GHM DeltaOHM LPPHOT02 Manuale utente

Operating manual

Photometric probe

LPPHOT02

ww.deltaohm.com

English

Keep for future reference.

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TABLE OF CONTENTS

INTRODUCTION .................................................................................................... 3

WORKING RINCI LE ........................................................................................... 4

INSTALLATION ..................................................................................................... 5

ELECTRICAL CONNECTIONS .................................................................................. 8

4.1

LPPHOT02

CONNECTIONS

..................................................................................... 8

4.2

LPPHOT02AC

CONNECTIONS

................................................................................. 9

4.3

LPPHOT02AV

CONNECTIONS

................................................................................. 9

MEASUREMENT ................................................................................................... 10

5.1

LPPHOT02 ..................................................................................................... 10

5.2

LPPHOT02AC ................................................................................................. 10

5.3

LPPHOT02AV ................................................................................................. 10

MAINTENANCE .................................................................................................... 11

TECHNICAL S ECIFICATIONS ............................................................................. 12

SAFETY INSTRUCTIONS ...................................................................................... 13

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

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'

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

+Vout

-Vout

Fig. 4.1: L HOT02 connections

PM12AA

…

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

34SH

Iin

Iout

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

GND

+Vdc

+Vout

Fig. 4.3: L HOT02AV connections

CPM12AA

…

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

…

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

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 :

= DDP / S

where:

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

is obt ined by me suring with multimeter the current I

out

bsorbed

by the sensor nd pplying the following formul :

= 9.375

•

out

– 4mA)

where:

is the illumin nce expressed in klux;

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

is obt ined by me suring with multimeter the output volt ge V

out

the sensor nd pplying the following formul :

= 150

•

out

for the version 0…1 V

= 30

•

out

for the version 0…5 V

= 15

•

out

for the version 0…10 V

where:

is the illumin nce expressed in klux;

out

is the output volt ge expressed in V me sured by the multimeter.

Indice

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