Campbell MS-80 User manual

Revision: 11/2020
Copyright © 2018 – 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
H
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