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

LPS02 - 11 - V1.0
5CONFIGURATION
It is possible to ch nge the seri l communic tion p r meters (Modbus ddress, B ud
R te, p rity/stop bit) nd, for models with n log output, the type of n log output
nd the glob l irr di nce me suring r nge corresponding to the n log output.
The configur tion of the pyr nometer c n be done:
•With the id of DATAsense PC pplic tion softw re (see the softw re online
help), downlo d ble from Delt OHM website.
•By sending seri l comm nds from PC, vi st nd rd communic tion progr m
(see the ch pter “ASCII propriet ry protocol”).
•Vi the “Holding Registers” in MODBUS-RTU mode (only for the seri l communi-
c tion p r meters, see the ch pter “Modbus-RTU protocol”).
By def ult, the instrument h s MODBUS ddress 1 nd communic tion p r meters
19200, 8E1.
Analog output (only LPS02MAx):
By def ult, the n log output is 4…20 mA → 0…2000 W/m
2
.
It is possible:
•to ssoci te the n log output to different glob l irr di nce r nge, within the
full me suring r nge;
•ch nge the output type (possible outputs 4…20 mA, 0…20 mA, 0…1 V, 0…5 V or
0…10 V);
•to reverse the direction of the output, so th t the output decre ses s the me s-
urement incre ses.
Connection to PC:
To connect the pyr nometer to PC USB port, to check or ch nge the configur tion,
the CP2 B-5 (LPS02M0x) or CP2 B-8 (LPS02MAx) option l c bles c n be used,
which lso llow the pyr nometer to be powered vi the USB port.
To use the CP24B-x c bles, the rel ted USB drivers must be inst lled in the PC.
Altern tively, it is possible to use st nd rd RS485/USB or RS485/RS232 converter,
powering the pyr nometer sep r tely (the minimum supply volt ge is 7 V).

LPS02 - 12 - V1.0
6ASCII PROPRIETARY PROTOCOL
To communic te with the pyr nometer vi the ASCII propriet ry protocol:
1. Connect the pyr nometer to the PC nd st rt st nd rd seri l communic tion
progr m.
2. In the seri l communic tion progr m, set the B ud R te 57600, the p r meters
8N2 nd the COM port number to which the pyr nometer is connected.
3. Power the pyr nometer (or power cycle if lre dy powered) nd send the com-
m nd @ within 5 seconds from the instrument power on (the pyr nometer re-
plies &| if the comm nd @ is recognized).
Note: if the CP24B-x c ble is used, to power cycle the pyr nometer, disconnect
the c ble for few seconds from the PC USB port, then reconnect it.
. Send the comm nd CAL USER ON (the pyr nometer replies CAL USER
ON;USER ON) to en ble the configur tion ch nge. The comm nd CAL USER ON is
not required only for re ding the settings.
5. Send the comm nds described in the t bles below.
The comm nd CAL USER ON is utom tic lly dis bled fter few minutes of in ctivity.
The comm nd CAL USER ON c n be dis bled immedi tely by sending the comm nd CAL
EXIT.
Ping:
Command Reply Description
P0 P0;&| Ping.
Pyranometer general information:
Command Reply Description
G0 G0;model| Model
G1 G1;sub-model| Sub-model
G2 G2;nnnnnnnn| Seri l number
G3 G3;xx.yy| Firmw re revision
G4 G4; /mm/gg| Firmw re revision d te
G5 G5;xx.yy| H rdw re revision
G6 G6;nnnnn| Oper ting time in d ys from first power on
G7 G7;nnnnn| Oper ting time in d ys from l st power on
GD GD; /mm/gg hh:mm:ss| F ctory c libr tion d te nd time
User code:
The user code is n lph numeric string of up to 8 ch r cters th t the user c n set to
identify the pyr nometer with mnemonic n me.
Command Reply Description
CUCnnnnnnnn CUC;&| Sets nnnnnnnn s user code. Def ult=blank
RUC RUC;nnnnnnnn| Re ds the user code.

