GHM DeltaOHM LPPHOT01 User manual

Operating manual
Photometric
/radiometric probes
LPPHOT01
– LPPAR01 –
LPRAD01
LPUVA01
–LPUVB01 –LPUVC01
www.deltaohm.com
English
Ke ep for fut ure reference .

TABLE OF CON TEN TS
1I NTROD UCTI ON .................................................................................................... 3
2PRO BES TECH N I CAL CH ARACTERI STI CS ............................................................... 4
2.1 LPPHOT01 ....................................................................................................... 4
2.2 LPRAD01 ........................................................................................................ 6
2.3 LPPAR01 ......................................................................................................... 7
2.4 LPUVA01 ........................................................................................................ 8
2.5 LPUVB01 ........................................................................................................ 9
2.6 LPUVC01 ...................................................................................................... 10
3I N STALLATI ON ................................................................................................... 11
3.1 ELECTRI CAL CONNECTI ONS ............................................................................ 11
4MEASUREM EN T ................................................................................................... 12
5SAFETY I N ST RUCTI O N S ...................................................................................... 13
6ORDERI N G COD ES .............................................................................................. 14

1 I N TRODUCTI ON
The probes of t he series LP…01 allow m easurem ent of phot om et ric and r adiom et ric
quant it ies such as illum inance ( lu x) , ir radiance ( W/ m 2) across VI S-NI R, UVA, UVB,
UVC spect ral regions, t he num ber of phot ons per t im e unit and ar ea in t he PAR region
( 400 nm …700 nm ) .
I n probes LP….01 there is no need for external power supply. The out put signal in m V
is given t hrough a r esist or shunt ing t he phot odiode ends. The photocurrent generated
by the phot odiode when hit by light, is convert ed to a pot ent ial difference, which is
read by a volt m et er. Once t he DDP ( Pot ent ial Difference) is known, t he m easured val-
ue can be calculat ed t hrough t he calibrat ion fact or.
Ea ch p rob e is in div idu a lly ca lib r at e d. Th e se nsit iv it y fa ct or is m a r k ed on t h e
housin g of t he probe a nd is spe cific t o t h at pr obe .
LPPHOT01 and LPPAR01 probes are equipped wit h cosine cor rect ed diffuser .
LP…01 probes are su it a ble for in door a pplica t ion s which requires t he const ant
m onit or ing of t he quant it ies specified.
The output signal can be am plified or converted into a 4…20 m A or 0…10 Vdc signal
by using a convert er of t he series HD978TR3 ( 4…20 m A) or HD978TR4 (0…10 Vdc) for
DI N rail at t achm ent , or t he wall m ount ing t ypes HD978TR5 ( 4.…20 m A) and
HD978TR6 (0…10 Vdc) .

2 PROBES TECH N I CAL CH ARACTERI STI CS
All probes are com posed of a photodiode, a filt er, a diffuser, t he case and a 5 m et ers
cable allowing the connect ion of the probe t o t he reading instrum ent .
The t ypical var iat ion of pr obe sensit iv it y w it h t em perat ure var iat ion is -0.1% / oC. The
sensit ivity factor shown on t he probe was obt ained in an air-condit ioned env ironm ent
at an am bient t em perat ure of 23 ° C and relat ive hum idit y 50 ±10 % .
2 .1 LPPH OT 0 1
The LPPHOT01 probe ( class B luxm et er ) m easures
illu m inan ce ( lux ) defined as the r at io bet ween t he
lum inous flux ( lum en) passing t hrough a surface and t he
surface area ( m 2) .
The spect ral response curve of a phot om et ric probe is
equal t o the one of the hum an eye, known as st andard
phot opic cur ve V( λ) .
The difference in spectral response bet ween LPPHOT01 and
t he st andard phot opic cur ve V( λ) is calculat ed by m eans of
the error f1’.
Ph ot om e t ric ch ar act e r ist ics
The spect ral response curve of the LPPHOT01 probe is shown in t he following graph
toget her wit h t he standard phot ot ypical curve.
The calibrat ion of t he pr obe is perform ed by com paring it t o a lux m et er calibr at ed by
a Prim ary Met rological I nst it ut e. The calibrat ion procedure follows t he CI E publicat ion
No 69 ( 1987) “ Met hod of Char act er izing I llum inance Met er s and Lum inance Met er s”
and is carried out by illum inat ing t he probe wit h a st andard illum inant A.
The illum inant A is a reference incandescent lam p wit h a colour t em perat ure of
2856K.
Sp ect r al resp onse

