EKO Instruments MS-212W User manual

UV-B Radiometer
MS-212W
Version Number: 2
INSTRUCTION MANUAL

EKO INSTRUMENTS CO., LTD. UV-B Radiometer MS-212W Instruction Manual Ver. 2
Pg. 1
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
3. Safety Information 4
3-1. WARNING/CAUTION 4
4. Introduction 5
4-1. Main Functions 5
4-2. Package Contents 6
5. Getting Started 7
5-1. Parts Name and Descriptions 7
5-2. Setup 8
5-3. Cable Connections 9
5-4. Measurement 11
5-5. Checking the Optical System Temperature 11
6. Measurement Principle 12
6-1. UV-B Radiometer Measurement Principle 12
7. Maintenance & Troubleshooting 13
7-1. Maintenance 13
7-2. Calibration and Recalibration 14
7-3. Troubleshooting 15
8. Specification 16
8-1. Specifications 16
8-2. Dimensions 17
8-3. Accessories List 19

EKO INSTRUMENTS CO., LTD. UV-B Radiometer MS-212W Instruction Manual Ver. 2
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2. Important User Information
Thank you for using EKO Products
Make sure to read this instruction manual thoroughly and to understand the contents before starting to operate the
instrument. Keep this manual at safe and handy place for whenever it is needed.
For any questions, please contact us at one of the EKO offices given below:
2-1. Contact Information
EKO INSTRUMENTS CO., LTD.
Asia, Oceania Region
www.eko.co.jp
[email protected]
EKO INSTRUMETNS Co., Ltd.
1-21-8 Hatagaya, Shibuya-ku
Tokyo, 151-0072 Japan
Tel: [phone]
Fax: [phone]
Europe, Middle East, Africa Region
www.eko-eu.com
[email protected]
EKO INSTRUMENTS Europe B.V.
Lulofsstraat 55, Unit 32,
2521 AL, Den Haag, The Netherlands
Tel: [phone]
Fax: [phone]
North & South America Region
www.eko-usa.com
[email protected]
EKO INSTRUMENTS USA Inc.
95 South Market Street, Suite 300
San Jose, CA 95113 USA
Tel: [phone]
Fax: [phone]
2-2. Warranty and Liability
For warranty terms and conditions, contact EKO or your distributor for further details.
EKO guarantees that the product delivered to customer has been verified, checked and tested to ensure that
the product meets the appropriate specifications. The product warranty is valid only if the product has been
installed and used according to the directives provided in this instruction manual.
In case of any manufacturing defect, the product will be repaired or replaced under warranty. However, the
warranty does not apply if:
Any modification or repair was done by any person or organization other than EKO service
personnel.
The damage or defect is caused by not respecting the instructions of use as given on the product
brochure or the instruction manual.

EKO INSTRUMENTS CO., LTD. UV-B Radiometer MS-212W Instruction Manual Ver. 2
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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: 2015/06/11
Version Number: 2
2-4. Environment
1. WEEE Directive 2002/96/EC
(Waste Electrical and Electronic Equipment)
This product is not subjected to WEEE Directive 2002/96/EC however it should not be mixed with general
household waste. For proper treatment, recovery and recycling, please take this product(s) to designated
collection points.
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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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.
3-1. WARNING/CAUTION
1. Setup
Fix the MS-212W with bolts and nuts on the mounting base, or MS-212W may drop by gale or
earthquake and lead to unexpected accidents.
Avoid high temperature and humidity environment for the Converter installation.
2. Grounding
Always connect to grounding when MS-212W is newly installed or reinstalled in a different location.
Improper grounding may cause electric shock and leakage.
3. Power Supply
Make sure the power supply voltage and types (AC, DC) are appropriate for MS-212W before connecting the
power supply.
4. Handling
Glass Dome
Do not give impact to the exposed quartz dome part or it will break. Scattered broken glasses
may cause accidents and injury.
Plastic Parts: Sun Screen
The Sun Screen part of the MS-212W is made of plastic, and it does not have sufficient strength to
hold the sensor body.
When carrying the MS-212W, hold the body part instead of just the Sun Screen part. Sun Screen
may come off and drop the sensor itself.

