Delta OHM LPPYRA-Lite User manual

Operating manual
Pyranometer
LPPYRA-Lite
www.deltaohm.com
English
Keep for future reference.

LPPYRA-Lite - 2 - V1.2
TABLE OF CONTENTS
1 INTRODUCTION .................................................................................................... 3
2 WORKING RINCI LE ........................................................................................... 4
3 INSTALLATION ..................................................................................................... 5
4 ELECTRICAL CONNECTIONS .................................................................................. 8
4.1 LPPYRA-L ITE CONNECTIONS .................................................................................. 8
4.2 LPPYRA-L ITE AC CONNECTIONS ............................................................................... 9
5 MEASUREMENT ................................................................................................... 10
5.1 LPPYRA-L ITE .................................................................................................. 10
5.2 LPPYRA-L ITE AC .............................................................................................. 10
6 MAINTENANCE .................................................................................................... 11
7 TECHNICAL S ECIFICATIONS ............................................................................. 12
8 SAFETY INSTRUCTIONS ...................................................................................... 13
9 ACCESSORIES ORDERING CODES ....................................................................... 14

LPPYRA-Lite - 3 - V1.2
1 INTRODUCTION
LPPYRA-Lite pyra ometer measures the irradia ce o a flat surface (W/m
2
). The
measured irradia ce (Global Irradia ce) is the sum of direct solar irradia ce a d dif-
fuse irradia ce.
LPPYRA-Lite is a Spectrally Flat Class C (Seco d Class) pyra ometer i accorda ce
with ISO 9060:2018 a d with the criteria of the WMO “Guide to Meteorological I -
strume ts a d Methods of Observatio ’”.
The pyra ometer is available i the followi g versio s:
•L YRA-Lite: PASSIVE.
The passive versio ca be co ected to the i strume ts
D09847 a d HD31 by usi g VP472 SICRAM module.
•L YRA-LiteAC: ACTIVE with 2-wire (curre t loop) 4..20 mA output (0…2000
W/m
2
).
The pyra ometer is supplied factory calibrated. The calibratio is carried out i
accorda ce with the ISO 9847:1992 (type IIc) sta dard: ”Calibratio of field
pyra ometers by compariso to a refere ce pyra ometer”. The pyra ometer is
calibrated by compariso with the refere ce sample calibrated a ually at WRC (World
Radiatio Ce ter).
A optio al fixi g base i tegrati g a levelli g device is available as a accessory, for
i stallatio s where horizo tal positio i g is required.

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2WORKING RINCI LE
LPPYRA-Lite pyra ometer is based o a thermopile se sor. The thermopile se sitive
surface is coated with a black matt pai t, which allows the pyra ometer ot to be se-
lective at differe t wavele gths.
Radia t e ergy is absorbed by the thermopile black surface, thus creati g a differe ce
of temperature betwee the ce ter of the thermopile (hot ju ctio ) a d the pyra om-
eter body (cold ju ctio ). Tha ks to the Seebeck effect, the differe ce of temperature
betwee hot a d cold ju ctio is co verted i to a Differe ce of Pote tial.
I order to gra t the thermopile a proper thermal i sulatio from the wi d a d reduce
the se sitivity to thermal irradia ce, LPPYRA-Lite is equipped with a glass dome. The
dome protects the thermopile from the dust, which might cha ge spectral se sitivity if
it lies o the black surface,
To preve t i ter al co de satio formi g o the i ter al side of the dome u der cer-
tai climatic co ditio s, silica gel tablets are i serted i side the pyra ometer to ab-
sorb humidity.
1 2 3 4
Fig. 2.1: scheme of principle L YRA-Lite (version with mV output)
T
h
ermopil
e
Co ector pi s
Housi g

