1. Index. 1. Index 1 2. Important User Information Contact Information 2

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2 1. Index 1. Index 1 2. Important User Information Contact Information Warranty and Liability About Instruction Manual Environment 3 3. Safety Information WARNING/CAUTION HIGH VOLTAGE WARNING 4 4. Introduction Main Functions Package Contents 6 5. Getting Started Parts Name and Descriptions Setup W iring 9 6. Measurement Principle Thermistor Version: Measurement & Calculation Pt100 Version: Measurement & Calculation Dome Temperature Compensation (Option) Maintenance & Troubleshooting Calibration and Measurement Uncertainty Maintenance Compensation Circuit (Thermistor Version Only) Troubleshooting Specification Main Unit Dimensions Accessories List 22 APPENDIX 23 A-1. Temperature Radiation Relationships 23 A-2. Relationship of Dome Transmittance & Radiation 27 EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 1

3 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 EKO INSTRUMETNS Co., Ltd Hatagaya, Shibuya-ku Tokyo, Japan Europe, Middle East, Africa, South America Region EKO INSTRUMENTS Europe B.V. Lulofsstraat 55, Unit 32, 2521 AL Den Haag, The Netherlands North America Region EKO INSTRUMENTS USA Inc South Market Street, Suite 300 San Jose, CA USA Tel: +81 (3) Fax: +81 (3) Tel: +31 (0) Fax: +31 (0) Tel: Fax: 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. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 2

4 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: 2016/09/26 Version Number: 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. EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 3

5 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 WARNING/CAUTION 1. Setup The installation base or mast should have enough load capacity for the instrument to be mounted. Fix the pyrgeometer 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. 2. Silicon Dome Part Do not give impact to the silicon dome part as it may damage the dome, and cause serious injury. 3. Ventilation Unit Be careful when handling the ventilation unit during operation. Fingers or clothing may get caught into the ventilation fan, which can lead to serious injuries HIGH VOLTAGE WARNING 1. Power Supply (only for MS-202F) For AC versions of the ventilation units make sure to ground the earth wire of the power cable. When the power supply is not grounded, it may cause noise on the data and lead to measurement errors. Furthermore, grounding the earth wire will prevent electric shocks and current leakage. Make sure to check the power supply voltage and type (AC/DC) before connecting the fan unit to the power supply. Connecting the fan unit to other power supplies than specified will lead to damage and accidents EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 4

6 4. Introduction Pyrgeometer MS-202 / MS-202F (with ventilation fan) is designed to measure long-wave radiation. A specially coated silicon dome transmits incident radiation of wavelength longer than 3μm by cutting the short-wave radiation off completely in daytime. There are following 3 types of output available: 1. Thermopile (voltage) with 1 temperature measuring point 2. Thermopile (voltage) & Platinum Resistant Temperature Sensor (4-wire Pt100) with 1 of each temperature measuring point 3. Thermopile (voltage) with 1 temperature measuring point & Platinum Resistant Temperature Sensor (4-wire Pt100) with 2 temperature measuring points The compensation circuit that uses a thermistor temperature sensor outputs data of long-wave radiation by adding a radiation emitted from a detector Main Functions 1. Cuts out the wavelength less than 3μm which makes possible to measure the long-wavelength radiation 2. MS-202/202F is durable and continuous outdoor measurement can be taken for a long period of time. 3. With integrated arithmetic circuit, the thermistor version MS-202/202F directly outputs the voltage proportional to the incident radiation amount. EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 5

7 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-202/MS-202F 1 Thermistor or Pt-100 version Fixing Bolts 1 set MS-202:M6 x 75 bolt, washer and nut (2pcs/each) MS-202F:M6 x 100 bolt, washer, and nut (2pcs/each) Signal Cable 1 Standard length:10m Power Cable (only MS-202F) 1 Standard length:10m Inspection Report 1 Instruction Manual 1 EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 6

8 5. Getting Started 5-1. Parts Name and Descriptions Each part name and its main functions are described below. MS-202 MS-202F Fixing Holes (8φM6) Spirit Level Sensor Output Connector Spirit Level Output Connector Silicon Dome Sensor Surface Drying Cartridge Ventilation Unit Silicon Dome Ventilation Power Connector Cover Compensation Circuit * Fixed Foot Leveling Screw Lithium Battery* Fixed Foot Leveling Screw Figure 5-1. MS-202/202F Parts Name *Applicable only to the thermistor version MS-202/202F EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 7

