GHM Delta OHM PYRAsense LPS02 Series User manual

Operating manual
Pyranometers
PYRAsense
LPS02 series
www.d
eltaohm.com
English
Keep for future reference.

LPS02 - 2 - V1.0
TABLE OF CONTENTS
1 INTRODUCTION .................................................................................................... 3
2 TECHNICAL SPECIFICATIONS ...............................................................................
3 WORKING PRINCIPLE ........................................................................................... 6
INSTALLATION ..................................................................................................... 7
4.1 O PTIONAL MOUNTING SUPPORTS ............................................................................... 8
4.2 E LECTRICAL CONNECTIONS ..................................................................................... 9
5 CONFIGURATION ................................................................................................ 11
6 ASCII PROPRIETARY PROTOCOL ........................................................................ 12
7 MODBUS-RTU PROTOCOL .................................................................................... 16
8 MEASUREMENT WITH ANALOG OUTPUT (ONLY LPS03MA…) ............................... 18
9 USE OF THE DIAGNOSTIC SENSORS .................................................................... 20
10 MAINTENANCE .................................................................................................... 20
11 SAFETY INSTRUCTIONS ...................................................................................... 21
12 ACCESSORIES ORDERING CODES ....................................................................... 23

LPS02 - 3 - V1.0
1 INTRODUCTION
PYRAsense series pyr nometers me sure the global irradiance on fl t surf ce
(W/m
2
), sum of direct sol r irr di nce nd diffuse irr di nce.
The PYRAsense LPS02 series f lls within the Spectrally Flat Class B pyr nometers
ccording to the ISO 9060:2018 st nd rd nd meets the requirements of the WMO
“Guide to Instruments nd Methods of Observ tion”.
The intern l temper ture, rel tive humidity nd pressure diagnostic sensors llow
keeping the pyr nometer oper ting conditions under control ll the time nd foresee
ny m inten nce intervention in dv nce, thus ensuring lw ys reli ble me sure-
ments.
The integr ted bubble level nd the djust ble feet f cilit te horizont l positioning
during inst ll tion. As option, they c n be equipped with tilt sensor (option T in the
ordering code) which, in ddition to f cilit ting the inst ll tion of the pyr nometer,
llows continuous monitoring of the correct inst ll tion.
The v rious models re distinguished by the type of output v il ble nd by the pres-
ence or bsence of the "tilt" sensor:
Output
Tilt
Model Digital RS 85
Modbus-RTU Analog
LPS02M00 √ -- --
LPS02M0T √
LPS02MA0 √ Configur ble 4…20 mA (def ult),
0…20 mA, 0…1 V, 0…5 V or 0…10 V
--
LPS02MAT √
The irr di nce r nge for the n log output is user configur ble (def ult, 0…2000
W/m
2
).
The pyr nometers re f ctory c libr ted in ccord nce with the ISO 9847:2023 (Type
A1) st nd rd: ”C libr tion of pyr nometers by comp rison to reference
pyr nometer”. The c libr tion is performed by comp rison with the reference s mple
c libr ted nnu lly t WRC (World R di tion Center).
The DATAsense PC pplic tion softw re, downlo d ble from the Delt OHM website,
llows configuring the sensor (e.g., Modbus p r meters, me suring r nge for the
n log output, etc.), monitor the me surements in re l time, even gr phic lly for the
irr di nce, nd s ve the v lues detected during the connection in file.

LPS02 - 4 - V1.0
2TECHNICAL SPECIFICATIONS
Sensor Thermopile
Me suring r nge -200…4000 W/m
2
The irr di nce r nge for the n log output is configur ble
(def ult 0…2000 W/m
2
)
Resolution 0.1 W/m
2
Viewing ngle 2π sr
Spectr l r nge (50%) 283…2800 nm
Output RS485 Modbus-RTU (isol ted)
Option l ddition l n log output configur ble 4…20 mA
(def ult), 0…20 mA, 0…1 V, 0…5 V or 0…10 V
Power supply 7…30 Vdc for RS485 output
10…30 Vdc for n log output (except 0…10 V)
15…30 Vdc for 0…10 V output
Consumption 15 mA @ 24 Vdc
Connection 5-pole M12 (LPS02M0x)
8-pole M12 (LPS02MAx)
Weight 620 g pprox.
Oper ting conditions -40…+80 °C / 0…100 %RH
Bubble level ccur cy
(For the Tilt sensor accuracy see the
sensor specifications below)
< 0.2°
Protection degree IP 67
M teri ls Housing: nodized luminium
Screen: ASA
Dome: optic l gl ss
MTBF > 10 ye rs
Dimensions (mm)