LPPYRA-Lite - 5 - V1.2
3INSTALLATION
•The pyra ometer must be mou ted i a easy-to-reach locatio i order to clea
the dome regularly a d carry out mai te a ce. At the same time, make sure that
o buildi gs, co structio s, trees or obstructio s exceed the horizo tal pla e where
the pyra ometer lies. If this is ot possible, select a site where obstructio s i the
path of the su from su rise to su set do ot exceed 5 degrees of elevatio . N.B.:
The presence of obstructions on the horizon line affects significantly the
measurement of direct irradiance.
•The pyra ometer must be located far from a y ki d of obstructio , which might re-
flect su light (or su shadow) o to the pyra ometer itself.
•I complia ce with ISO TR9901 sta dard a d WMO recomme datio s, the pyra-
ometer must be positio ed so that its co ector is poi ted to the North Pole, if the
i strume t is used i the Norther Hemisphere, a d to the South Pole, if used i
the Souther Hemisphere.
•For fixi g, use the two holes u der the pyra ometer body or the suitable accesso-
ries (see the figures below). I order to allow a accurate horizo tal positio i g,
the optio al L S40/32BL fixi g base i tegrati g a levelli g device ca be used.
The mast height does ot exceed the pyra ometer pla e to avoid measureme t er-
rors caused by a y reflectio or shadow of the mast itself.
•It is preferably to thermally i sulate the pyra ometer from its mou ti g bracket
e suri g, at the same time, a good electrical co tact to grou d.
•
49
Ø40
45°
M12
M5 (2x)
57
55
Fig. 3.1: dimensions and fixing holes

LPPYRA-Lite - 6 - V1.2
M5 (2x)
Ø5.5 (2x)
20
Ø5.5 (2x)
M5 (2x)
L S40/32 L S40/32BL - Integrated levelling device
Fig. 3.2: fixing adapters from 40 to 32 mm holes centre distance
HD2003.77/40
LPPYRA-Lite...
LPS40/32...
Fig. 3.3: fixing on HD2003.77/40 clamping
LPS3
LPPYRA-Lite...
LPS40/32...
Fig. 3.4: fixing on L S3 bracket
Levelli g
device

LPPYRA-Lite - 7 - V1.2
LPPYRA-Lite...
LPS40/32...
LPRING04
Fig. 3.3: fixing on L RING04 adjustable holder

LPPYRA-Lite - 8 - V1.2
4ELECTRICAL CONNECTIONS
L YRA-Lite has a 4-pole co ector a d uses the C M12AA4... optional cables.
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. Note: i LPPYRA-LiteAC the housi g is ot co -
ected to the co ector.
I the powered versio LPPYRA-LiteAC, i ter ally there are surge protectio devices
co ected to the housi g. Grou di g the housi g allows the correct protectio fu c-
tio ality, i particular agai st light i g.
4.1 L YRA-Lite CONNECTIONS
The pyra ometer LPPYRA-Lite is passive a d does ot require power supply. It is to
be co ected either to a millivoltmeter or to a data acquisitio system. Typically, the
pyra ometer output sig al does ot exceed 20 mV. I order to better exploit the py-
ra ometer features, the readout i strume t should have 1 µV resolutio .
Connector Function Color
1 +Vout Red
2 -Vout Blue
3 Not co ected White
4 Cable shield (SH) / Housi g Black
12
34
+Vout
-Vout
SH
Fig. 4.1: L YRA-Lite connections
CPM12AA4… cable
Pyra ometer M12
male co ector
Datalogger or
co verter/amplifier
with V or mA output
Connect to ground only if it is not possible to
ground locally the housing of the pyranometer

LPPYRA-Lite - 9 - V1.2
4.2 L YRA-LiteAC CONNECTIONS
The pyra ometer LPPYRA-LiteAC has 4…20 mA output a d requires 10…28 Vdc ex-
ter al power supply. It is to be co ected to a power supply a d a i strume t with
4…20 mA i put as show i fig. 4.2. The load resista ce of the i strume t readi g the
sig al must be ≤ 500 Ω.
Connector Function Color
1 Positive (Ii ) Red
2 Negative (Iout) Blue
3 Not co ected White
4 Cable shield (SH) Black
4...20 mA
12
34SH
Iin
Iout
Fig. 4.2: L YRA-LiteAC connections
CPM12AA4… cable
Pyra ometer M12
male co ector
Power supply
I strume t with
4…20 mA i put

