GHM DeltaOHM LPPYRA10 Manual de usuario

Operating manual

Pyranometer

LPPYRA10

www.deltaohm.com

English

Keep for future reference.

LPPYRA10 - 2 - V2.6

TABLE OF CONTENTS

1 INTRODUCTION .................................................................................................... 3

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

3 INSTALLATION ..................................................................................................... 6

4 ELECTRICAL CONNECTIONS ................................................................................ 10

4.1 LPPYRA10 CONNECTIONS ................................................................................... 10

4.2 LPPYRA10AC[4] CONNECTIONS ........................................................................... 11

4.3 LPPYRA10AV[4] CONNECTIONS ........................................................................... 11

4.4 LPPYRA10S CONNECTIONS .................................................................................. 12

4.5 LPPYRA10S12 CONNECTIONS .............................................................................. 13

4.6 LPPYRA10ACS[4] CONNECTIONS ......................................................................... 14

5 MEASUREMENT IN THE MODELS WITH ANALOG OUT UT .................................... 15

5.1 LPPYRA10 ..................................................................................................... 15

5.2 LPPYRA10AC[S][4] ........................................................................................ 15

5.3 LPPYRA10AV[4] ............................................................................................. 15

6 RS485 MODBUS-RTU OUT UT ............................................................................. 16

6.1 SETTING THE COMMUNICATION PARAMETERS ............................................................... 16

6.2 READING THE MEASURES WITH THE MOD US-RTU PROTOCOL .......................................... 18

7 SDI-12 OUT UT .................................................................................................. 19

8 MAINTENANCE .................................................................................................... 23

9 TECHNICAL S ECIFICATIONS ............................................................................. 24

10 SAFETY INSTRUCTIONS ...................................................................................... 25

11 ACCESSORIES ORDERING CODES ....................................................................... 26

LPPYRA10 - 3 - V2.6

1 INTRODUCTION

LPPYRA10 pyranometer measures the irradiance on a flat surface (W/m2). The meas-

ured irradiance (Global Irradiance) is the sum of direct solar irradiance and diffuse ir-

radiance.

LPPYRA10 is a Spectrally Flat Class A (Secondary Standard) pyranometer in accord-

ance with ISO 9060:2018 and with the criteria of the WMO “Guide to Meteorological

Instruments and Methods of Observation”.

The pyranometer is available in the following versions:

•L YRA10: PASSIVE.

The passive version can be connected to the instruments

D09847 and HD31 by using VP 472 SICRAM module.

•L YRA10AC: ACTIVE with 4..20 mA CURRENT output (0…2000 W/m2).

•L YRA10AC4: ACTIVE with 4..20 mA CURRENT output (0…4000 W/m2).

•L YRA10ACS: ACTIVE with 4..20 mA CURRENT output (0…2000 W/m2) and

RS485 Modbus-RTU output.

•L YRA10ACS4: ACTIVE with 4..20 mA CURRENT output (0…4000 W/m2) and

RS485 Modbus-RTU output.

•L YRA10AV: ACTIVE with 0..1 or 0..5 or 0..10 V VOLTAGE output (0…2000

W/m2) to be defined when ordering.

•L YRA10AV4: ACTIVE with 0..1 or 0..5 or 0..10 V VOLTAGE output (0…4000

W/m2) to be defined when ordering.

•L YRA10S: With RS485 Modbus-RTU output.

•L YRA10S12: With SDI-12 output.

The pyranometer is supplied factory calibrated and with a calibration report. The cali-

bration is carried out in accordance with the ISO 9847:1992 (type IIc) standard: ”Cal-

ibration of field pyranometers by comparison to a reference pyranometer”. The pyra-

nometer is calibrated by comparison with the reference sample calibrated annually at

WRC (World Radiation Center).

LPPYRA10 - 4 - V2.6

2WORKING RINCI LE

LPPYRA10 pyranometer is based on a thermopile sensor. The thermopile sensitive sur-

face is coated with a black matt paint, which allows the pyranometer not to be selec-

tive at different wavelengths.

In order to grant the thermopile a proper thermal insulation from the wind and reduce

the sensitivity to thermal irradiance, LPPYRA10 is equipped with two concentric domes

having 50 mm and 32 mm outer diameter. The domes protect the thermopile from the

dust, which might change spectral sensitivity if it lies on the black surface,

The pyranometer spectral range is determined by the transmission of the two glass

domes. Thanks to the use of a new material for the manufacturing of the domes, the

spectral range has been further extended to short wavelengths starting from 283 nm.

Considering a standard solar spectrum, the portion of solar irradiation measured by

the pyranometer is greater than 99.8%. Figure 2.1 shows the relative spectral sensi-

tivity of the LPPYRA10 pyranometer and a standard solar spectrum.

Fig. 2.1: L YRA10 pyranometer relative spectral sensitivity (blue line) com-

pared with a standard solar spectrum (red line)

Radiant energy is absorbed by the thermopile black surface, thus creating a difference

of temperature between the center of the thermopile (hot junction) and the pyranom-

eter body (cold junction). Thanks to the Seebeck effect, the difference of temperature

between hot and cold junction is converted into a Difference of Potential.

A second thermopile, not accessible by light, is mounted inside the instrument. This

second thermopile, connected in anti-series with respect to the sensor exposed to

light, reduces the signals due to sudden temperature changes of the pyranometer

(thermal shocks).

In order to minimize sensitivity changes with temperature, LPPYRA10 is equipped with

a passive compensation circuit. The graph in figure 2.2 shows the typical variation of

sensitivity at different temperatures. The deviations are calculated from the sensitivity

measured at 20 °C.