The follow ing figur e show s t he t r end of t he deviat ion fr om t he cosine law as t he angle
varies for t he LPPHOT01 probe:
Te chn ica l spe cifica t ion s
Ty pica l se n sit iv it y 0.5…1.5 m V/ klux
M e a su r in g r an ge 0…200000
Sp ect r a l r an ge V( λ)
Ca lib r a t ion a ccu r a cy < 4%
f’1( V ( λ) m a t ch e r ro r) < 6%
f2( cosin e r e sp on se / d ir e ct ion a l e r r or ) < 3%
f3( lin e a r it y ) < 1%
F5( fa t igu e) < 0.5%
Ope rat in g t e m pe rat u re 0…50° C
Ou t pu t im p eda n ce 0.5…1 kΩ
D im e n sio ns Ø 30 m m x 38 m m height
--
-5
0
5
10
15
20
010 20 30 40 50 60 70 80
Angle of incidence (degrees)
Error %

2 .2 LPRAD0 1
The LPRAD01 probe m easures ir r adian ce ( W/ m 2) defined as
t he r at io bet ween t he flow of energy ( W) crossing a sur face and
t he area of t he sur face considered ( m 2) in t he spect ral region of
the VI S-NI R ( 400 nm …1050 nm ) .
Ph ot om e t ric ch ar act e r ist ics
The spect ral response curve of the LPPOHT01 probe is shown in
t he follow ing gr aph t oget her w it h t he st andar d phot ot ypical
curve.
Pr obe calibrat ion is carried out by using 577/ 579 nm lines of a Xe-Hg lam p, filtered
t hr ough a special int er fer ent ial f ilt er. The t em perature has a negligible influence on
the spect ral response of the probe.
Te chn ica l spe cifica t ion s
Ty pica l se n sit iv it y 2.6 μV/ μW/ cm -2
M e a su r in g r an ge 0…200 m W/ cm 2
Sp ect r a l r an ge ≈400 nm …≈1050 nm
Ca lib r a t ion a ccu r a cy < 6%
f2( cosin e r e sp on se / d ir e ct ion a l e r r or ) < 6%
Ope rat in g t e m pe rat u re 0…50° C
Ou t pu t im p eda n ce 1 kΩ
D im e n sio ns Ø 30 m m x 38 m m height
Sp ect r al resp onse

2 .3 LPPAR0 1
The LPPAR01 probe m easures t he ratio bet ween t he num ber of
photons that st rike a surface in one second, in the 400
nm …700 nm spect ral range and the surface area ( m 2) . This
quant it y is defined as PAR: Ph ot osy nt h et ica lly Act iv e Ra dia -
t ion .
Ra diom e t r ic ch ar act e rist ics
The spect ral response curve of the LPPAR01 probe is shown in
the following graph:
The pr obe calibr at ion is carried out by using an halogen lam p, wit h a known spect ral
ir radiance in a specific spect ral range ( 400 nm …700 nm ) .
Te chn ica l spe cifica t ion s:
Ty pica l se n sit iv it y 30 μV/μmol·m- 2s- 1
M e a su r in g r an ge 0…5000 μmol·(m- 2s- 1 )
Sp ect r a l r an ge 400 nm …660 nm
Ca lib r a t ion a ccu r a cy < 6%
f2( co sin e r e sp on se / d ir e ct ion a l e r ro r) < 6%
Ope rat in g t e m pe rat u re 0…50° C
Ou t pu t im p eda n ce 1 kΩ
D im e n sio ns Ø 30 m m x 38 m m height
Sp ect r al resp onse

