GHM DeltaOHM LPPHOT02 User manual

Operating manual
Photometric probe
LPPHOT02
w
ww.deltaohm.com
English
Keep for future reference.

LPUVA02 - 2 - V2.0
TABLE OF CONTENTS
1 INTRODUCTION .................................................................................................... 3
2 WORKING RINCI LE ........................................................................................... 4
3 INSTALLATION ..................................................................................................... 5
4 ELECTRICAL CONNECTIONS .................................................................................. 8
4.1 LPPHOT02 CONNECTIONS ..................................................................................... 8
4.2 LPPHOT02AC CONNECTIONS ................................................................................. 9
4.3 LPPHOT02AV CONNECTIONS ................................................................................. 9
5 MEASUREMENT ................................................................................................... 10
5.1 LPPHOT02 ..................................................................................................... 10
5.2 LPPHOT02AC ................................................................................................. 10
5.3 LPPHOT02AV ................................................................................................. 10
6 MAINTENANCE .................................................................................................... 11
7 TECHNICAL S ECIFICATIONS ............................................................................. 12
8 SAFETY INSTRUCTIONS ...................................................................................... 13
9 ACCESSORIES ORDERING CODES ....................................................................... 14

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1 INTRODUCTION
The L HOT02 probe me sures illumin nce (lux), defined s the r tio between the
luminous flux (lumen) through surf ce nd the surf ce re itself (m
2
).
The spectr l response curve of photometric probe is equ l to the hum n eye, known
s standard photopic curve V(λ). The difference in spectr l response between the
LPPHOT02 nd the st nd rd photopic curve V(λ) is ev lu ted through the c lcul tion
of the error f'
1
.
The probe h s been designed for outdoor installation for long periods, in p rticu-
l r for the me surement of d ylight in clim tologic l nd meteorologic l pplic tions.
Av il ble in the following versions:
•L HOT02: PASSIVE.
•L HOT02AC: ACTIVE with 4..20 mA CURRENT output.
•L HOT02AV: ACTIVE with 0..1 or 0..5 or 0..10 V VOLTAGE output to be de-
fined when ordering.
E ch luxmeter is individu lly c libr ted t the f ctory nd is distinguished by its own
c libr tion f ctor. The c libr tion is performed by comp rison with the reference lux-
meter of the Delt OHM metrology l bor tory, using n illumin nt "A" s source, s
required by CIE public tion N°69 “Methods of ch r cterizing illumin nce meters nd
lumin nce meters: Perform nce, ch r cteristics nd specific tions”.

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2WORKING RINCI LE
LPPHOT02 probe is b sed on solid st te sensor, whose spectr l response h s been
d pted to th t of the hum n eye using speci l filter. The rel tive spectr l response
is reported on figure 2.1.
Fig. 2.1
The luxmeter is provided with 50 mm extern l di meter dome in order to supply
suit ble protection of the sensor to the we ther gents.
The response in ccord nce with the cosine l w h s been obt ined th nks to the p r-
ticul r sh pe of the diffuser nd of the housing. The devi tion between the theoretic l
response nd the me sured one is shown in the Fig. 2.2.
Angle
Fig. 2.2
The excellent rel tion between the response of the luxmeter nd the cosine l w llows
using the instrument lso when the sun h s very low r ising.
Rel tive spect
r l response
% shifting from theoret
ic l response
St nd rd photopic curve
Spectr l response LPPHOT02

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3INSTALLATION
Before inst lling the sensor, refill the c rtridge cont ining silic -gel cryst ls. Silic gel
bsorbs humidity in the dome ch mber nd prevents, in p rticul r clim tic conditions,
condens tion on the intern l w lls of the domes nd me surement lter tion.
Do not touch the silic gel cryst ls with your h nds while refilling the c rtridge. C rry
out the following instructions in n environment s drier s possible:
1. Loosen the three screws th t fix the white sh de disk.
2. Unscrew the silic gel c rtridge using coin.
3. Remove the c rtridge perfor ted c p.
4. Open the s chet cont ining silic gel (supplied with the instrument).
5. Fill the c rtridge with the silic gel cryst ls.
6. Close the c rtridge with its own c p, p ying ttention th t the se ling O-ring be
properly positioned.
7. Screw the c rtridge to the sensor body using coin.
8. Check th t the c rtridge is screwed tightly (if not, silic gel life will be reduced).
9. Position the sh de disk nd screw it with the screws.
10. The sensor is re dy for use.
The figure below shows the oper tions necess ry to fill the c rtridge with the silic gel
cryst ls.
Fig. 3.1: filling the silica-gel cartridge
Silica-gel
cartridge
Perforated cap
Sealed s
achet
of silica-gel crystals
Filling Closing the cartridge

