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Operations Manual YSI DO200
Portable Dissolved Oxygen and Temperature Instrument

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WARRANTY
The YSI DO200 Instrument is warranted for one year from date of purchase by the end user against defects in materials and workmanship. YSI DO200 probes and cables are warranted for one year from date of purchase by the end user againstdefects in material and workmanship. Within the warranty period, YSI will repair or replace, at its sole discretion, free of charge, any product that YSI determines to be covered by this warranty. To exercise this warranty, write or call your local YSI representative, or contact YSI Customer Service in Yellow Springs, Ohio. Send the product and proof of purchase, transportation prepaid, to theAuthorized 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 original warranty period, or at least 90 days from date of repair or replacement. Limitation of Warranty This Warranty does not apply to any YSI product damage or failure caused by: (i) failure toinstall, operate or use the product in accordance with YSI's written instructions; (ii) abuse or misuse of the product; (iii) failure to maintain the product in accordance with YSI's written instructions or standard industry procedure; (iv) any improper repairs to the product; (v) use by you of defective or improper components or parts in servicing or repairing the product; or (vi) modification ofthe product in any way not expressly authorized by YSI. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. YSI's LIABILITY UNDER THIS WARRANTY IS LIMITED TO REPAIR OR REPLACEMENT OF THE PRODUCT, AND THIS SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY DEFECTIVE PRODUCT COVERED BY THISWARRANTY. IN NO EVENT SHALL YSI BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY DEFECTIVE PRODUCT COVERED BY THIS WARRANTY.

CONTACT INFORMATION
YSI Environmental, Inc. • 1725 Brannum Lane • Yellow Springs OH, 45387 800-897-4151 • 937-767-7241 • Fax: 937-767-1058 Email: environmental@ysi.com • Website: www.ysi.com/environmental

CONTENTS GENERALINTRODUCTION........................................................................... 2 INITIAL INSPECTION ..................................................................................... 2 PRECAUTIONS .............................................................................................. 2 The Case.................................................................................................. 2 The Probe ................................................................................................. 2 PROBE PREPARATION ................................................................................. 3 BATTERY INSTALLATION ............................................................................. 3 THEKEYPAD.................................................................................................. 3 THE LCD DISPLAY......................................................................................... 4 OPERATIONAL PROCEDURES .................................................................... 4 MEASUREMENT MODES .............................................................................. 4 CALIBRATION SET-UP.................................................................................. 4 Requirements............................................................................................ 4 Procedure ................................................................................................. 5 PROBE MAINTENANCE................................................................................. 5 TROUBLESHOOTING...