EKO MS-80 User manual

INSTRUCTION MANUAL
MS-80
MS-80S
MS-80U
Pyranometer
ISO9060: 2018 Class A
ISO9060: 1990 Secondary Standard

EKO INSTRUMENTS CO., LTD. - Pyranometer MS-80/80S/80U - Instruction Manual Ver. 4
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1. Index
1. Index 1
2. Important User Information 2
2-1. Contact Information 2
2-2. Warranty and Liability 2
2-3. About Instruction Manual 3
2-4. Environment 3
2-5. ISO/IEC 17025 4
2-6. CE Declaration 5
3. Safety Information 6
3-1. General Warnings 6
4. Introduction 8
4-1. About the Pyranometer Series 9
4-2. Package Contents 11
5. Getting Started 12
5-1. Parts Name and Descriptions 12
5-2. Setup 14
5-3. Measuring Solar Irradiance 20
6. Maintenance & Troubleshooting 22
6-1. Maintenance 22
6-2. Calibration and Measurement Uncertainty 24
6-3. Troubleshooting 25
7. Specifications 26
7-1. Specifications 26
7-2. Dimensions 28
7-3. Output Cables 30
7-4. Accessories List 30
APPENDIX 31
A-1. Radiometric Terms 31
A-2. Pyranometer Characteristics 32
A-3. Configurator Software [MS-80S] 33
A-4. Communication Specifications [MS-80S Modbus RTU] 37
A-5. Communication Specifications [MS-80S SDI-12] 45
A-6. Recalibration 46
A-7. MS-80U Tem pera ture Sens or [ 10k Ω NT C ] 47
A-8. MS-80 RTD temperature conversion table[Pt100 Class A] 48

EKO INSTRUMENTS CO., LTD. - Pyranometer MS-80/80S/80U - Instruction Manual Ver. 4
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2. Important User Information
Thank you for using EKO Products
Reading this manual is recommended prior to installation and operation of the product. Keep this
manual in safe and handy place for whenever it is needed.
For any questions, please contact us at below:
2-1. Contact Information
EKO INSTRUMENTS CO., LTD.
Asia, Oceania Region
https://eko-asia.com/
[email protected]
EKO INSTRUMENTS Co., Ltd.
1-21-8, Hatagaya, Shibuya-ku
Tokyo, 151-0072 Japan
Tel: +81 [3] 3469-6713
Fax: +81 [3] 3469-6719
Europe, Middle East, Africa, South America Region
https://eko-eu.com/
[email protected]
EKO INSTRUMENTS Europe B.V.
Lulofsstraat 55, Unit 28,
2521 AL, Den Haag, The Netherlands
Tel: +31 [0]70 3050117
Fax: +31 [0]70 3840607
North America Region
https://eko-usa.com/
[email protected]
EKO INSTRUMENTS USA Inc.
111 North Market Street, Suite 300
San Jose, CA 95113 USA
Tel: [phone]
Fax: [phone]
2-2. Warranty and Liability
For warranty terms and conditions, please contact EKO Instruments or your distributer for further details.
EKO guarantees that the product delivered to customer has been tested to ensure the instrument meets its
published specifications. The warranty included in the conditions of delivery is valid only if the product has
been installed and used according to the instructions provided in this operating manual.
In case any manufacturing defect[s] will occur, the defected part[s] will be repaired or replaced under
warranty; however the warranty will not be applicable if:
➢Any modification or repair has been done by other than EKO service personnel.
➢The damage or defect is caused by disrespecting the specifications mentioned on the product
brochure or instruction manual.