9 5-2. Setup In order to obtain representative measurements from pyrgeometers, several criteria with respect to setup and mounting of the instruments have to be considered: The ideal mounting position for pyrgeometers is a location which has a full hemispheric field-of-view without any obstructions (such as buildings, trees, and mountain). In practice, it might be difficult to find such locations. Therefore, some practical recommendations on how to minimize undesired effects of reflecting or obstructing surfaces are given next: Select a mounting position which it is free from obstructions at 5 above horizon. The setup location should be easily accessible for periodic maintenance (silicon dome cleaning, desiccant replacement, etc.). Avoid surrounding towers, poles, walls or billboards with bright colors that can reflect solar radiation onto the pyrgeometer. A strong physical impact to the pyrgeometer can lead to product damage and/or may cause changes to the sensitivity. 1) Check the installation base where the pyrgeometer 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 5-1. Fixing Hole Pitch and Bolt Size for Pyrgeometers MS-202 MS-202F Fixing Hole Pitch 100 mm 150mm Fixing Bolt Size M6 x 75mm M6 x 100mm 2) Setup the pyrgeometer 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 connector is in the direction of the Sun, the temperature of the connector part increases; to prevent from the output error caused by thermoelectric power generating, keep the connector away from the excess sun exposure, 3) Adjust the pyrgeometer in a horizontal position by using the 2 leveling screws by observing the air bubble in the spirit level while manipulating the leveling screws. The instrument is leveled horizontally if the air bubble is in the center ring. 4) If the pyrgeometer is not leveled properly, the pyrgeometer readings are affected by cosine and azimuth errors. Periodically check the spirit level and adjust the pyrgeometer s position if necessary. 5) Fasten the pyrgeometer to the base with the 2 bolts (included). EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 8

10 5-3. Wiring 1) To extend the cable life time, 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 EM noise, such as an AC power supply, high voltage lines or telecom antenna. 2) Connect the output cable to the pyrgeometer. 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. 3) Connect the other end of the output cable to the signal tester or data logger 4) Check the output voltage. If a large noise is seen in the output voltage signal, try to connect the shield to (-) minus input terminal. *Connecting shield cable does not mean the noise will be removed, thus make sure to keep away from possible source of noise when wiring. 5) When a pyrgeometer with a ventilation unit is installed, connect the power cable. Make sure to ground the earth terminal (green cable) attached to the power cable (AC versions only). When the power is switched on, check whether the ventilation unit is working properly by placing your hand above the pyranometer to feel the air stream. EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 9

11 1. Thermistor Version MS-202 Connection Dome Temperature Body (Sensor) Temperature Thermistor Thermopile 35.7kΩ 3V kΩ 50Ω (Red) + B Rout C Rnet A - (Brown) F (Blue) G (Gray) E (White) D (Green) (Yellow) Rin Option Figure 5-2. Thermistor Version: Wiring Table 5-2. Cable Connections: Thermistor version with and without dome temperature sensor Body (Receptacle) MS-202 Thermistor without Dome Temperature Signal Cable Color +/- Crimping Terminal Color MS-202 Thermistor with Dome Temperature (Option) Signal Cable Color +/- Crimping Terminal Color Common A Brown - Blue Brown - Blue Output (Includes compensating circuit) Output (only thermopile) B Red + Red Red + Red C Yellow + Red Yellow Red Body Temperature D Green Blue Green Blue Body Temperature E White Blue White Blue Dome Temperature (Option) Dome Temperature (Option) F Blue Blue G Gray Blue EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 10

12 2. Pt100 Version MS-202 Connection Thermopile Output Body (Sensor) Temperature Dome Temperature (+) (-) (A) (B) (B) (A) (A) (B) (B) (A) A C D E E D F G G F Option Figure 5-3. Pt100 Version: Wiring Table 5-3. Cable Connections: Pt-100 version with and without dome temperature sensor Body (Receptacle) Signal Cable Color MS-202 Pt-100 without Dome Temperature +/- Crimping Terminal Color MS-202 Pt-100 with Dome Temperature (Option) Signal Cable Color +/- Crimping Terminal Output (-) A Red - Blue Red - Blue Output (+) C Brown + Red Brown + Red Color Body Temperature pt(a) Body Temperature pt(b) Dome Temperature pt(a) (Option Dome Temperature pt(b) (Option D E F G Yellow A Blue Orange A Blue Green A Blue Blue A Blue Blue B Blue Yellow B Blue Gray B Blue Green B Blue Yellow Green or Purple A Blue Black A Blue Gray B Blue White B Blue EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 11

