Application
News
No. G300A
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© Shimadzu Corporation, 2018
First Edition: Mar. 2018
Revision A: Mar. 2023
01-00000-EN
Analysis of Trace SF6 in the Atmosphere
Since SF6 is a potent greenhouse gas and its emission into
the atmosphere must be avoided, leak tests for insulation
gas from electrical equipment and residue tests after
collecting gas may require analysis of trace amounts of SF6.
Table 2 lists the measurement conditions and Fig. 2 shows
the result of analyzing trace SF6 in the atmosphere.
SF6 at a concentration of 0.1 ppm was detected
(S/N = 24
*1
) and favorable linearity was obtained in the
range from 0.1 to 50 ppm (R
2
= 0.9998).
*1 Determined by calculating noise from the baseline between 0.5
and 1.5 min.
Table 2 Measurement Conditions
Model : Nexis
TM
GC-2030
Detector : BID-2030
Inj. Mode : Split 1:7
Inj.Temp. : 150 °C
Carrier Gas : 45 cm/sec (constant linear velocity)
Column : SH-Msieve 5A (0.53 mm I.D.×30 m, d.f.50 μm)
*1
Column Temp. : 35 °C (2.5 min) – 20 °C/min – 250 °C (0 min) –
15 °C/min – 270 °C (3.42 min)
Purge flow : 3 mL/min
Det. Temp. : 280 ˚C
Discharge Gas : 50 mL/min (He)
Inj. Volume : 3.0 mL (MGS-2030)
*1 P/N: 221-75763-30
Analysis of SF6 Decomposition Gas
SF6 is used as an insulation gas in circuit breakers. Breakers
are installed on electrical grids to shut off high voltages
that may occur due to causes such as lightning strikes.
When performing maintenance on such breakers, SF6
decomposition gases are analyzed to judge the degradation
level of insulation gas. Table 3 lists the measurement
conditions and Fig. 4 shows the results of an example
analysis of CF4 and SOF2 which are SF6 decomposition gases.
Sample injection using a gas sampler and a gas-tight
syringe is possible on the same system, allowing analysis
of gas samples in various forms and concentrations.
Table 3 Measurement Conditions
Model : Nexis
TM
GC-2030
Detector : BID-2030
Inj. Mode : Split 1:4
Inj.Temp. : 150 °C
Carrier Gas : 7 mL/min (constant flow rate)
Column : MICROPACKED-ST 1.0 m × 1.0 mm I.D.
(Input 1,250 m × 0.50 mm I.D. and df = 15 μm for
flow rate calculation)
Column Temp. : 50 °C (1.0 min)– 25 °C/min – 150 °C (0 min) –
5 °C/min – 200 °C (0 min)
Purge flow : 3 mL/min
Det. Temp. : 280 ˚C
Discharge Gas : 50 mL/min (He)
Inj. Volume : 200 μL (gas-tight syringe)
Fig. 2 Analysis of Trace SF6 (0.1 ppm) in the Atmosphere
Fig. 3 Linearity of SF6 in the Atmosphere (0.1 to 50 ppm)
Fig. 4 Analysis of SF6 Decomposition Gases
(CF4: 310 ppm, SOF2: 107 ppm)
Nexis is a trademark of Shimadzu Corporation or its affiliated
companies in Japan and/or other countries.
SF
6
H
2
O
2
0.5 1.0 1.5 2.0 2.5 min
0 10 20 30 40 50
Concentration (ppm)
0
100000
200000
300000
400000
500000
600000
700000
800000
900000
1000000
1100000
1200000
Area (μV·sec)
R
2
= 0.9998
2.5 5.0 7.5 10.0 12.5 min
CF
4
SOF
2
Air
CO
2
SF
6
