Arkray PU-4010 User Manual

PU-4010 1-5
1-1-3 Measurement Principle
Measurements using double or single wavelength reflection are made, using test strips
designed for the PocketChem UA.
Measuring with Test Strips
Dip a test strip in the sample for 2 seconds and place it on the test strip tray. Reagents in the
test strip react and change color within 70 seconds after dipping and the reflectance is
measured in the photometric section.
In the photometric section, LEDs shine dual-wavelength light upon the test strip and
reflections are received at the detector. Different combinations of light are applied for each
measurement item. Furthermore, photometric measurements carried out in the color tone
correction section adjust for variability in the amount of reflected light and sample coloring.
The reflectance is obtained using the following equation.
R = Tm · Cs / Ts · Cm
R: Reflectance
Tm: Amount of reflected light at the measuring wavelength at the test section (Pad area)
Ts: Amount of reflected light at the reference wavelength at the test section (Pad area)
Cm: Amount of reflected light at the measuring wavelength in the color tone correction
section
Cs: Amount of reflected light at the reference wavelength in the color tone correction
section
The BLD measurement item alone is calculated
using the following equation and single
wavelength measurement.
R = Tm / Cm
The reflectance R is compared with the
calibration curve for the instrument and is output
as the measurement result.
Additionally, in order to eliminate the influence
of ambient temperature fluctuation upon
measurements, temperature corrections are
applied as follows.
Rt = R + A · (T-26) · R
2
· (1-R)
2
Rt: Reflectance after temperature correction
A: Correction coefficient for the measurement items
T: Internal ambient temperature of the instrument during measurement
• Measurement wavelength of each
measurement item
Measurement
Item
Measurement
wavelength (nm)
Reference
wavelength (nm)
GLU 635 760
PRO 635 760
BIL 565 760
URO 565 760
PH 635 760
S.G. 635 760
BLD 635 ---
KET 565 760
NIT 565 760
LEU 565 760
ALB 565 760
CRE 635 760

Arkray PU-4010 Specifications

General

Brand	Arkray
Model	PU-4010
Category	Measuring Instruments
Language	English