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5MEASUREMENT
Below are the ways to calculate the global irradia ce.
5.1 L YRA-Lite
Each pyra ometer is disti guished by its ow se sitivity (or calibratio factor) S ex-
pressed i µV/(Wm
-2
) a d show i the label o the pyra ometer (a d i the optio al
calibratio report).
The irradia ce E
e
is obtai ed by measuri g with a multimeter the differe ce of pote tial
DDP at the e ds of the se sor a d applyi g the followi g formula:
E
e
= DDP / S
where:
E
e
is the irradia ce expressed i W/m
2
;
DDP is the differe ce of pote tial expressed i µV measured by the multimeter;
S is the se sitivity of the pyra ometer expressed i µV/(Wm
-2
).
5.2 L YRA-LiteAC
The 4…20 mA output sig al correspo ds to the 0…2000 W/m
2
irradia ce ra ge.
The irradia ce E
e
is obtai ed by measuri g with a multimeter the curre t I
out
absorbed
by the se sor a d applyi g the followi g formula:
E
e
= 125
•
(I
out
- 4)
where:
E
e
is the irradia ce expressed i W/m
2
;
I
out
is the curre t expressed i mA absorbed by the pyra ometer.

LPPYRA-Lite - 11 - V1.2
6MAINTENANCE
I order to gra t measureme ts high accuracy, it is importa t to keep the outer glass
dome clea . Co seque tly, the more the dome will be kept clea , the more measure-
me ts will be accurate.
You ca wash it usi g water a d sta dard papers for le s. If ecessary, use pure
ETHYL alcohol. After usi g alcohol, clea agai the dome with water o ly.
To exploit all the pyra ometer features, it is highly recomme ded that the calibratio
be checked a ually.

LPPYRA-Lite - 12 - V1.2
7TECHNICAL S ECIFICATIONS
Sensor Thermopile
Typical sensitivity 5÷15 µV/Wm
-2
or ormalized 7 µV/Wm
-2
Measuring range 0÷2000 W/m
2
Viewing angle 2π sr
Spectral range (50%) 300÷2800 m
Output L YRA-Lite: µV/Wm
-2
(impeda ce 33...45 Ω)
L YRA-LiteAC: 2-wire (curre t loop) 4…20 mA
(R
L
≤ 500 Ω)
ower supply L YRA-Lite: passive versio , o power required
L YRA-LiteAC: 10…28 Vdc
Consumption L YRA-Lite: passive versio , o power required
L YRA-LiteAC: equal to output sig al (4…20 mA)
Connection 4-pole M12 co ector
Dimensions Fig. 3.1
Weight 150 g approx.
Operating temperature/humidity -40÷80 °C / 0÷100%
rotection degree IP 67
MTBF > 10 years
Technical Specifications According to ISO 9060:2018
Classification Spectrally Flat Class C
Response time (95%) < 25 s
Zero offset
a) response to a 200 W/m
2
thermal
radiation
<±20W/m
2
b) response to a 5 K/h change in
ambiente temperature
<±6W/m
2
c) total zero offset including the
effects a), b) and other sources
<±30W/m
2
Long-term instability (1 year) <±2 %
Non-linearity <±2 %
Response according to the cosine law <±25 W/m
2
Spectral error <±2 %
Temperature response (-10…+40°C) < 3 %
Tilt response <±3 %

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8SAFETY INSTRUCTIONS
General safety instructions
The i strume t has bee ma ufactured a d tested i accorda ce with the safety
sta dard EN61010-1:2010 “Safety requireme ts for electrical equipme t for meas-
ureme t, co trol a d laboratory use” a d has left the factory i perfect safety tech-
ical co ditio s.
The i strume t proper operatio a d operati g safety ca be e sured o ly if all
sta dard safety measures as well as the specific measures described i this ma ual
are followed.
The i strume t proper operatio a d operati g safety ca be e sured o ly i the cli-
matic co ditio s specified i this ma ual.
Do ot use the i strume ts i places where there are:
•Corrosive or flammable gases.
•Direct vibratio s or shocks to the i strume t.
•High-i te sity electromag etic fields, static electricity.
User obligations
The i strume t operator shall follow the directives a d regulatio s below that refer to
the treatme t of da gerous materials:
•EEC directives o workplace safety.
•Natio al law regulatio s o workplace safety.
•Accide t preve tio regulatio s.

