2.2 Reader Components
Chapter 2 System Description
8
pH SAFE Reader Operator Manual - Doc. No. 120001-09
pH SAFE Reader
Model: BCSI pH1000
To measure pH, the
Fiber Optic
Probe
of the
pH SAFE Reader
is inserted
into the pH SAFE Sensor
of the BCSI platelet storage bag. When directed by the
user, the Fiber Optic Probe delivers flashes of green light from a monochromatic
light source to the bag to excite and induce fluorescent light emission from the
dye in the membrane. When excited to fluorescence the dye produces a
characteristic wavelength spectrum of emission light. At one wavelength (600nm,
Fp), the intensity of light emission is
variable and dependent upon the pH of the
fluid in the bag. At a second reference wavelength (568nm Fr), the relative
emission intensity is constant regardless of the pH of the fluid in the bag.
The intensities of the two wavelengths of interest are collected by photodetectors
in the
pH SAFE Reader
. A ratio of the two wavelengths is calculated and
converted into a pH. By using a ratio of the emission intensities, the pH can be
determined independent of factors such as excitation intensity, optical
transmission quality, or dye concentration. If either the intensity measurement or
the calculated ratio value fall outside acceptable ranges, an alarm message is
displayed on the instrument screen and the pH result value for this bag is not
stored.
2.2
Reader Components
Figure 2-2
pH SAFE Reader Components
The
pH SAFE Reader
consists of the following components:
•
pH SAFE Reader
(Model: BCSI pH1000), power adapter (GlobTek, GT-
41052-1509), Ethernet cable, RS-232 Serial cable
•
Bar Code Scanner
•
Printer, power adapter, RS-232 Serial adapter (optional)
These individual components are described next.
Probe
pH SAFE Reader
RS-232
Model: BCSI pH1000
Fiber Optic
Power Adapter
Instrument
Printer
Bar Code Scanner
Power Adapter
Printer
Cable
Summary of Contents for pH SAFE PH1000
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