OxiTopPM

System check of OxiTop systems with calibration tablets for checking 6 measuring units (long term test of leakage testing and negative pressure)OXITOP BOD Instrumentation
Pressure sensors for BOD testing and measurements.

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BODInstrumentation Product Description

OxiTop IS 6, IS 12
Measurement using OxiTop? Biological Oxygen Demand (BOD) Instrumentation isbased on pressure measurement in a closed system: microorganisms in the sampleconsume the oxygen and form CO².ÿ This is absorbed by NaOH,creating a vacuum which can be read directly as a measured value in mg/l BOD.

The sample volume being tested regulates theamount of oxygen available for a complete BOD measurement.ÿ BOD measurementranges of up to 4,000 mg/l can be measured using different sample volumes.

The OxiTop? BOD instrumentation heads (green andyellow for differentiation of inflow/outflow) have an AutoTemp function: if thesample temperature is too cold, the start of BOD measurement is automaticallydelayed (by at least 1 hour) until a constant temperature has been reached.

Apart from the automatic storage of 5 measuredvalues (1 value per day), further measured BOD values can be read at all timesduring or after the period of 5 days, which permits the tracking of check valuesor measurements over longer periods.ÿ The OxiTop BOD Instrumentationmeasurement system also offers simple operation, improved controllability, andnon-toxicity.

OxiTop Control 6, Control 12
OxiTop? Control Biological Oxygen Demand (BOD) Instrumentation is an advancedversion of the successful OxiTop? BOD Instrumentation system that usessoftware-controlled functions and an infrared interface to communicate with ahandy controller, the OC 100.ÿ This BOD instrumentation system enables thesimultaneous and grouped start, management, storage and tracking of 100 BODmeasuring heads via the controller and allows them to be tracked on a largedisplay with graphic evaluation.ÿ BOD measurement data can be transferredto the PC for evaluation and documentation via the AK-540/B cable (order no.902842) and the communication program Achat OC (order no. 208990).

The Biological Oxygen Demand (BOD) data can becalled up at any time, even during sampling, thus enabling checking of thesamples for errors.ÿ The display of the progress curve allows immediatedetection of irregularities and interferences, such as having the BOD value settoo high for the volume used or undesired nitrification.ÿ BOD measurementcorrections can thus be made at an early stage.ÿ OxiTop? Control BODinstrumentation offers you simple operation, improved controllability,non-toxicity, and measuring ranges of up to 4,000 mg/l BOD.

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Biological Oxygen DemandMeasurements according to EN 1899-1 and EN 1899-2 and for self-checks
Biological oxygen demand (BOD) determination is still one of the most importantparameters in water resource management.ÿ BOD measurements can be used toevaluate the impact of biodegradable substances in waters and wastewater bymeasureing the quality of water and treatment results in wastewater.ÿ Inaddition, BOD instrumentation measurments are used in the planning and design ofwastewater treatment facilities.ÿ The OxiTop? BOD measurementinstrumentation system offers a unique, modular and mercury-free way to make BODmeasurements.ÿ It is not only suitable for BOD determination, but also formeasuring biodegradability and depletion.

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In routine use, BOD determination is used tocheck the wastewater in the inflow and discharge of wastewater treatment plants.ÿDepending on the measurement site and type of wastewater the BOD value can liebetween a few mg/l and several thousand mg/l.ÿ Several BOD testing methodsare available for carrying out the measurement.

Various systems for BOD determinationmethods
In ?dilution BOD? the oxygen content of a sample is measured with an oxygensensor before and after an incubation period of 5 days.ÿ The differencebetween the measurements is the BOD5 value; this is the official EPA BODmeasurement method.ÿ The Oxi 1970i Portable Dissolved Oxygen Meters can beused for dilution BOD measurments.

In ?BOD self-checks? with the respirometerthe reduction in oxygen causes a definite pressure difference which can bemeasured by a pressure sensor.ÿ This BOD measurement method is very easyand practical to carry out.

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Although both methods are very different, theBOD measurements correlate for discharge analysis in municipal wastewatertreatment facilities.ÿ Both BOD measurement methods require that thesamples to be kept at 68 øF (20 øC) for 5 days.ÿ WTW offers a temperaturecontrolled box for use with the Oxitop? BOD instrumentation system.