EKO INSTRUMENTS CO., LTD. UV-B Radiometer MS-212W Instruction Manual Ver. 2
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4. Introduction
UV-B Radiometer MS-212W is an all-weather type UV radiometer which can continuously measure the irradiance
in the UV-B range (280 to 315nm).
Ozone layer takes an important role in protecting the living organisms such as human by absorbing the harmful
ultraviolet radiation from the sun.
UV radiations are usually categorized into 3 types: UV-A irradiance (315 to 400nm), UV-B irradiance (280 to
315nm), and UV-C irradiance (below 280nm). Only little UV-A irradiance is absorbed by the ozone, thus it does
not get much effects from the changes with ozone layer; on the other hand, the UV-C irradiance is completely
absorbed by the ozone, thus it does not reach the earth ground. However, the UV-B irradiance varies significantly
by the ozone amount and is harmful to the living organisms, it is also called “hazardous UV ray”generally.
There is only 0.2% of global UV-B irradiance reaching the ground even at the maximum, and the angular
distribution and spectral distribution of the incident light vary significantly by the atmospheric conditions. To
remove these effects and take accurate measurements, MS-212W is integrated with special optical system. Also
to be able to take stable measurements in varying ambient temperature, MS-212W has temperature control
function.
4-1. Main Functions
1. Measures UV-B Range Irradiance
2. Measures Highly Accurate and Stable UV Irradiance
3. Traceable to NIST Standard Lamp
4. Temperature Control Function for Optics
5. Waterproof Design Allowing Constant Measurements

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4-2. Package Contents
Check the package contents first; if any missing item or damage is noticed, please contact EKO immediately.
Table 4-1 Package Contents
Standard Items
Qty.
Remarks
MS-212W Sensor
1
Converter
1
Sensor Cable
1
10m (20m, 30m cables available by option)
Signal Cable
2
1.5m
Power Supply Cable
1
2.5m
Fixing Bolts, Nuts, and Washer
2 Sets
M6 x 75mm
Fuse
2
φ5.2 x 20, 250V, 2A for replacements
Inspection Report
1
Instruction Manual
1

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5. Getting Started
5-1. Parts Name and Descriptions
Each part name and its main functions are described below.
1. MS-212W Sensor
2. MS-212W Converter
Figure 5-1. MS-212W Sensor Parts Name
Quartz Dome
Sensor
Sun Screen
Drying Cartridge
Sensor Body
Cable Connector
Fixed Leg
Leveling Screws
Sensor Cable
Spirit Level
Figure 5-2. MS-212W Converter Parts Name
Power Switch
Terminal Block
Fuse
Power Supply
Connector

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5-2. Setup
1. Installation Location
In order to obtain representative measurements from spectroradiometers, several criteria with respect to
setup and mounting of the instruments have to be considered:
Select a mounting position which it is free from obstructions at 5°above horizon.
Avoid surrounding towers, poles, walls or billboards with bright colors that can reflect solar radiation onto
the spectroradiometer.
The setup location should be easily accessible for periodic maintenance (quartz dome cleaning,
desiccant replacement, etc.).
2. Installation Procedure
MS-212W Sensor Installation
1) Make sure the fixing holes are already
prepared on the mounting base for the
MS-212W. Refer to the image on the right
for the fixing holes pitch.
2) Place the MS-212W with drying cartridge
facing towards South (connector facing
towards North). (In case of installation in
southern hemisphere, drying cartridge
should face towards North and connector
towards South)
If the connector is exposed to the sun
direction, the connector temperature will
increase and will lead to output error by
thermoelectric power.
3) Remove the Sun Screen.
When removing the Sun Screen, always turn about 60 degrees angle in the Sun Screen in clockwise
direction. Turning in anti-clockwise direction may loosen the quartz dome holder.
When lifting up the MS-212W, always hold the metal part of the body instead of just the Sun Screen part.
Holding just the Sun Screen part may lead to breaking the Sun Screen and drop the instrument.
4) In order to properly install the MS-212W sensor surface in horizontal position, adjust the level by using
the 2 leveling screws.
5) Put the 2 bolts (M6 x 75mm) through the fixing holes (see drawing) on the MS-212W and tighten the
MS-212W with these 2 screws equally.
Make sure the MS-212W is securely fixed or it may lead to unexpected accidents by the instruments
dropping in case of earthquake and so on.
6) Place the Sun Screen, which was removed in Step 3, back on the MS-212W in clockwise direction again.
Installing Converter
Avoid installing the Converter in an environment which is high temperature and high humidity.
The Converter should be installed indoor as it is not designed with waterproof function.
Figure 5-3. MS-212W Fixing Holes Pitch

