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BOD System Oxi700 with 6 sensor heads 115V/230V

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Clarkson Price: This item has been replaced by 2444460

Clarkson Catalog Number: L2444406

Manufacturer: Lovibond

Supplier Catalog Number: L2444406

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BOD System Oxi700 with 6 sensor heads 115V/230V Orbeco L2444406

BOD System Oxi700 Orbeco L2444406 Accessories

Clarkson L2444406

BOD System Oxi700 with 6 sensor heads 115V/230V

Orbeco L2444406

Orbeco BOD System Oxi700

Orbeco BOD System Brochure

Orbeco BOD System Manual

Prices

Highlights

Direct Sample Selection
Automatic Storage of all values
Easy to use
Accurate and direct display of
BOD values in mg/L
Automatic start after temperature equalization
Mercury-free
Inductive stirring system with automatic
re-centering of stirring rods

Biochemical Oxygen Demand (BOD) is an expression for the quantity of oxygen required for biological degradation of organic matter in a waste water sample. BOD measurement is used as a basis for the detection of biologically degradable organic matter in water.The difference between BOD and chemical oxygen demand (COD) is that COD additionally registers biologically non-degradable organic matter.

BOD measurement is therefore an important measurement of the effects of domestic and industrial waste water on sewage plants and outflow points. Manometric, respirometric BOD measurement using the Oxi700 The Orbeco-Hellige sensor system is a 6 sample system that allows precise measurements of BOD based on the manometric principle.

Manometric respirometers relate oxygen uptake to the change in pressure caused by oxygen consumption while maintaining a constant volume. The integral pressure sensors, make it unnecessary to use mercury for pressure measurements.

How it Works

Respirometric methods provide direct measurements of the oxygen consumed by microorganisms from an air or oxygen-enriched environment in a closed vessel under conditions of constant temperature and agitation.Carbon dioxide produced metabolically by the bacteria is chemically bound by the potassium hydroxide solution contained in the seal cup in the bottle. The result is a pressure drop in the system, which is directly proportional to the BOD value and is measured by the Orbeco-Hellige BOD sensor. The BOD level is then displayed directly in mg/l.

The BOD values are stored in the sensor memory and can be viewed on the large-format display at any time without the need for time-consuming conversion using factors. This means that test series that end on a Sunday can be evaluated during the following week without any problem. The measurement period is userselectable between 1 and 28 days to suit the application.While short measurement periods are useful for scientific applications, standard BOD measurements typically extend over a period of 5 days – and manometric determination of OECD, for example, generally takes place over a period of 28 days.

Measuring ranges and sample volumes

The BOD level of a sample depends on the quantity of organic matter present, which can vary considerably. The Orbeco- Hellige Oxi700 is calibrated for the various sample volumes and the corresponding measuring ranges listed in the table below. The overall measuring range of the system is 0 – 4000 mg/l. For all measuring ranges, BOD is shown directly in mg/l.

Range mg/l BOD	Sample Volume ml
0 – 40	428
0 – 80	360
0 – 200	244
0 – 400	157
0 – 800	94
0 – 2000	56
0 – 4000	21.7

Temperature equalization

Temperature equalization is essential prior to biological testing, as temperature has a major effect on biological activity. BOD measurements, for example, are always performed in a thermostatically controlled cabinet at a temperature of 20°C.

Day	Display/Sensor
1. Day	150 mg/L
2. Day	220 mg/L
3. Day	240 mg/L
4. Day	250 mg/L
5. Day	260 mg/L

Evaluation of measurements

If the measuring period is set at 24 hours, the Orbeco-Hellige Oxi700 BOD measuring system records a measurement once every hour. With a measuring period of 48 hours, the unit measures and stores a BOD value once every 2 hours. If the measuring period is between 3 and 28 days, one value is measured and stored each day.

Current values and stored values may be called up at any time. The table/graph below illustrates an example of BOD5 evaluation. The development of BOD over a period of 5 days is easily seen.

zub_ox

Automatic start function

Variations in sample temperature prior to testing result in pressure variations within the measuring system during the temperature equalisation period in the thermostatically controlled cabinet (if BOD measurement is to take place at 20°C, for example). Such variations would normally cause errors during manometric measurement.