LPPYRA10 - 5 - V2.6

Fig. 2.2: : percentage change of L YRA10 pyranometer sensitivity in the

temperature range -20…50 °C compared to the sensitivity at 20 °C

To prevent internal condensation forming on the internal side of the dome under cer-

tain climatic conditions, silica gel tablets are inserted inside the pyranometer to ab-

sorb humidity.

Fig. 2.3: scheme of principle L YRA10 (version with mV output)

ermopil

Surge

Protector

Connector pins

Housing

To cable shield

Temperature (°C)

% change of sensitivity

ermopil

Temperature

compensation

LPPYRA10 - 6 - V2.6

3INSTALLATION

efore installing the pyranometer, refill the cartridge containing silica-gel crystals. Sil-

ica gel absorbs humidity in the dome chamber and prevents, in particular climatic

conditions, condensation on the internal walls of the domes and measurement altera-

tion.

Do not touch the silica gel crystals with your hands while refilling the cartridge. Carry

out the following instructions in an environment as drier as possible:

1. Loosen the three screws that fix the white shade disk.

2. Unscrew the silica gel cartridge using a coin.

3. Remove the cartridge perforated cap.

4. Open the sachet containing silica gel (supplied with the pyranometer).

5. Fill the cartridge with the silica gel crystals.

6. Close the cartridge with its own cap, paying attention that the sealing O-ring be

properly positioned.

7. Screw the cartridge to the pyranometer body using a coin.

8. Check that the cartridge is screwed tightly (if not, silica gel life will be reduced).

9. Position the shade disk and screw it with the screws.

10. The pyranometer is ready for use.

The figure below shows the operations necessary to fill the cartridge with the silica gel

crystals.

Fig. 3.1: filling the silica-gel cartridge

Silica

gel

cartridge

Perforated cap

Sealed sachet

of silica-gel crystals

Filling Closing the cartridge

LPPYRA10 - 7 - V2.6

•The pyranometer must be mounted in an easy-to-reach location in order to clean

the dome regularly and carry out maintenance. At the same time, make sure that

no buildings, constructions, trees or obstructions exceed the horizontal plane where

the pyranometer lies. If this is not possible, select a site where obstructions in the

path of the sun from sunrise to sunset do not exceed 5 degrees of elevation. N.B.:

The presence of obstructions on the horizon line affects significantly the

measurement of direct irradiance.

•The pyranometer must be located far from any kind of obstruction, which might re-

flect sunlight (or sun shadow) onto the pyranometer itself.

•In compliance with ISO TR9901 standard and WMO recommendations, when the

pyranometer is used without the white shade disk, it must be positioned so that its

connector is pointed to the North Pole, if the instrument is used in the Northern

Hemisphere, and to the South Pole, if used in the Southern Hemisphere. In any

case, it is better to follow this suggestion even when the shade disk is applied.

•For fixing, use the holes on the pyranometer body (remove the shade disk to ac-

cess the holes and reposition it after mounting) or the suitable accessories (see the

figures below). In order to allow an accurate horizontal positioning, the pyranome-

ter is equipped with a levelling device: the adjustment is made by means of the two

levelling screws that allow adjusting the pyranometer inclination. The mast height

does not exceed the pyranometer plane to avoid measurement errors caused by

any reflection or shadow of the mast itself.

•It is preferably to thermally insulate the pyranometer from its mounting bracket

ensuring, at the same time, a good electrical contact to ground.

Fig. 3.2: fixing holes and levelling device

Fixing holes ∅ 6 mm

Levelling

device

LPPYRA10 - 8 - V2.6

HD2003.79K

HD2003.77C

HD2003.83

HD2003.83.1

HD2003.85K

HD9007

LPPYRA10

HD9007T29.1

TP32MTT.03.C

80° MAX

int.

M37 x 2

Fig. 3.3: fixing accessories

A = Palo 75 mm

B = Raccordo di base

C = Piastra di supporto graduata

D = Staffa per piranometro

LPPYRA10 - 9 - V2.6

Fig. 3.4: fixing accessories

LPPYRA10 - 10 - V2.6

4ELECTRICAL CONNECTIONS

L YRA10, L YRA10AC[4] and L YRA10AV[4] have a 4-pole connector and use

the C M12AA4... optional cables, with 4-pole connector on one side and open wires

on the other side.

L YRA10S and L YRA10S12 have a 8-pole connector and use the C M12-8D...

optional cables, with 8-pole connector on one side and open wires on the other side.

L YRA10ACS[4] has a 8-pole connector and uses the C M12-8DA... optional ca-

bles, with 8-pole connector on one side and open wires on the other side.

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: in LPPYRA10AV[4] the housing is not

connected to the connector.

Inside the housing there is a surge protector connected between the

housing itself and the electronic circuit (powered models) or the ca-

ble shield (passive model). Grounding the housing allows the correct

protection function (in particular against lightning) of the surge pro-

tector.

4.1 L YRA10 CONNECTIONS

The pyranometer LPPYRA10 is passive and does not require power supply. It is to be

connected either to a millivoltmeter or to a data acquisition system. Typically, the py-

ranometer output signal does not exceed 20 mV. In order to better exploit the pyra-

nometer features, the readout instrument should have 1 µV resolution.

Connector Function Color

1 +Vout Red

2 -Vout lue

3 Housing (C) White

4 Cable shield (SH) lack

+Vout

-Vout

Fig. 4.1: L YRA10 connections

CPM12AA4… cable

Pyranometer M12

male connector

Datalogger or

converter/amplifier

with V or mA output

Connect to ground only if it is not possible to

ground locally the housing of the pyranometer

To circuit

Housing

Surge

protector

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