EKO INSTRUMENTS CO., LTD. - Pyranometer MS-80/80S/80U - Instruction Manual Ver. 4
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2-3. About Instruction Manual
Copy Rights Reserved by EKO INSTRUMENTS CO., LTD. Making copies of whole or parts of this
document without permission from EKO is prohibited.
This manual was issued: 2019/07/30
Version Number: 4
2-4. Environment
1. WEEE Directive 2002/96/EC
[Waste Electrical and Electronic Equipment]
In August of 2005, the European Union [EU] implemented the EU WEEE Directive 2002/96/EC and later the
WEEE Recast Directive 2012/19/EU requiring Producers of electronic and electrical equipment [EEE] to
manage and finance the collection, reuse, recycling and to appropriately treat WEEE that the Producer
places on the EU market after August 13, 2005. The goal of this directive is to minimize the volume of
electrical and electronic waste disposal and to encourage re-use and recycling at the end of life.
EKO products are subject to the WEEE Directive 2002/96/EC. EKO Instruments has labeled its branded
electronic products with the WEEE Symbol [figure Trash bin] to alert our customers that products bearing this
label should not be disposed of in a landfill or with municipal or household waste in the EU.
If you have purchased EKO Instruments branded electrical or electronic products in the EU and are intending
to discard these products at the end of their useful life, please do not dispose of them with your other
household or municipal waste. Disposing of this product correctly will help save valuable resources and
prevent any potential negative effects on human health and the environment, which could otherwise arise
from inappropriate waste handling.
2. RoHS Directive 2002/95/EC
EKO Instruments has completed a comprehensive evaluation of its product range to ensure compliance with
RoHS Directive 2002/95/EC regarding maximum concentration values for substances. As a result all products
are manufactured using raw materials that do not contain any of the restricted substances referred to in the
RoHS Directive 2002/95/EC at concentration levels in excess of those permitted under the RoHS Directive
2002/95/EC, or up to levels allowed in excess of these concentrations by the Annex to the RoHS Directive
2002/95/EC.

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2-5. ISO/IEC 17025
EKO Instruments Co. Ltd. calibration laboratory is accredited by Perry Johnson Laboratory Accreditation, Inc.
[PJLA] to perform pyranometer and pyrheliometer calibrations in accordance with the requirements of
ISO/IEC17025, which are relevant to calibration and testing.
EKO is a unique manufacturer who can offer calibration service for pyranometers and pyrheliometers in-house.
Based on the applied calibration methods EKO provides the best quality solar sensor calibrations compliant to the
international standards defined by ISO/IEC17025 / 9847 [Indoor method] and ISO9059 [Outdoor method]
[Certification: L13-94-R2 / www.pjlabs.com]
ISO/IEC17025 provides a globally accepted basis for laboratory accreditation that specifies the management and
technical requirements. With calibrations performed at the EKO Instruments laboratory we enable our customers
to:
・Clearly identify the applied calibration methods and precision
・Be traceable to the World Radiation Reference [WRR] through defined industrial standards:
ISO9846 Calibration of a pyranometer using a pyrheliometer
ISO9847 Calibration of field pyranometer by comparison to a reference pyranometer
ISO9059 Calibration of field pyrheliometers by comparison to a reference pyrheliometer
・Obtain repeatable and reliable calibration test results through consistent operations
Our clients will obtain a highly reliable data by using an ISO/IEC17025 calibrated sensor. Our Accredited lab is
regularly re-examined to ensure that they maintain their standards of technical expertise.

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2-6. CE Declaration
DECLARATION OF CONFORMITY
We: EKO INSTRUMENTS CO., LTD
1-21-8 Hatagaya Shibuya-ku,
Tokyo 151-0072 JAPAN
Declare under our sole responsibility that the product:
Product Name : Pyranometer
Model No. : MS-80, MS-80U, MS-80S
To which this declaration relates is in conformity with the following
harmonized standards of other normative documents:
Harmonized standards:
EN 61326-1:2006 Class A [Emission]
EN 61326-1:2006 Class A [Immunity]
Following the provisions of the directive:
EMC-directive: 89/336/EEC
Amendment to the above directive: 93/68/EEC
Date: April 4 , 2019
Position of Authorized Signatory: General Manager of R & D Department
Name of Authorized Signatory: Shuji Yoshida
Signature of Authorized Signatory:

