LPPYRA13
- 16 -
V2.3
5
MEASUREMENT IN THE MODELS WITH ANALOG OUTPUT
Below are the ways to calculate the global irradiance in the models with analog output
LPPYRA13, LPPYRA13AC and LPPYRA13AV.
5.1
LPPYRA13
Each pyranometer is distinguished by its own sensitivity (or calibration factor) S ex-
pressed in µV/(Wm
-2
) and shown in the label on the pyranometer (and in the calibra-
tion report).
The irradiance E
e
is obtained by measuring with a multimeter the difference of potential
DDP at the ends of the sensor and applying the following formula:
E
e
= DDP / S
where:
E
e
is the irradiance expressed in W/m
2
;
DDP is the difference of potential expressed in
µ
V measured by the multimeter;
S is the sensitivity of the pyranometer expressed in µV/(Wm
-2
).
5.2
LPPYRA13AC
The 4…20 mA output signal corresponds to the 0…2000 W/m
2
(0…4000 W/m
2
– order-
ing code LPPYRA13AC4) irradiance range.
The irradiance E
e
is obtained by measuring with a multimeter the current I
out
absorbed
by the sensor and applying the following formula:
E
e
= 125
•
(I
out
- 4) if f.s.= 2000 W/m
2
E
e
= 250
•
(I
out
- 4) if f.s.= 4000 W/m
2
where:
E
e
is the irradiance expressed in W/m
2
;
I
out
is the current expressed in mA absorbed by the pyranometer.
5.3
LPPYRA13AV
The output signal (0…1 V, 0…5 V or 0…10 V depending on the version) corresponds to
the 0…2000 W/m
2
(0…4000 W/m
2
- ordering code LPPYRA13AV4) irradiance range.
The irradiance E
e
is obtained by measuring with a multimeter the output voltage V
out
of
the sensor and applying the following formula:
E
e
= 2000
•
V
out
for the version 0…1 V with f.s.= 2000 W/m
2
E
e
= 4000
•
V
out
for the version 0…1 V with f.s.= 4000 W/m
2
E
e
= 400
•
V
out
for the version 0…5 V with f.s.= 2000 W/m
2
E
e
= 800
•
V
out
for the version 0…5 V with f.s.= 4000 W/m
2
E
e
= 200
•
V
out
for the version 0…10 V with f.s.= 2000 W/m
2
E
e
= 400
•
V
out
for the version 0…10 V with f.s.= 4000 W/m
2
where:
E
e
is the irradiance expressed in W/m
2
;
V
out
is the output voltage expressed in V measured by the multimeter.
Summary of Contents for Delta OHM LPPYRA13
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