RKI Instruments SDM-2009 PC Controlled Configuration - Manual (Page 18)

13 • Hardware Setup
SDM-2009 on the exhaust fitting of each SDM-2009. Route the tube to an area
where the exhaust can be safely dispersed, such as an open window. Exhaust
tubing from multiple units can be daisy chained together in a manifold for more
convenient operation. In this case, the check valves that are provided with the
docking stations need to be used. See "Assembling a Manifold for Multiple
SDM-2009 Units" below for instructions.
CAUTION: The maximum recommended length for the exhaust tube is 10 feet. Do
not use more than 10 feet of tubing or tubing with an ID of less than
5/16 inch for the exhaust tube or the bump test and calibration
accuracy will be adversely affected. The exhaust tube that is shipped
with the SDM-2009 has an ID of 5/16 inch and is 10 feet long.
7. Install the 3 foot long 3/16 inch ID tube that is included with the SDM-2009 on
the GAS fitting. GAS tubing from multiple units can be daisy chained together
in a manifold for more convenient operation. See "Assembling a Manifold for
Multiple SDM-2009 Units" below for instructions.
8. Connect the provided USB cord from the type B USB port on the back of the
SDM-2009 to an available USB port on your computer or to a USB hub that is
connected to your computer. See “USB Hub Requirements for Multiple Station
Systems” on page 11 for more information about USB hubs.
Assembling a Manifold for Multiple SDM-2009 Units
Up to 10 SDM-2009s can be manifolded together. The GAS fitting can be manifolded
to allow the stations to draw from one calibration cylinder. The exhaust lines can also
be manifolded together and be routed away from the docking stations with only one
10 foot long 5/16 inch piece of tubing.
Each SDM-2009 is shipped with exhaust tubing, GAS tubing, T-fittings in two different
sizes, and a check valve.
Exhaust Tubing
Reference Figure 12 for the instructions below.
1. Cut a 1-2” piece of 5/16 inch tubing for each SDM-2009 and connect it to each
unit’s exhaust fitting.
2. Connect the provided check valves to the short pieces of tubing already
installed at the exhaust fittings. Be sure that the arrows that appear on the
check valve are pointing away from the exhaust fitting.
3. Cut a 2-3” piece of 5/16 inch tubing for every SDM-2009 except the first one
and connect it to the other end of the check valve.
4. Insert the larger T-fittings into the tubing so that the remaining two ports on the
T-fitting are perpendicular to the exhaust tube and check valve.
5. For the first SDM-2009, cut a 9-10” piece of 5/16 inch tubing and connect it
from the check valve on the first SDM-2009 to the closest port on the second
SDM-2009’s exhaust T-fitting.