LaMotte 2020we Manual

LaMotte 2020we Manual Manual pdf 7 page image

OperationHumidity Range:0–90 % RH, non-condensingAuto Shut-off: 5, 10, 30 min, disabledWaterproof: IP67 with USB port plug in place.Power Source†: USB wall adapter, USB computer connection orLithium ion rechargeable battery 2200 mAH, 3.7VBattery: Charge Life: Approximately 380 tests with backlighton to 1000 tests with backlight off. (Signalaveraging disabled).Battery Life: Approximately 500 charges.ElectricalRatings:Provided on nameplate labelDimensions: (W x L x H) 8.84 x 19.05 x 6.35 cm; 3.5 x 7.5 x 2.2inchesWeight: 362 g, 13 oz (meter only)USB Interface mini B†CE Mark: The device complies to the product specifications for the LowVoltage Directive. STATISTICAL & TECHNICAL DEFINITIONS RELATEDTO PRODUCT SPECIFICATIONSMethod Detection Limit (MDL): “The method detection limit (MDL)is defi ned as the minimum concentration of a substance that canbe measured and reported with 99% confidence that the analyteconcentration is greater than zero and is determined from analysis ofa sample in a given matrix containing the analyte.”1 Note that, “As Dr.William Horwitz once stated, ‘In almost all cases when dealing witha limit of detection or limit of determination, the primary purpose ofdetermining that limit is to stay away from it.’”2Accuracy: Accuracy is the nearness of a measurement to the acceptedor true value.3 The accuracy can be expressed as a range, about thetrue value, in which a measurement occurs (i.e. ±0.5 ppm). It can alsobe expressed as the % recovery of a known amount of analyte in adetermination of the analyte (i.e. 103.5 %).Resolution: Resolution is the smallest discernible difference betweenany two measurements that can be made.4 For meters this is usuallyhow many decimal places are displayed. (i.e. 0.01). Note that theresolution many change with concentration or range. In some casesthe resolution may be less than the smallest interval, if it is possible tomake a reading that falls between calibration marks. A word of caution,that resolution has very little relationship to accuracy or precision. Theresolution will always be less than the accuracy or precision but it isnot a statistical measure of how well a method of analysis works. Theresolution can be very, very good and the accuracy and precision can7