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3. Safety Information
EKO Products are designed and manufactured with consideration for safety; however, please make
sure to read and understand this instruction manual thoroughly to be able to operate the instrument
safely in the correct manner.
WARNING
CAUTION
Attention to user; pay attention to the instructions given on the
instruction manual with this sign.
HIGH
VOLTAGE
WARNING
High voltage is used; pay special attention to instructions given on
this instruction manual with this sign to prevent electric leakage
and/or electric shocks.
3-1. General Warnings
1. Setup
➢The installation base or mast should have enough load capacity for the instrument to be mounted.
Fix the pyranometer securely to the base or mast with bolts and nuts; otherwise, the instrument
may drop due to gale or earthquake, which may lead to unexpected accidents.
➢Make sure the instrument and the cables are installed in a location where they will not get soaked.
➢When using this instrument by connecting to a measuring instrument, make sure to connect the
shield cable to either the signal ground terminal on the measuring instrument side or GND [the
reference potential on the single end input side]. Noise may be included in the measurement
data.
➢Although this product is tested to meet EMC Directive compliance requirements, it may not fully
satisfy its primary specification/performance when using this product near following locations
where strong electromagnetic wave is generated. Please pay attention to the installation
environment.
Outdoor: High voltage power line, power receiver/distribution facility, etc.
Indoor: Large-size chiller, large rotation device, microwave, etc.
➢Do not use this product in environment where corrosive gas, such as ammonia and sulfurous acid
gas, are generated. It may cause malfunction.
➢Do not install in area that cause salt damages. It may cause malfunction by paint peeling off or
corrosion. When installing in area with risk of salt damages, make sure to take following measures:
1. Wrap the connector with self-fusing tape
2. Change the fixing screw to bolt screw made of aluminum
3. Run the cables in resin pipe or metal pipe treated with salt-resistant paint such as molten zinc
plating
4. Periodically clean.

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➢Do not use this instrument in vacuum environment.
➢If the cable and main unit are in risk for getting damaged by birds and small animals, protect the
cable and the main unit by using:
1. Reflective tape
2. Repellent
3. Cable duct
4. Installing bird-spike
➢When using the 0 to1V, please prepare the precision resister 100Ω. If 0-1V output is not selected
as a purchase option, 0-1V output is off. Or the setting can be changed with the 485 / USB
conversion cable and dedicated software.
2. Handling
➢Be careful with glass dome when handling instruments. Strong impact to this part may damage the
glass and may cause injuries by broken glass parts.
➢When carrying any MS-80 model with the sunscreen attached, always hold the instrument from the
bottom. Holding only the sunscreen part may lead to dropping the sensor as it comes off from the
sunscreen.
3. Power Supply [MS-80S]
➢Make sure to ground the power supply. When grounding is insufficient, it may cause not only
measurement error due to noise, but also cause electric shock and leakage accidents.
➢Check the voltage and types of specified power supply before connecting this instrument. When
improper power supply is connected, it may cause malfunction and/or accident.
➢Use this instrument with 0.5A fuse connected to the power supply line in series. Without
connecting the fuse, it has risks of generating heat and fire due to large-current flowing by the
power supply when internal damage on the electronics will occurs.