LPS02 - 5 - V1.0
Technical Specifications According to ISO 9060:2018
Cl ssific tion Spectr lly Fl t Cl ss B
Response time (95%) < 10 s
Zero offset
) response to 200 W/m
2
therm l
r di tion
<±10W/m
2
b) response to 5 K/h ch nge in
mbient temper ture
<±4W/m
2
c) tot l zero offset including the effects
), b) nd other sources
<±15W/m
2
Long-term inst bility (1 ye r) <±1 %
Non-line rity <±1 %
Direction l response
(up to 80° with 1000 W/m
2
be m)
<±18 W/m
2
Spectr l error <±0.5 %
Temper ture response (-10…+40°C) <±1.5 %
Tilt response <±1 %
Diagnostic sensors
Internal Temperature
Me suring r nge -40…+80 °C
Resolution 0.1 °C
Accur cy ±0.5 °C (0…60 °C)
Internal Relative Humidity
Me suring r nge 0…100%
Resolution 0.1%
Accur cy ±3% @ 25 °C (20…80%RH)
Internal pressure
Me suring r nge 300…1100 hP
Resolution 0.1 hP
Accur cy ±1 hP (0…60 °C)
Tilt sensor (only LPS03MxT)
Me suring r nge -180°…+180°
Resolution 0.1°
Accur cy < 0.5°

LPS02 - 6 - V1.0
3MEASURING PRINCIPLE
PYRAsense series pyr nometers re b sed on thermopile sensor. The thermopile
sensitive surf ce is co ted with bl ck m tt p int, which llows the pyr nometer not
to be selective t different w velengths.
R di nt energy is bsorbed by the thermopile bl ck surf ce, thus cre ting difference
of temper ture between the center of the thermopile (hot junction) nd the pyr nom-
eter body (cold junction). Th nks to the Seebeck effect, the difference of temper ture
between hot nd cold junction is converted into difference of potenti l.
The pyr nometer spectr l r nge is determined by the tr nsmission of the two concen-
tric gl ss domes, with 50 nd 30 mm outer di meters, which lso gr nt the thermopile
proper therm l insul tion from the wind nd reduce the sensitivity to therm l irr di-
nce. Furthermore, the domes protect the thermopile from the dust which, depositing
on the bl ckened p rt, could ch nge its spectr l sensitivity.
The speci l m teri l used to m nuf cture the domes llows the spectr l r nge to be
extended to short w velengths st rting from 283 nm.
Considering st nd rd sol r spectrum, the portion of sol r irr di tion detected by the
pyr nometer is gre ter th n 99.8%. Figure 3.1 shows the rel tive spectr l sensitivity of
the LPS02… pyr nometers (blue line) nd the st nd rd sol r spectrum (red line).
Fig. 3.1: LPS02… relative spectral sensitivity and standard solar spectrum
An intern l compens tion circuit minimizes the ch nge of sensitivity with temper ture.
To prevent condens tion from forming on the intern l side of the dome under cert in
clim tic conditions, silic -gel is inserted inside the pyr nometer to bsorb moisture.