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•The sensor 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 sensor 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.
•The sensor must be loc ted f r from ny kind of obstruction, which might reflect
sunlight (or sun sh dow) onto the sensor itself.
•For fixing, use the holes on the sensor body (remove the sh de disk to ccess the
holes nd reposition it fter mounting) or the suit ble ccessories (see the figures
below). In order to llow n ccur te horizont l positioning, the sensor is equipped
with levelling device: the djustment is m de by me ns of the two levelling
screws th t llow djusting the sensor inclin tion. The m st height does not exceed
the sensor pl ne to void me surement errors c used by ny reflection or sh dow
of the m st itself.
•It is prefer bly to therm lly insul te the sensor from its mounting br cket ensuring,
t the s me time, good electric l cont ct to ground.
Fig. 3.2: fixing holes and levelling device
Fixing holes ∅ 6 mm
Levelling
device

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HD2003.79K
HD2003.77C
HD2003.83
HD2003.83.1
HD2003.85K
Fig. 3.3: fixing accessories

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4ELECTRICAL CONNECTIONS
L HOT02… h s 4-pole connector nd uses the C M12AA4... optional c bles.
The metallic housing of the sensor should preferably be ground-
ed ( ) 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
sensor, connect the wire of the cable corresponding to the hous-
ing to ground. Note: in LPPHOT02AV the housing is not connected to
the connector.
4.1 L HOT02 CONNECTIONS
The luxmeter LPPHOT02 is passive nd does not require power supply. It is to be
connected either to millivoltmeter or to d t cquisition system. Typic lly, the
luxmeter output sign l does not exceed 150 mV. In order to better exploit the luxme-
ter fe tures, the re dout instrument should h ve 1 µV resolution.
Connector Function Color
1 +Vout Red
2 -Vout Blue
3 Housing (C) White
4 C ble shield (SH) Bl ck
12
34
+Vout
-Vout
SH
C
Fig. 4.1: L HOT02 connections
C
PM12AA
4
…
c
ble
Lux
meter M12
m le connector
D t logger or
converter/ mplifier
with V or mA output
Connect to ground only if it is not possible to
ground locally the housing of the luxmeter

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4.2 L HOT02AC CONNECTIONS
The LPPHOT02AC luxmeter h s 4…20 mA output nd requires 10…30 Vdc extern l
power supply. It is to be connected to power supply nd n instrument with 4…20
mA input s shown in fig. 4.2. The lo d resist nce of the instrument re ding the sign l
must be ≤ 500 Ω.
Connector Function Color
1 Positive (Iin) Red
2 Neg tive (Iout) Blue
3 Housing (C) White
4 C ble shield (SH) Bl ck
4...20 mA
12
34SH
Iin
Iout
C
Fig. 4.2: L UVA02AC connections
4.3 L HOT02AV CONNECTIONS
The LPPHOT02AV luxmeter h s 0…1 V, 0…5 V or 0…10 V output (depending on the
ordered output) nd requires extern l power supply: 10…30 Vdc for 0…1 V nd
0…5 V outputs, 15…30 Vdc for 0…10 V output. It is to be connected to power sup-
ply nd n instrument with volt ge input s shown in fig. 4.3. The lo d resist nce of
the instrument re ding the sign l must be ≥ 100 kΩ.
Connector Function Color
1 Output positive (+Vout) Red
2 Output neg tive
Power supply neg tive (GND) Blue
3 Power supply positive (+Vdc) White
4 C ble shield (SH) Bl ck
12
34
SH
GND
+Vdc
+Vout
Fig. 4.3: L HOT02AV connections
CPM12AA
4
…
c
ble
Lux
meter M12
m le connector
Power supply
Connect to ground only if it is not possible to
ground locally the housing of the luxmeter
Instrument with
4…20 mA input
CPM12AA
4
…
c
ble
Lux
meter M12
m le connector
Power supply
Instrument
with
volt ge input

