The Sensor
A single IR analyzer was located just 100 feet northwest of the SF6 source.
The analyzer was the MIRAN SapphIRe portable ambient-air analyzer.
http://www.thermoei.com/sap30.htm

The Location
The air sample delivered to the IR analyzer was collected simultaneously at
four points between the Heber Wells and Federal building. The four points
create a line about 15 m long. The closest Blue Box locations to this line
are numbers 13 and 14.

The Data
SF6 was sampled continuously, and every 5 seconds the maximum (Max),
minimum (Min),and average (Avg) concentrations were stored. See a small
portion of the data in the table below. The listing below is a sample of the
data from this analyzer. Time is in MST. All concentrations are in ppb. The
Range is simply the difference between the Max and Min readings. The range is
an indication that sampler is truly detecting SF6. The baseline (Base)
concentration is computed by interpolating between average concentrations
when the analyzer is outside of the plume of SF6. The true concentration of
SF6 (Actual Avg) is the difference between the measured average (Avg) and
the baseline (Base).

The Workbooks
The data from this sampler are in a series of Excel workbooks, one per IOP,
six IOPs in all. The sampler participated in all three SF6 releases during
IOPs 2, 4, 5, 7, 9, and 10, except for the first release of IOP 7. Also,
during the first release of IOP 9, the analyzer was carried around to sample
the air directly at the release point. 


Time (MST)    	Max	Min	Avg	Range	Base	Actual Avg
10/7/00 0:00:39	0	0	0	0	0	0
10/7/00 0:00:44	0	0	0	0	0	0
10/7/00 0:00:49	0	-1	0	1	0	0
10/7/00 0:00:54	0	-1	0	1	0	0
10/7/00 0:00:59	1	0	0	1	0	0
10/7/00 0:01:04	1	0	0	1	0	0
10/7/00 0:01:09	1	0	0	1	0	0
10/7/00 0:01:14	3	1	2	2	0	2
10/7/00 0:01:19	6	3	4	3	0	4
10/7/00 0:01:24	13	6	9	7	0	9
10/7/00 0:01:29	38	13	23	25	0	23
10/7/00 0:01:34	79	38	58	41	0	58
10/7/00 0:01:39	124	79	100	45	0	100
10/7/00 0:01:44	189	124	155	65	0	155
10/7/00 0:01:50	224	189	212	35	0	212
10/7/00 0:01:55	222	156	191	66	0	191
10/7/00 0:02:00	156	135	140	21	0	140
10/7/00 0:02:05	163	136	148	27	0	148
10/7/00 0:02:10	193	163	177	30	0	177