13 6. Measurement Principle Pyrgeometer measures the exchange of a terrestrial radiation in distance between the thermopile detector (black painted) and the objects (gases, aerosols, clouds and ground surface). Rin Rout 1) According to the Stefan-Bolzmann s law, the detector with the temperature T emits the radiation corresponding to σt 4 while it is heated in receipt of radiation from the sky. As a result from these radiation exchanges, the difference between the temperature on the detector and that of the reference point is measured as the output by the thermopile. T Figure 6-1. Measurement Principle 2) When the incident radiation reaching the surface of the detector is Rin and the radiation emitted from the detector is Rout, then net radiation flux at the detector Rnet is a balance between the both : Rnet = Rin - Rout Where Rnet is output as voltage from the detector and Rout is obtained from the measurement of the temperature on the detector (body). Consequently, Rin = Rnet + Rout the radiation from the object Rin can be obtained Thermistor Version: Measurement & Calculation 1) Use Rin output Measure the output voltage between the terminal B(+) and A (-). (Vab) Then obtain radiation data from the following formula. Rin = V/S(kW/m 2 ) S : Calibration constant given by the calibration certificate 2) Precise calculation Obtain radiation data from net radiation data (Rnet) and radiation of detector by measuring them separately. First, measure the output voltage between the terminal C(+) and A(-), (Vac), to obtain net radiation Rnet = Vac/S(kW/m 2 ) Then Measure a resistance between the terminal E and D. By using table 2 (Resistance and Temperature), figure a temperature of the detector (T, absolute temperature). EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 12

14 Next, determine a radiation from table 1 (Temperature and Radiation) Finally the incident radiation will be determined from the following formula. Rin = Rnet+σT 4 Where σ is defined as the Stefan-Bolzmann s constant value ( x 10^-8(W/m 2 K^-4)) Pt100 Version: Measurement & Calculation Measure the voltage between the thermopile output (+) -- (-) and the sensor surface temperature (T) separately. First, determine the net radiation by applying the thermopile voltage output in the following formula. Rnet=V/S(kW/m 2 ) S : Calibration constant given by the calibration certificate Next, figure out the radiation by measuring the temperature of detector and convert the temperature into absolute temperature from the following formula. (See the Appendix table for the relationships between the temperature and radiation). Rin=Rnet+σT 4 Note: Refer to JIS C1604 (1997) or equivalent standard for details on using Pt Dome Temperature Compensation (Option) To optimize the measurement accuracy of the radiation, the secondary radiation data is compensated by the dome which temperature increases. In order to do so, either thermistor or Pt100 which is to measure the dome temperature directly, is installed. To compensate the dome temperature, follow below procedures: Rin=(V/S) x 1000+σT^4+kσ x (T^4-Td^4) Where: k: Dome constant by the certificate Td: Dome temperature (K) T: Body temperature (K) V: Output voltage from the detector (mv) a(-),c(+) S: Calibration constant by the certificate (mv/kw/m 2 ) σ: Stefan-Boltzmann constant ( x 10^-8(W/m 2 K^-4)) EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 13

15 1. Pt100 Version Compensation Refer to JIS C1604 (1997) or equivalent standard for details on using Pt100. Range of : R t=r 0 [1+At+Bt 2 +C (t 100) t 3 ] (1) Range of : R t=r 0 (1+At+Bt 2 ) (2) Where: A= B= C= NOTE: R 0 is the resistance value at 0 R t is the resistance value at t 2. Thermistor Version Compensation The resistance output from the thermistor for measuring the dome temperature can be acquired from the output between the terminal F and G. 1) Measure the resistance between the terminals F and G. 2) By using the Appendix table or the following formula, the temperature at resistance R can be determined. 1) Thermistor B Constant The thermistor B Constant is a specific constant for the thermistor used when the resistance value between 2 points of temperature with given resistance value is calculated; it is determined by composition of the thermistor element and baking conditions. When the 2 points of temperatures are t 1 and t 2 and thermistor resistance are R 1 and R 2, the B is calculated by the following formula. B = ( log R 1 - log R 2 ) 1-1 T T Where: B: Thermistor Constant (K) t 1, t 2: Temperature ( ) R 1: Thermistor resistance (Ω) at temperature t 1 R 2: Thermistor resistance (Ω) at temperature t 1 2) Interpolating the Thermistor Resistance at Desired Temperature Using Thermistor B Constant When B constant value is calculated at near a certain temperature, the temperature coefficient α [the rate of change in thermistor resistance by the changes in temperature of 1 {1K}(*)] for the thermistor resistance at such temperature can be given by the following formula: α = - B EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 14

