Hitachi 902 - Page 51

2 - 39
(cont’d)
No. Data Alarm Printer S. I/F Description Remedy
Prozone error
*****P
('*****'
indicates
a
prozone
value)
P Shown below are the
expressions for calculation of
the PC value. Assuming that
the preset photometric points
are P1 and P2 and the
difference in absorbance
between two wavelengths at
photometric point P is E:
(1) In 1-point assay
PC value =Ep
2
, p
2-1
-k
Ep
2
, p
1-1
k: Liquid volume
correction factor
Note that k = 1 when
1 ≤ P1, P2 ≤ 5 or
6 ≤ P1, P2 ≤ 16 or
17 ≤ P1, P2 ≤ 33 or
34 ≤ P1, P2 ≤ 73.
Prozone check is not
carried out if P2 = 0.
(2) In 2-point assay
PC value =
Ep
Ep
P2' P3
Ep Ep
P4 P3
2 3
4 3
−
−
−
−
Note that prozone check is
not carried out if P3 = 0 or
|Ep
4
- Ep
3
| ≤ 100 × 10
- 4
Abs.
When P2' = 0, P2 is used.
In either case of (1) and (2),
prozone check is not made
for STD (1) measurement.