In order to prevent such errors, the Orbeco-Hellige Oxi700 BOD meter is equipped with an automatic start feature: measurement does not commence until the temperature in the samples is the same as that in the thermostatically controlled cabinet. This rules out the possibility of temperature (and hence pressure) fluctuations that are not related to the manometric measurement.

The complete OxiDirect measuring system

In addition to the BOD unit for measurement and storage of BOD levels, the Orbeco-Hellige Oxi700 BOD measuring system includes sample bottles, measuring sensors, non-wearing inductive stirring system, overflow measuring flasks for monitoring of sample volumes, nitrification inhibitor and potassium hydroxide as an absorbent.

Measuring principle:	Manometric; mercury-free; electronic pressure sensor
Ranges [mg/l O₂]:	0 – 40, 0 – 80, 0 – 200, 0 – 400, 0 – 800, 0 – 2000, 0 – 4000 mg/L
Accuracy*	0.5 % full scale at 20°C
Applications:	BOD₅, BOD₇, OECD 301 F …
Result display:	BOD [mg/L]; 4 – digits; 7 – segment LED
Measurement parameter display:	BOD, volume, duration, time of measuring
Measurement period:	User-selectable, between 1 and 28 days
Auto result storage:	Up to 28 results, depending on measurement period
Storage interval:	– hourly (1 day); – every 2 hours (2 days); – daily (3-28 days)
Automatic start function:	– After temperature equalisation of samples; – Can be switched off
Power supply:	3 alkaline-manganese batteries (”Baby”/ cells/size “C”)
Battery life:	1 year (normal use as BOD₅ meter (max. one reading a day); early warning before battery fails
Interface	RS232 for printer or PC connection
Clock:	Real-time clock
Protection class (sensor head):	IP 54 (sensor head)
Dimensions: (LxWxH)	375 x 195 x 230 mm including stirring unit
Housing:	ABS
Approval certificate:	CE

*No standard is available to check the accuracy of respirometric oxygen uptake measurement. Tests with a glucose-glutamic acid solution having a known theoretical BOD have shown that the variation is approximately 5% in the range of 50…100 mg/l BOD, and 3% for higher range. Minimum Response or sensitivity of respirometric systems is about 0.05 … 1 mg/l.

The Orbeco-Hellige microprocessorcontrolled inductive stirring system is non-wearing and maintenance-free. At regular intervals, the magnetic stirring rods are accelerated and slowed down again, taking them up to maximum speed and back down again. This ensures the centralization of the stirring rods. Stirring rods that move away from the centr of the bottle are re-centered quickly and reliably. The inductive actuation system guarantees maintenance-free operation.

Part number	Description
L2444406 *	Oxi700 BOD System (115 V / 230V, 50-60 Hz) Includes complete unit with 6 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 of potassium hydroxide solution (50 mL); 1 bottle nitrification inhibitor solution (50mL) and instructions
L2444410	As above, with 12 sensor heads
L194150	Set of Turbidity Standards : <0.1, 20, 200, 800 NTU
L194141	Formazin Stock Solution (4000 NTU) 100 mL
L2418634	Potassium Hydroxide Solution, 45%, 50mL
L2418642	Nitrification inhibitor (N-ATH), 50 mL
L2444411	ET607 Inductive Stirring System, 230 V
L2444415	ET607 Inductive Stirring System, 115 V
L2444430	Oxi 700 Sensor Head
L2444440	Oxi700 Cable for data transfer
L418328	Test set for Oxi700
L418636	Gasket
L418637	Magnetic Stirring Rod
L418644	BOD Sample Flask, Brown Glass, 500mL
L418645	BOD Sample Flask, Brown Glass, 500mL, Set of 6
L418654	Complete Set of Overflow Flasks
L418655	Overflow Flask, 56 mL
L418656	Overflow Flask, 94mL
L418657	Overflow Flask, 157 mL
L418658	Overflow Flask, 224 mL
L418659	Overflow Flask, 360 mL
L418660	Overflow Flask, 428 mL
L418664	Overflow Flask, 21.7 mL
L444413	Oxi700, Stirring Controller, 230 V
L444414	Oxi700, Stirring Controller, 115 V

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