2 .4 LPU VA0 1
The LPUVA01 probe m easures ir radia n ce ( W/ m 2) defined as
t he rat io bet ween t he r adiant flux ( W) passing t hrough a sur-
face and the sur face area ( m 2) in the UVA ( 3 1 5 nm …4 0 0
nm ) spect ral range. Thanks t o a new t y pe of phot odiode,
LPUVA01 is blind t o visible and infrared light.
Ra diom e t r ic ch ar act e rist ics
The spectral response curve of the LPUVA01 probe is shown
in t he follow ing graph:
The calibrat ion is perform ed by reference t o our prim ary st andar d wit h m onochrom at ic
light at 365 nm obtained separat ing t he em ission line of a Xe-Hg lam p w it h an infer-
ential filt er. To get best per form ances from your LPUVA01 it is st rongly recom m ended
that t he calibrat ion be checked annually. The t em perature has a negligible influence
on the spect ral response of t he probe.
Te chn ica l spe cifica t ion s
Ty pica l se n sit iv it y 2.6 μV/μW/cm- 2
M e a su r in g r an ge 0…200 m W/ cm 2
Sp ect r a l r an ge peak at ≈360 nm and FWHM 60 nm
Ca lib r a t ion a ccu r a cy < 6%
Ope rat in g t e m pe rat u re 0…50° C
Ou t pu t im p eda n ce 1 kΩ
D im e n sio ns Ø 30 m m x 38 m m height
Sp ect r al resp onse

2 .5 LPUVB0 1
The LPUVB01 probe m easures irr a dia nce ( W/ m 2)
defined as t he r at io bet ween t he radiant flux ( W)
passing t hr ough a sur face and t he surface area ( m 2)
in t he UVB ( 2 8 0 nm …3 1 5 nm ) spe ct ral ran ge .
Thanks t o the use of a new type of phot odiode, the
LPUVB01 probe is blind to visible and infrar ed light .
Ra diom e t r ic ch ar act e rist ics
The spect ral response curve of t he LPUVB01 probe is
shown in t he following graph:
Pr obe calibrat ion is car ried out by using a 313 nm line of a Xe-Hg lam p, filt ered
t hr ough a special int erfer ent ial filt er. Measur em ent is car ried out by com par ison w it h
the prim ary st andards, assigned to Delt a OHM Metrological Laborat ory.
Te chn ica l spe cifica t ion s
Ty pica l se n sit iv it y 0.19 μV/(μW/cm2)
M e a su r in g r an ge 0…200 m W/ cm 2
Sp ect r a l r an ge peak at ≈305 nm and FWHM 31 nm
Ca lib r a t ion a ccuracy < 8%
Ope rat in g t e m pe rat u re 0…50° C
Ou t pu t im p eda n ce 2 kΩ
D im e n sio ns Ø 30 m m x 38 m m height
Sp ect r al resp onse

2 .6 LPU VC0 1
The LPUVC01 probe m easur es irr adiance ( W/ m 2) defined as
the ratio bet ween the radiant flux ( W) passing t hrough a sur-
face and t he surface area ( m2) in the UVC ( 2 0 0 n m …2 8 0
nm ) spectr al ra n ge. Thanks to t he use of a new t ype of pho-
todiode, the LPUVC01 probe is blind t o visible and infrared
light .
Ra diom e t r ic ch ar act e rist ics
The spect ral response curve of t he LPUVC01 probe is shown in
the following graph:
The pr obe calibr at ion is carried out by m easur ing irradiance com ing from an Hg lam p
at 254 nm .
Te chn ica l spe cifica t ion s
Ty pica l se n sit iv it y 0.25 μV/(μW/cm2)
M e a su r in g r an ge 0…200 m W/ cm 2
Sp ect r a l r an ge peak at 260 nm and FWHM 32 nm
Ca lib r a t ion a ccu r a cy < 10%
Ope rat in g t e m pe rat u re 0…50° C
Ou t pu t im p eda n ce 2 kΩ
D im e n sio ns Ø 30 m m x 38 m m height
Sp ect r al resp onse

