10
（
3
）
Operation: Extract 1 millilitre of pure sulfur hexafluoride with a
one-litre cylinder from the steel bottle. Inject it into 100-millilitre cylinder and
dilute it with air outdoors. The concentration degree is 10000ppm. Again,
extract 5 millilitre 10000ppm sulfur hexafluoride with a twenty-milliliter from a
100-millilitre cylinder and inject it into another 100-millilitre cylinder. Dilute it
with air outdoors to 100 millilitres. Its concentration degree is 500ppm. The
same operation can be applied for 100ppm, 10ppm, 1ppm, 0.1ppm and
0.01ppm. Each should be marked to be tested.
2. Demarcation of the leakage detector:
When the instrument is shut down, press OK to switch on the
detector( enter the interface of detection demarcation). After 15 minutes the
machine gets stable. Press
&
at the same time to enter
demarcation interface. At this time the demarcation number is shown on the
interface. Press + or
–
to alter the number of points which need to be
demarcated. Press OK and then demarcate the first point. Input OPPM and
then press OK. Input 1010, which is the first point
’
s collecting number. Press
OK and then QUIT to enter the demarcation interface. Thus the demarcation of
the first point is finished. The detection of the prepared SF6 gas begins. Use
20-millilitre cylinder to extract 10 millilitre of the prepared sulfur hexafluoride
with different concentration degree. Take off the needle of the cylinder and
connect the intake port of cylinder and probe. The probe will take in the gas to
be detected by itself. At the moment the signal value on the lower left corner of
the LCD of the detector will increase. Record the reading when the displayed
data turns stable ( Record the seven sample gases in turn) . The interface
shows the demarcation point now. press + or
–
to alter the number of points to
be demarcated and press OK. Then demarcate the first point (zero point).
Input OPPM and press OK. Input the collecting number 1010 at zero point and
then press OK. Press
again to alter the point number to the second
point( 0.01 PPM ) and then press OK again to input the collecting value of 0.01
