BOD Oxygen Meter OxiDirect

Order no.: BSB OxiDirect
£ 1,761.00
£ 2,113.20
BSB OxiDirect
price ex. (VAT / delivery)
Delivery time: 1-2 working days

 

BOD meter to determine biochemical oxygen demand / direct collection of samples / precise and immediate display of the BOD values in mg/l / measurement interval selectable / data storage / comfortable handling / RS232 interface / eco- friendly 
The BOD meter OxiDirect is a device that is designed to determine the biochemical oxygen demand, called B.O.D. By means of the BOD meter the samples can be taken without further ado, and the BOD values are displayed in real-time speed, precisely in mg/l. Each BOD meter features, depending on the edition, six or twelve sample containers. The handling of the BOD meter is very comfortable and the measurement period is selectable for a period of 1 to 28 days. The amount of oxygen expended for the catabolism of organic substance in water samples is called the biochemical oxygen demand. By measuring the BOD, biodegradable substances in water can be determined as well. Therefore the BOD is an important factor to determine the effect of industrial waste and that from private household on the water quality in sewage treatment plants and their receiving waters. The BOD meter OxiDirect allows an exact and comfortable determination of the BOD, following the respirometric principle. Therefore the amount of oxygen that is already metabolized, can be calculated by recording the pressure reduction inside the sealed BOD meter. Due to the fact that the BOD value of the sample correlates with its pollution by organic substances, and by that the value might vary, the BOD meter is customized for the sample volumes listed below, depending on their measurement range. This  results in a total measurement range of 0 ... 4,000 mg/l. The BOD meter can be applied on sewage, for determining biological activity rates, on clarification plants, analytic laboratories, in research and development.

- 6 or 12 sample containers
- Simplified sample drawing
- Measuring period variable
- Immediate display of BOD level in mg/l
- RS232 interface
- Total measurement range of 0 ... 4,000 mg/l

General Technical Specifications of the BOD meter OxiDirect Tintometer
Measurement principlerespirometric, quicksilver-free, electronic pressure sensor
Measurement ranges (mg/l O2]0 ... 40, 0 ... 80, 0 ... 200, 0 ... 400, 0 ... 800, 
0 ...2000, 0 ... 4000
Accuracy0.5 % of final value from measurement range at 20°
ApplicationBOD5, BOD7, OECD 301 F...
DisplayBOD [mg/l], 4-digit, 7-segment LED
ParametersBOD measurement range, volume, period, time of measurement
Measurement interval eligible between 1 and 28 days
Autom. data storageup to 28 measurement values, depending on measurement interval
Memory interval- hourly (1day)
- every two hours (2 days)
- daily (3-28 days)
Automatic start- after tempering the samples
- can be turned-off
Power Supply3 alkaline batteries
Battery lifetime1 year, if common use of BOD5 meter (maximum of one read-out per day), early warning in case the battery is down
InterfaceRS232 for printer or computer connection
ClockReal-time clock
IP CodeIP54
Diameters375 x 195 x 230 mm (incl. mixing unit)
WeightDevice with bottles: approx. 3850 g
Completely incl. mixing unit: approx. 5750 g
Measurement range and sample volume
The BOD level of a sample depends on its pollution with organic substances and can be extremely variable. Thus the BOD meter can be configured to the sample volumes below, depending on the measurement range.
Measurement range BOD mg/lSample volume ml
0 ... 40428
0 ... 80360
0 ... 200244
0 ... 400157
0 ... 80094
0 ... 200056
0 ... 400021.7
Mechanism of BOD meter OxiDirect
During the BOD determination the bacteria inside the sample consume the resolved oxygen. That difference in oxygen of the water compartment is then replenished by the oxygen from the gas compartment of the sample container. The resulting carbon dioxide emerging from the metabolism inside the water compartment and given to the gas compartment enters a chemical reaction with the potassium hydrate solution inside the tubular of the BOD meter. By that it is withdrawn from the gas compartment of the sample container. The ultimate result is a decrease of pressure. That decrease of pressure is linear proportional to the BOD level and is measured by the BOD sensor. The BOD value is then immediately displayed in mg/l. 
The recorded BOD values can be displayed in mg/l anytime, without the need of any additional calculation. Thus e.g. a collection of data over a weekend can be evaluated in the following week without further ado. The measurement interval is eligible within 1 to 28 days. BOD measurements commonly cover a period of 5 days. Short-time measurements can be useful for the purpose of research. Measurements covering a period of time are e.g. demanded for OECD determinations. 

Delivery content of the BOD meter OxiDirect with 6 sensors
1 x BOD meter OxiDirect with 6 sensors and control unit with batteries
1 x inductive magnet stirrer with adapter, 
6 x sample containers
6 x tubulars
6 x stirring staffs
1 x piston to measure overrun 157 ml, 
1 x piston to measure overrun 428 ml, 
1 x bottle potassium hydrate solution 50 ml
1 x bottle nitrification inhibitor 50 ml
1 x instruction manual
Delivery content of the BOD meter OxiDirect with 12 sensors
1 x BOD meter OxiDirect with 12 sensors and control unit with batteries
1 x inductive magnet stirrer with adapter, 
12 x sample containers
12 x tubulars
12 x stirring staffs
1 x piston to measure overrun 157 ml, 
1 x piston to measure overrun 428 ml, 
1 x bottle potassium hydrate solution 50 ml
1 x bottle nitrification inhibitor 50 ml
1 x instruction manual
Optional Equipment of the BOD meter OxiDirect
ArticleRef. Number
BOD sensor2 44 44 30
BOD sample bottle (brown glass, 500 ml)41 86 44
BOD sample bottle (brown glass, 500 ml, set of 6 bottles)41 86 45
Connecting cable for computer (serial 9-pole)2 44 44 40
Inductive-stirring system (for 6 samples, 100-240 V / 50-60 Hz)2 44 44 52
Magnetic stirring staff41 86 37
Stirring staff remover41 86 38
Rubber tubular41 86 36
Chemicals: 
Potassium hydrate solution (45 %, 50 ml)2 41 86 34
Nitrification inhibitor (N-ATH, 50ml)2 41 86 42
Measurement piston (21.7 ml)41 86 64
Measurement piston (56 ml)41 86 55
Measurement piston (94 ml)41 86 56
Measurement piston (157 ml)41 86 57
Measurement piston (244 ml)41 86 58
Measurement piston (360 ml)41 86 59
Measurement piston (428 ml)41 86 60
Complete set of pistons41 86 54
Test set (BOD CM test tablet, box with 8 tablets)41 83 28
Incubator for continuous tempering of various objects