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4. Introduction
EKO’s new generation sensor, the MS-80 broke with the rules of traditional pyranometer architecture. The
innovative design was inspired by the combination of latest technologies and state-of-the-art thermopile sensor,
enabling a breakthrough in unprecedented low zero-offset behaviour, fast sensor response, high accuracy and
over time measurement stability.
The compact sensor with single dome is immune to offsets and integrates all value added functions to reduce
maintenance. MS-80 pyranometer no longer have a drying cartridge, silica gel inside will keep the sensor dry
during the entire life-cycle.
The S-model has smart electronics, which provided advanced measurement functions with different industrial
signal outputs (MODBUS 485 RTU, SDI-12, 4-20mA, configurable 0-10mA / 0-1V with optional precision shunt
resistor 100Ω) and on-board sensors for remote diagnostics of the sensor temperature, relative humidity and tilt
position.
For the MS-80 series a range of accessories is available (MV-01 ventilator and heater, cable extensions).
MS-80 unique properties:
Long term stability Compared to our conventional pyranometer, the long-term stability is further enhanced with
improved airtightness and the sensor architecture with low sensitivity degradation properties.
Fast detector response The MS-80 is based on the latest thermopile technology, and realized with a response time
of <0.5sec @95% or <1sec @99%. Such response time is suitable for measuring solar irradiance, which changes
momentarily.
Excellent temperature coefficient MS-80 has excellent temperature response in wide temperature range compared
to our conventional pyranometer, and it provides linear output against solar irradiance.
Lowest zero off-set Compared to the conventional pyranometers using a double-dome, MS-80 has the lowest zero
off-set effects. The combination of the isolated thermopile detector architecture and optics keep the sensor in
thermal balance within variable atmospheric conditions.
Warranty and re-calibration Unique in the market the MS-80 has 5 years warranty and 5 years recommended
re-calibration period.
ISO 9060, an international industry standard, was revised to the 2nd edition in 2018. Along with this revision, the
Pyranometers are classified in order of the highest grade "Class A", "Class B", "Class C" and for Pyranometers that
meet the response time and spectral selectivity criteria, "fast response pyranometer" and "spectrally flat
radiometer" are classified as a sub-category.

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4-1. About the Pyranometer Series
EKO offers three different MS-80 pyranometer models each with different features. With this wide range of
sensors, EKO pyranometers can meet all possible application requirements, ranging from PV module
efficiency measurements to climatology research and material durability testing.
All MS-80 sensors give excellent durability. The sensor is airtight and can be deployed with little maintenance
since the desiccant is incorporated inside. Solar sensors are applied outdoors, hence the detector black
surface, optical components and sensor mechanics are constantly exposed to solar radiation, temperature
and pressure differences. UV radiation known as harmful radiation to materials can change the chemical
properties of substances irreversibly. In case of the MS-80 the detector it is totally isolated below the sensor
optics surface, which is sealed, and can’t be affected by a high dose of UV, moisture or pressure differences.
During production and inspection, the directional response and temperature dependency are measured and
validated through a measurement report that comes with each sensor. Besides, EKO provides a unique
calibration service for pyranometers compliant to the international standards defined by ISO/IEC17025 / 9847
[indoor method]. When an ISO/ IEC17025 calibrated sensor is purchased, EKO provides a calibrated sensor
with a consitently low calibration uncertainty. The Accredited lab is regularly re-examined to ensure that they
maintain their standards of technical expertise.
In case of MS-80, MS-80S, with combination of optional MV-01 [ventilator + heater unit], reduces the dew
condensation and accumulation of dusts and snow on glass dome by continuously blowing heated air. The
ventilation unit with heater is recommended when the sensor will be deployed with a chance of occurance of
condensation, snow and ice.
In the following paragraphs, the three instrument types are described individually.
1. MS-80
The analog MS-80 pyranometer can be used as a reference sensor to measure the global broad-band solar
radiation with a high accuracy in traditional sensor networks. With excellent temperature response and
non-linearity characteristics, it provides optimal performance throughout the day.
Category of ISO9060: 2018
“Fast response and spectrally flat pyranometer of class A”
Key features:
•Fast Response time [<0.5s@95%, <1s@99%]
•Excellent temperature response over a wide temperature range [-20 to +50℃]
•Low offset characteristics

