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YSI  550A

 

Y S I

Environmental

 

Page  13 

 

SYMPTOM

 

POSSIBLE SOLUTION

 

7.  Secondary display reads 

"Ovr" or “Undr”. 

A.  Sample temperature is less than -5º C (23ºF) or more than 

+45

o

C (122

o

F).  Increase or decrease the sample temperature to 

bring within the allowable range. 

B.  Return system for service. 

8.  Main display reads “Err” and 

Secondary display reads 
“RO”, “RA”, or “AdC”. 

A.  Return system for service 

9.  Main display reads “Err” or 

burn” and 
Secondary display reads 
“EEP”  

A.  Return system for service 

 

CONTACT INFORMATION 

 
YSI offers a wide range of customer assistance and technical support functions to ensure that you have 
the information required to use our products.  Contact YSI if you need assistance or 

have questions 

regarding any YSI 

P

roduct.  Business hours are Monday through Friday, 8AM to 5PM ET.  

 

 

YSI Environmental Incorporated 
1725 Brannum Lane 
Yellow Springs, OH  45387 
Toll Free:  800-897-4151 

(US)

Phone:  

+1 

937 767-7241 

Fax: 

+1 

937 767-1058 

E-Mail:  

[email protected]

 

www.ysi.com

 
 

Summary of Contents for 550A

Page 1: ...Operations Manual YSI 550A Dissolved Oxygen Instrument...

Page 2: ......

Page 3: ...S OF THE YSI 550A 3 PRINCIPLES OF OPERATION 5 PREPARING THE PROBE 5 DISSOLVED OXYGEN CALIBRATION 6 SALINITY COMPENSATION CALIBRATION 7 PROBE OPERATION 8 PROBE ELECTRODE MAINTENANCE 9 ACCESSORIES REPLA...

Page 4: ......

Page 5: ...gle calibration regardless of which dissolved oxygen display is used and will calibrate in either mode Salinity compensation values can be changed at any time without performing a new calibration A de...

Page 6: ...to the Authorized Service Center selected by YSI Repair or replacement will be made and the product returned transportation prepaid Repaired or replaced products are warranted for the balance of the...

Page 7: ...and salinity calibration and Increases or decreases the value during calibrations and Mode Press at the same time to switch the temperature units between Fahrenheit F and Celsius C and Mode Press at t...

Page 8: ...the instrument by unscrewing the two screws 2 Remove the rubber stopper from the chamber by pulling the tail free of the small hole on the chamber 3 Re attached the rubber stopper to the storage chamb...

Page 9: ...causes the probe current to change proportionally PREPARING THE PROBE MEMBRANE CAP INSTALLATION The YSI 550A DO probe is shipped with a dry protective membrane Before using the instrument for the firs...

Page 10: ...mation can be obtained over the internet or from a local airport or weather station To convert from meters to feet divide by 0 3048 For best results Check calibration with each use and recalibrate as...

Page 11: ...ess and release both the UP ARROW and DOWN ARROW keys at the same time to enter the calibration menu 4 Press the Mode key until mg L is displayed on the right side of the screen for oxygen units Press...

Page 12: ...hrough the sample 3 Allow temperature and dissolved oxygen readings to stabilize 4 Observe Record readings 5 If possible rinse the probe with clean water after each use PRECAUTIONS 1 Membranes last lo...

Page 13: ...ne does not resolve the problem then proceed with the chemical cleaning Mechanical cleaning Sand off the dark layer from the silver anode with 400 grit wet dry sandpaper Wrap the wet sandpaper around...

Page 14: ...the hex screw was removed completely make sure that it is not cross threaded when replaced 7 The YSI 559 DO module is shipped with a dry protective membrane Before using for the first time remove the...

Page 15: ...module Dissolved Oxygen Response Time 95 of end value in 9 seconds Temperature Units Celsius or Fahrenheit user selectable Parameter Compensation Automatic temperature compensation for dissolved oxyge...

Page 16: ...Return system for service 4 Instrument readings are inaccurate A Verify calibration altitude and salinity settings are correct and recalibrate B Probe may not have been in 100 water saturated air duri...

Page 17: ...Main display reads Err or burn and Secondary display reads EEP A Return system for service CONTACT INFORMATION YSI offers a wide range of customer assistance and technical support functions to ensure...

Page 18: ...y from the receiver plug the YSI Instrument into a different outlet so that the computer and receiver are on different branch circuits If necessary the user should consult the dealer or an experienced...

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