General Catalogue

Tintometer ® -GroupEvaluation of measurementsIf the measuring period is set at 24 hours, theLovibond ® OxiDirect BOD measuring system recordsa measurement once every hour. With a measuringperiod of 48 hours, the unit measures and stores aBOD value once every 2 hours. If the measuring periodis between 3 and 28 days, one value is measuredand stored each day.Current values and stored values may be called upat any time. The table/graph below illustrates an exampleof BOD 5 evaluation. The development of BODover a period of 5 days is easily seen.DayDisplay1. Day 150 mg/l2. Day 220 mg/l3. Day 240 mg/l4. Day 250 mg/l5. Day 260 mg/l300250200150100500Start Beginn Day 1. Tag 1 Day 2. Tag 2 3. Day Tag 3 Day 4. Tag 4 Day 5. Tag 5BOD 5 DiagramBOD accessoriesAutomatic start functionVariations in sample temperature prior to testingresult in pressure variations within the measuringsystem during the temperature equalisation periodin the thermostatically controlled cabinet (if BODmeasurement is to take place at 20°C, for example).Such variations would normally cause errorsduring manometric measurement. In order toprevent such errors, the Lovibond ® OxiDirect BODmeter is equipped with an automatic start feature:measurement does not commence until the temperaturein the samples is the same as that in thethermostatically controlled cabinet. This rules outthe possibility of temperature (and hence pressure)fluctuations that are not related to the manometricmeasurement.The complete OxiDirectmeasuring systemIn addition to the BOD unit for measurement andstorage of BOD levels, the Lovibond ® OxiDirectBOD measuring system includes sample bottles,measuring sensors, non-wearing inductive stirringsystem, overflow measuring flasks for meteringof sample volumes, nitrification inhibitor andpotassium hydroxide as an absorbent.Delivery Content■ Lovibond ® OxiDirect, complete unit with6 sensor heads and control unit with batteries■ Inductive stirring unit with power supply■ 6 sample bottles■ 6 rubber gaskets■ 6 magnetic stirring rods■ 1 overflow flask, 157 ml■ 1 overflow flask, 428 ml■ 1 bottle, 50 ml potassium hydroxide solution■ 1 bottle, 50 ml nitrification inhibitor solution■ 1 instructionOrder code: 2 44 44 06■ Lovibond ® OxiDirect,as above but with 12 sensor headsOrder code: 2 44 44 10Technical dataMeas. principleManometric; mercury-free;electronic pressure sensorRanges 0 - 40, 0 - 80, 0 - 200,[mg/l O 2 ] 0 - 400, 0 - 800,0 - 2000, 0 - 4000 mg/lAccuracy* 0.5 % full scale at 20°CApplications BOD 5 , BOD 7 , OECD 301 F ...ResultdisplayMeasurementparameterdisplayMeasurementperiodAuto resultstorageStorageintervalAutomaticstart functionPowersupplyBOD [mg/l]; 4 - digits;7 - segment LEDBOD-range,volume, duration,time of measurementUser-selectable, between1 and 28 daysUp to 28 results, dependingon measurement period– hourly (1 day);– every 2 hours (2 days);– daily (3-28 days)– After temperatureequalisation of samples;– Can be switched off3 alkaline-manganesebatteries (“Baby” cells/size “C”)Battery life 1 year (normal use as BOD 5meter – max. one reading aday); early warning beforebattery failsInterfaceClockProtection classRS 232 for printeror PC connectionReal-time clockIP 54 (sensor head)Dimensions: 375 x 195 x 230 mm(L x W x H) including stirring unitWeightHousing3850 g, unit with bottles5750 g, complete with stirring unitABSApproval C E*No standard is available to check the accuracy ofrespirometric oxygen uptake measurement.Tests with a glucose-glutamic acid solution havinga known theoretical BOD have shown that thevariation is approximately 5% in the range of50…100 mg/l BOD, and 3% for higher range.Minimum Response or sensitivity of respirometricsystems is about 0.05 … 1 mg/l.106 Regularly updated information: www.lovibond.com General Catalogue November 2010