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2. MS-80S
The MS-80S with smart sensor technology and onboard diagnostic functions. 4 different output types can be
selected, which is a great benefit for system integrators who work with various industrial standards. This new
Smart transducer will also have additional features such as internal temperature and humidity sensors and a
tilt sensor for remote sensor diagnostics. These additional internal sensors will help the user to monitor the
stability of the irradiance sensors as well as to ensure its proper installation and maintenance practices.
Up to 100 smart sensors can be connected in one network. The signal converter settings can be changed
using the optional RS485 / USB converter cable and the configurator software.
Category of ISO9060: 2018
“Fast response and spectrally flat pyranometer of class A”
Key features:
•Fast Response time [<1.0s@95%]
•Outputs (MODBUS 485 RTU, SDI-12, 4-20mA, configurable 0-10mA / 0-1V with external optional 100Ω
precision shunt resistor)
•Embedded sensors for remote diagnostics (Temperature, Tilt position and relative humidity)
•Excellent temperature response over a wide temperature range [-20 to +50℃]
•Lowe power consumption
•Wide voltage-supply input range [DC 5 to 36 V]
•With built-in tilt / role sensor to check the sensor position over time.
•Humidity and temperature sensor to monitor the sensor temperature and condition of the drying agents
(silica gel) inside the sensor body.
3. MS-80U
MS-80U is the most compact and light-weight Class A pyranometer on the market. With a total weight of only
200 grams and low body height the sensor can be easily used for drone and UAV applications. The body is
hermetically sealed and can be used in environments up to 15 km above sea level. The sensor temperature
characteristics are optimized for the lower part of the temperature range.
Category of ISO9060: 2018
“Fast response and spectrally flat pyranometer of class A”
Key features:
•Compact and light weight
•Fast Response time [<0.5s@95%, <1s@99%]
•Excellent temperature response over a wide temperature range [-20 to +50℃]
•Low offset characteristics

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4-2. Package Contents
Check the package contents first; if any missing parts or any damage is noticed, please contact EKO
immediately.
Table 4-1. Package Contents
Contents
MS-80 / MS-80S
MS-80U
Pyranometer
○
○
Output Cable*
○
○
Sunscreen
○
x
Calibration Certificate
○
○
Instruction Manual
Not included in the package
[Please download from EKO Website]
Inspection Report
○
Quick Start Guide
○
-
Fixing Bolts
[ M5 ] x2
[Bolt Length: 75mm ]
Washers
[ M5 ] x4
Nuts
[ M5 ] x2
*In case of MS-80/80S, standard length is 10m for both signal/power cable. For different length of cables [e.g.
to meet your application needs] please contact EKO or your local distributor. MS-80U cable length is 3m, no
other optional lengths are available.

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5. Getting Started
5-1. Parts Name and Descriptions
Each part name and its main function is described below.
Parts Name
A. Diffuser
B. Glass Dome
C. Detector
D. Body
E. Sunscreen
F. Levelling Screw
G. Cable, Connector
H. Spirit Level
I. Knurling Screw
Parts Name
A. Diffuser
B. Glass Dome
C. Detector
D. Body
E. Levelling Screw
F. Cable
G. Spirit Level
MS-80 / 80S
*Signal converter is built-in for MS-80S.
Figure 5-1. Pyranometer Parts Name [MS-80 / 80S]
MS-80U
*The cable can’t be removed from the pyranometer
Figure 5-2. Pyranometer Parts Name [MS-80U]
Table 5-1. Parts Name
[MS-80 / 80S]
Table 5-2. Parts Name
[MS-80U]