16 (t ) 2 Therefore, the rate of change in the resistance per 1 {1K}(*) can be determined by Rα using the thermistor resistance R at this specific temperature in approximation. If α results in minus value, it means that the thermistor resistor change rate becomes smaller as the temperature of thermistor resistance gets higher. Also to determine the thermistor resistance R at the temperature τ with the thermistor resistance at the temperature t 0 as R 0, use the thermistor B constant which was calculated for the temperatures t 0 and t 1 close under the condition of t 0<t<t 1 in the following formula: R = R 0 exp B t t Where: B: Thermistor Constant (K) t 0: Initial Temperature ( ) t: Temperature which resistance value to be determined ( ) R 0: Thermistor resistance at the temperature t 0 (Ω) R: Thermistor resistance at the temperature t (Ω) Note: The units and values which are indicated with {} brackets in this section are according to the International System of Units (SI). EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 15

17 7. Maintenance & Troubleshooting 7-1. Calibration and Measurement Uncertainty It is recommended to recalibrate the instrument once every 1~2 years. For further information about the calibration and recalibration, please contact EKO Maintenance To maintain accurate measurement, it is recommended to check and do the following: Table 7-1 Maintenance Check Items Frequency How To Effect Clean Silicon Dome Few times per week (At least once per week) Keep the silicon dome clean by wiping it with a soft cloth and alcohol. If the silicon dome gets soiled (by accumulation of dirt) the detector output will be affected due to a change in transmittance. Check Silicone Dome Condition Weekly Check for cracks and scratches on the silicon dome and the rim. May lead to water leakage due to rain/dew which causes damage of the detector inside the pyrgeometer. Check Spirit Level Bubble Weekly Verify if the pyrgeometer is leveled by checking the bubble is in the center ring of spirit level. (When the pyrgeometer is setup in horizontal position) If a pyrgeometer in the horizontal measurement position is not leveled correctly an additional cosine/azimuth error will be introduced. Verify if the cable connector is A disconnected cable will cause sporadic Check Cable Condition Weekly properly connected, tightened to the instrument, and how cable is lined; make sure the cable is not reading errors or failure of operation. If the cable is damaged, it may lead to noise or electric shock (ventilator AC power swinging by wind. cable). Check if the instrument is Check Setup Base Condition Weekly tightened properly to the mounting base plate and the base plate and/or table is securely fastened in a proper Loose instruments and/or mounting plates can lead to damages of the instruments and/or injury. condition. Check 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. With moisture saturated silica gel gives condensation inside the dome which leads to a lower detector output or damage. EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 16

18 Table 7-1 Maintenance - Continued Check Items Frequency How To Effect If the thermistor version Check Trimmer Adjustment Seasonal pyrgeometer is used with the compensation circuit, make sure the trimmer is adjusted according to the ambient If the trimmer is not adjusted according to the ambient (seasonal) temperature change, the measurement error will occur. (seasonal) temperature change. Replace Lithium Battery Every 7 months Replace the battery by the instruction in the [7-3. Battery Replacement Procedure (Thermistor Version)]. The measurement accuracy will decrease due to low voltage. If the compensation circuit is not used, remove the lithium battery as the battery may lead to deterioration. To maintain the best possible Recalibration Every 2 Years measurement accuracy, regular recalibration of the pyrgeometer is recommended. Contact EKO for more details and requests for a recalibration and maintenance Due to natural aging of materials the detector properties of the pyrgeometer can change in time which affects the sensor sensitivity. service. EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 17

19 7-3. Compensation Circuit (Thermistor Version Only) Pyrgeometer MS-202/MS-202F has the thermistor-battery-resistance circuit to compensate the radiation that is emitted from the detector. Amount of the radiation Rout (=σt 4 ) corresponding to the temperature on the detector is given as voltage to be put out from a resistance of the thermistor, in addition to output from the thermopile Rnet. Hence, the radiation Rin from an object is measured as output voltage. By adjusting the variable resistance, the circuit will be calibrated. Dome Temperature Body (Sensor) Temperature Thermistor Thermopile 35.7kΩ 3V kΩ 50Ω (Red) + B Rout C Rnet A - (Brown) F (Blue) G (Gray) E (White) D (Green) (Yellow) Rin Option Figure 7-1. Thermistor Version: Wiring Circuit diagram is shown as Figure 7-1. Voltage between (A) and (C) corresponds to Rnet is output from the thermopile detector. Voltage between (B) and (C) represents Rout that is output from the compensation circuit. Hence, the amount of radiation from an object can be measured as voltage between (A) and (B). In addition to the thermistor of the compensation circuit, another thermistor is equipped to measure temperature of the detector at (E) and (D) enables the precise measurement of radiation. 1. Calibration of the Compensation Circuit 1) To find the temperature of detector, measure a thermistor resistance between terminal (E) and (D). Read out the absolute temperature T from the table2 Resistance versus Temperature. 2) Considering the pyrgeometer sensitivity indicated on the calibration table at this time as S(mV/kW m -2 ) and the Stefan-Biotzmann constant as following formula: σ= x kw/m -2 deg -4 The voltage between the terminal B(+) and C(-) can be calculated from the below formula. σt = Vbc S (kw/m 2 ) EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 18

