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NovaLynx Corporation 
 

 

255-704-B 

Page 4 

April 2021 

 

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FORWARD

 

 

Thank you for purchasing NovaLynx products. NovaLynx has been designing and manufacturing 
weather instruments since 1988. NovaLynx represents several well-known brands of quality 
manufacturers, including Gill Instruments, RM Young, Kipp & Zonen, and Vaisala. It is our hope that our 
products will meet all your monitoring requirements. 

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INTRODUCTION 

 
The 

255-704-B Evaporation Logger

 is designed to record the output of an analog evaporation gauge 

(NovaLynx 255-100). The logger displays the current water level in the evaporation pan, along with 
logging status, battery status, and memory consumption. The logger stores up to 1.9 million 
measurements with 16-bit resolution.  
  
The logger is protected by a waterproof enclosure that is strapped to the outside of the evaporation 
gauge. The clear cover on the enclosure must be removed and a USB cable connected in order to read 
data out of the logger. The PC or Mac compatible software manages the logger and includes graphing 
and export functions. 

 

Optional air and water temperature sensors can be connected to the logger to record temperature 
readings along with the pan water level. The logger calculates minimum, maximum, average, and 
standard deviation statistics.  

 

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SPECIFICATIONS 

 

 

 

Summary of Contents for 255-704-B

Page 1: ...04 B UM 20210419 255 704 B User Manual 255 704 B Evaporation Logger 255 704 B Evaporation Logger with 255 100 Analog Output Evaporation Gauge Phone 530 823 7185 Email nova novalynx com Website www nov...

Page 2: ...items If packing facilities are not available take the equipment to the nearest Post Office UPS or other freight service and obtain assistance with the packaging Please write the RA on the outside of...

Page 3: ...tions 5 5 2 Float and Chain Installation 6 5 3 Software Installation 6 5 4 Logger Settings 8 5 5 Offset Calibration optional 11 5 6 Field Calibration optional 11 6 OPERATION 12 6 1 Start Logging 12 6...

Page 4: ...the current water level in the evaporation pan along with logging status battery status and memory consumption The logger stores up to 1 9 million measurements with 16 bit resolution The logger is pro...

Page 5: ...is straightforward The enclosure is fitted with a large band clamp which must be opened and passed around the body of the evaporation gauge photo Adjust the height so that the logger does not interfer...

Page 6: ...o clock position 30 degrees to left 3 Lift the chain until all the slack is taken up but the float is still resting on the bottom of the gauge Drape the chain over the sprocket so that the float is o...

Page 7: ...to the computer 4 Look at the status ribbon at the bottom of the HOBOware program window below At first the status will indicate No devices connected Within a minute the status should update and show...

Page 8: ...Logger has been pre programmed to read Channel 1 as water level in the evaporation pan The logger will be programmed either in inches or millimeters depending on the order specification The example be...

Page 9: ...ant window will open Please verify the settings on your logger NOTE The generic calibration shown above does not take into account the amount of water required to raise the float off the bottom of the...

Page 10: ...dow 11 Click the Device status icon to open the Status window below Note the battery level and memory used to ensure there is enough power and memory available for your next logging session 12 Set the...

Page 11: ...er s reading at that level 1 Measure the water depth and calculate the offset Example 8 00 Measured Depth 6 30 Logger Reading 1 7 Offset 2 Add the offset to the generic calibration values Value 1 Scal...

Page 12: ...ose the Status window 4 Open the Launch Logger window and navigate to the Linear Scaling Assistant window Section 5 4 Enter your measurements in place of the generic parameters 5 Click Update to save...

Page 13: ...file location and filename then click Save Once the file is saved the Plot Setup screen will open Select the elements you want to display in graphical and tabular form then click Plot LEFT Plot Setup...

Page 14: ...ust be deducted from the evaporation totals Water added by precipitation should also be deducted 7 MAINTENANCE At regular intervals inspect the following Check under the evaporation pan for leaks Insp...

Page 15: ...it back into place The two AAA 1 5V batteries should provide you with 7 to 9 months of continuous use Note A desiccant pack may be inside the logger box It can be replaced or retreated as needed 9 TEM...

Page 16: ...eight Drape the counterweight and chain over the outside of the gauge Do not attempt to remove the float 3 Rotate the sprocket by hand to verify that it turns freely 360 without binding It should spin...

Page 17: ...the sprocket may have slipped on the shaft and be out of position If the readings on the display are progressively worse the farther the sprocket is turned the potentiometer may be out of specificatio...

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