Campbell MS-80 User manual

Revision: 11/2020

Campbell Scientific, Inc.

Table of contents

1. MS-80 introduction 1

2. QuickStart 1

3. MS-80 specifications 5

4. Siting 5

5. Mounting procedure 6

6. MS-80 wiring 8

7. Solar radiation programming 9

8. Internal PT100 programming 10

9. Maintenance and troubleshooting 10

Appendix A. Importing Short Cut code into CRBasic Editor 12

Appendix B. MS-80 example program 13

Table of Contents - i

1. MS-80 introduction

The MS-80, 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; and a

five-year warranty and recalibration interval.

The MS-80 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).

For a similar pyranometer with RS-485 Modbus communications, refer to the MS-80M:

www.campbellsci.com/ms-80m-l.

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-80 Secondary Standard Pyranometer 1

3. In the Available Sensors and Devices box, type MS-80 or locate the sensor in the Sensors >

Meteorological >Solar Radiation folder. Double-click the MS-80 (Pt100 temp) Secondary

Standard Pyranometer. Type the Sensitivity (uV/W/m^2) from calibration sheet. This value

is unique for each MS-80.

MS-80 Secondary Standard Pyranometer 2

4. Click the Wiring tab to see how the sensor is to be wired to the data logger and 3WHB10K;

a completion resistor such as the 3WHB10K is required to connect the MS-80 to a data

logger. Click OK after wiring the sensor.

5. Repeat steps three and four for other sensors.

MS-80 Secondary Standard Pyranometer 3

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-80 Secondary Standard Pyranometer 4

3. MS-80 specifications

ISO 9060 classification: Secondary standard

Output: Analog (mV)

Response time 95%: < 0.5 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: < 0.8% (–10 to 40 °C), < 1% (–20 to 50 °C)

Tilt response: ±0.2% (1000 W/m2)

Sensitivity: ~10 µV/W/m2

Impedance: < 45000 Ω

Irradiance range: 0 to 4000 W/m2

Compliance documents: View at: www.campbellsci.com/ms-80-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-80 Secondary Standard Pyranometer 5

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-80 Secondary Standard Pyranometer 6

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-80 Secondary Standard Pyranometer 7

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

desired angle.

6. MS-80 wiring

The MS-80 requires a completion resistor such as the 3WHB10K to measure the internal PT100

sensor. Table 6-1 (p. 8) shows the wiring to the data logger and 3WHB10K.

Table 6-1: Pin-out, wire color, function, and connections of data logger and 3WHB10K

Wire

color Pin-out Function Data logger connection 3WHB10K

connection

Red 1 Pyranometer

signal high

Uconfigured for differential input1,

DIFF H (differential high, analog-

voltage input)

Black 2

Pyranometer

signal

reference

Uconfigured for differential input1,

DIFF L (differential low, analog-

voltage input)

Clear N/C

Shield

(tied to

connector,

body of

sensor)

⏚(analog ground)

White 3

PT100

voltage

excitation

Green 4 PT100 signal L

Yellow 5 PT100 ground ⏚

Uconfigured for differential input1,

DIFF H (differential high, analog-

voltage input)

HI pin

Uconfigured for differential input1,

DIFF L (differential low, analog-

voltage input)

LO pin

MS-80 Secondary Standard Pyranometer 8

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