LPS02 - 13 - V1.0
RS 85 Modbus-RTU communication parameters:
Command Reply Description
CMAn CMA;&| Sets the Modbus-RTU ddress (1…247) to n. Def ult=1
RMA RMA;n| Re ds the Modbus-RTU ddress.
CMBn CMB;&| Sets the B ud R te:
9600 if n=0
19200 if n=1 (default)
38400 if n=2
57600 if n=3
115200 if n=4
RMB RMB;n| Re ds B ud R te setting.
CMPn CMP;&| Sets p rity nd stop bits (d t bits = 8 fixed):
8N1 if n=0 ▪ 8N2 se n=1
8E1 if n=2 (default) ▪ 8E2 se n=3
8O1 if n=4 ▪ 8O2 se n=5
RMP RMP;n| Re ds the setting of p rity nd stop bits.
CMWn CMW;&| Sets w iting time fter tr nsmission with Modbus-RTU
protocol:
Immedi te reception if n=0 (viol tes protocol)
W iting 3.5 ch r cters if n=1 (respects protocol)
Default : W iting 3.5 ch r cters (n=1)
RMW RMW;n| Re ds the setting of w iting time fter tr nsmission with
Modbus-RTU protocol.
Analog output (only LPS02MA…):
Command Reply Description
CASn CAS;&| Sets the n log output type:
0…20 mA if n=0
4…20 mA if n=1 (default)
0...1 V if n=2
0...5 V if n=3
0...10 V if n=4
RAS RAS;n| Re ds the type of n log output set.
CAInnnn CAI;&| Sets nnnn s irr di nce minimum v lue in W/m
2
for the
n log output. Min=-200, def ult=0
RAI RAI;nnnn| Re ds the irr di nce minimum v lue in W/m
2
for the
n log output.
CAFnnnn CAF;&| Sets nnnn s irr di nce m ximum v lue in W/m
2
for the
n log output. M x=4000, def ult=2000
RAF RAF;nnnn| Re ds the irr di nce m ximum v lue in W/m
2
for the n-
log output.
CAin CAi;&| Sets the direct or reversed correspondence between n -
log output nd irr di nce:
If n=0: Min. output  Min. irr di nce
M x. output  M x. irr di nce
If n=1: Min. output  M x. irr di nce
M x. output  Min. irr di nce
Default : Direct correspondence (n=0)
RAi RAi;n| Re ds the type of correspondence (direct or reversed)
between n log output nd irr di nce.

LPS02 - 14 - V1.0
Units of measurement:
Ch nging the temper ture units of me surement ffects the Modbus protocol only. The
temper ture me surement provided by the ASCII propriet ry protocol (comm nds
S0/S1) is lw ys in °C.
Command Reply Description
TTn WUT;&| Sets the temper ture unit of me surement:
°C if n=0 (default)
°F if n=1
K if n=2
RUT RUT;n| Re ds the temper ture unit of me surement.
Measurements reading:
Command Reply Description
S0 S0;meas| Prints the me surements in the following sequence:
Temper ture compens ted irr di nce in W/m
2
(it takes into account the change in sensor sen-
sitivity as temperature changes)
Nomin l irr di nce in W/m
2
(calculated considering the sensor nominal sen-
sitivity at the calibration temperature: ∼ 23 °C)
Sign l in mV gener ted by the thermopile
Intern l temper ture in °C
Intern l rel tive humidity in %
Intern l pressure in hP
Tilt ngle (only LPS02MxT)
Power supply volt ge
If the utom tic sending of the me surements is en bled
(comm nd S1), sending S0 dis bles the utom tic send-
ing.
S1 S1;meas| En bles the utom tic sending of the me surements, once
per second.
Diagnostics alarm thresholds:
Command Reply Description
WAL1n…n WAL1;&| Sets to n…n the oper ting time l rm threshold fro
m first
power on (0…65535 d ys, def ult=730 d ys  2 ye rs).
AL1 AL1;n…n| Re ds the oper ting time l rm threshold from first
power on.
WAL2n…n WAL2;&| Sets to n…n the oper ting time l rm threshold from
l st power on (0…65535 d ys, def ult=730 d ys  2
ye rs).
AL2 AL2;n…n| Re ds the oper ting time l rm threshold from l st
power on.
WAL3n…n WAL3;&| Sets to n…n, in the set unit of me surement, the inter-
n l temper ture l rm threshold (0…150 °C, def ult=80
°C).
AL3 AL3;n…n| Re ds the intern l temper ture l rm threshold.
WAL4n…n WAL4;&| Sets to n…n% the intern l rel tive humidity l rm
threshold (0…100%, def ult=25%).
AL4 AL4;n…n| Re ds the intern l rel tive humidity l rm threshold.

LPS02 - 15 - V1.0
Command Reply Description
WAL5n…n WAL5;&| Sets to n…n hP the intern l pressure l rm threshold
(800…1100 hP , def ult=1100 hP ).
AL5 AL5;n…n| Re ds the intern l pressure l rm threshold.
All l rm thresholds re integer v lues with resolution 1 (1 d y, 1 °C/°F/K, 1 %RH, 1
hPa).
The l rm condition occurs when the p r meter becomes gre ter th n the set thresh-
old.