20 3) Adjust the voltage between B and C (Vbc) to the value determined in the previous step by using the trimmer inside the pyrgeometer. The trimmer can be accessed and adjusted by removing the drying cartridge, and the calibration is complete. Finally measure the voltage (Aab) between the A and B, dividing the Vab by sensitivity S to determine the long-wave radiation Rin. Rin = Vab/S(kW/m 2 ) NOTE: This calibration is required when the battery is replaced, as well as when making adjustments by the seasonal temperature changes. 2. Lithium Battery Replacement for Compensation Circuit MS-202/MS-202F uses Lithium battery for the compensation circuit, and it is mounted inside the pyrgeometer body. If the compensation circuit is not used, the battery is not needed for operation; to avoid the battery getting corroded, remove the battery. 1) Remove the desiccants holder by rotating. 2) Unscrew the 6 screws on the bottom plate and slowly remove the bottom plate from the body. Be careful not to damage the wires inside. 3) By removing the screws which holding the electrode plate, battery can be removed. (The electrode plate which is connected to the circuit board may come off during this step. If the electrode plate came loose, just insert it back in its place.) 4) Replace the battery with a new one. 5) Reassemble the sensor by following this process in reverse order. Make sure the + side of electrode plate makes a good contact with the battery. After the battery replacement, calibrate the compensation circuit by following the above section [7-3. Compensation Circuit (Thermistor Version Only)], [1. Calibration of Compensation Circuit] NOTE: The battery life will be approximately 7 months. (Cylindrical type Lithium Battery, type CR123A, by Panasonic) EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 19

21 7-4. 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 Output value is too low Silica gel has changed its color Unusual noise coming from the ventilation unit (only applicable to MS-202F) Make sure that the sensor cable is connected properly to the instrument. To verify the connection, measure the impedance of output cable (between the + and the - wires) and check if the measured impedance is within the proper range as shown on the specification. (See 8. Specifications) Check whether the data acquisition device is setup with proper measurement range. The silicon dome maybe soiled with rain or maybe contaminated. Clean the silicon dome with a soft cloth. Replace the silica gel. Remove the drying cartridge from the pyrgeometer housing, open the cap at the inner end of the small tube and replace the silica gel. Possibly some objects, such as leaves or trash, got stuck in the ventilation unit. Stop the ventilation unit and check for any objects near or in the ventilator. The noise of the ventilation unit may increase due to aging. In such a case, contact EKO for replacement. EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 20

22 8. Specification 8-1. Main Unit Table 8-1. Main Unit Specification MS-202 MS-202F Sensitivity Approx. 4mV/kW m -2 Internal Resistance Response Time Approx. 300Ω 3.0s (1-1/e) Non-Linearity ±1% Spectral Range 3μm~50μm Operation Temperature Range -20 ~ +40 Accuracy ±5% Temperature Sensor Dome Temperature Sensor (Option) Battery (Only Thermistor Version MS-202/202F) Pt-100Ω or Thermistor Pt-100Ω or Thermistor Lithium Battery: CR-123A 3V Lifetime: 7 Month Dimension 130φ x 120H mm 180φ x 140H mm Weight Approx. 2kg Approx. 3kg Ventilation Power Supply (Specified) --- DC12V 0.17A or AC100V 50/60Hz 12/10W EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 21

23 8-2. Dimensions Figure 8-1. MS-202/MS-202F Dimensions 8-3. Accessories List Table 8-2. Accessories List Option Items Remarks Output Cable Power Supply Cable Silica Gel Replacement 20m, 30m, 50m AC100, AC220, or DC12/24V, 20m, 30m, 50m Silica gel (descants) bottle (500g) EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 22

24 APPENDIX A-1. Temperature Radiation Relationships σ= W m-2 K-4 T = θ Table A-1. Conversion from Temperature to Radiation EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 23

25 Continued 2 σ= W m-2 K-4 T = θ EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 24

26 Continued 3 σ= W m-2 K-4 T = θ EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 25

27 Table A-2 EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 26

28 A-2. Relationship of Dome Transmittance & Radiation Figure A-1 Relationships of Dome Transmittance and Radiation EKO INSTRUMENTS CO., LTD. Pyrgeometer MS-202/MS-202F Instruction Manual Ver.3 Pg. 27

29