4 Description of Modules
ECO 9085 SOP05-5038F Rev.05 Effective Date: 12/06/18 Page 43 of 81
4.2.
Fluid Pack
4.2.1.
Standard A
Standard A, STD A, is drawn to the electrode module by 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 as 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.
4.2.2.
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.
4.2.3.
Reference Solution
The reference solution is circulated back into 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.
4.2.4.
Waste Liquids
Calibration standards and sample waste are all pumped out of the left side of the
electrode module (green-banded tubing) through the peristaltic pump to the waste line
and waste bag of the Fluid Pack. An internal one-way valve is incorporated into the waste
bag to prevent waste products from leaking out of the Fluid Pack.
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