— PRELIMINARY —
Gilian
®
GILAIR-3 & GILAIR-5 AIR SAMPLING SYSTEMS
22
Sensidyne Document No. 800880M (Rev E)
3.2
MULTI-FLOW OPERATION
3.2.1
Multi-Flow Module
The multi-flow module is suitable for multiple tube
sampling between 1 and 750 cc/min and can be used
in conjunction with the Gilian Universal Tube Holder
System to perform multiple tube sampling. The
module’s internal regulator maintains a constant pres-
sure of approximately 18” H
2
O at the sampler’s inlet
while allowing changes in total flow through the sys-
tem. With a constant pressure in the tube holder mani-
fold, the flow through each tube can be set indepen-
dently without affecting the flow(s) through the adja-
cent tube(s). Total sampling tube combined flows can-
not exceed 750 cc/min.
The multi-flow module is installed in the same manner
as the Constant Flow Module. Once installed, set the
module’s On/Off switch to the Off position and adjust
the sampler’s flow to between 1 and 1.5 LPM. Set the
module On/Off control to the On position. Perfor-
mance should be checked in conjunction with the test
set-up. With the load valve closed, the pressure should
be 18”
±
3” H
2
O. Open the load valve until the flow is
approximately 750 cc/min. The pressure should not
vary more than
±
3” H
2
O.
Once the system’s performance has been checked, the
Tube Holder System can be connected. Fit each sor-
bent tube to an appropriately sized Tube Holder and
connect the outlet of the Manifold to the inlet of the
sample. Set the flow through each tube by adjusting the
corresponding flow control valve in the Manifold. The
flow through each tube should be measured with a
calibrated device connected to the inlet of that tube
holder. A Gilibrator 2 or conventional bubble flow
meter is preferable since the pressure drop through this
type of device is negligible.
3.2.2
Bag Sampling
A unique multi-flow bag sampling capability is avail-
able in the latest version of the multi-flow module. Ac-
cess to the pressure port is by means of an internal luer
taper on top of the module. One or more bags may be
filled by installing the luer fitting into the luer taper re-
ceptacle located on top of the module and connecting
a 1/4” tubing from the opposite end of the luer fitting
(luer taper from 1/8” ID tubing) to the flow manifold.
Flow is adjusted by means of the flow control valve in
the manifold. Connection to the bag is made by screw-
ing the end fittings to the tubing housing such that the
O-rings located on the shoulder of the fitting seals
against the tube housing. An additional piece of 1/8” ID
tubing is secured to the special fitting on the manifold
which is then directed to the bag. Flow can be set via
a Gilibrator 2 or flow meter by adjusting the screw
within the specific tube housing associated with the
flow control valve so as to obtain the flow required.
Remove the calibration equipment and connect the
tubing to the bag to be filled.
Summary of Contents for GILAIR-3
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