3 I N STALLATI ON
Once t he inst allat ion place has been decided, t he connect ions bet ween t he probe and
the voltm eter should be provided; t he volt m et er should have pr oper scales of m eas-
urem ent.
3 .1 ELECTRI CAL CON N ECTI ON S
The electric signal of t he probes is m easured at t he ends of the resist ance which
short-circuit s t he t erm inals of the phot odiode. The phot ocurrent generat ed by t he
photodiode st ruck by t he light is converted int o a difference in potent ial. The wir ing
diagr am is show n in t he follow ing figur e.
To obt ain a reading precision of 1% of t he difference in potent ial at t he ends of the
resist ance, t he probe m ust be connect ed t o a digit al m ult im et er wit h input resist ance
> 100 kΩ
Ω
Photodiode
R=1k
-+

4 M EASUREM EN T
The pr obe out put m ust be read wit h a digital m ult im et er wit h int ernal resist ance
> 100kΩ. Connect t he probe t o t he reading inst rum ent as shown in t he previous chap-
ter.
Having m easured t he differ ence in pot ent ial ( DDP) at t he ends of t he pr obe, t he pho-
to-radiom et ric m easurem ent is giv en b y t he for m u la:
E = DDP/ S
where:
Eis the illum inance ( Klux) or ir radiance ( µW/ cm 2) or PAR µm ol / ( m 2s) according to t he
probe used
DDP is the difference in pot ent ial expressed in m V m easured by t he m ult im et er,
Sis t he calibr at ion fact or m ar ked on t he probe in m V/ klux or µV/ ( µW/ cm 2) or
µV/ ( µm ol/ ( m 2s) ) , according t o the pr obe used.
N ot e f or LPUVA0 1 , LPUVB0 1 a n d LPUVC0 1
At t he m om ent no int ernational agreem ent exist for the calibrat ion of this kind of ra-
diom et er , so t he calibrat ion coefficient is dependent fr om t he calibrat ion procedur e
lik e r eport ed in t he follow ing ar t icle:
“Source of Error in UV Radiat ion Measurem ent s “ , T. C. Larason, C. L. Crom er on
“Journal of Reaserch of t he Nat ional I nst it ute of St andards and Technology” Vol. 106,
Num . 4, 2001. ( The article is free on t he NI ST’s WEB site at t he following address :
htt ps: / / nvlpubs.nist .gov/ nist pubs/ j res/ 106/ 4/ j 64lar.pdf)

5 SAFETY I N STRUCTI ON S
Ge ne ra l sa fe t y in st r uct ions
The probes have been m anufactured and t est ed in accordance wit h the safety st and-
ard EN61010-1: 2010 “ Safet y requirem ent s for elect r ical equipm ent for m easurem ent ,
cont rol and labor at or y use” and has left t he fact ory in per fect safet y t echnical condi-
t ion s.
The probes proper operat ion and operating safety can be ensured only if all st andard
safet y m easures as well as t he specific m easures described in t his m anual are fol-
lowed.
The probes proper oper at ion an d oper at ing safet y can be ensur ed only in t he clim at ic
condit ions specified in t his m an ual.
Do not use the probes in places where there are:
•Corrosive or flam m able gases.
•Dir ect v ibrat ions or shocks to t he inst rum ent .
•High-int ensit y elect rom agnet ic fields, st at ic elect ricit y.
Use r ob liga t ion s
The probe oper at or shall follow t he dir ect ives and regulat ions below t hat refer t o t he
t reat m ent of dangerous m at erials:
•EEC dir ect iv es on w or kplace safet y.
•Nat ional law regulat ions on w or kplace safet y.
•Accident prev ent ion r egulat ions.