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1. Glass Dome, Diffuser
A glass dome creates a sealed environment for the detector and protects it against dirt and rain. The dome of
the EKO pyranometers is only transparent for radiation emitted by the sun. Hence they block the undesired
infrared radiation emitted by the Earth’s atmosphere. By the combination of the glass dome and the diffuser,
it improves the cosine response generated by the incident light from the entire hemisphere.
2. Sensor
The thermopile detector, which is the heart of the pyranometer generates a voltage signal that is proportional
to the solar irradiance. The sensor determines the majority of the measurement properties [e.g. response
time, zero offset B, non-linearity, sensitivity, etc.]. MS-80 sensor varies less by aging due to special
construction.
3. Sunscreen, Body and Spirit level
MS-80, MS-80S have a sunscreen to prevent any excessive body temperature increase generated by direct
sun light. Weather resistant metal is used for the body, which has resistant against decrease of nocturnal
radiation and heat radiation, and rain and dusts. The integrated sprit level is used for setup and maintaining
the sensor in a horizontally levelled position.
4. Drying agent
Enclosed drying agents inside the sensor body keep the sensor inside dry, prevents condensation of humidity
inside of the glass dome. There is no need to replace the drying agents as they are replaced when sensor is
recalibrated at EKO.
5. Cable and Cable Connector
MS-80/ 80S are shipped with a 10 meter long output cable as standard length*.
Durable materials are used for the cable and connector, and pin terminals are attached at the end of the cable
for easy connection with data logger terminal block.
*If longer cables, round terminals or fork terminals are required, please contact EKO Instruments or your
distributor. [Also see [7. Specification, 7-4. Accessories List] for optional items.]
* If longer cables, round terminals or fork terminals are required, please contact EKO Instruments or your
distributor. [Also see [7. Specification, 7-4. Accessories List] for optional items.]
The connector should be protected by the self-fusing tape when the pyranometers are used in the areas with
the risk of the salt damage.
MS-80U has a 3 meter long output cable already attached, and the leads of the cable are soldered.

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5-2. Setup
In order to obtain high quality measurements from pyranometers, several criteria with respect to set-up and
mounting of the instruments have to be considered. Also see the Quick Start Guide for comprehensive setup
instruction details [included in the package of MS-80, MS-80S].
The ideal mounting position for pyranometers is a location which has a full hemispheric field-of-view without
any obstructions [such as buildings, trees, and mountain]; however, it might be difficult to find such locations.
Therefore in practice, it is ideal to install in a position which is free from obstructions at 5° above horizon.
The setup location should be easily accessible for periodic maintenance [glass dome cleaning, desiccant
replacement, etc.], and avoid surrounding towers, poles, walls or billboards with bright colors that can reflect
solar radiation onto the pyranometer.
A strong physical impact to the pyranometer can lead to product damage and/or may cause changes to the
sensitivity.
1. Installing at Horizontal or Tilted Positions
1) Check the installation base where the pyranometer has to be mounted and make sure it has two fixing
holes with the appropriate pitch. The pitch sizes of the fixing holes are as follows [in mm]:
Table 5-3. Fixing Hole Pitch and Bolt Size for Pyranometers
MS-80 / 80S / 80U
Fixing Hole Pitch
65 mm
Fixing Bolt Size
M5 x 75 mm
2) Setup the pyranometer with the signal cable connector facing the nearest Earth’s pole.
In the Northern hemisphere, the connector should be orientated North, in the Southern hemisphere, the
connector should be orientated South. If the signal cable connector is facing towards the sun, the
temperature of the connector increases and may cause measurement error due unwanted
thermoelectric power invited by the connector temperature increase.
3) Remove a sunscreen [except for MS-80U]
The sunscreen can be removed by loosening the knurling screw and sliding it towards the spirit level
direction.
*When carrying the MS-80 with sunscreen attached, always hold the instrument from the bottom.
Holding only the sunscreen part may lead to dropping the sensor as it comes off from the sunscreen.
4) Adjust the pyranometer in a horizontal position by using the 2 levelling screws observing the air bubble
in the spirit level while manipulating the levelling screws. The instrument is levelled horizontally if the air
bubble is in the centre ring.
If the pyranometer is not levelled properly, the pyranometer readings are affected by cosine and azimuth
errors. Periodically check the spirit level and adjust the pyranometer’s position if necessary.

