Apogee Instruments MU-250 Owner'S Manual Download Page 9

OPERATION AND MEASUREMENT 

MU series quantum meters are designed with a user-friendly interface allowing quick and easy measurements. 

 

Press the power button to activate the LCD display. After two minutes of non-activity the meter will revert 

to sleep mode and the display will shut off to conserve battery life. 

 Press the mode button to access the main menu, where the appropriate unit (photon flux or energy flux) 

and manual or automatic logging are selected, and where the meter can be reset. 

 Press the sample button to log a reading while taking manual measurements. 

 Press the up button to make selections in the main menu. This button is also used to view and scroll 

through the logged measurements on the LCD display. 

 Press the down button to make selections in the main menu. This button is also used to view and scroll 

through the logged measurements on the LCD display. 

 

Units:

 To choose between units of energy flux (W m

-2

) or photon flux density (µmol m

-2

 s

-1

), push the mode button 

once and use the up/down buttons to make the appropriate selection. Once the desired mode is blinking, press 
the mode button three more times to exit the menu. 

Logging: 

To choose between manual or automatic logging, push the mode button twice and use the up/down 

buttons to make the appropriate selection (SMPL or LOG). Once the desired mode is blinking, press the mode 
button two more times to exit the menu. When in SMPL mode press the sample button to record up to 99 manual 
measurements (a counter in the upper right hand corner of the LCD display indicates the total number of saved 
measurements). When in LOG mode the meter will power on/off to make a measurement every 30 seconds. Every 
30 minutes the meter will average the sixty 30 second measurements and record the averaged value to memory. 
The meter can store up to 99 averages and will start to overwrite the oldest measurement once there are 99 
measurements. Every 48 averaged measurements (making a 24 hour period), the meter will also store an 
integrated daily total in moles per meter squared per day (mol m

-2

 d

-1

). 

 

 

The LCD display consists of the total number of logged 
measurements in the upper right hand corner, the real-time UV 
measurement in the center, and the selected menu options along 
the bottom. 

Summary of Contents for MU-250

Page 1: ...RUMENTS INC 721 WEST 1800 NORTH LOGAN UTAH 84321 USA TEL 435 792 4700 FAX 435 787 8268 WEB APOGEEINSTRUMENTS COM Copyright 2021 Apogee Instruments Inc OWNER S MANUAL ULTRAVIOLET METER Models MU 250 Rev 1 Jun 2021 ...

Page 2: ...roduction 4 Sensor Models 5 Specifications 6 Deployment and Installation 7 Battery Installation and Replacement 8 Operation and Measurement 9 Apogee AMS Software 11 Maintenance and Recalibration 13 Troubleshooting and Customer Support 14 Return and Warranty Policy 16 ...

Page 3: ... electrical and electronic products with respect to the restriction of hazardous substances Please be advised that based on the information available to us from our raw material suppliers the products manufactured by us do not contain as intentional additives any of the restricted materials including lead see note below mercury cadmium hexavalent chromium polybrominated biphenyls PBB polybrominate...

Page 4: ...The output can also be expressed in photon flux density units of micromoles per square meter per second µmol m 2 s 1 Typical applications of UV meters include incoming UV radiation measurement in outdoor environments or in laboratory use with artificial light sources e g germicidal lamps Apogee Instruments MU 200 series UV A meters are connected by cable to an anodized aluminum housing MU 250 Sepa...

Page 5: ...ee MU series UV meters covered in this manual are self contained and come complete with handheld meter and sensor MU 250 Sensor model number and serial number are located on a label on the backside of the handheld meter ...

Page 6: ...m Drift Less than 2 per year Non linearity Less than 1 Response Time Less than 1 ms Field of View 180 Spectral Range 300 nm to 400 nm see Spectral Response below Directional Cosine Response 2 at 45 5 at 75 zenith angle Maximum Range 104 9 W per m2 Temperature Response Less than 0 1 per C Operating Environment 0 to 50 C less than 90 non condensing relative humidity up to 30 C less than 70 non conde...

Page 7: ...he sensor to a horizontal plane In addition to leveling all sensors should also be mounted such that obstructions e g weather station tripod tower or other instrumentation do not shade the sensor The AM 310 Sensor Wand accessory incorporates a mounting fixture at the end of an extendable telescopic wand up to 33 inches 84 cm The wand is not suited for wet environments however it is excellent for g...

Page 8: ...om the meter circuit board NOTE The battery cradle can be damaged by using an incorrectly sized battery If the battery cradle is damaged the circuit board will need to be replaced To avoid this costly problem use only a CR2320 battery Battery Removal Press down on the battery with a screwdriver or similar object Slide battery out If the battery is difficult to move turn the meter on its side so th...

Page 9: ...ke the appropriate selection Once the desired mode is blinking press the mode button three more times to exit the menu Logging To choose between manual or automatic logging push the mode button twice and use the up down buttons to make the appropriate selection SMPL or LOG Once the desired mode is blinking press the mode button two more times to exit the menu When in SMPL mode press the sample but...

Page 10: ...surements and Spectral Errors Apogee Instruments model SU 200 UV A sensors are calibrated to measure ultraviolet radiation from the sun between 300 and 400 nm in Watts per square meter In addition to naturally occurring UV A radiation from the sun there are many electric light sources that emit UV A radiation e g cool white fluorescent metal halide mercury arc and germicidal lamps Although the rel...

Page 11: ...ds When the ApogeeAMS software is first opened it will show a blank screen until communication with the meter is established If you click Open Port it will say connection failed To establish communication make sure the meter is plugged into your computer using the AC 100 communication cable To connect click the dropdown menu button and COM options will appear For more details on how to figure out ...

Page 12: ...als per day Click 30 Min Avg to see the meter s 99 30 minute averages To analyze the data click on File and Save As to save the data as a csv file Or you can highlight the numbers copy and paste them into a blank Excel spreadsheet Data will need to be comma delimited ...

Page 13: ...imates and locations around the world Although the Clear Sky Calculator does not specifically report an estimated value for UV radiation it can still be used to help determine the need for UV sensor recalibration by approximating the ratio of UV to total shortwave or the ratio of UV to PPFD However due to continuous changes in atmospheric conditions and their effect on UV radiation the comparison ...

Page 14: ... section for details and cautions If a master reset does not remove the low battery indicator please double check that the voltage of your new battery is above 2 8 V this is the threshold for the indicator to turn on Master Reset If a meter ever becomes non responsive or experiences anomalies such as a low battery indicator even after replacing the old battery a master reset can be performed that ...

Page 15: ...rcuit board of the meter Care should be taken to remove the back panel of the meter in order to access the board and splice on the additional cable otherwise two splices would need to be made between the meter and sensor head See Apogee webpage for further details on how to extend sensor cable length http www apogeeinstruments com how to make a weatherproof cable splice ...

Page 16: ...r factory The warranty does not cover equipment that has been damaged due to the following conditions 1 Improper installation or abuse 2 Operation of the instrument outside of its specified operating range 3 Natural occurrences such as lightning fire etc 4 Unauthorized modification 5 Improper or unauthorized repair Please note that nominal accuracy drift is normal over time Routine recalibration o...

Page 17: ...anship Apogee Instruments will repair or replace the items free of charge If it is determined that your product is not covered under warranty you will be informed and given an estimated repair replacement cost PRODUCTS BEYOND THE WARRANTY PERIOD For issues with sensors beyond the warranty period please contact Apogee at techsupport apogeeinstruments com to discuss repair or replacement options OTH...

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