Page 14
BAM 1020-9805 Manual Rev A.docx
10.
Inlet Separator Heads:
For PM
10
monitoring, the BX-802 Size-Selective Inlet is installed
directly onto the inlet tube with no cyclone. To configure the BAM 1020 for PM
2.5
monitoring,
install the PM
2.5
size fractionator below the PM
10
head as shown below. Use O-ring lubricant
as needed. Met One Instruments offers a variety of PM
2.5
fractionators for use with the BAM
1020.
11.
Inlet Tube Grounding:
The two ¼”-20 set screws located in the inlet receiver of the BAM
should create a ground connection for the inlet tube to prevent static electricity from building up
on the inlet tube under certain atmospheric conditions. This is also important in areas near
electromagnetic fields, high voltage power lines, or RF antennas. Check the connection by
scraping away a small spot of the clear anodizing near the bottom of the inlet tube and use a
multimeter to measure the resistance between this spot and the “CHASSIS” ground connection
on the back of the BAM 1020. It should measure only a couple of Ohms or less if a good
connection is made with the set screws. If not, remove the set screws and run a ¼-20 tap
through the holes. Then reinstall the screws and check the electrical resistance again.
Note:
Anodized aluminum surfaces are non-conductive.
12.
Pump Location and Installation:
The best location for the vacuum pump is often on the floor
under the rack or bench, but it may be located up to 25 feet away if desired. It may be
preferable to locate the pump so that noise is minimized if the BAM 1020 is in an area where
personnel are present. If the pump is to be enclosed, ensure that it will not overheat. The Gast
pumps have a thermal shutdown inside which may trip if overheating occurs. Route the clear
10 mm air tubing from the pump to the back of the BAM 1020, and insert it firmly into the
compression fittings on both ends. The tubing should be cut to the proper length and the
excess tubing saved.
The pump is supplied with a 2-conductor signal cable which the BAM 1020 uses to turn the
pump on and off. Connect this cable to the terminals on the back of the BAM 1020 marked
“CONTROL.” The end of the cable with the black ferrite filter goes toward the BAM. Connect
the Black wire to the “Pump Black” terminal and the Red wire to the “Pump Red” terminal.
Connect the other end of the cable to the two terminals on the pump.
There are two pump types available for the BAM 1020. The Gast rotary vane pumps are louder
and draw considerably more power than the Medo linear piston pumps, but have better
vacuum capacity, especially at higher altitude or in 50 Hz applications. The Medo pumps are
smaller, quieter, and more efficient, but aren’t recommended for 50 Hz use.
13.
Optional Connections:
Newer data loggers often interface to the BAM 1020 using the digital
serial ports for better accuracy. Information about this is also found in Section 7. Met One can
also supply additional technical bulletins on the subject.
The BAM 1020 has a variety of other connections: Alarm relay, analog outputs, Ethernet and
serial port connections located on the back as shown in Figure 2-4 below . These items are
described in Section 7 of this manual.
Содержание BAM-1020
Страница 15: ...BAM 1020 9805 Manual Rev A docx Page 15 Figure 2 1 Typical BAM 1020 Installation in a Walk in Shelter ...
Страница 16: ...Page 16 BAM 1020 9805 Manual Rev A docx Figure 2 2 Typical BAM 1020 Installation in a BX 902 Mini Enclosure ...
Страница 17: ...BAM 1020 9805 Manual Rev A docx Page 17 Figure 2 3 BAM 1020 Mounting Dimensions ...
Страница 18: ...Page 18 BAM 1020 9805 Manual Rev A docx Figure 2 4 BAM 1020 Rear Panel Connections ...