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[Installing at Tilted Position]
After the MS-80 is adjusted to horizontal position in levelled surface, install it on tilted mounting position.
*When installing the instrument, do not remove the levelling feet or fixed feet; if the levelling feet are
removed, it may cause abnormal output values due to the thermal effects from the mounting part.
In the case of MS-80S, it is possible to acquire tilt information obtained from the built-in tilt sensor
through Modbus RTU.
5) Fasten the pyranometer to the base with the 2 bolts [included] and put the sunscreen back on the
pyranometer.
2. Wiring
To extend the cable lifetime, make sure that the cables are not exposed to direct sun light or rain/wind by
lining the cable through a cable conduit. Cable vibrations will potentially cause noise in the output signal.
Fasten the cable so that the cable does not swing or move by wind blowing.
Exposure of the signal cable to excessive electromagnetic emissions can cause noise in the output signal as
well. Therefore the cable should be lined at a safe distance from a potential source generating EMC noise,
such as an AC power supply, high voltage lines or telecom antenna.
◼Wiring Procedure
1) Connect the output cable to the pyranometer by inserting the cable connector to the connector on the
body then turn the screw cap.
*Make sure to check the pin layout of the connector before connecting the cable. If the connector cannot
be easily inserted, DO NOT use any force as it will damage the connector. Visually check the pin layout
again before retrying to insert the connector.
*Make sure to fasten the screw cap by turning it all the way.
*except for MS-80U
2) Connect the output cable:
2-1. How to Connect MS-80/80U [See Table 5-3. Wire Color Codes also]
Connect the wires with colors that correspond to each terminal to voltmeter or data logger.
*Always connect the shield cable. Failing to do so, it will lead to causing noise.
[*]Please select the ohmmeter or data logger which can measure the resistor value [Ω], in case of
measuring the detector temperature [Pt100 Class A]. Please also see theAppendixA-8.
Fig. 5-3A. How to connect MS-80
+
Measurement
Device
-
SG
Pt100 [B]
Pt100 [B]
Pt100 [A]
[*]Ω

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[**]Please select the ohmmeter or data logger which can measure the resistor value [Ω], in case of
measuring the detector temperature [NTC 10k Ω@25 degC]. Please also see the Appendix A-7.
2-3. How to Connect MS-80S [See Table 5-4. Wire Color Codes also]
A] How to connect 4-20mA. Connect the output cable end, DC power supply [5 to 36 V], and
ammeter as shown in the figure below. Install a fuse [0.5A] in series between the DC power supply
[+] and the MS-80S connection as shown below for over current protection.
* When precision resistors are connected in parallel and acquired at voltage value, keep the
precision shunt resistor maximum value at 150Ω. (Minimum tolerance 0.1% / 15 ppm).
B] How to connect 0-1V [optional]
The default output is 4-20mA. If 0 to 1V output is not selected as a purchase option, 0 to 1V output
is off. Or the setting can be changed with the 485 / USB conversion cable and dedicated software.
Connect the output cable end, DC power supply [5 to 36 V], optional precision resistor 100Ω[*
please prepare resister separately], and voltage measurement device as shown in the figure below.
Install a fuse [0.5A] in series between the DC power supply [+] and the MS-80S connection as
shown below for over current protection.
Fig. 5-3B. How to connect MS-80U
[**] NTC[Ω]
+
Measurement
Device
-
SG
Fig. 5-3D. How to connect MS-80S
Power supply
DC5V to 36V
-
+
0 to 1V input
Measurement
Device
+
-
fuse[0.5A]
R
Fig. 5-3C. How to connect MS-80S
Power supply
DC5V to 36V
-
+
4 to 20mA input
Measurement Device
+
-
fuse[0.5A]

