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Introduction

16131.5 digital pyranometer series is a range of high-accuracy digital solar radiation sensors. It is “first

class” according to the WMO guide and ISO 9060:1990 standard and “Spectrally Flat Class B” in the

2018 revision. Version 00.16131.501030, equipped with an on-board heater, is compliant in its

standard configuration with the requirements for “Class B” PV monitoring systems of the IEC 61724-

1:2017 standard.

The 16131.5 measures the solar radiation received by a plane surface, in W/m

, from a 180° field of

view angle. Various outputs are available, both digital and analogue, for ease of integration.

•

Version 00.16131.501030:

digital sensor with Modbus over RS-485 output and heater

•

Version 00.16131.501040:

digital sensor with Modbus over TTL (on request) and analogue 4-20 mA output (without

heater)

•

Version 00.16131.501000: passive sensor with analogue millivolt output and heater

Benefits of the 16131.5 series:

•

best measurement accuracy in first class

•

improved response time

•

with 00.16131.501030’s on-board heater: compliant with IEC 61724-1 Class B in its standard

configuration

Using the analogue version 00.16131.501000 is easy: the pyranometer can be connected directly to

commonly used data logging systems. The irradiance in W/m

is calculated by dividing the signal output, a

small voltage, by the sensitivity. This sensitivity is provided with 00.16134.501000 on its calibration

certificate.

The central equation governing 00.16131.501000 is:

E = U/S

U: Voltage output in V

S: Sensitivity in V/(W/m

)

E: Solar irradiance in W/m

Suggested use

Suggested use for 16131.5:

•

PV system performance monitoring

•

general solar resource monitoring

•

indoor simulated solar testing

•

meteorological networks

Содержание 16131.5 Series

Страница 1: ...Manual 16131 5 SERIES First class pyranometers with various outputs and heater ...

Страница 2: ...r responsible safety representative 3 Use the system only as described in the manual 4 Always have the manual at hand at the installation site 5 Use the system within the specified operating condition Eliminate influences which might impair the safety 6 Prevent the ingress of unwanted liquids into the devices Please note the loss that unauthorised manipulation of the system shall result in the los...

Страница 3: ...0 16131 501030 and 00 16131 0501000 16 4 8 Using 00 16131 501040 s analogue 4 to 20 mA output 17 4 9 Data acquisition requirements for using 00 16131 501000 s millivolt output 18 4 10 Connecting to an RS 485 network 19 5 Communication with 16131 5 20 5 1 Modbus protocol 20 5 2 Data encoding 20 5 3 Device address 20 5 4 Standard configuration default 20 5 5 Modbus command set 21 5 6 Measured value ...

Страница 4: ...r TTL on request and analogue 4 20 mA output without heater Version 00 16131 501000 passive sensor with analogue millivolt output and heater Benefits of the 16131 5 series best measurement accuracy in first class improved response time with 00 16131 501030 s on board heater compliant with IEC 61724 1 Class B in its standard configuration Using the analogue version 00 16131 501000 is easy the pyran...

Страница 5: ...ometer 16131 5 sun screen cable of the length as ordered product certificate matching the instrument serial number including o calibration certificate any other options as ordered Please store the certificates in a safe place 1 3 Quick instrument check 1 At power ON the signal may have a temporary output level different from zero an offset Let this offset settle down it is a normal part of the pow...

Страница 6: ...hermal sensor with black coating 9 quick release system of sun screen 10 instrument body 11 levelling feet The 16131 5 pyranometer series employs a state of the art thermopile sensor with black coated surface two domes and an anodised aluminium body Version 00 16131 501030 offers irradiance in W m2 as a digital output It must be used in combination with suitable power supply and a data acquisition...

Страница 7: ...sed data logging systems In order to reduce the effect of dew deposition and frost on the outer dome surface 00 16131 501000 has a built in heater The heater is coupled to the sensor body Heating a pyrometer can generate additional irradiance offset signals therefore it is recommended to activate the heater only during night time Combining a heater with external ventilation makes these heating off...

