PerkinElmer Photovac 2020, Manual

Page: 105 / 190

Connecting Accessories
103
2. Use the long mounting screws supplied with the dilution
probe to connect the mounting bracket to the 2020
bottom housing. See
Figure 21 .
3. Use the short mounting screws and the washers to
connect the dilution probe to the mounting bracket.
Dilution Probe
Mou nting B ra cket
B ottom Housin g
L ong
Mo unting Screw
Short
Mou nting Screw
Wa sher
Dilution Probe
Figure 21 Installing the Dilution Probe
Calibration with the Dilution Probe
2020 must be calibrated in order to display concentration in units
equivalent to ppm.
Occasionally clean ambient air will be suitable as zero air. If there is
any doubt, use a commercial source of zero grade air and a
regulator or second sampling bag. Span gas of the desired compound
and concentration is also required and may be obtained from a
specialty gas supplier. See
Calibration Gas Supplier on page 167.
Isobutylene at 100 ppm in air is recommended as span gas (Part No.
MX350012). If you are using another type of span gas, you must
obtain the required gas and concentration. If compound threshold