Sensidyne gilian gilibrator 2 Operation & Service Manual - page 12
— PRELIMINARY —
GILIAN GILIBRATOR 2 CALIBRATION SYSTEM
12
Sensidyne Document No. 850190M (Rev G)
2.3
WET CELL ASSEMBLY
The Wet Flow Cell Assembly (refer to Figure 2.4) con-
sists of a Bubble Generator and Sensor Block. Each
Bubble Generator is sized to produce a bubble film
stretched across the diameter of the flow cell tube.
The bubble is carried by airflow from the bottom to
the top of the tube. As the bubble moves past two in-
frared sensors, each sensor transmits a signal to the
Control Unit indicating the passage of the bubble film.
A manual push-button on the Flow Cell Assembly
starts the bubble film on its travel up the tube.
Wet Cell Assemblies come in three sizes and can be
used with both CE and non-CE Control Base Units:
•
Low Flow (1 to 250 ccm)
•
Standard Flow (20 ccm to 6 lpm)
•
High Flow (2 to 30 lpm)
2.3.1
Bubble Generator Components
The Bubble Generator uses a special soap solution to
generate the bubbles. This specially compounded low
residue soap is designed to provide high film strength
and compatibility with the materials used in the Flow
Cell Assembly.
WARNING
Only use Soap Solution Part No. 800450 with the Wet Cell
Assembly. Use of other soap solutions can damage the
Flow Cell.
Pulsation Damper
This built-in damper smooths out any pulsation within
the airflow and reduces oscillation of the bubble film
assuring maximum accuracy.
2.2
PISTON CELL ASSEMBLY
The Piston Cell Assembly (refer to Figure 2.2) is a
single unit that need not be disassembled and requires
very little maintenance. The assembly contains a preci-
sion cylinder-piston assembly.
A green Ready Light on the side of unit signals when
the unit is ready and sampling may begin.
A Bleeder Valve located on top of the cell assembly is
closed to provide the vacuum necessary to move the
piston up the tube.
Secured to the flow tube and secured between the up-
per and lower portions of the cell assembly, is the
Sensor Rail (refer to Figure 2.3). The Sensor Rail in-
cludes lower and upper infrared sensors used to time
the movement of the piston through the flow cell.
The movement of the piston up and down the flow
tube provides the means for calculating an accurate
flow rate. As the piston moves past two infrared sen-
sors, each sensor transmits a signal to the Control Unit
indicating the passage of the piston.
Pulsation Damper
This built-in damper smooths out any pulsation within
the airflow and reduces oscillation of the piston assur-
ing maximum accuracy.
The Piston Cell Assembly has a flow rate range from
1 to 5 LPM.
IMPORTANT NOTE
CE approved Control Unit Bases have 9-Pin cables and
CANNOT be used with Piston Cells. Non-CE Control Unit
Bases have 15-Pin cables and can be used with Piston
Cells.