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5-3. Cable Connections
1. Sensor Cable
1) Connecting the Plug
Insert the Sensor Cable connector to the MS-212W receptacle and tighten the fixing screw securely
while pushing the cable connector into the receptacle.
If the Sensor Cable connector is not sufficiently pushed and then tightened, water may leak inside and
cause damages inside.
2) Connecting the Terminals
Connect the wires with terminals to the SENSOR side terminal block on the rear panel of the Converter.
Match the numbers on the wires and the Converter terminal block for connection. If connection made
with different numbers, it may lead to damaging the MS-212W and/or Converter or malfunction.
Figure 5-4. MS-212W Sensor Cable
Figure 5-5. MS-212W Terminal Connection

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2. Signal Cable
There are 2 types of outputs (V, mV, TEMP) from the OUTPUT side of the Converter rear panel.
V and mV are the outputs proportional to the A range UV irradiance, and these are the voltage outputs in
0.2±0.05V/W・m-2 and 2±0.5mV/W・m-2.(See the section 5-4 for the B range UV irradiance conversion)
TEMP. is the output for measuring the temperature of the optics (including interference filter, fluorescence
body, color glass filter, photodiode). (See section 5-4 for temperature conversion)
Connect the attached Signal Cable to either V or mV (select either one which is appropriate for the input level
on the data logger or data recording device). Connect the remaining Signal Cable to TEMP. output
measurements. The output corresponding to the optical system temperature is approximately 0.1V at 25℃;
it is used for monitoring the temperature of optical system, thus it is not necessary to connect since the
temperature measurements are not directly related to the UV-B irradiance measurements
Connect the other end of the Signal Cable to data logger or data recording device. If the connection is short
circuited, it may damage the MS-212W and/or Converter.
3. Power Supply Cable
Make sure the supplied power is within the range of AC100 to 240V and 50/60Hz 30W first then connect the
Power Supply Cable.
4. Grounding Wire
To avoid electric shocks and electric leakage, connect the No.10 (Terminal G) on the Converter rear panel or
grounding cable attached to the power supply cable top to ground
出力ケーブル
Figure 5-6. MS-212W Signal Cable
電源ケーブル
Figure 5-7. MS-212W Power Supply Cable

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5-4. Measurement
1. Power ON the Converter
Turn ON the POWER SW. of the Converter. (To turn ON the power, lift up the plastic cover and press the
green button; the lamp comes on when the power is ON.)
2. Measure
Start the measurements using the measuring device such as data logger.
3. Calculate UV Irradiance
There are 2 types (V, mV) of OUTPUT terminal on the Converter for UV irradiance output; the sensitivity value
is different depending on the output connection. Verify the inspection report for the subjected sensitivity and
calculate the UV irradiance using following formula.
UV-A Irradiance(W/m2)
＝
Output Voltage (V)
Sensitivity (V/W・m-2)
OR
＝
Output Voltage (mV)
Sensitivity (mV/W・m-2)
5-5. Checking the Optical System Temperature
The optical system inside the MS-212W is temperature controlled at 25℃. At the stable temperature control
condition, 0.1V±5mV voltages are output to the TEMP terminals (No. 15 & 16) which is located on the rear
panel of the Converter. By monitoring this voltage, it can be evaluated for good or bad temperature control
conditions.

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6. Measurement Principle
6-1. UV-B Radiometer Measurement Principle
MS-212W measures the UV radiation by extracting the UV radiation from the solar radiation through
interference filter, phosphor, and cut filter. The output from the optical receiver is amplified by the integrated
amplifier and output to the converter.
0.0
0.2
0.4
0.6
0.8
1.0
1.2
280 285 290 295 300 305 310 315 320
R elative Sensitivity
Wev elength(nm)
Spectral Response
Quartz Dome
Diffuser
Interference Filter
Phosphor
Cut Filter
Optical Receiver
Electrical Circuit
Output Signal
DC ±12V
Converter
Output Signal
AC 85～264V
Figure 6-1. MS-212W Structure and Wavelength Characteristics

