LSI LASTEM DPA154 User manual

Environmental monitoring solutions
Pyranometers
Class B, C
User manual

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 2 / 17
Revisions list
Issue
Date
Author
Description of changes
Origin
26/01/2021
G. Certo, S. Reschiotto
About this manual
The information contained in this manual may be changed without prior notification. No part of this manual
may be reproduced, neither electronically nor mechanically, under any circumstance, without the prior
written permission of LSI LASTEM.
LSI LASTEM reserves the right to carry out changes to this product without timely updating of this document.
Copyright 2020-2021 LSI LASTEM. All rights reserved.

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 3 / 17
Summary
1 Introduction................................................................................................................................................4
2 Technical features ......................................................................................................................................5
2.1 Class B Pyranometer.......................................................................................................................... 5
2.2 Class C Pyranometer.......................................................................................................................... 7
3 Calibration ..................................................................................................................................................9
4 Product installation ..................................................................................................................................11
4.1 General safety rules......................................................................................................................... 11
4.2 Mechanical installation.................................................................................................................... 11
4.3 Electrical connection ....................................................................................................................... 12
4.4 LSI LASTEM data logger configuration............................................................................................. 13
5 Operation check .......................................................................................................................................14
6 Maintenance.............................................................................................................................................15
7 Spare parts................................................................................................................................................15
8 Disposal ....................................................................................................................................................15
9 How to contact LSI LASTEM......................................................................................................................16
10 CE Conformity Declaration.......................................................................................................................17

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 4 / 17
1Introduction
The LSI LASTEM pyranometer is an instrument to measure the solar irradiance (direct and diffuse) which
reaches the terrestrial surface.
With this instrument it is possible to measure not only the global radiation (see WMO n°8 7th ed.), but also
the reflected sun radiation (albedometer) and the diffuse radiation by means of the occultation band.
The pyranometer measures radiation values within 300 and 3000 nm, with a visibility of 2π steradians. The
element used to for the measurement is a thermopile whose external surface has been darkened with matt
black paint bearing a reflecting power < than 2% (e>0.98) in the spectral area of the sensor.
The following table compares the specifications required for the pyranometers in “first class” or “second
class” (ISO 9060) or in “good quality” (WMO n°8, 7th ed.) and the Lsi Lastem pyranometers.
ISO 9060
C
standard
B
class
B class
Lsi Lastem
C
class
C class
Lsi Lastem
1
Response time (95%)
< 15 s
< 30 s
16 s
< 60 s
20 s
2
Zero offset:
(a) Net thermal radiation response of
200
(b) Response to variation of 5 Kh-1
7 Wm-2
2 Wm-2
15 Wm-2
4 Wm-2
12 Wm-2
2 Wm-2
30 Wm-2
8 Wm-2
14 Wm-2
3 Wm-2
3
Stability (drift/year)
0.8 %
1.5 %
< 1 %
3 %
< 1.5 %
4
Non-linearity
0.5 %
1 %
0.75 %
3 %
1.5 %
5
Directional response
10 Wm-2
20 Wm-2
20 Wm-2
30 Wm-2
30 Wm-2
6
Sensitivity/year variation
2 %
5 %
< 2 %
10 %
< 2 %
7
Temperature response
2 %
4 %
< 4 %
8 %
< 7 %
8
Tilt response
0.5 %
2 %
-
5 %
-
WMO n° 8, 7aed., Pyranometer table 7.5
9
Total uncertainty:
-Hourly total
-Daily total
3 %
2 %
8 %
5 %
< 8%
< 5 %
20 %
10 %
< 20 %
< 10 %
1) Response time of the pyranometer to reach 95% of the final value in case of a rapid change in Irradiance;
2a) Pyranometer offset signal not generated by the sun, but in the conditions of night sky at -10 ° C and +30°C
sensor body temperature
2b) Offset signal of the pyranometer not generated by the sun, but by an ambient temperature change of 5 ° C in 1
hour;
3) Change in sensitivity over a year;
4) Non-linearity of the sensitivity value in the range from 100 to 1000 W / m2;
5) Error of the angular response when the pyranometer is hit by a perpendicular radiation of 1000 W / m2
compared to when it is inclined. The cosine of the angle with respect to the zenith of the location must be
taken into account.
6) Spectral sensitivity deviation from the ideal value of the product between the absorption coefficient and
transmission of the glass compared to the average value between 200 and 3000 nm.
7) Change in sensor sensitivity due to a rapid temperature change within a range of 50 degrees Celsius.
8) Variation of the sensitivity of the horizontal sensor when it is hit by a perpendicular irradiance of 1000 W / m2
compared to when it is rotated by 90 °. This is the sensitivity variation only due to mechanical inclination.
9) Acceptable uncertainty of the measurement of total solar energy received in an hour or per day in Wh / m2 or
MJ / m2. The reference value is the measurement made with another instrument with higher class.