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5MEASUREMENT
Below re the w ys to c lcul te the illumin nce.
5.1 L HOT02
E ch luxmeter is distinguished by its own sensitivity (or c libr tion f ctor) S ex-
pressed in mV/klux nd shown in the l bel on the sensor ( nd in the c libr tion re-
port).
The irr di nce E
e
is obt ined by me suring with multimeter the difference of potenti l
DDP t the ends of the sensor nd pplying the following formul :
E
e
= DDP / S
where:
E
e
is the illumin nce expressed in klux;
DDP is the difference of potenti l expressed in mV me sured by the multimeter;
S is the sensitivity of the luxmeter expressed in mV/klux.
5.2 L HOT02AC
The 4…20 mA output sign l corresponds to 0…150 klux illumin nce r nge.
The illumin nce E
e
is obt ined by me suring with multimeter the current I
out
bsorbed
by the sensor nd pplying the following formul :
E
e
= 9.375
•
(I
out
– 4mA)
where:
E
e
is the illumin nce expressed in klux;
I
out
is the current expressed in mA bsorbed by the luxmeter.
5.3 L HOT02AV
The output sign l (0…1 V, 0…5 V or 0…10 V depending on the version) corresponds to
0…150 klux illumin nce r nge.
The illumin nce E
e
is obt ined by me suring with multimeter the output volt ge V
out
of
the sensor nd pplying the following formul :
E
e
= 150
•
V
out
for the version 0…1 V
E
e
= 30
•
V
out
for the version 0…5 V
E
e
= 15
•
V
out
for the version 0…10 V
where:
E
e
is the illumin nce expressed in klux;
V
out
is the output volt ge expressed in V me sured by the multimeter.

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6MAINTENANCE
In order to gr nt me surements high ccur cy, it is import nt to keep the gl ss dome
cle n. Consequently, the more the dome will be kept cle n, the more me surements
will be ccur te.
You c n w sh it using w ter nd st nd rd p pers for lens. If necess ry, use pure
ETHYL lcohol. After using lcohol, cle n g in the dome with w ter only.
Bec use of the high temper ture ch nges between d y nd night, some condens tion
might ppe r on the sensor dome. In this c se the performed re ding is highly over-
estim ted. To minimize the condens tion, the sensor is provided with c rtridge con-
t ining dessic nt m teri l (silic -gel). The efficiency of the silic -gel cryst ls decre s-
es over time while bsorbing humidity. Silic -gel cryst ls re efficient when their col-
our is yellow, while they turn white/translucent s soon s they lose their efficien-
cy. Re d instructions t ch pter 3 bout how to repl ce the silic -gel cryst ls. Silic -
gel typic l lifetime goes from 2 to 6 months depending on the environment where the
sensor works.
To exploit ll the sensor fe tures, it is highly recommended th t the c libr tion be
checked nnu lly.

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7TECHNICAL S ECIFICATIONS
Measuring range 0…150 klux
Typical sensitivity 0.5...2 mV/klux
Viewing range 2π sr
Impedance 0.5…1 KΩ
Spectral range St nd rd photopic curve
Response time <0.5 s (95%)
Output LPPHOT02 = mV/klux
LPPHOT02AC = 4…20 mA
LPPHOT02AV = 0…1, 0…5, 0…10 V (depending on
the model)
ower supply 10…30 Vdc (15…30 Vdc only for 0…10 V output)
Operating temperature -40 °C…+80 °C
Response according to the cosine law < 8 % (0…80°)
Long term instability (1 year) <|±3| %
Error f’
1
<9 %
Non linearity <±1 %
Temperature response < 0.1 %/°C
Weight 900 g pprox.

