2 System Description
301-7146 English Rev B 11/02/2011 Operator’s Manual NA 23
Chapter 2 – System Description
Theory of Operation
The iChemVELOCITY is an automated urine chemistry system
performing measurements of urine physical and chemical constituents
utilizing test strips read by Wavelength Reflectance, and specific gravity
using the Refractive Index. Since the iChemVELOCITY also determines
color and clarity, a complete urinalysis is determined automatically. Visual
measurements are no longer necessary.
The iChemVELOCITY has its own power supply. A barcode reader is
used to identify specimens, control and calibration material. Motors drive
mechanical portions of the system. The instrument aspirates the sample
and sends it to the CCGM and then dispenses the sample on each pad.
The system can be linked to a Laboratory Information System (LIS).
Test strips are dispensed from the strip provider module, and placed face
up on the strip conveyer system. The sample probe mixes the specimen,
then aspirates an aliquot of urine from the tube and dispenses the sample
onto each reagent pad. The test strip reagent pads and urine
components react causing the color of the test strip to change, and the
color change is measured by the instrument. The test strip is then
transported to the waste container.
Measurements
Analytes
The Optical Unit is composed of several three color’s LEDs and one black
and white CMOS (Complementary Metal Oxide Semiconductor) camera.
See Strip Reader Module.
Endpoint reaction is used for measuring all tests.
Specific Gravity
Specific gravity of urine is obtained using an Atago refractomer and a
linear photodiode array in place of a human eye to locate the shadow.
The refractive index changes according to the specific gravity of the
sample.
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