LPS02 - 16 - V1.0
7MODBUS-RTU PROTOCOL
By def ult, the pyr nometer h s Modbus ddress 1 nd communic tion p r meters
19200, 8E1. The ddress nd the communic tion p r meters c n be ch nged by using
the ppropri te seri l comm nds of the propriet ry protocol or, ltern tively, directly
with Modbus comm nds by ch nging the v lue of the Holding Registers described l t-
er.
The Modbus-RTU protocol is ctive fter few seconds from the sensor power on.
Below is the list of registers.
Input Registers:
Address Description Format
MEASUREMENTS
1 Temper ture compens ted irr di nce in W/m
2
(x10)
(it takes into account the change in sensor sensitivity as
temperature changes)
32-bit Integer
3 Nomin l irr di nce in W/m
2
(x10)
(calculated considering the sensor nominal sensitivity at the
calibration temperature: ∼ 23 °C)
32-bit Integer
6 Intern l rel tive humidity in % (x10) 16-bit Integer
7 Intern l temper ture in the set unit of me surement (x10) 16-bit Integer
8 Intern l pressure in hP (x10) 16-bit Integer
9 Sign l in mV gener ted by the thermopile (x1000) 32-bit Integer
11 Tilt ngle (only LPS02MxT) (x10) 16-bit Integer
PYRANOMETER GENERAL INFORMATION
16…25 Model (20 ch r cters) String
26…35 Sub-model (20 ch r cters) String
36…39 Seri l number (8 ch r cters) String
40…43 Firmw re revision (8 ch r cters) String
44…47 H rdw re revision (8 ch r cters) String
CALIBRATION HISTORY
50 Sensitivity of l st c libr tion in µV/Wm
-2
(x1000) 32-bit Integer
52…55 D te of l st c libr tion (yyyymmdd) String
56 Sensitivity of historic l c libr tion 1 in µV/Wm
-2
(x1000) 32-bit Integer
58…61 D te of historic l c libr tion 1 (yyyymmdd) String
62 Sensitivity of historic l c libr tion 2 in µV/Wm
-2
(x1000) 32-bit Integer
64…67 D te of historic l c libr tion 2 (yyyymmdd) String
68 Sensitivity of historic l c libr tion 3 in µV/Wm
-2
(x1000) 32-bit Integer
70…73 D te of historic l c libr tion 3 (yyyymmdd) String
74 Sensitivity of historic l c libr tion 4 in µV/Wm
-2
(x1000) 32-bit Integer
76…79 D te of historic l c libr tion 4 (yyyymmdd) String

LPS02 - 17 - V1.0
Address Description Format
80 Sensitivity of historic l c libr tion 5 in µV/Wm
-2
(x1000) 32-bit Integer
82…85 D te of historic l c libr tion 5 (yyyymmdd) String
OPERATING TIME
100 Oper ting time in d ys from first power on 16-bit Integer
101 Oper ting time in d ys from l st power on 16-bit Integer
Notes on the registers format:
1) To re d 32-bit integer v lue, two consecutive registers st rting from the one in-
dic ted must be ccessed. The register with lower ddress cont ins the most signif-
ic nt bits.
Ex mple: the temper ture compens ted irr di nce, for ex. 50.1 W/m
2
, is v il ble
in the registers with ddress 1 nd 2.
Register ddress 1 2
Register content (Hex) 0000 01F5
Re d v lue 0x000001F5 = 501 = 50.1 W/m
2
2) The lph numeric strings re cont ined in series of 16-bit registers. E ch regis-
ter cont ins 2 ch r cters of the string: the most signific nt 8 bits cont in the
ASCII code of the first ch r cter, the le st signific nt 8 bits cont in the ASCII
code of the next ch r cter. The st rt ch r cter of the string is in the register of
the series with the lowest ddress.
Ex mple: the pyr nometer model, for ex. LPS02MAT, is v il ble in the registers
with ddress from 16 to 25.
Register ddress 16 17 18 19 20 21 22 23 2 25
Register
content (Hex)
4C50 5330 324D 4154 0000 0000 0000 0000 0000 0000
Re d v lue L P S 0 2 M A T
Discrete inputs:
Address Description Format
0 Oper ting time l rm from first power on Bit
1 Oper ting time l rm from l st power on Bit
2 Intern l temper ture l rm Bit
3 Intern l rel tive humidity l rm Bit
4 Intern l pressure l rm Bit
The v lue of "Discrete input", norm lly t 0, becomes 1 when the l rm threshold
set with the rel tive "Holding register" is exceeded.