Страница 8: ...m2 Non stability 1 change per year Non linearity 1 100 to 1000 W m2 Directional response 20 W m2 Spectral selectivity 3 0 35 to 1 5 x 10 6 m Temperature response 2 30 to 50 C Tilt response 2 0 to 90 at 1000 W m2 Measurement range 0 to 3000 W m2 Zero offset steady state 1 W m2 40 to 80 C Spectral range 20 transmission points 285 to 3000 x 10 9 m Figure 3 1 1 Spectral response of the pyranometer com...

Страница 9: ...46 and ISO 9847 applying a correction to reference conditions Calibration method indoor calibration according to ISO 9847 Type IIc Calibration uncertainty 1 8 k 2 Recommended recalibration interval 2 years Reference conditions 20 C normal incidence solar radiation horizontal mounting irradiance level 1000 W m2 Validity of calibration based on experience the instrument sensitivity will not change d...

Страница 10: ...ed 00 16131 501000 ANALOGUE mV Millivolt mV output irradiance in W m2 Sensitivity range 7 to 15 x 10 6 V W m2 Sensitivity nominal 10 x 10 6 V W m2 Expected voltage output application under natural solar radiation 0 1 to 30 x 10 3 V Measurement function required programming E U S U Voltage output in V S Sensitivity in V W m2 E Solar irradiance in W m2 Irradiance resolution depends on readout equipm...

Страница 11: ...11 3 2 Dimensions of 16131 5 Figure 3 2 1 Dimensions of 16131 5 in x 10 3 m 95 Ø 92 M6 Ø 68 46 M5 2x ...

Страница 12: ...g a representative measurement The pyranometer measures the solar radiation in the plane of the sensor Some installations require a tilted or inverted position The sensor bottom plate parallel to the black sensor surface should be mounted parallel to the plane of interest In case a pyranometer is not mounted horizontally or in case the horizon is obstructed the representativeness of the location b...

Страница 13: ...screen The bottom of the handle can be pulled out gently Once the handle is pulled out and fully released as shown in the figure below the sun screen can be lifted off manually for removal Installing the sun screen pull out the bottom of the quick release system handle so it is fully released place the screen on 16131 5 and once it is positioned properly press the handle of the quick release syste...

Страница 14: ...ned mounting as an example The whole pattern for mounting the 16131 5 is the same for all the sets mentioned above Figure 4 3 1 Mounting of 16131 5 on Set for inclined mounting on traverse system 14627 1 16131 5 pyranometer 2 mounting plate for pyranometer 3 fixation for mounting on traverse system 14627 4 TORX M4 x 16 TX20 DIN 7985 TX A2 5 washer 4 3 DIN 125 A A2 6 washer 5 3 DIN 125 A A2 7 hexag...

Страница 15: ...S 485 B B 4 Black RS 485 A A 5 Grey heater Shield mesh shield Note 1 At the connector end of the cable the shield is connected to the connector housing Note 2 The heater is powered by applying a voltage to the grey wire an operating voltage of 12 VDC is used Note 3 Do not put more than 30 Volt across these wires this will damage the sensor 4 4 2 Wiring diagram 00 16131 501040 Modbus RTU Table 4 4 ...

Страница 16: ...local ground at the cable end This is typically the ground or low voltage of the power supply or the common of the network In exceptional cases for instance when both the instrument and a datalogger are connected to a small size mast the local ground at the mounting platform is the same as the network ground In such cases ground connection may be made both to the instrument body and to the shield ...

Страница 17: ... transmitter output current I The transmitted range which is the irradiance at output current of 20 x 10 3 A and is typically 1600 W m2 It is important to realise that the signal wires not only act to transmit the signal but also act as power supply for the 4 20 mA current loop circuit Figure 4 8 1 Electrical diagram of the connection of 00 16131 501040 to a typical ampere meter or datalogger with...

Страница 18: ... measure small voltage signals preferably 5 x 10 6 V uncertainty minimum requirement 20 x 10 6 V uncertainty valid for the entire expected temperature range of the acquisition amplification equipment Capability for the data logger or the software to store data and to perform division by the sensitivity to calculate the solar irradiance E U S Data acquisition input resistance 1 x 106 Ω Open circuit...

Страница 19: ...us org After the last nodes in the network on both sides line termination resistors LT are required to eliminate reflections in the network According to the RS 485 standard these LT have a typical value of 120 to 150 Ω Never place more than two LT on the network and never place the LT on a derivation cable To minimise noise on the network when no transmission is occurring a pull up and pull down r...

