Delta OHM LPPYRHE16 Manual de usuario

Operating manual

Pyranometer

LPPYRHE16

www.deltaohm.com

English

Keep for future reference.

LPPYRHE16 -2-V2.3

TABLE OF CONTENTS

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

2WORKING PRINCIPLE........................................................................................... 4

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

4ELECTRICAL CONNECTIONS.................................................................................. 8

4.1 LPPYRHE16 CONNECTIONS.................................................................................... 8

4.2 LPPYRHE16AC CONNECTIONS................................................................................ 9

4.3 LPPYRHE16AV CONNECTIONS................................................................................ 9

4.4 LPPYRHE16S CONNECTIONS................................................................................ 10

4.5 LPPYRHE16ACS CONNECTIONS............................................................................ 11

5MEASUREMENT IN THE MODELS WITH ANALOG OUTPUT.................................... 12

5.1 LPPYRHE16 ................................................................................................... 12

5.2 LPPYRHE16AC[S]........................................................................................... 12

5.3 LPPYRHE16AV ............................................................................................... 12

6RS485 MODBUS-RTU OUTPUT............................................................................. 13

6.1 SETTING THE COMMUNICATION PARAMETERS............................................................... 13

6.2 READING THE MEASURES WITH THE MODBUS-RTU PROTOCOL .......................................... 15

7TECHNICAL SPECIFICATIONS............................................................................. 16

8MAINTENANCE.................................................................................................... 17

9SAFETY INSTRUCTIONS...................................................................................... 17

10 ACCESSORIES ORDERING CODES ....................................................................... 18

LPPYRHE16 -3-V2.3

1INTRODUCTION

The pyrheliometer LPPYRHE16 measure the direct solar irradiance (W/m2).

The receiving surface must be positioned perpendicularly to sun’s rays, via a solar

tracker or else.

LPPYRHE16 is a B class pyrheliometer in accordance with ISO 9060:2018 standard

and with the criteria of the WMO “Guide to Meteorological Instruments and Methods of

Observation’”, seventh edition (2008).

The pyrheliometer has a field of view of 5°, in accordance with ISO 9060:2018 stand-

ard and WMO guide.

The pyrheliometer is available in the following versions:

•LPPYRHE16: PASSIVE.

•LPPYRHE16AC: ACTIVE with 4..20 mA CURRENT output (0…2000 W/m2).

•LPPYRHE16ACS: ACTIVE with 4..20 mA CURRENT output (0…2000 W/m2) and

RS485 Modbus-RTU output.

•LPPYRHE16AV: ACTIVE with 0..1 or 0..5 or 0..10 V VOLTAGE output (0…2000

W/m2) to be defined when ordering.

•LPPYRHE16S: With RS485 Modbus-RTU output.

The pyrheliometer is supplied factory calibrated and with a calibration report.

LPPYRHE16 -4-V2.3

2WORKING PRINCIPLE

The pyrheliometer LPPYRHE16 is based on a passive thermopile sensor. The sensitive

surface of the thermopile is coated with a matt black paint, which makes the pyrheli-

ometer not selective to the different wave lengths. The spectral range of the pyrheli-

ometer is determined by the transmission of the quartz window, whose function is to

protect the sensor from dust and water. A special quartz allows to perform a non-

selective measurement from 200 nm to 4000 nm.

The adopted sensor allows the response time to be lower than ISO 9060:2018 re-

quirements for the classification of class B pyrheliometers (the response time is un-

der 9 seconds while the standard requires a response time lower than 15 seconds).

Radiant energy is absorbed by the blackened surface of the thermopile, thus creat-

ing a difference in temperature between the hot junction and the body of the pyr-

heliometer, which acts in this case as a cold junction. Thanks to the Seebeck effect,

the difference in temperature between hot and cold junction is converted into a Dif-

ference of Potential.

In order to reduce the variations of sensitivity depending on temperature and to fall

within the specifications requested to a class B pyrheliometer, LPPYRHE16 is pro-

vided with a passive compensation circuit. Figure 2.1 shows the typical variation of

sensitivity at different temperatures. Deviations are calculated starting from sensi-

tivity measured at 20 °C.

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

-30 -20 -10 010 20 30 40 50 60

Temperatura (C°)

Variazione % della sensibilità

Fig. 2.1: % variation of sensitivity of the LPPYRHE16 pyrheliometer with regard

to sensitivity at 20 °C in the temperature range from -20 to 50 °C

LPPYRHE16 is a sealed instrument, for that reason a cartridge of silica-gel crystals is

provided to absorb humidity inside the instrument, in order to prevent condensation

from forming on the quartz window of the instrument, invalidating the performed

measurements.

In accordance with WMO regulations, the angular field of view is 5° and the slope an-

gle is 1° (figure 1).

% sensitivity variation

Temperature (°C)

LPPYRHE16 -5-V2.3

Fig. 2.2: field of view and slope angle

A light shield can be insert, in order to reduce light scattering contribution.

