Download Sample Path Air Flow Kit _2_14 - LI

Air Pumps and Accessories for LI-COR Gas Analyzers
Suggested Parts and Vendors
The sample cells of LI-COR closed-path gas analyzers, such as the LI-800/820/840 series,
LI-6251/52/62 series, and the LI-7000, must be continually flushed while making measurements. The system time constant (T), a measure of how quickly the system responds, is
determined by the cell volume (mL) and flow rate (mL/s) through the cells:
Pump Plumbing Options - Two Examples
volume of incoming air, less prone
#1 Larger
to leaks due to positive pressure
The list of parts on the next page can be used to make a simple air flow system to move
sample air streams through these analyzers. Parts available for sale through LI-COR are
listed, as well as alternative vendors. Please contact LI-COR for pricing of LI-COR parts.
Please note the following precautions when designing your air flow system:
µP
a rt
analyzer. Failure to do this will lead to contamination of the optical path.
●
Pressures of 15 kPa or more above ambient can cause damage to the source and detector
windows. The safest mode of operation is to pull air through the optical bench.
●
Devices such as valve-actuated rotameters and T-fittings can be used to reduce flow
rates. See parts listed in this document. Voltage regulators can also be used to reduce
flow rates delivered from DC pumps.
For the LI-800/820/840/840A, the Diaphragm Pump (p/n 286-04198) can be used as shown
in the Pump Plumbing Options diagrams at right to restrict its output flow rate to less than 1
liter/min. Alternatively, applying 3 VDC to the Diaphragm Pump (286-10198) reduces the
flow rate to about 1 liter/min. For the LI-6251/6252/6262 and the LI-7000, either Diaphragm Pump (286-04198 or 286-10198) can be used directly without any flow splitting to
reduce the flow rate. Similarly, if you are able to locate a pump that delivers less than 1 liter/
minute, it can be used directly with the LI-800/820/840/840A analyzers without the need for
a flow split. LI-COR does not offer DC power supplies or voltage regulators for use with
these pumps. Other recommended suppliers are listed on the next page.
#9
Filter - Gelman
or Balston
Always install an external air filter into the sample air stream before it enters the
LI-840/A
LI-820
IN
IN
●
IN
1µ
mP
T FE
T = Cell Volume/Flow Rate
967-008
Diaphragm
Pump
Flow Meter
(set to 1 LPM)
Sample Air
Quick Connect
1/4" O.D.
Bev-A-Line
Exhaust
Quick Connect ‘L’
Quick Connect
with Regulator
Quick Connect ‘Y’
for injection measurements, smaller
#2 Use
volumes of air, more prone to leaks due
to negative pressure
IN
LI-840/A
LI-820
OUT
Air pumps, and recommended flow rates for LI-COR analyzers:
0.25
0.25
0.25
0.25
0.25
0.25
0.25
10
10
10
~50
1
1
1
Voltage Max. Flow (LPM) Type
286-04198 12 VDC
286-10198 6 VDC
3.5
1.8
Diaphragm
Diaphragm
µP
a rt
Filter - Gelman
or Balston
#9
1/4" O.D.
Bev-A-Line
IN
IN
LI-6251
LI-6252
LI-6262
LI-7000
LI-800
LI-820
LI-840/A
Part #
1µ
mP
T FE
Flow (LPM)
Model Min. Max.
Flow Meter
(set to 1 LPM)
967-008
Quick Connect
Sample Air
Quick Connect ‘L’
Open to Ambient Air
Quick Connect
with Regulator
p/n 286-04198
Quick Connect ‘Y’
Diaphragm
Pump
p/n 286-10198
Suggested Parts and Vendors
Plumbing Pieces, Filters, Scrub Tubes, Flow Meter (available from LI-COR)
8150-250
300-03123
300-03125
Bev-A-Line Tubing
1/4” OD, 1/8” ID
50 ft. Roll
Straight Union
Quick Connect
Right Angle Union
Quick Connect
300-01961
9967-008
9960-092
Balston 25 Micron Air Filter
Recommended for use with
the LI-800 and LI-820
Gelman 1 Micron Filter
Assembly
Recommended for use with
the LI-840/A, LI-6251/52/62,
and LI-7000
Short Chemical Scrub Tube
Assembly
Other Sources...
Other Sources for Tubing, Valves, and Fittings:
Camozzi: http://www.camozzi-usa.com/products/fittings/
fittings.php
Coast Pneumatics: http://www.coastpneumatics.net/
Parker: http://www.parker.com
Pneuaire: http://www.pneuaire.com/
Poweraire: http://www.poweraire.com/
Swagelok: http://www.swagelok.com
Other Sources for Air Pumps:
KNF Neuberger, Inc.
Two Black Forest Road
Trenton, NJ 08691-1810
Phone: 609-890-8600
General Inquiries (not for orders)
[email protected]
Brailsford & Co., Inc.
15 Elm Avenue
Antrim, NH 03440
Phone: 603-588-2880
[email protected]
300-03367
300-07385
Y-Union
Quick Connect
9960-093
Long Chemical Scrub Tube
Assembly
Thomas (ASF) Division - Sheboygan
1419 Illinois Ave.
Sheboygan, WI 53081
Phone: 920-457-4891
[email protected]
Please contact LI-COR if you have questions regarding your
instrument or about how to assemble an air flow system.
T-Union
Quick Connect
294-03334
Rotameter; 2.5 LPM with valve
Note: Requires (2) Hose Barb
Fittings, p/n 300-03388
300-10471
Regulator
Quick Connect
4647 Superior Street ● P.O. Box 4425 • Lincoln, Nebraska 68504
North America: 800-447-3576 ● International: 402-467-3576
[email protected] ● [email protected] • www.licor.com
Serving United States, Canada, and Mexico
LI-COR Distributor Network: www.licor.com/env/distributors
© 2014, LI-COR, Inc. LI-COR is a registered trademarks of LI-COR, Inc. All other trademarks
belong to their respective owners.
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