Delta OHM HD2302.0, Manual, Page: 24 / 32

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Measurement probe LP 471 ERY of TOTAL EFFECTIVE IRRADIANCE (W
eff
/m
2
)
weighted according to the UV action curve (CEI EN 60335-2-27) complete with SICRAM
module and equipped with the instrument
Measurement range (W
eff
/m
2
):
0.1 10
-3 … 999.9 10 -3
1.000…19.999 20.00…199.99 200.0…1999.9
Resolution (W
eff
/m
2
): 0.1 10
-3
0.001 0.01 0.1
Spectral range:
UV action curve for erythema measurement (250 nm…400 nm)
Calibration uncertainty: <15%
f
3
(linearity): <3%
f
4
(instrument reading error):
1digit
f
5
(fatigue): <0.5%
Drift after 1 year: <2%
Working temperature:
0…50 C
Reference Standard CEI EN 60335-2-27
Typical response curve
The LP 471 ERY probe measures the total effective irradiance (W
eff
/m
2
) weighted according to the
UV action curve (CEI EN 60335-2-27). The particular photodiode and a proper combination of fil-
ters, brings the probe's spectral curve close to the UV action curve.
The CEI EN 60335-2-27 norm prescribes that, during the first tanning treatment, the dosage of 100
J/m
2
cannot be exceeded, and that the maximum yearly dosage must not exceed 15000 J/m
2
.
The typical spectral curve of the LP 471 ERY probe is illustrated in the figure together with the UV
action curve: the agreement between the two curves mean reliable measurements are obtained using
the different types of lamps (and filters) used by the tanning machines currently on the market.
All probes are individually calibrated in the DeltaOhm photo-radiometry laboratory, using a dual-
beam monochromator.
The calibration is performed at 295nm, using a calibrated photodiode as
reference.
0.00001
0.0001
0.001
0.01
0.1
1
10
250 270 290 310 330 350 370 390
Lambda (nm)
Re
la
tiv
e
sp
ec
tra
l r
es
po
ns
e
Continuous line = UV action curve
Dotted line = Spectral sensitivity of LP471 ERY