Fig. 2.3: scheme of principle LPPYRHE16 (version with mV output)

Front opening

Internal opening

Sensor

Field of view = 2 * arctan (R/d)

Slope angle = arctan [(R-r)/d]

Thermopile

Surge

Protector

Connector pins

Housing

To cable shield

Temperature

compensation

LPPYRHE16 -6-V2.3

3INSTALLATION

Before installing the pyrheliometer, refill the cartridge containing silica-gel crystals.

Silica gel absorbs humidity inside the instrument and prevents, in particular climatic

conditions, condensation on the internal wall of the quartz window and measurement

alteration.

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. Unscrew the silica gel cartridge using a coin.

2. Remove the cartridge perforated cap.

3. Open the sachet containing silica gel (supplied with the pyrheliometer).

4. Fill the cartridge with the silica gel crystals.

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

properly positioned.

6. Screw the cartridge to the pyrheliometer body using a coin.

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

8. The pyrheliometer 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

LPPYRHE16 -7-V2.3

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

the quartz window regularly and carry out maintenance. At the same time, make

sure that no buildings, constructions, trees or obstructions intercept the sun’s path

during the day all year long.

•To point the pyrheliometer, the two holes in the front and back flange are used. To

properly align the instrument, just make sure that the sun’s beams that pass

through the first hole (on the front flange of the pyrheliometer) reach the second

hole (on the back flange).

•

Fig. 3.2: description and dimensions in mm

Alignment holes

Silica-gel

cartridge

LPPYRHE16 -8-V2.3

4ELECTRICAL CONNECTIONS

LPPYRHE16, LPPYRHE16AC and LPPYRHE16AV have a 4-pole connector and use

the CPM12AA4... optional cables.

LPPYRHE16S and LPPYRHE16ACS have a 8-pole connector. LPPYRHE16S uses the

CPM12-8D... optional cables, while LPPYRHE16ACSuses the CPM12-8DA... op-

tional cables.

The metallic housing of the pyrheliometer 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

pyrheliometer, connect the wire of the cable corresponding to

the housing to ground ( ).

In the powered versions, internally there are surge protection devices connected to the

housing. Grounding the housing allows the correct protection functionality, in particular

against lightning.

4.1 LPPYRHE16 CONNECTIONS

The pyrheliometer LPPYRHE16 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

pyranometer output signal does not exceed 20 mV. In order to better exploit the pyr-

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

Connector Function Color

Vout (+)

Red

Vout (-)

Blue

Housing (C)

White

Cable shield (SH)

Black

Fig. 4.1: LPPYRHE16 connections

CPM12AA4… cable

Sensor M12

male connector

Datalogger or

converter/amplifier

with Vor mA output

Connect to ground only if it is not possible to

ground locally the housing of the pyr

heliometer

LPPYRHE16 -9-V2.3

4.2 LPPYRHE16AC CONNECTIONS

The pyrheliometer LPPYRHE16AC has 4…20 mA output and requires 10…30 Vdc ex-

ternal power supply. It is to be connected to a power supply and an instrument with

4…20 mA input as shown in fig. 4.2. The load resistance of the instrument reading the

signal must be ≤500 Ω.

Connector Function Color

Positive (Iin)

Red

Negative (Iout)

Blue

Housing (C)

White

Cable shield (SH)

Black

Fig. 4.2: LPPYRHE16AC connections

4.3 LPPYRHE16AV CONNECTIONS

The pyrheliometer LPPYRHE16AV has 0…1 V, 0…5 V or 0…10 V output (depending

on the ordered output) and requires external power supply: 10…30 Vdc for 0…1 V

and 0…5 V outputs, 15…30 Vdc for 0…10 V output. It is to be connected to a power

supply and an instrument with voltage input as shown in fig. 4.3. The load resistance

of the instrument reading the signal must be ≥100 kΩ.

Connector Function Color

Output positive (+Vout)

Red

Output negative

Power supply negative (GND)

Blue

Power supply positive (+Vdc)

White

Cable shield (SH)

Black

Fig. 4.3: LPPYRHE16AV connections

CPM12AA4… cable

Sensor M12

male connector

Power supply

Connect to ground only if it is not possible to

ground locally the housing of the pyr

heliometer

Instrument with

4…20 mA input

CPM12AA4… cable

Sensor M12

male connector

Power supply

Instrument

with

voltage input

LPPYRHE16 -10 -V2.3

4.4 LPPYRHE16SCONNECTIONS

The pyrheliometer LPPYRHE16S has RS485 Modbus-RTU output and requires

5…30 Vdc external power supply. It is to be connected to a power supply and to a

PLC, a data logger or a RS485/USB or RS485/RS232 converter for PC as shown in fig.

4.4. The RS485 output is not isolated.

Connector Function Color

Power supply negative (GND)

Blue

Power supply positive (+Vdc)

Red

Not connected

RS485 A/-

Brown

RS485 B/+

White

Housing / Cable shield (SH)

Black

Not connected

Fig. 4.4: LPPYRHE16S connections

Before connecting the pyrheliometer to the RS485 network, set the address and the

communication parameters, if different from the factory preset (see chapter 6).

Power supply

CPM12-8D… cable

Sensor M12

male connector

PLC, data logger or

RS485/USB or

RS485/RS232

converter for PC

Other sensors with

RS485 output

Connect to ground only if it is not possible to

ground locally the housing of the pyr

heliometer

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