LPPYRA-Lite - 14 - V1.2
9ACCESSORIES ORDERING CODES
L S40/32 Fixi g adapter from 40 to 32 mm holes ce tre dista ce.
L S40/32BL Fixi g adapter from 40 to 32 mm holes ce tre dista ce. With i -
tegrated levelli g device. Accuracy of levelli g device < 0.2°.
L S3 Fixi g bracket for the pyra ometer, suitable for ∅ 40 ÷ 50 mm
mast. I stallatio o horizo tal or vertical mast. L S40/32…
adapter is required.
L RING04 Adjustable holder for mou ti g the pyra ometer i a i cli ed
positio o Ø 40 mm mast with i ter al thread. L S40/32…
adapter is required.
HD2003.77/40 Clampi g for mast ∅40 mm to i stall the pyra ometer o a
tra sverse mast. L S40/32… adapter is required.
C M12AA4… Cable with 4-pole M12 co ector o o e e d, ope wires o the
other e d. Le gth 2 m (CPM12AA4.2), 5 m (CPM12AA4.5) or 10 m
(CPM12AA4.10).
DELTA OHM metrology laboratories LAT N° 124 are ISO/IEC 17025 accredited by
ACCREDIA for Temperature, Humidity, ressure, hotometry / Radiometry, Acous-
tics and Air Velocity. They can supply calibration certificates for the accredited
quantities.

GHM GROU – Delta OHM | Delta Ohm S.r.l. a socio u ico
Via Marco i 5 | 35030 Caselle di Selvazza o | Padova | ITALY
Pho e [phone] | Fax [phone]
www.deltaohm.com | [e-mail]
WARRANTY
Delta OHM is required to respo d to the "factory warra ty" o ly i those cases provided by
Legislative Decree 6 September 2005 - . 206. Each i strume t is sold after rigorous i spectio s;
if a y ma ufacturi g defect is fou d, it is ecessary to co tact the distributor where the
i strume t was purchased from. Duri g the warra ty period (24 mo ths from the date of i voice)
a y ma ufacturi g defects fou d will be repaired free of charge. Misuse, wear, eglect, lack or
i efficie t mai te a ce as well as theft a d damage duri g tra sport are excluded. Warra ty does
ot apply if cha ges, tamperi g or u authorized repairs are made o the product. Solutio s,
probes, electrodes a d micropho es are ot guara teed as the improper use, eve for a few
mi utes, may cause irreparable damages.
Delta OHM repairs the products that show defects of co structio i accorda ce with the terms a d
co ditio s of warra ty i cluded i the ma ual of the product. For a y dispute, the compete t court
is the Court of Padua. The Italia law a d the “Co ve tio o Co tracts for the I ter atio al Sales
of Goods” apply.
TECHNICAL INFORMATION
The quality level of our i strume ts is the result of the co ti uous product developme t. This may
lead to differe ces betwee the i formatio reported i the ma ual a d the i strume t you have
purchased. I case of discrepa cies a d/or i co siste cies, please write to [e-mail].
Delta OHM reserves the right to cha ge tech ical specificatio s a d dime sio s to fit the
product requireme ts without prior otice.
DIS OSAL INFORMATION
Electrical a d electro ic equipme t marked with specific symbol i complia ce
with 2012/19/EU Directive must be disposed of separately from household waste.
Europea users ca ha d them over to the dealer or to the ma ufacturer whe
purchasi g a ew electrical a d electro ic equipme t, or to a WEEE collectio
poi t desig ated by local authorities. Illegal disposal is pu ished by law.
Disposi g of electrical a d electro ic equipme t separately from ormal waste helps to
preserve atural resources a d allows materials to be recycled i a e viro me tally frie dly
way without risks to huma health.
RoHS
V1.2
05/2022