Direct Image by Geoprobe - PID

Detector Comparisons

PID

Benzene 2.5 ppm: SRI PID

[graph]

Lamp:	10.6 eV, Current 70
Flow to Detector:	100%
Trunkline:	150′ Peek
Pressure:	12.0 psi
Trunkline Flow:	40.2 mL/min
Nafion Dryer:	82 mL/min
Trip Time:	55 sec
Residence Time:	45 sec
PID Response:	135,000 µV

Probe: MP6520	Temp: 121° C	Membrane: New
Acquisition: FI6000	Controller: MP6505	Date: 7/2009
Operator: Dan Pipp, Geoprobe Systems

Benzene 5 ppm: OI Analytical PID

[graph]

Lamp:	10.6 eV, Intensity 5
Flow to Detector:	55%
Trunkline:	150′ Peek
Pressure:	12.1 psi
Trunkline Flow:	41.8 mL/min
Nafion Dryer:	80.5 mL/min
Trip Time:	55 sec
Residence Time:	45 sec
PID Response:	34,000 µV

Probe: MP6520	Temp: 121° C	Membrane: New
Acquisition: FI6000	Controller: MP6505	Date: 7/2009
Operator: Dan Pipp, Geoprobe Systems

Benzene: OI vs. SRI PID

[graph]

	OI Analytical PID	SRI PID
Lamp:	10.2 eV, Intensity 5	10.6 eV, Current 70
Flow to Detector:	55%	100%
Trunkline:	100′ Peek	150′ Peek
Pressure:	9.1 psi	12.1 psi
Trunkline Flow:	40.3 mL/min	41.8 mL/min
Nafion Dryer:	81.3 mL/min	80.5 mL/min
Trip Time:	32 sec	47 sec
Residence Time:	45 sec	45 sec
Benzene Concentration:	10 ppm	2.5 ppm
PID Response:	70,000 µV	130,000 µV

Probe: MP6520	Temp: 121° C	Membrane: New
Acquisition: FI6000	Controller: MP6505	Date: 7/2009
Operator: Dan Pipp, Geoprobe Systems

Benzene, Gasoline, Toluene, and m-Xylene 5 ppm: OI Analytical PID

[graph]

Compound	Response	Trip Time
Benzene	34,000 µV	55 sec
Gasoline	13,000 µV	55 sec
Toluene	22,000 µV	65 sec
m-Xylene	10,000 µV	100 sec

Flow to Detector:	55%
Trunkline:	150′ Peek
Pressure:	12.1 psi
Trunkline Flow:	39.1 mL/min
Residence Time:	45 sec

Probe: MP6520	Temp: 121 °C	Membrane: New
Acquisition: FI6000	Controller: MP6505	Date: 3-4/2009
Operator: Dan Pipp, Geoprobe Systems

Archive

Benzene OI Analytical PID, 4/2003
Benzene HNU vs. SRI PID, 2/2001