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
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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
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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
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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
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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

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 11 / 17
4Installation
The pyranometers must be exposed towards the equator in a place that, in every season, is free of shadows
during the day and installed at a height of 2 m on grassy places.
4.1 General safety rules
Please read the following general safety rules in order to avoid injuries to people and prevent damages to
the product or to possible other products connected with it. In order to avoid any damages, use this product
exclusively according to the instructions herein contained.
The installation and maintenance procedures must be carried-out only by authorized and skilled service
personnel.
Power the instrument in a suitable manner. Pay attention and observe the power supplies like indicated for
the model in your possession.
Carry-out all connections in a suitable manner. Pay strict attention to the connection diagrams supplied with
the instrument.
Do not use the product in case of suspected malfunctions. In case of suspected malfunction, do not power
the instrument and contact authorized technical support immediately.
Before you carry-out any operation on electrical connections, power supply system, sensors and
communication apparatus:
•Disconnect the power supply.
•Discharge the accumulated electrostatic discharges touching an earthed conductor or apparatus.
4.2 Mechanical installation
The pyranometer must face equator and be exposed in a place with no shades throughout the day in every
season; best installed at a height of 2 m on grassy ground. Do the Installation on pole using a DYA049 collar
and DYA032-034-035 support. Follow these steps (the example in the figures show sensor in which the
DYA049 collar and the DYA034 support is used):
1. Remove the radiant protective screen from the
pyranometer body.
2. Fix the DYA032-034-035 support
the DYA049 collar and mount them
on pole.
3. Turn the support until the sensor
points to the terrestrial equator.

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 12 / 17
4. Mount the body of the
sensor on the DYA032-
34-035 support, having
care to level the sensor
horizontally using the
two leveling feet and
the bubble level.
5. Fix the pyranometer
to the supporting disc
using the two longest
screws; use an Allen
wrench n° 4 for this
purpose.
6. Reassemble the protective
screen on the pyranometer
body.
4.3 Electrical connection
Connections must be performed following the drawing of the pyranometer:
PN
Wire color
Nome
Significato
DPA053
DPA154
Brown
+ output
Thermopile output +
Blue
- output
Thermopile output -
Schield
Gnd
Ground
PN
Wire color
Nome
Significato
DPA855
DPA863
Red
Power In +
Power supply +
Blue
Power In -
Power supply -
Schield
Gnd
Ground
Green
Output -
- 4÷20 mA
Brown
Output +
+ 4÷20 mA
PN
Wire color
Nome
Significato
DPA980
DPA983
Red
Power In
Power, Vdc or Vac
Blue
Power In
Power, Vdc or Vac
Shield
Gnd
Earthing
Green
RS-485 D+
Serial Line - positive RS-485 (non-inverting signal)
Brown
RS-485 D-
Serial Line - negative RS-485 (inverting signal)

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
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4.4 LSI LASTEM data logger configuration
If the pyranometer is used with an LSI LASTEM data logger, proceed with the configuration of the data logger
using the 3DOM software:
➢Open the data logger configuration
➢Add the sensor by selecting its code (eg DPA154) from the 3DOM Sensor Library.
➢If the sensor has a voltage output (direct thermopile output), replace the default value of the Positive
signal C.F. with Calibration factor value found on the Calibration certificate supplied with the sensor.
Below is the window for setting the parameters of the ALIEM data logger.
➢Check the acquition parameters (input, rate, etc.)
➢Save the configuration and send it to the data logger.
For more information about the configuration, refer to the manual of the data logger in use.

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
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5Operational check
To check the sensor output it is necessary to have the accompanying drawing (DISACC) of the sensor and a
multimeter.
Identify the sensor output: current (4÷20 mA) or voltage (thermopile). Proceed as follows:
➢For sensors with direct voltage output signal (µV):
1. Set the multimeter to measure voltage signals and scale in µV.
2. Connect the red test lead (+) of the multimeter to the wire corresponding to the positive
signal (+ Sig) and the black test lead (-) to the negative signal wire (- Sig) of the sensor (it is
not necessary to disconnect the sensor from the data logger.)
3. Darken the sensor with a black cloth; the multimeter should measure around 0 µV.
4. With the sensor exposed to the sun the multimeter should measure a value greater than 0
µV.
➢For sensors with 4÷20 mA current output signal:
1. Set the multimeter to measure signals in direct current (DC) and 20 mA scale.
2. Disconnect the wire corresponding to the negative signal (- Sig) and connect it to the red test
lead (+) of the multimeter. The black test lead (-) fix it in place of the disconnected wire.
3. Darken the sensor with a black cloth; the multimeter should measure approximately 4 mA.
4. With the sensor exposed to the sun the multimeter should measure a value greater than 4
mA.
Verification of the digital output (RS485) can be done using a PC, equipped with an RS232 serial
port and in which the third-party program, example modpoll.exe
(https://www.modbusdriver.com/modpoll.html) is installed.
1. Connect the sensor serial cable to the PC serial port.
2. Open a DOS Prompt window and type the following command (it is assumed that the transmission
parameters are set as follows: Baudrate: 9600 bps, Parity: None and that the PC serial port used is
COM1):
modpoll -a 1 -r 1 -c 4 -t 3:float -p none -b 9600 -p none com1 [Enter]
For the list of available commands, type the command modpoll /help.
3. With the rotor stopped you should read 0 as the first value displayed by the program.
4. With the rotor moving, a value greater than 0 should be read as the first value displayed by the
program.
For more information on versions with digital output, refer too INSTUM_01242 –DPA870/873 Modbus
pyranometer- User manual.
The radiation value read can be compared with other radiometers installed in the same system as long as
they are of the same type and have the same Azimuth.