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 5 / 17
2Technical features
2.1 Class B Pyranometer
PN
DPA154
DPA855
DPA980
Output
µV
4÷20 mA
RS485-Modbus
Protocol
-
-
Modbus RTU®, TTY-ASCII
Programmable output
-
-
Inst, max/min/ave
(1÷3600 sec)
RS485 protection
-
-
Galvanic insulation
(3 kV, UL1577)
RS485 speed
-
-
1200÷115 kbps
Power supply
-
10÷30 Vac/dc
10÷30 Vac/dc
Max. Load
-
300 Ohm
300 Ohm
Power consumption
-
0,5 W
0,5 W
EMC
-
EN 61326-1: 2013
EN 61326-1: 2013
Sensitivity
10÷15 µV/W/m2
NA
NA
Measuring range
0÷4000 W/m2
0÷1500 W/m2
0÷1500 W/m2
Cable
L=10 m included
Not included
(see Accessories)
Not included
(see Accessories)
Data logger
compatibility
•M-Log (ELO008)
•Alpha-Log (using ALIEM
module)
•E-Log
•M-Log (ELO008)
•Alpha-Log (using ALIEM
module)
•E-Log
•M-Log (ELO008) using
RS485->232 converter
•Alpha-Log
•E-Log using RS485->232
converter

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 6 / 17
Class B
Pyranometer
ISO 9060 2018 Classification
Spectrally flat Class B (First Class)
IEC 61724-1:2017 Classification
Class B
WMO performance level
Good Quality Pyranometer
Estimate of the achievable accuracy for
daily WMO sums
±5%
Spectral range
285÷3000 nm
Instability
<± 1% (difference per year)
Response time
16 s
Non linearity
<± 1% (100÷1000 W/m2)
Directional response
<±20 W/m2
Temperature response
<± 4% (-10÷40°C)
Irradiance range
0÷4000 W/m2
Zero offset (response to a net thermal
radiation of 200W/m2)
<12W/ m2
Zero offset b (response to a 5K/h of
thermal change)
<±3 W/m2
Supplied with each sensor
Calibration certificate
Operative temperature
-40÷80°C
Calibration traceability
WRR
Housing
Anodized aluminium
General information
Ricalibration
Every 2 years
Mounting (pole Ø 45÷65 mm)
Using DYA034 (horizontal) or
DYA035 (tilting) arm + DYA049 collar
Protection
IP66

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 7 / 17
2.2 Class C Pyranometer
PN
DPA053
DPA863
DPA983
Output
µV
4÷20 mA
RS485-Modbus
Protocol
-
-
Modbus RTU®, TTY-ASCII
Programmable output
-
-
Inst., max., min., ave.
(1÷3600 s)
RS485 protection
-
-
Galvanic insulation
(3 kV, UL1577)
RS485 speed
-
-
1200÷115 kbps
Power supply
-
10÷30 Vac/dc
10÷30 Vac/dc
Power consumption
-
0.5 W
0.5 W
EMC
-
EN 61326-1: 2013
EN 61326-1: 2013
Sensitivity
10÷15 µV/W/m2
NA
NA
Measuring range
Vedi campo di irradianza
0÷1500 W/m2
0÷1500 W/m2
Cable
Included L = 5 m
Not included
(see accessories)
Not included
(see accessories)
Mounting
DYA032 arm + DYA049
collar (horizontal)
DYA048 plate + DYA035
(tilting) arm + DYA049 collar
DYA034 (horizontal) or
DYA035 (tilting) arms +
DYA049 collar
DYA034 (horizontal) or
DYA035 (tilting) arms +
DYA049 collar
Data logger
compatibility
•M-Log (ELO008)
•Alpha-Log (with ALIEM
module)
•E-Log
•M-Log (ELO008)
•Alpha-Log (with ALIEM
module)
•E-Log
•M-Log (ELO008) with
RS485->232 converter
•Alpha-Log
•E-Log. with RS485->232
converter

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 8 / 17
Class C
Pyranometer
ISO 9060 2018 Classification
Class C (Second Class)
EC 61724-1: 2017 Classification
Class C
WMO performance level
Moderate Quality
Estimate of the achievable accuracy for
daily WMO sums
±10%
Spectral range
285÷3000 nm
Temperature response
<± 0,7% (-10÷40°C)
Irradiance range
0÷2000 W/m2
Ricalibration
Every 2 years
Operative temperature
-40÷80°C
Calibration traceability
WRR
General
Material
Anodized aluminium
Protection
IP66
Total (sensor + glass dome) relative spectral response
Relative spectral response
0
0,2
0,4
0,6
0,8
1
1,2
0
500
1000
1500
2000
2500
3000
3500
nm

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 9 / 17
3Calibration
Each pyranometer is supplied with a Calibration Report produced by comparison, under the sun or under a
lamp (ISO 9847), with a pyranometer calibrated at the WRC-PMOD in Davos (WRC: World Radiation Center;
PMOD: Phisikalisch Meteorologisches Observatorium Davos).
The Calibration Report contains the Calibration Factor whit its expanded uncertainty.
An overall accuracy value is not supplied; there are however many available features according to the classes
of the WMO n°8 and ISO 9060. Besides, the accuracy, each sensor is influenced by the quick temperature
changes due to the quick movements of clouds and rain conditions.
It is not necessary to re-calibrate the instrument frequently. It is advisable to re-calibrate the instrument
every 2 to 3 years in order to keep calibration uncertainty variations in the range of the pyranometer class.

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 10 / 17
Measures example:
Typical mean values of Daily totals of energy (MJ/m2)of global radiation in three North Italy town during an
year.
Locality
jan
feb
mar
apr
may
jun
jul
aug
sep
oct
nov
dec
Turin
5.0
8.1
13.3
17.1
20.0
22.4
22.2
18.8
14.1
9.8
6.1
4.4
Aosta
3.6
6.2
11.8
16.0
19.4
21.8
21.5
18.2
13.6
9.4
5.4
3.6
Milan
5.2
8.1
13.6
17.3
20.4
22.6
22.7
19.3
14.3
9.6
5.9
4.3