Campbell MS-80M User manual

Revision: 05/2020
Copyright © 2018 – 2020
Campbell Scientific, Inc.

Table of contents
1. MS-80M introduction 1
2. QuickStart 1
3. MS-80M specifications 4
4. Siting 4
5. Mounting procedure 5
6. MS-80M wiring 7
7. RS-485 default configuration 7
8. MS-80M register map 7
9. RS-485 programming 8
10. Maintenance and troubleshooting 9
Appendix A. Importing Short Cut code into CRBasic Editor 11
Appendix B. MS-80M example program 12
Table of Contents - i

1. MS-80M introduction
The MS-80M, manufactured by EKO Instruments, is an innovative, next-generation secondary
standard pyranometer inspired by the combination of latest technologies and state-of-the-art
thermopile sensor with an unprecedented, low zero-offset behavior; fast sensor response;
Modbus RTU 485 output; and a five-year warranty and recalibration interval.
The MS-80M features a compact design with internal desiccation, single dome, isolated
thermopile detector, quartz diffusor, immunity to offsets, ultra-low temperature dependency, and
exceptional non-linearity characteristics. EKO instruments is the only ISO 17025 accredited
pyranometer manufacturer in the world, enabling highest-quality calibration, compliant to
international standards (ISO/IEC 17025/9847).
2. QuickStart
A video that describes data logger programming using Short Cut is available at:
www.campbellsci.com/videos/cr1000x-datalogger-getting-started-program-part-3. Short Cut is
an easy way to program your data logger to measure the sensor and assign data logger wiring
terminals. Short Cut is available as a download on www.campbellsci.com. It is included in
installations of LoggerNet, RTDAQ, PC400, or PC200W.
The following procedure also shows using Short Cut to program the sensor.
1. Open Short Cut and click Create New Program.
2. Double-click the data logger model.
MS-80M Secondary Standard Pyranometer with RS-485 Modbus Communication 1

3. In the Available Sensors and Devices box, type MS-80M or locate the sensor in the Sensors
> Meteorological > Solar Radiation folder. Double-click the MS-80M. Type the RS-485
address. Default value is 53.
4. Click the Wiring tab to see how the sensor is to be wired to the data logger. Click OK after
wiring the sensor.
5. Repeat steps three and four for other sensors.
MS-80M Secondary Standard Pyranometer with RS-485 Modbus Communication 2

6. In Output Setup, type the scan rate, meaningful table names, and Data Output Storage
Interval.
7. Select the measurement and its associated output option.
8. Click Finish and save the program. Send the program to the data logger if the data logger
is connected to the computer.
9. If the sensor is connected to the data logger, check the output of the sensor in the data
logger support software data display in LoggerNet, PC400, RTDAQ, or PC200W to make
sure it is making reasonable measurements.
MS-80M Secondary Standard Pyranometer with RS-485 Modbus Communication 3

3. MS-80M specifications
ISO 9060:classification: Secondary standard
Output: Modbus RS-485
Default Modbus address: 53
Response time 95%: 1 s
Zero offset A: < 1 W/m2(response to 200 W/m2net thermal radiation)
Zero offset B: ±1 W/m2(5 K/hr)
Non-stability: ±0.5% change in 5 years
Non-linearity: ±0.2% (1000 W/m2)
Directional response: ±10 W/m2(1000 W/m2)
Spectral selectivity: ±3% (0.35 to 1.5 µm )
Spectral range: 285 to 3000 nm
Operating temperature range: –40 to 80 °C
Temperature response: < 0.4% (–10 to 40 °C), < 0.5% (–20 to 50 °C)
Tilt response: ±0.2% (1000 W/m² )
Irradiance range: 0 to 4000 W/m²
Operating voltage range: 12 to 24 VDC
Power consumption: 0.2 to 0.3 W
Compliance documents: View at: www.campbellsci.com/ms-80m-l
4. 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
MS-80M Secondary Standard Pyranometer with RS-485 Modbus Communication 4

pointing towards the nearest magnetic pole. For example, in the northern hemisphere, point the
cable toward the North Pole.
5. 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.
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.
MS-80M Secondary Standard Pyranometer with RS-485 Modbus Communication 5

5. For the CM256 bracket, use the two set screws to secure the bracket to the crossarm or pole
as shown in the following figure. 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.
MS-80M Secondary Standard Pyranometer with RS-485 Modbus Communication 6

6. Verify mounting hardware is firmly tightened, and that the mounting bracket is at the
desired angle.
6. MS-80M wiring
Table 6-1: Pin-out, wire color, function, and data logger connection
Wire color Pin-out Function Data logger
connection1
Green 4 RS-485A A–, C (odd)
White 3 RS-485B B+, C (even)
Red 1 Power in (12 V) 12V
Black 2 Power ground G
Yellow 5 RS-485 ground G
Clear N/C Shield ⏚(analog ground)
1Assumes the sensor directly connects to the data logger.
7. 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.
8. MS-80M register map
Table 8-1 (p. 8) provides the register map for the most commonly used values. A comprehensive
register map is available in the EKO manual.
MS-80M Secondary Standard Pyranometer with RS-485 Modbus Communication 7

Table 8-1: RS-485 register map
Starting
registernumber
Register
count
Data
format Units Description
14 1 16 bit
integer W/m² Irradiance minimum output
15 1 16 bit
integer W/m² Irradiance maximum output
17 2 Float µV/W/m² Pyranometer sensitivity
19 1 16 bit
integer Temperature units 1 = °C, 2 = K, 3 = °F
20 2 Float mV Sensor voltage output with three decimals
22 2 Float W/m² Irradiance
24 2 Float °C Internal temperature
26 1 16 bit
integer
Password (required for setting the temperature
and linearity corrections)
27 2 Float Temperature response correction factor1a
29 2 Float Temperature response correction factor1b
31 2 Float Temperature response correction factor1c
33 2 Float Temperature response correction factor1d
1If temperature correction is required, the following formula is used:
ETC(E,T) = E/TC1(T); TC1(T)=a + b + T + cT2+ dT3
Where,
ETC(E,T): Measurement voltage with temperature correction (mV)
E: Measurement voltage (mV)
TC1(T): Correction coefficient
T: Internal temperature (°C)
a, b, c, d: Correction coefficients
9. 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).
MS-80M Secondary Standard Pyranometer with RS-485 Modbus Communication 8