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 15 / 17
6Maintenance
The pyranometer does not require special maintenance, just cleaning. It is also advisable to check:
➢the status of the external dome in the winter months, when an icy layer may form on it
➢the status of the silica salt every 3-6 months depending on humidity of the site
➢that the sensor is leveled.
For recalibration, refer to chap. 3.
7Spare parts
Code
Descrizione
DYA032
Horizontal arm for fixing DPA053-053.1 to DYA049 collar
DYA034
Horizontal arm for fixing DPA863-873 to DYA049 collar
DYA035
Tilting arm for fixing DPA863-873 to DYA049 collar
DYA049
Collar for fixing DYA032-034-035 to ø 45-65 mm pipe
DWA410
Cable for DPA154-855-870-863-873 L = 10 m
DWA425
Cable for DPA154-855-870-863-873 L = 25 m
DWA426
Cable for DPA154-855-870-863-873 L = 50 m
DWA427
Cable for DPA154-855-870-863-873 L = 100 m
DYA048
Plate for levelling DPA053 on DYA034-035 arm
DYA120
Radiant shield for DPA053
DEA420.1/2
Signal amplifier for Pyranometers. Output: 4÷20 mA. Programmable pyranometer
sensitivity (µV/Wm2). Power supply 10÷30 Vac/dc
MDMMA1010.1
Same features as DEA420 but with Modbus-RTU output
MC4390
Container with silica salt
MC1175
External white screen
8Disposal
This product is a device with high electronic content. In accordance with the standards of environmental
protection and collection, LSI LASTEM recommends handling the product as waste of electrical and electronic
equipment (RAEE). Forthis reason, at the end of its life, the instrument must be kept apart from other wastes.
LSI LASTEM is liable for the compliance of the production, sales and disposal lines of this
product, safeguarding the rights of the consumer. Unauthorized disposal of this product will
be punished by the law.

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 16 / 17
9How to contact LSI LASTEM
In case of problem contact the technical support of LSI LASTEM sending an e-mail to [e-mail],
or compiling the technical support request module at www.lsi-lastem.com.
For further information refer to addresses and numbers below:
•Phone number +39 02 95.414.1 (switchboard)
•Address: Via ex S.P. 161 –Dosso n. 9 - 20049 Settala Premenugo, Milano
•Web site: www.lsi-lastem.com
•Commercial service: [e-mail]
•After-sales service: [email protected]om, Repairs: [e-mail]

First & Second class Pyranometers –User manual
LSI LASTEM SRL
INSTUM_01388
Pag. 17 / 17
10 CE Conformity Declaration
Descrizione del Prodotto: Piranometro con uscita normalizzata
Modelli: DPA855, DPA863, DPA980, DPA983
Pyranometri First Class ISO9060
DPA855
Sensore/Piranometro/First Class/4÷20mA/ 10÷30V
DPA980
Sensore/Piranometro/First Class/RS485/10÷30V
Pyranometri Second Class ISO9060
DPA863
Sensore/Piranometro/Second Class/4÷20mA/10÷30V
DPA983
Sensore/Piranometro/Second Class/RS485/ 10÷30V
Produttore: LSI LASTEM Srl
LSI Lastem Srl dichiara sotto la propria responsabilità che i suddetti dispositivi sono prodotti in conformità
alle direttive EMC 89/336 EEC (included EEC 93/68):
•EN 50082-1
•EN 55011
•EN 55022 (CISPR 22) –Electromagnetic interference
•EN55024 (IEC61000-4-2,3,4,5,6,8,11) –Electromagnetic immunity
•EN 61000-3-2 (IEC610000-3-2) –Power line harmonics
•EN 61000-3-3 (IEC610000) –Power line flicker
•EN 60950 (IEC60950) –Product safety
Settala, 18 Ottobre 2013 Luca Lesi