EKO INSTRUMENTS CO., LTD. - Pyranometer MS-80/80S/80U - Instruction Manual Ver. 4
Pg. 17
C] How to connect Modbus RTU
Connect the output cable end and DC power [5 to 36 V], RS485 / USB converter or data logging
device as shown in the figure below. Install a fuse [0.5A] in series between the DC power supply
[+] and the MS-80S connection as shown below for over current protection.
D] How to connect SDI-12
Connect the output cable end, DC power supply [12 V], and data logging device as shown in the
figure below. Install a fuse [0.5A] in series between the DC power supply [+] and the MS-80S
connection as shown below for over current protection.
When connecting to a PC
When connecting to a Data Logger
Power supply
DC12V
+
-
Data collection device
SDI-12
+
-
fuse[0.5A]
Fig. 5-3G. How to connect MS-80S
Fig. 5-3F. How to connect MS-80S
Power supply
DC5V to 36V
+
-
Data collection device
RS-485 Modbus
-
fuse[0.5A]
+
Fig. 5-3E. How to connect MS-80S
Power supply
DC5V to 36V
+
-
RS485/USB
Converter
+
-
fuse[0.5A]
PC

EKO INSTRUMENTS CO., LTD. - Pyranometer MS-80/80S/80U - Instruction Manual Ver. 4
Pg. 18
2-3. How to Connect Communication with Modbus RTU
MS-80S can connect to a system that communicates with Modbus RTU by using RS-485.
Maximum of 100 units can be connected, and individual address can be assigned.
Connection of MS-80S to the RS-485 communication network is shown below.
Master represents the data-logging device [such as PC], and slaves represent devices such as
MS-80S. Connect the + and –for the master to [A] and [B] for each MS-80S. Also at the end of
network, connect a 120Ωtermination resistor
Modbus address is the last 2 digits of the product serial number. If the last 2 digits are “00”, the
address will be “100”.
[*]Communication errors may occur depending on the connection distance and the number of
connections. In that case, please use RS485 booster or repeater.
Figure 5-4. Communication Connection with Modbus RTU
2-4. How to Connect Communication with SDI-12
Make sure the cable length between the connecting slave [such as pyranometers] and data
collecting device to be less than 60m. Shield must be connected, or noise may occur.
Also see 7-3. Output Cable for cable arrangements.
Figure 5-5. Communication Connection with SDI-12
SDI-12 Data
DC-12V+
Ground
Slave
No.n
Slave
No.1
Slave
No.2
Slave
No. 3
Data collection
Device
Figure 5-4. Communication Connection with Modbus RTU

EKO INSTRUMENTS CO., LTD. - Pyranometer MS-80/80S/80U - Instruction Manual Ver. 4
Pg. 19
2-5. Wire Assignments
Also see [7-3. Output Cables].
Table 5-4. Wire Color Codes [MS-80 / 80U]
Table 5-5. Color Codes of cable[MS-80S]
No.
Cable Color
4-20mA
Modbus
SDI-12
0-1V *
1.
Brown
DC5 to 36V [+]
DC5 to 36V [+]
DC12V
DC5 to 36V [+]
2.
White
4-20mA [-]
/ GND
GND
GND
0-10mA[-]
/ 0-1V[-] / GND
3.
Blue
---
RS485/B/+
SDI-12 Data
---
4.
Black
---
RS485/A/－
---
---
5.
Gray
4-20mA [+]
---
---
0-10mA[+]
/ 0-1V[+]
Shield
Shield
FG
FG
FG
FG
*When selecting 0-1V output, a precision resistor is required separately. The output depends on the
accuracy of the resistor.
No.
Cable Color
MS-80
MS-80U
MS-80
MS-80U
1.
Brown
Red
mV [+]
mV [+]
2.
White
White
mV [-]
mV [-]
3.
Blue
Green
Pt100 [B]
NTC
4.
Black
Black
Pt100 [B]
NTC
5.
Gray
-
Pt100 [A]
---
Shield
Shield
Shield
FG
FG
Figure 5-6. Connector pin number of MS-80/80S
Each number corresponds to the number in Table 5-4.
There is no corresponding figure for MS-80U because the cable can’t be removed from MS-80U body.