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1 Introduction
ECO 9099 SOP05-5090F Rev.00 Effective Date: 12/20/18 Page 40 of 58
1.4. Fluidic Modules
1.4.1. Standard A
Standard A, STD A, is drawn to the electrode module by a vacuum provided by the peristaltic
pump. When STD A is to be aspirated into the electrode module, solenoid valve A is opened and
solenoid valves B, C, V and R are closed.
STD A is drawn from the Fluid Pack, to the fill port, through the sample probe up to the sample
sensor. When the sample sensor detects fluid, solenoid valve V is opened and solenoid valve A is
closed. The peristaltic pump continues to pump STD A into the electrode module. At the trailing
edge of the STD A is air.
When the sample sensor detects air, the peristaltic pump stops. Standard A should fill the
electrode module. During the time STD A is aspirated into the electrode module, the reference
housing is pressurized due to the peristaltic pump providing pressure to the reference solution
line and solenoid valve R being closed. A small amount of reference solution is forced out through
the reference junction to provide contact to the sample.
Once measurement is complete, the peristaltic pump moves the fluid back to the Fluid Pack into
the Waste Container.
1.4.2. Standard B and C
The process for STD B and STD C is identical to that of STD A with the exception of the
operation of solenoid valves B and C. These solenoid valves are operated in reverse order of
STD A aspiration.
1.4.3. Reference Solution
The reference solution is circulated back into the Reference Solution container in the Fluid Pack.
The reference housing has an in and an out port. It is filled automatically using the second
winding of the peristaltic pump and solenoid valve R. The reference solution connector allows for
the reference housing tubing to be plugged into the reference solution circuit. As the peristaltic
pump aspirates reference solution, solenoid valve R is opened to allow excess solution to be
pumped into the reference return line of the Fluid Pack.
1.4.4. Waste Liquids
Calibration standards and sample waste are all pumped out of the left side of the electrode tray
(green-banded tubing) through the peristaltic pump to the waste line and into the waste bag of the
Fluid Pack. The Waste Container has an internal one-way valve is incorporated to prevent waste
material from leaking out of the Fluid Pack.
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