Страница 20: ...234 is transmitted in the order 0x12 0x34 Example big endian 32bit or 64bit Register size value 32 Bits 0x12345678 is transmitted in the order 0x12 0x34 0x56 0x78 5 3 Device address The addresses 1 247 are permitted for Modbus Warning Using the same Modbus address for more than one device will lead to irregular behaviour of the entire network 5 4 Standard configuration default Baud rate 19200 Baud...

Страница 21: ...1501 Global radiation instantaneous values High WORD temperature compensated W m 100 2 decimal The register 31501 31502 should be read in one sequence function code 0x04 LONG 31502 Global radiation instantaneous values Low WORD temperature compensated Register 31501 31502 Global radiation instantaneous values Irradiance provides the solar radiation output in 0 01 W m The value given must be divide...

Страница 22: ...for the baud rate The framing of the serial data transfer is 8 data bits even parity and 1 stop bit Default setting is 19200 baud Note The sensor needs to be restarted before changes become effective Table 5 8 2 Format of data DATA TYPE DESCRIPTION uINT Unsigned 16 bit integer INT Signed 16 bit integer uLONG Unsigned 32 bit integer LONG Signed 32 bit integer The data format includes signed and uns...

Страница 23: ...quested in just one request 16131 5 will not respond If requesting six or more registers multiple requests should be used 16131 5 will respond as expected 5 10 Adapting the Modbus address and communication settings Setting the instrument address and baud rate can be done in different ways by connecting the sensor to the PC and using a Modbus testing tool There are links to different solutions avai...

Страница 24: ...m2 on clear windless nights due to zero offset a In case of use with PV systems compare daytime measurements to PV system output Look for any patterns and events that deviate from what is normal or expected 2 2 weeks cleaning use a soft cloth to clean the dome of the instrument persistent stains can be treated with soapy water or alcohol 3 6 months inspection inspect cable quality inspect connecto...

Страница 25: ...resistance from pins to cable ends The electrical resistance should be 10 Ω In case of doubt try a new cable If all physical connections are correct and the sensor still cannot be found please contact the factory to send the sensor to the manufacturer for diagnosis and service 16131 5 does not respond to a request for 6 or more registers It is not possible to request more than five 16 bit register...

Страница 26: ...8 W m2 Check if the pyranometer has clean domes Check the location of the pyranometer are there any obstructions that could explain the measurement result Check the orientation levelling of the pyranometer Check if the right calibration factor is entered into the algorithm Please note that each sensor has its own individual calibration factor as documented in its calibration certificate Check if t...

Страница 27: ...m the range 30001 to 35000 apply to all Lambrecht sensors an address from this range is also representative of a measured value type For example register 30401 always contains the current value of the air temperature If this register address is not included in the list in register range 46001 to 49000 the connected Modbus sensor does not supply an air temperature If the auto configuration is start...

Страница 28: ...n WORD 31101 Precipitation amount total High WORD mm 1000 3 decimal places Registers 31101 31102 can only be read out together function code 0x04 LONG 0x04 Big Endian LONG 31102 Precipitation amount total Low WORD 0x04 31201 Precipitation intensity 1 minute sliding mm min 1000 average 1 min 3 decimal places Time base 1 min Meas rate 6x per min INT 0x04 Big Endian WORD 31401 Global radiation instan...

Страница 29: ...tion instantaneous values INT 46002 31402 Register address 1 Global radiation average value since last retrieval INT 46003 31403 Register address 1 Global radiation maximum value since last retrieval INT 46004 31404 Register address 1 Global radiation minimum value since last retrieval INT 46005 31501 Register address 1 Global radiation instantaneous values High WORD temperature compensated INT 46...

Страница 30: ...igned to comply and is in conformity with the relevant sections and applicable requirements of the following standards Emission IEC EN 61000 6 1 Class B RF emission requirements IEC CISPR11 and EN 55011 Class B requirements Immunity IEC EN 61000 6 2 and IEC 61326 requirements Subject to change without notice Manual_16131 5 12 19 _____________________________________________________________________...

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