LPS02 - 18 - V1.0
Holding Registers:
Address Description Format
0 RS485 Modbus-RTU B ud R te:
0=9600
1=19200 (def ult)
2=38400
3=57600
4=115200
16-bit Integer
1 RS485 Modbus-RTU p rity nd stop bits:
0=8N1
1=8N2
2=8E1 (def ult)
3=8E2
4=8O1
5=8O2
16-bit Integer
2 Modbus-RTU ddress (1…247, def ult=1). 16-bit Integer
5 Temper ture unit of me surement:
0=°C (def ult)
1=°F
2=K
16-bit Integer
6 Oper ting time l rm threshold from first power on (0…65535
d ys, def ult=730 d ys  2 ye rs)
16-bit Integer
7 Oper ting time l rm threshold from l st power on (0…65535
d ys, def ult=730 d ys  2 ye rs)
16-bit Integer
8 Intern l temper ture l rm threshold in the set unit of me s-
urement (0…150 °C, def ult=80 °C)
16-bit Integer
9 Intern l rel tive humidity l rm threshold in % (0…100 %,
def ult=25%)
16-bit Integer
10 Intern l pressure l rm threshold in hP (800…1100 hP , de-
f ult=1100 hP )
16-bit Integer
All l rm thresholds re integer v lues with resolution 1 (1 d y, 1 °C/°F/K, 1 %RH, 1
hPa).

LPS02 - 19 - V1.0
8MEASUREMENT WITH ANALOG OUTPUT (only LPS02MA…)
C lcul tion of the glob l irr di nce E
e
(W/m
2
) s function of the n log output v lue
V
out
(in V) or I
out
(mA).
Analog output Global irradiance
0…20 mA E
e
= E
is
+ [(E
fs
– E
is
) • I
out
/20]
4…20 mA E
e
= E
is
+ [(E
fs
– E
is
) • (I
out
– 4)/16]
0…1 V E
e
= E
is
+ [(E
fs
– E
is
) • V
out
]
0…5 V E
e
= E
is
+ [(E
fs
– E
is
) • V
out
/5]
0…10 V E
e
= E
is
+ [(E
fs
– E
is
) • V
out
/10]
Where E
is
nd E
fs
re respectively the glob l irr di nce (in W/m
2
) corresponding to
the n log output initi l nd full sc le.
Considering the def ult v lues E
is
= 0 nd E
fs
= 2000 W/m
2
, the previous formul s
c n be simplified into the following ones:
Analog output Global irradiance
0…20 mA E
e
= 100 • I
out
4…20 mA E
e
= 125 • (I
out
– 4)
0…1 V E
e
= 2000 • V
out
0…5 V E
e
= 400 • V
out
0…10 V E
e
= 200 • V
out

LPS02 - 20 - V1.0
9USE OF THE DIAGNOSTIC SENSORS
The intern l temper ture, rel tive humidity, pressure nd tilt (only LPS02MxT) diag-
nostic 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 surements.
Internal temperature
As rule, the intern l temper ture of the pyr nometer is on ver ge 5 to 10 °C high-
er th n the extern l mbient temper ture. Temper tures th t re excessively lower or
higher th n indic ted m y be sign of m lfunctions.
Monitoring the intern l temper ture therefore m kes it possible to determine whether
the irr di nce me surement c n be considered reli ble.
Internal relative humidity
To minimize condens tion nd keep me surements ccur te, desicc nt silic -gel is
provided inside the pyr nometer b se to bsorb moisture. The silic -gel life is t le st
4 ye rs. The long-term monitoring of the intern l rel tive humidity of the pyr nome-
ter llows the efficiency of the silic -gel to be checked. A progressive upw rd trend in
rel tive humidity indic tes the progressively decre sing bility of silic -gel to bsorb
moisture.
The intern l rel tive humidity depends not only on the s tur tion level of the silic -gel
but lso on the temper ture of the pyr nometer; therefore, short-term humidity mon-
itoring is not p rticul rly signific nt in determining the condition of the silic -gel. Rel -
tive humidity monitoring c n be nnu l.
It is dvis ble to detect the rel tive humidity during the night, when the temper ture
is lower nd the rel tive humidity is higher.
Silic -gel c n be considered close to s tur tion when the intern l rel tive humidity is
persistently bove 50% t temper tures below 20 °C.
Internal pressure
Monitoring the intern l pressure of the pyr nometer llows the housing to be checked
for tight se l (no le k ge). The pressure/temper ture r tio should rem in pproxi-
m tely const nt.
Tilt
Monitoring the inclin tion ngle of the pyr nometer inst ll tion llows for the detec-
tion of unw nted displ cements th t m y occur in the long term or s result of im-
p cts suffered by the inst ll tion.
T ke the me surement of the Tilt sensor immedi tely fter inst ll tion nd consider it
s reference for subsequent me surements.
Alarm thresholds
Thresholds c n be defined for intern l temper ture, rel tive humidity nd pressure.
When the thresholds re exceeded n l rm condition is gener ted, which c n be re d
vi the Modbus “Discrete inputs” or the DATAsense softw re.
The thresholds c n be set vi the Modbus “Holding registers”, the WAL3/WAL4/WAL5
seri l comm nds or the DATAsense softw re.