Campbell SR20-D2 Manuel utilisateur

Revision: 04/2020

Campbell Scientific, Inc.

Table of contents

1. SR20-D2 introduction 1

2. Siting 1

3. Mounting procedure 1

4. SR20-D2 wiring 3

4. RS-485 default configuration 4

5. SR20-D2 register map 4

6. RS-485 programming 5

7. SR20-D2 example program 5

8. Maintenance and troubleshooting 9

Table of Contents - i

1. SR20-D2 introduction

The SR20-D2, manufactured by Hukseflux Thermal Sensors, is an ISO 9060 digital spectrally flat

Class A (secondary standard) pyranometer that measures solar short-wave radiation in a full

hemisphere of the sky. It has a built-in case-temperature sensor and embedded heater for

removing dew and light rain. It connects directly to Campbell Scientific data loggers and is

designed for applications that require high measurement accuracy in demanding applications

such as scientific meteorological observation networks and utility scale solar-energy-power

production sites.

2. Siting

The solar radiation sensor is usually installed horizontally, but can also be installed at any angle

including an inverted position. Site the sensor to allow easy access for maintenance while ideally

avoiding any obstructions or reflections above the plane of the sensing element. It is important

to mount the sensor such that a shadow or a reflection will not be cast on it at any time. If this is

not possible, try to choose a site where any obstruction over the azimuth range between earliest

sunrise and latest sunset has an elevation not exceeding 5°. Diffuse solar radiation is less

influenced by obstructions near the horizon. The sensor should be mounted with the cable

pointing towards the nearest magnetic pole. For example, in the northern hemisphere, point the

cable toward the North Pole.

3. Mounting procedure

Required tools:

lDiopter

lSolar compass

l8 mm (5/16-inch) open-end wrench for U-bolt nuts

1. On a level surface, level the solar radiation sensor using the leveling feet on the sensor.

Alternatively, remove the sensor leveling feet to allow it to be mounted directly to the

mounting bracket.

SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer 1

2. Secure the solar radiation sensor to the mounting bracket. The blue dots in the following

figure indicate the mounting holes used for this pyranometer.

3. Using a diopter in combination with a solar compass, install and orient the crossarm on the

tripod or the mast. If installing the mounting bracket on a vertical pole, ensure the pole is

truly vertical.

4. Secure the mounting bracket to the crossarm or vertical pole using the hardware included

with the mounting bracket. The CM255 uses one U-bolt, nuts, flat washers, and lock

washers to mount the bracket, as shown in the following figure.

SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer 2

5. For pyranometers mounted horizontally, ensure the mounting bracket is horizontal in two

dimensions. For pyranometers mounted at an angle, set the mounting bracket angle to the

desired angle prior to tightening the mounting hardware.

6. Verify mounting hardware is firmly tightened, and that the mounting bracket is at the

desired angle.

4. SR20-D2 wiring

Table 4-1: Pin-out, wire color, function, and data logger connection

Wire color Pin out Function Data logger connection

-PT -PW

Green 5 2 RS-485A A-, C (odd)

White 7 4 RS-485B B+, C (even)

Red 2 1 Power in (12 V) 12V

Black 6 3 Power ground G

Clear 9 5 Shield ⏚(analog ground)

1Assumes the sensor directly connects to the data logger.

SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer 3

4. RS-485 default configuration

The default RS-485 settings are: 19200 baud rate, 8 data bits, even parity, one stop bit. This

configuration is used for most Modbus networks.

5. SR20-D2 register map

Table 5-1 (p. 4) provides the register map for the most commonly used values. A comprehensive

Table 5-1: RS-485 register map

Starting

Number

Count Data Format Units Description

1 1 Signed 16 bit integer Modbus address

3 2 Signed32bitinteger mW/m2Irradiance (temperature

compensated signal)

5 2 Signed32bitinteger mW/m2Irradiance (temperature

uncompensated signal)

7 1 Signed 16 bit integer 0.01 °C Sensor body temperature

8 1 Signed 16 bit integer x 0.1 Ω Sensor electrical resistance

9 1 Signed 16 bit integer Scaling factor irradiance

10 1 Signed 16 bit integer Scaling factor temperature

11 2 Signed 32 bit integer nV Sensor voltage output

41 1 Signed 16 bit integer Serial number

42 2 Float µV/W/m2Sensor sensitivity

47 2 Signed 32 bit integer Calibration date

99 1 Signed 16 bit integer x 0.01 % Humidity

SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer 4

6. RS-485 programming

The RS-485 output can be directly read by a MeteoPV, CR6-series, CR1000X-series, or Modbus

RTU RS-485 network. Other Campbell Scientific data loggers can use an MD485 multidrop

interface to read the RS-485 output (refer to the MD485 manual).

