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