LaMotte 2020 Instruction Manual

Also see for 2020: CHEAT SHEET

Contents

LaMotte 2020 Instruction Manual Manual pdf 15 page image

CALIBRATIONSTANDARD SOLUTIONSThe 2020 has been pre-calibrated in the range of 0 to 1100 NTU with AMCOTMprimary standards manufactured by Advanced Polymer Systems, Inc. This allowsthe 2020 to be used for treated water, natural water or wastewater. Recalibrationof the 2020 by the user is not required. However, a procedure to standardize thecalibration should be performed to obtain the most accurate readings over anarrow range.Two AMCOTMstandards of 1.00 NTU and 10.0 NTU are supplied with the 2020.Standards of other values are available as accessories. The standards are asuspension of uniformly sized plastic “micro spheres” in ultra pure water, whichrequire no preparation and are stable for long periods of time. These standardswere manufactured specifically as a reference to calibrate the 2020. OnlyLaMotte specific AMCOTMstandards should be used with the 2020. Thesestandards are guaranteed to be accurate to within ±1%, if the followingprecautions are observed:u The standards will remain stable for up to 4 years prior to opening if storedbetween 10 and 40°C.u Once the seal of the bottle is broken, the stability of the standard is onlyguaranteed for 1 year if stored between 10 and 40°C.u Never pour any unused or used standard back into the primary standardbottle.u Do not open the bottle in a dusty or dirty environment. Dust andcontaminants from the air can ruin the quality of the standard solutions.u Before filling a tube with a standard, rinse the inside of the tube with a smallamount of standard.u Cap the standard bottle and the tube immediately after filling.With proper preparation techniques, freshly prepared Formazin standards shouldbe equivalent to the AMCOTMstandards and can be used for meter calibration. A4000 NTU Formazin Standard is available from LaMotte Company for use inpreparing calibration standards. (See “Optional Accessories,” pg. 6.) Correctprocedures and approved methods for the use of Formazin standards can be foundin the current edition of Standard Methods for Examination of Water andWastewater.15