting using benzene catalysts
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Benzene in FuelsExposure Limits for Various Fuels
Chemical ACGIH TWABenzene 0.5 ppm
(Carcinogen)
Diesel Fuel 12 ppm
Jet Fuel 30 ppm
Gasoline 300 ppm
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Benzene in FuelsMixture TWA Calculation
TWAtotal =______________1
fgasolinefbenzene +TWAbenz
______ ______TWAgas.
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Benzene in Gasoline
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Benzene in GasolineTypically 0.5 – 2% Difficult to measure selectively
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Tiger Select PID/Tube can measure:
• No Tube: Continuous ppb levels of VOCs for screening
• Insert Tube: Benzene-specific readings – Single Point and 15-minute STEL
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Benzene Monitoring TITAN ContinuousBenzene-Specific Monitor
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Benzene Specific MeasurementMethods with DL near 0.5 ppm
Method Time DL Cost OtherTubes: Manual 10-20 min 0.5 ppm ¢ Single PointTubes: Draeger CMS 10 min 0.2 ppm ¢¢ Single PointPID w/Filter Tube 1-3 min 0.1 ppm $ Single Point
Portable GC 5-10 min 0.1 ppm $$ Single Point
Titan Separator 1 min 0.1 ppm $$$ Continuous
Portable IR <1 min 2 ppm $$$ Continuous
GC: On-Line 1 hour 0.01 ppm $$$$ Semi-Contin.GC: Lab Analysis 1-10 days 0.01 ppm $$$$ Off-sitePortable IMS 1 min 0.01 ppm $$$$ Not Intr. Safe.
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Control of temperature is critical therefore TITAN has two independent temperature control systems.
How TITAN works
Pump
Pump
Sample
PIDTemperature
controlAirSep filter
A large heater ensures an elevated temperature inside the main enclosure.A second heater accurately controls the temperature of the Benzene
separation (Air-Sep) filter tube.
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How TITAN works
AirSep filter PID
Valve
Carbon
Pump
Pump
Sample
TITAN continually draws a sample from the environment and through the instrumentA portion of the air inside the TITAN is scrubbed by a carbon filter, and
used as carrier to separate benzene & then purge the filter tube.A sample is periodically taken to be analysed for benzene content
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TITAN Servicing the Detector Module
Benzene Sep Filter
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Benzene Monitoring Titan Connectivity
2 yrs of data storage
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Performance
Sensor type 10.6 eV PID with selective filtering
Measuring gas Benzene specific
Detection range 0-20 ppm
Measuring frequency Once per minute
Lower limit of detection 0.1 ppm
Accuracy ± 0.05 ppm or ± 10% (whichever is greater)
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Selectivity
100 ppm toluene100 ppm ethylbenzene or xylene100 ppm cyclohexane* or n-hexane**100 ppm undecane100 ppm gasoline 100 ppm naptha (wide cut or light) 50 ppm methyl ethyl ketoneVol % level methane**
Mixture of: 10 ppm toluene, 10 ppm xylenes, 10 ppm hexane, 10 ppm cyclohexane, 10 ppm ethanol
No Interference by:
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The Importance of Continual Monitoring
Time (Hours:Minutes)
Entire events Missed by GC
Sample every minute
Sample every hour
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The Importance of Continual MonitoringB
enze
ne
(pp
m)
19 Days
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Technical SpecificationsHazardous approval ATEX / IECEx: Ex d II B+H2 Gb
Ingress protection IP65
Humidity 0-99% RH (non condensing)
Minimum service period Benzene, Carbon & Dust Filter: 6 monthsPID lamp & sensor grid: 1 year
(-20 0C to +60 0C)Temperature Range
Weight 15 Kg
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Technical specifications
Communication 4-20mARS485 Modbus half and full duplexUSB (when lid removed)Relay x2 (24 Vdc @ 1.25 A max)
Power 19Vdc @ 4.0A24Vdc @ 3.2A32Vdc @ 2.4A
Data storage ON board MMC minimum 2 years
Sample flow 200 ml/min
Gas sample line 10 meters (optional)