A CR6 or CR1000X data logger programmed as a Modbus Master can retrieve the values stored in

the Input Registers. To do this, the CRBasic program requires a SerialOpen() instruction

followed by the ModbusMaster() instruction.

The SerialOpen instruction has the following syntax:

SerialOpen (ComPort, Baud, Format, TXDelay, BufferSize, Mode)

The Format is typically set to logic 1 low; even parity, one stop bit, 8 data bits. The Mode

parameter should configure the ComPort as RS-485 half-duplex, transparent. The

ModbusMaster() instruction has the following syntax:

ModbusMaster (Result, ComPort, Baud, Addr, Function, Variable, Start, Length,

Tries, TimeOut, [ModbusOption])

The Addr parameter must match the sensor Modbus address. To collect all of the values, the

Start parameter needs to be 1 and the Length parameter needs to correspond with the

described in the CRBasic Editor Help. Refer to SR20-D2 example program (p. 5) for more

information.

7. SR20-D2 example program

Table 7-1: Wiring for example program

Wire color Function Data logger connection

Green RS-485A C5

White RS-485B C6

Red Power in (12 V) 12V

Black Power ground G

Clear Shield ⏚(analog ground)

SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer 5

CRBasic Example 1: CR1000X program for measuring the SR20-D2

'CR1000X Series Datalogger

'Hukseflux SR20-D2 Pyranometer

'SR20 is a ISO 9060 Secondary Standard digital pyranometer

'D2 uses Modbus RS-485 protocol

'PN 34088 SR20-D2CBL-L (CSI's SR20D2 Cable)

Dim SR20D2(15) As Long

Public SR20D2_IRR_TC 'Temperature compensated x 0.01 W/M^2

Public SR20D2_IRR 'Uncompensated x 0.01 W/M^2

Public SR20D2_BodyTemp As Float

Public SR20D2_SerialNumber As Float

Public SR20D2_CalDate As Long

Public SR20D2_Humidity As Float

Public SR20D2_ScaleFactor_IRR As Long

Public SR20D2_ScaleFactor_BodyTemp As Long

Public SR20D2_ElecResistance As Long

Public SR20D2_VoltageOut As Float

Public ModbusResult_IRR_TC

Public ModbusResult_IRR

Public ModbusResult_BodyTemp

Public ModbusResult_SN

Public ModbusResult_CalDate

Public ModbusResult_Humidity

Public ModbusResult_SFIRR

Public ModbusResult_SRTemp

Public ModbusResult_ElecRes

Public ModbusResult_VoltOut

Units SR20D2_IRR = W/m^2

Units SR20D2_IRR_TC = W/m^2

Units SR20D2_BodyTemp = DegC

Units SR20D2_Humidity = %

Units SR20D2_ElecResistance = Ohm

Units SR20D2_VoltageOut = uV

DataTable (OneMin,1,-1)

DataInterval (0,1,Min,10)

Average (1,SR20D2_IRR,IEEE4,False)

Average (1,SR20D2_IRR_TC,IEEE4,False)

Maximum (1,SR20D2_IRR_TC,IEEE4,False,False)

Minimum (1,SR20D2_IRR_TC,IEEE4,False,False)

StdDev (1,SR20D2_IRR_TC,IEEE4,False)

Average (1,SR20D2_BodyTemp,IEEE4,False)

EndTable

DataTable (SR20D2_MetaData,1,-1)

Sample (1,SR20D2_ElecResistance,IEEE4)

Sample (1,SR20D2_VoltageOut,IEEE4)

Sample (1,SR20D2_Humidity,IEEE4)

SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer 6

CRBasic Example 1: CR1000X program for measuring the SR20-D2

EndTable

DataTable (SR20D2_SensorID,1,100)

Sample (1,SR20D2_SerialNumber,FP2)

Sample (1,SR20D2_CalDate,Long)

Sample (1,SR20D2_ScaleFactor_IRR,FP2)

Sample (1,SR20D2_ScaleFactor_BodyTemp,FP2)

EndTable

BeginProg

SerialOpen (ComC5,19200,2,0,50,4)

ModbusMaster (ModbusResult_SN,ComC5,19200,53,4,SR20D2(1),41,1,1,100,3)

'Serial Number

SR20D2_SerialNumber = SR20D2(1)

ModbusMaster (ModbusResult_CalDate,ComC5,19200,53,4,SR20D2(2),47,1,1,100,2)