LPS02 - 7 - V1.0
INSTALLATION
•The pyr nometer must be mounted in n e sy-to-re ch loc tion in order to cle n
the dome regul rly nd c rry out m inten nce. At the s me time, m ke sure th t
no buildings, constructions, trees or obstructions exceed the horizont l pl ne where
the pyr nometer lies. If this is not possible, select site where obstructions in the
p th of the sun from sunrise to sunset do not exceed 5 degrees of elev tion. N.B.:
The presence of obstructions on the horizon line affects significantly the
measurement of direct irradiance.
•The pyr nometer must be loc ted f r from ny kind of obstruction, which might re-
flect sunlight (or sun sh dow) onto the pyr nometer itself.
•The m st height does not exceed the pyr nometer pl ne to void me surement er-
rors c used by ny reflection or sh dow of the m st itself.
•In compli nce with ISO TR9901 st nd rd nd WMO recommend tions, if the pyr -
nometer is used without the sol r r di tion protection screen, it must be positioned
so th t the connector points to the North Pole, if the instrument is used in the North-
ern Hemisphere, nd to the South Pole, if used in the Southern Hemisphere. In ny
c se, it is better to follow this recommend tion even when the screen is used.
•For fixing, use the two M5 or the two M8 holes in the lower p rt of the pyr nome-
ter. For n ccur te horizont l positioning, djust the height of the two lower feet
with knurled ring, using the bubble level integr ted in the pyr nometer.
Note: for horizontal positioning it is preferable to use the bubble level also in mod-
els equipped with a tilt sensor as it is more accurate; use the tilt sensor for posi-
tioning monitoring after installation. Use the tilt sensor for installation only if the
pyranometer must be positioned tilted with respect to the horizontal plane.
•It is prefer ble to therm lly insul te the pyr nometer from its mounting br cket by
securing it not with the b se directly in cont ct with the support pl te, but by le v-
ing l yer of ir in between (for this purpose, lw ys use the feet even if the in-
st ll tion is not horizont l), while t the s me time ensuring th t there is good
electric l cont ct to ground.
Fig. .1: position of fixing holes and bubble level

LPS02 - 8 - V1.0
.1 O PTIONAL MOUNTING SUPPORTS
Fig. .3: LPS1 bracket for mast

LPS02 - 9 - V1.0
.2 E LECTRICAL CONNECTIONS
The metallic housing of the pyranometer should preferably be
grounded ( ) locally. In this case, do not connect the wire of the
cable corresponding to the housing to prevent ground loops.
Only if it is not possible to ground locally the metallic case of the
pyranometer, connect the wire of the cable corresponding to the
housing to ground.
Intern lly there re surge protection devices connected to the housing. Grounding the
housing llows the correct protection function lity of the devices.
Connector pinout:
LPS02M0x
Pin Function CPM12-5…
wire color
Pyr nometer m le
connector
1 Power supply positive (+Vdc) Brown
2 Power supply neg tive (GND) White
3 RS485 D t + Blue
4 RS485 D t - Bl ck
5 Digit l ground (DGND) Grey
Connector shell
Pyr nometer housing Yellow/Green
LPS02MAx
Pin Function CPM12-8…
wire color
Pyr nometer m le
connector
1 Power supply neg tive (GND) White
2 Power supply positive (+Vdc) Brown
3 Digit l ground (DGND) Green
4 RS485 D t - Yellow
5 RS485 D t + Grey
6 An log ground (AGND) Pink
7 An log output positive (AOUT) Blue
8 Not connected Red
Connector shell
Pyr nometer housing Yellow/Green

LPS02 - 10 - V1.0
Connections:
Fig. .6: electrical connections
RS 85 output:
The RS485 output is isol ted. Before connecting the pyr nometer to the RS485 network,
set the ddress nd the communic tion p r meters, if different from the f ctory preset
(see “Configur tion” ch pter).
Analog output:
In the LPS02MAx models the type of n log output is configur ble (def ult 4…20 mA,
see “Configur tion” ch pter). The pyr nometer power supply nd the lo d resist nce
v ry ccording to the type of n log output configured:
Analog output Power supply required Load resistance
0…20 mA 10…30 Vdc ≤ 500 Ω
4…20 mA 10…30 Vdc ≤ 500 Ω
0…1 V 10…30 Vdc ≥ 100 kΩ
0…5 V 10…30 Vdc ≥ 100 kΩ
0…10 V 15…30 Vdc ≥ 100 kΩ
In the event of n nom ly in the me surement (detected me surement outside the
me suring r nge), the output goes to v lue 10% higher th n the full sc le (e.g., 11
V if the output is 0...10 V or 22 mA if the output is 4…20 mA).
Power supply
PLC, d t logger or
RS485/USB or RS485/RS232
converter for PC
Other sensors with
RS485 output