6 ORD ERI NG CODES
LPPH OT0 1 Phot om etric probe for m easuring I LLUMI NANCE, CI E photopic fil-
ter, diffuser for cosine correct ion. Out put in m Vdc per klux, cable
L= 5 m .
LPRAD0 1 Radiom et ric pr obe for m easuring I RRADI ANCE, diffuser for cosine
correction. Output in μV / μWcm- 2, cable L= 5 m .
LPPAR0 1 Radiom et ric probe for m easuring PHOTONS FLOW ( light flow in
the field of phot osynt hesis of chlorophyll) . Cosine correction. Out -
put in μV/μmol m-2s- 1, cable L= 5 m .
LPUVA0 1 Radiom et ric probe for m easuring I RRADI ANCE in t he UVA
(315…400 nm). Output in μV/μWcm- 2, cable L= 5 m .
LPUVB0 1 Radiom et ric probe for m easuring I RRADI ANCE in t he UVB
(280…315 nm). Output in μV/μWcm- 2, cable L= 5 m .
LPU VC0 1 Radiom et ric pr obe for m easur ing I RRADI ANCE in t he UVC
(220…280 nm). Output in μV/μWcm-2, cable L= 5 m .
LPBL Base wit h levelling device.
DELTA OH M m e t r olog y la bor a t or ie s LAT N ° 1 2 4 a re I SO/ I EC 1 7 0 2 5 a ccr e dit e d b y
ACCRED I A f or Te m p er at u re , H um id it y , P re ssur e , Phot om e t r y / Ra diom e t ry , Aco us-
t ics a n d Air Ve locit y . Th ey ca n su pp ly ca lib r at ion ce r t if ica t e s f or t h e a ccr e dit e d
qu an t it ie s.

GHM GROUP – D elt a OH M | Delt a Ohm S.r .l. a socio unico
Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | I TALY
Phone + 39 049 8977150 | Fax + 39 049 635596
ww w.delt aohm .com | sales@delt aohm . com
W ARRAN T Y
Delt a OHM is r equir ed t o r espond t o t he " fact ory w arr ant y" only in t hose cases provided by
Legislat ive Decr ee 6 Sept em ber 2005 - n. 206. Each inst rum ent is sold after rigorou s inspect ion s;
if any m anufact ur ing defect is found, it is necessar y t o cont act t he dist ribut or wher e the
in st rum ent w as pu rch ased fr om . Dur ing t h e w ar ran t y p er iod ( 24 m ont h s f rom t he dat e of inv oice)
any m anufact uring defect s found will be r epaired fr ee of charge. Misuse, w ear , neglect , lack or
inefficient m aint enance as well as t heft and dam age during t ransport ar e excluded. Warr ant y does
not apply if changes, t am per ing or unau thorized r epair s ar e m ade on t he pr oduct . Solutions,
pr obes, elect r od es and m icrophon es ar e not gu aran t eed as t he im pr oper use, even for a few
m inut es, m ay cause ir reparable dam ages.
Delt a OHM r ep air s t he p rod uct s t hat sh ow defect s of con st ruct ion in accordance with t h e t er m s and
condit ion s of warr ant y in cluded in th e m anual of t he pr oduct . For an y disput e, t h e com p et ent cou rt
is the Court of Padua. The I t alian law and t h e “ Con vent ion on Con t ract s f or t h e I nt er nat ion al Sales
of Goods” apply.
TECH N I CAL I N FORM ATI ON
The qualit y level of our inst rum ent s is t he result of t he cont inuous product developm ent . This m ay
lead t o dif fer ences b et w een t h e in for m at ion r ep or t ed in t h e m an ual and t h e in st r um en t y ou h av e
purch ased. I n case of discr epancies and/ or incon sist en cies, please w rit e t o sales@delt aohm .com .
Delt a OHM r eserv es t he r igh t t o change t ech nical specificat ions and dim en sions t o fit t he
pr oduct r equirem ent s w it hout prior not ice.
DI SPOSAL I N FORM ATI ON
Elect rical and elect ronic equipm ent m arked wit h specific sym bol
in com pliance
wit h 2012/ 19/ EU Direct ive m ust be disposed of separat ely from h ouseh old w ast e.
Eur opean users can hand them ov er t o t he dealer or t o t he m anufact urer w hen
purchasing a
new elect rical and elect r onic equipm en t , or t o a WEEE collect ion
point designat ed by local aut horit ies. I llegal disposal is punished by law.
Disposing of elect rical and elect r onic equipm en t separ at ely fr om norm al wast e h elps t o
preserve nat ural resources and allows m at erials t o be recycled in an environm entally friendly
way without risks t o hum an healt h.
V2 .0
2 8 / 0 5 / 2 0 2 1