BOD meter OxiDirect
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 bilogical activity rates, on clarification plants, analytic laboratories, in research and development. If there are any questions about this BOD meter OxiDirect , please have a look at the technical specification below or call: UK customers +44(0) 23 809 870 30 / US customers +1-410-387-7703.. Our engineers and technicians will gladly advise you regarding the oxygen meters or any other products in terms of regulation and control, or scales and balances of PCE Instruments.

- 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

Measurement principle

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/l

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

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 replanished 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

Delivery content of BOD meter OxiDirect

Optional equipment for BOD meter Oxidirect

Optional Equipment of the BOD meter OxiDirect

Article

Ref. Number

BOD sensor

2 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 staff

41 86 37

Stirring staff remover

41 86 38

Rubber tubular

41 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 pistons

41 86 54

Test set (BOD CM test tablet, box with 8 tablets)

41 83 28

Incubator for continuous tempering of various objects

Applications
-BOD determination
- microbiological research
- Food industry
- Creamery
- Laboratories
- Research facilities
- Universities

- Display with background lights
- +2 ... +40 °C
- Settings in 0.1 °C steps
- 20 °C BOD determination
- 4 °C storage of sewage samples
- 25 °C enzyme activity (TTC test)
- 37 °C bacterial count

The unit for temperature regulation fulfills the EMC-directives according to IEC 61326: Electrical devices for measurement, monitoring and laboratorial use. 

Contact:
PCE Instruments UK Limited
Unit 11 Southpoint Business Park
Ensign Way, Southampton
United Kingdom, SO31 4RF
Phone: +44(0) 23 809 870 30
Fax: +44(0) 23 809 870 39

Contact:
PCE Americas Inc.
1201 Jupiter Park Drive, Suite 8
Jupiter 33458 FL
USA
Phone: +1-410-387-7703
Fax: +1-410-387-7714

Below you will find an overview of the different product groups of measuring instruments