Lambrecht 16131.5 Series Manual Download Page 9

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16131.5 ADDITIONAL SPECIFICATIONS

Measurand

Sensor body temperature

Measurand in SI radiometry units

temperature in °C

Temperature sensor

solid state System on Chip (SoC) silicon bandgap temperature

sensor

Instrument body temperature accuracy

0.5 °C

Instrument body temperature resolution

3.9 x 10

-3

°C

Levelling (see options)

bubble level and adjustable levelling feet are included

Levelling accuracy

< 0.1 ° bubble entirely in ring

Connector type

M12-A, 5-pole, IP67

Mounting

2 x M5 bolt at 46 mm distance on north-south axis

IP protection class

IP67

Net weight including 5m cable

0.65 kg

HEATING (00.16131.501030 and 00.16131.501000 only)

Heater operation

the heater is not necessarily switched on; recommended

operation is to activate the heater when the sun is below the

horizon

Heater voltage

12 VDC

Required heater power

1.5 W at 12 VDC (the heater is not necessarily active)

Heater resistance

95 Ω

Steady state zero offset caused by heating

0 to -8 W/m2

CALIBRATION

Calibration traceability

to WRR

Calibration hierarchy

from WRR through ISO 9846 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/m

Validity of calibration

based on experience the instrument sensitivity will not change

during storage. During use under exposure to solar radiation

the instrument “non-stability” specification is applicable.

MEASUREMENT ACCURACY AND RESOLUTION

Uncertainty of the measurement

statements about the overall measurement uncertainty can

only be made on an individual basis.

WMO estimate on achievable accuracy for

daily sums

5 % (WMO-No. 8, seventh edition 2008)

WMO estimate on achievable accuracy for

hourly sums

8 % (WMO-No. 8, seventh edition 2008)

Irradiance resolution

0.01 W/m

00.16131.501030 –

DIGITAL MODBUS RTU (RS-485)

Digital output

irradiance in W/m2

instrument body temperature in °C

Rated operating voltage range

5 to 30 VDC (recommended 12 VDC)

Power consumption

< 48 x 10

-3

W at 12 VDC (unheated)

Heater

included

Communication protocol

Modbus over 2-wire RS-485

half duplex

RS-485 transceiver type

2-wire, non-isolated

Transmission mode

RTU

Summary of Contents for 16131.5 Series

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

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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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