'Cal Date

SR20D2_CalDate = SR20D2(2)

ModbusMaster (ModbusResult_SFIRR,ComC5,19200,53,4,SR20D2(3),9,1,1,100,3)

'Scaling Factor IRR

SR20D2_ScaleFactor_IRR = SR20D2(3)

ModbusMaster (ModbusResult_SRTemp,ComC5,19200,53,4,SR20D2(4),10,1,1,100,3)

'Scaling Factor Temp

SR20D2_ScaleFactor_BodyTemp = SR20D2(4)

ModbusMaster (ModbusResult_ElecRes,ComC5,19200,53,4,SR20D2(10), _

8,1,1,100,1)

'Electrical Resistance

SR20D2_ElecResistance = SR20D2(10)/10

ModbusMaster (ModbusResult_VoltOut,ComC5,19200,53,4,SR20D2(11), _

11,2,1,100,2)

'Voltage output

SR20D2_VoltageOut = SR20D2(11)

ModbusMaster (ModbusResult_Humidity,ComC5,19200,53,4,SR20D2(13),99,1,1,100,3)

'Humidity

SR20D2_Humidity = SR20D2(13)/100

Scan (1,Sec,0,0)

ModbusMaster (ModbusResult_IRR_TC,ComC5,19200,53,4,SR20D2(5),3,2,1,100,2)

'Irradiance temperature compensated

SR20D2_IRR_TC = SR20D2(5)/SR20D2_ScaleFactor_IRR

ModbusMaster (ModbusResult_IRR,ComC5,19200,53,4,SR20D2(7),5,2,1,100,2)

'Irradiance uncompensated

SR20D2_IRR = SR20D2(7)/SR20D2_ScaleFactor_IRR

ModbusMaster (ModbusResult_BodyTemp,ComC5,19200,53,4,SR20D2(9),7,1,1,100,1)

'Body Temp

SR20D2_BodyTemp = SR20D2(9)/SR20D2_ScaleFactor_BodyTemp

CallTable OneMin

NextScan

SlowSequence

Scan (6,Hr,0,0)

ModbusMaster (ModbusResult_ElecRes,ComC5,19200,53,4,SR20D2(10),8,1,1,100,1)

SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer 7

CRBasic Example 1: CR1000X program for measuring the SR20-D2

'Electrical Resistance

SR20D2_ElecResistance = SR20D2(10)/10

ModbusMaster (ModbusResult_VoltOut,ComC5,19200,53,4,SR20D2(11), _

11,2,1,100,2)

'Voltage output

SR20D2_VoltageOut = SR20D2(11)

ModbusMaster (ModbusResult_Humidity,ComC5,19200,53,4,SR20D2(13), _

99,1,1,100,3)

'Humidity

SR20D2_Humidity = SR20D2(13)/100

CallTable SR20D2_MetaData

NextScan

SlowSequence

Scan (1,Sec,0,1)

If SR20D2_SerialNumber = 0 Then

ModbusMaster (ModbusResult_SN,ComC5,19200,53,4,SR20D2(1),41,1,1,100,3)

'Serial Number

SR20D2_SerialNumber = SR20D2(1)

ModbusMaster (ModbusResult_CalDate,ComC5,19200,53,4,SR20D2(2), _

47,1,1,100,2)

'Cal Date

SR20D2_CalDate = SR20D2(2)

ModbusMaster (ModbusResult_SFIRR,ComC5,19200,53,4,SR20D2(3),9,1,1,100,3)

'Scaling Factor IRR

SR20D2_ScaleFactor_IRR = SR20D2(3)

ModbusMaster (ModbusResult_SRTemp,ComC5,19200,53,4,SR20D2(4),10,1,1,100,3)

'Scaling Factor Temp

SR20D2_ScaleFactor_BodyTemp = SR20D2(4)

ModbusMaster (ModbusResult_ElecRes,ComC5,19200,53,4,SR20D2(10), _

8,1,1,100,1)

'Electrical Resistance

SR20D2_ElecResistance = SR20D2(10)/10

ModbusMaster (ModbusResult_VoltOut,ComC5,19200,53,4,SR20D2(11), _

11,2,1,100,2)

'Voltage output

SR20D2_VoltageOut = SR20D2(11)

ModbusMaster (ModbusResult_Humidity,ComC5,19200,53,4,SR20D2(13), _

99,1,1,100,3)

'Humidity

SR20D2_Humidity = SR20D2(13)/100

EndIf

CallTable SR20D2_SensorID

NextScan

EndProg

SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer 8

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