Campbell MS-80M User manual

Revision: 05/2020

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

MS-80M Secondary Standard Pyranometer with RS-485 Modbus Communication 7

Table 8-1: RS-485 register map

Starting

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

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