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8SAFETY INSTRUCTIONS
General safety instructions
The instrument h s been m nuf ctured nd tested in ccord nce with the s fety
st nd rd EN61010-1:2010 “S fety requirements for electric l equipment for me s-
urement, control nd l bor tory use” nd h s left the f ctory in perfect s fety tech-
nic l conditions.
The instrument proper oper tion nd oper ting s fety c n be ensured only if ll
st nd rd s fety me sures s well s the specific me sures described in this m nu l
re followed.
Do not use the instruments in pl ces where there re:
•Corrosive or fl mm ble g ses.
•Direct vibr tions or shocks to the instrument.
•High-intensity electrom gnetic fields, st tic electricity.
User obligations
The instrument oper tor sh ll follow the directives nd regul tions below th t refer to
the tre tment of d ngerous m teri ls:
•EEC directives on workpl ce s fety.
•N tion l l w regul tions on workpl ce s fety.
•Accident prevention regul tions.

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9ACCESSORIES ORDERING CODES
The luxmeter is supplied with sh de disk, sylic -gel c rtridge, 2 sp re s chets, level-
ling device, M12 connector nd C libr tion Report.
Accessories
L S 1 UV-resist nt sh de disk (sp re p rt).
L S1 Only tt chment br cket, suit ble for m st with di meter 40…50
mm. Inst ll tion on horizont l or vertic l m st.
L RING02 B se with levelling device nd djust ble holder for mounting the
pyr nometer in n inclined position (specify upon ordering on
which luxmeter model h s to be mounted).
HD2003.79K Kit to mount the luxmeter on ∅ 40 mm cl mping. To inst ll the
luxmeter on tr nsverse m st.
L S6 Kit for the inst ll tion of the luxmeter. The kit includes: 750 mm
m st, b se fitting, gr du ted support pl te, br cket for luxmeter.
C M12AA4… 4-pole c ble. 4-pole M12 connector on one end, open wires on
the other end. Av il ble length 2 m (CPM12AA4.2), 5 m
(CPM12AA4.5) or 10 m (CPM12AA4.10).
L SG C rtridge to cont in desicc nt silic -gel cryst ls, complete with O-
ring nd c p (sp re p rt).
L G P ck of 5 s chets of silic -gel cryst ls.
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 | Delt Ohm S.r.l. socio unico
Vi M rconi 5 | 35030 C selle di Selv zz no | P dov | ITALY
Phone [phone] | F x [phone]
www.delt ohm.com | s les@delt ohm.com
WARRANTY
Delt OHM is required to respond to the "f ctory w rr nty" only in those c ses provided by
Legisl tive Decree 6 September 2005 - n. 206. E ch instrument is sold fter rigorous inspections;
if ny m nuf cturing defect is found, it is necess ry to cont ct the distributor where the
instrument w s purch sed from. During the w rr nty period (24 months from the d te of invoice)
ny m nuf cturing defects found will be rep ired free of ch rge. Misuse, we r, neglect, l ck or
inefficient m inten nce s well s theft nd d m ge during tr nsport re excluded. W rr nty does
not pply if ch nges, t mpering or un uthorized rep irs re m de on the product. Solutions,
probes, electrodes nd microphones re not gu r nteed s the improper use, even for few
minutes, m y c use irrep r ble d m ges.
Delt OHM rep irs the products th t show defects of construction in ccord nce with the terms
nd conditions of w rr nty included in the m nu l of the product. For ny dispute, the competent
court is the Court of P du . The It li n l w nd the “Convention on Contr cts for the Intern tion l
S les of Goods” pply.
TECHNICAL INFORMATION
The qu lity level of our instruments is the result of the continuous product development. This m y
le d to differences between the inform tion reported in the m nu l nd the instrument you h ve
purch sed. In c se of discrep ncies nd/or inconsistencies, ple se write to s les@delt ohm.com.
Delt OHM reserves the right to ch nge technic l specific tions nd dimensions to fit the
product requirements without prior notice.
DIS OSAL INFORMATION
Electric l nd electronic equipment m rked with specific symbol in compli nce
with 2012/19/EU Directive must be disposed of sep r tely from household w ste.
Europe n users c n h nd them over to the de ler or to the m nuf cturer when
purch sing new electric l nd electronic equipment, or to WEEE collection
point design ted by loc l uthorities. Illeg l dispos l is punished by l w.
Disposing of electric l nd electronic equipment sep r tely from norm l w ste helps to
preserve n tur l resources nd llows m teri ls to be recycled in n environment lly friendly
w y without risks to hum n he lth.
RoHS
V2.0
10/2022