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7. Maintenance & Troubleshooting
7-1. Maintenance
To maintain accurate measurement, it is recommended to check and do the following:
Table 7-1. Maintenance Items
Check Items
Frequency
How To
Effect of Neglecting the
Maintenance
Cleaning Glass
Dome
Few times per
week (At least
once per
week)
Keep the quartz dome / window clean
by wiping it with a soft cloth and alcohol.
If the quartz dome gets soiled
(by such as dirt, dew, and dusts),
it will lead to in accurate UV-A
irradiance measurements.
Replacing Silica
Gel
Monthly
Verify that the color of the silica gel is
dark blue (dark blue = okay). If the color
of the silica gel turns into a reddish color
then replace it with new silica gel. 2 to
4mm size silica gel are suitable.
When reattaching the drying cartridge,
make sure to sufficiently tighten the lid
so that the packing (O-ring) is
completely sealed. Incomplete sealing
will allow water to enter and causes
damages inside.
With moisture saturated silica
gel gives condensation inside
the dome which leads to a lower
detector output or damage.
Cleaning
MS-212W Body
Monthly
The body of the UV-A Radiometer is
designed with ridges for giving better
efficiency for thermal exchange. Use
brush to clean the ridges regularly.
The efficiency of the thermal
exchange will decrease if the
ridges are soiled with dusts and
dirt.

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7-2. Calibration and Recalibration
1. Calibration Procedure
MS-212W is calibrated by the following procedure.
First, calibrate the spectroradiometer specified for UV using the standard lamp which is traceable to the NIST
(National Institute of Standards and Technology) in the U.S. Next, take the comparison measurements
between this spectroradiometer and the product UV-B Radiometer for reference instrument using solar
simulator. Integrate the spectral irradiance to make this value as the UV-B irradiance and obtain the
calibration constant value by dividing the reference instrument output by this irradiance. Then take the
comparison measurements between the reference instrument and the product UV-B Radiometer to determine
the sensitivity of the product UV-B Radiometer. This sensitivity (calibration value) is guaranteed for one year
from the time of delivery.
2. Recalibration
Although the components used in the UV-B Radiometer are well selected, there are risks of deterioration in a
long term due to the UV radiation, heat, humidity and so on; therefore, it is important to check and recalibrate
the sensor.
In order to acquire highly accurate data, it is recommended to recalibrate the sensor once a year.
Figure 7-1. Traceability of UV Radiometers
Standard Lamp
Spectroradiometer
Reference Instrument
Product UV-B Radiometer
Traceability of UV Radiometers

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7-3. Troubleshooting
Check the following items in case of trouble with the instrument. If any questions should remain, contact
EKO for further technical support.
Table 7-2. Troubleshooting
Failure
Action
There is no output.
・Check the power is switched ON.
・Check whether the fuse is blown. If the fuse is blown, replace with a new fuse.
(φ5.2 x 20 250V 2A)
・Check the cable connection between the MS-212W Sensor and the Converter (See
Figure 5-5)
Output value is
significantly low.
・Check whether the quartz dome; if it is soiled, clean with soft cloth and alcohol.
・There are 2 types of terminals on the converter: Output in V (0.2±0.05V/W・m-2) and
output in mV (2±0.5mV/W・m-2). Check the signal cable connection.

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8. Specification
8-1. Specifications
Table 8-1. Sensor Specification
Characteristics
Details
Measurement Range
0 to 5W・m-2
Output
0 to 1V
0 to 10mV
Sensitivity
0.2±0.05V/ W・m-2
2±0.5mV/ W・m-2
Wavelength Range
280 to 315nm
Traceability
Traceable to NIST Standard Lamp
Cosine Response
< 10% (Incident Angle 0° to 70°)
Directional Response
< 10% (Incident Angle 0° to 70°)
Response Time
1sec (@90%)
Non-Linearity
< 2%
Impedance
10Ω (V)
100Ω (mV)
Operating Temperature
-10 to +50℃
Weight
1.1kg
Table 8-2. Converter Specification
Characteristics
Details
Power Supply
AC85 to 264V、50/60Hz
Power Consumption
< 30W
Output Voltage
±12.0V
Operating Temperature
0 to 40℃
Operating Humidity
10 to 90%RH (No condensation)
Weight
1.3kg

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8-2. Dimensions
1. MS-212W Sensor
Figure 8-1. MS-212W Sensor Dimensions

EKO INSTRUMENTS CO., LTD. UV-B Radiometer MS-212W Instruction Manual Ver. 2
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2. MS-212W Converter
Figure 8-2. Converter Dimensions
Converter Rear Panel

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8-3. Accessories List
Table 8-3. Accessories List
Option Items
Remarks
Sensor Cable
20m, 30m (for more than 30m long cable, please contact EKO)