BODInstrumentation Specifications

OxiTop IS
Measuring principle: Respirometric (manometric)
Display: 2-digit 7-segment LED, 10 mm
Measured parameter: Digits
Measuring range: 0 to 40 digits (+10 digits for overranging)
Accuracy: + 0.03 psi (+ 2 hPa) or + 1 digit
Admissible measuring temperature: 68øF ñ 1.8øF (20øC ñ 1øC)
Admissible sample temperature (when being filled): 59-68øF (15-20øC)
Power supply: Lithium batteries (260 mAh), 2 x type CR 2430 (3V)
Power consumption: Max. 25 mA (during measurement)
Battery run time: ~ 3 years with normal use
Protection class: 3 IEC 1010
Protection system: IP 54 IEC 529
EMC
ÿÿÿÿÿEmissions: EN 50081-1, FCC Class A
ÿÿÿÿÿImmunity: EN 50082-2, NAMUR recommendation
Climate class: 2, VDI/VDE 3540
Ambient temperature:
ÿÿÿÿÿStorage: -13øF to +149øF (-25øC to +65øC)
ÿÿÿÿÿOperation: 68øF ñ 1.8 F (20øC ñ 1 C)
Test mark: CE
Dimensions: H: 2.7in, dia. 2.8in (69 mm, dia. 70 mm)
Weight: Approx. 3 oz. (85 g)

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OxiTop -C
Measuring principle: Respirometric (manometric)
Measured of: BOD_n (oxygen drift according to DIN 38409 T 52)
Pressure range: 7.25 to 19.5 psi (500 to 1350 hPa(mbar))
Accuracy: + 1% of measured value, + 7% of measuring range
Resolution: 0.015 psi (1 hPa)
Display: LED pilot lamps
Power supply: Lithium batteries (260 mAh), 2 x type CR 2430 (3V)
Battery run time: ~ 2 years with normal use
Protection class: 3 IEC 1010, EN61010 part 1
Protection type: IP 54 DIN 40050
Admissible measuring temperature: 68øF ñ 1.8 F (20øC ñ 1 C)
Admissible sample temperature (when being filled): 59-68øF (15-20øC)
EMC
ÿÿÿÿÿEmissions: EN 50081-1, FCC Class A
ÿÿÿÿÿImmunity: EN 50082-2
Climate class: 2, VDI/VDE 3540
Ambient temperature:
ÿÿÿÿÿStorage: -13øF to +149øF (-25øC to +65øC)
ÿÿÿÿÿOperation: 41øF to 122øF (5øC to +50øC)
Test mark: CE, UL, CUL(UL/CSA)
Dimensions: H: 2.8in, dia. 2.8in (70 mm, dia. 70 mm)
Weight: Approx. 3.4 oz. (95 g)

OC 100 BOD Instrumentation Controller
Data sets per measurement: 180 to 360 (depending on duration)
Measurement period: 0.5 hr to 99 days
Power supply: 3 AA batteries; alkaline 1.5V
Interface: IR (infrared); RS 232 for communications with PC
Ambient temperature:
ÿÿÿÿÿStorage: -13øF to +149øF (-25øC to +65øC)
ÿÿÿÿÿOperation: 41øF to 104øF (5øC to +40øC)
Dimensions (HxWxD): 1.7×3.9×7.9 in (45x100x200 mm)
Weight: Approx. 13.8 oz. (390 g)

BOD Instrumentation Magnetic Stirrer
Power supply:
ÿÿÿÿÿInput: 230 VAC (+10%/-15%) 50/60 Hz /24 VA
ÿÿÿÿÿOutput: 18 VAC / 1 A
Power consumption: 24 VA max.
Speed of the stirring rods: Program-controlled 180 to 450 min^-1
Instrument protection class: 3, IEC 1010, IP30
EMC
ÿÿÿÿÿEmissions: EN50081-1/FCC class A
ÿÿÿÿÿImmunity: EN50082-1, EN50082-2, Namur
Climate class: 2, VDI/VDE 3540
Ambient temperature:
ÿÿÿÿÿStorage: -13øF to +149øF (-25øC to +65øC)
ÿÿÿÿÿOperation: 41øF to +104øF (+5øC to +40øC)
Relative humidity:
ÿÿÿÿÿYearly mean: < 75 %
ÿÿÿÿÿ30 days/year: < 95 %
ÿÿÿÿÿRemaining days: < 85 %
Test mark: CE, UL, CSA
Dimensions (LxWxH):
ÿÿÿÿÿIS 6: 10.5×7.25×2.75 in (265x181x67 mm)
ÿÿÿÿÿIS 12: 13.75×10.5×2.75 in (350x266x67 mm)
Weight (inclusive line adaptor):
ÿÿÿÿÿIS 6: 3.5 lbs (1.6 kg)
ÿÿÿÿÿIS 12: 7 lbs (3.2 kg)

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BOD Instrumentation Thermostat Box
Temperature control: 68øF +0.9øF (20øC +0.5øC)
Ambient temperature:
ÿÿÿÿÿStorage: -13øF to +122øF (-25øC to +50øC)
ÿÿÿÿÿOperation: 50øF to 89.6øF (10øC to 32øC)
Power consumption: 200W
Dimensions (HxWxD): 14.76×16.73×23.62 in (375x425x600 mm)
Weight: Approx. 66.1 lbs. (30 kg)