BOD meter manual VELP

1. Introduction to system analysis BOD

BOD short for signature: Biochemical Oxygen Demand in water biochemical oxygen demand

The micro-organisms already available or caused people to put on in a sample of water containing organic substances susceptible to decomposition by microorganisms use oxygen to the chemical process and produce a volume of carbon dioxyt (CO₂) the equivalent.

If the development process in a closed system and CO2 is absorbed by a strong alkalis such as v «i s «da ( Sodium, Hydrated calcium turns, 20% CO2 absorption ) or KOH then can measure the inside pressure reduction process.

Velp Scientifica developed a device consistent with international safety standards no no mercury content that measured by the probes BOD-can be used together with stirring devices 6 place or 10 place ( System 6 hay system 10).

The BOD is tighten directly on top of each bottle: It is equipped with a pressure sensor control with microprocessor allows to record 5 BOD values measured in each time period in 24 now. BOD values can be displayed on screen at any time, as well as following 5 standard day (i.e. 21 day).

The BOD is powered by two Lithium batteries do not need to connect the small wires or water pipes would.

To the sample annealed in the temperature controls can use the heat thing after Cabinet:

• FOC 22E: At the same time be able to stir the two systems brewed System 6 or System 10, latest

the temperature under the program from 0 to 50^theC.

• FTC90E: Brewed only was a stirring System System 6 or System 10, set the temperature according to the

the program from 0 to 50^theC.

• FTC90: Only be brewed 1 stirring System System 6 or System 10 fixed temperature

20^theC.

For details, see the product line: BOD incubators

2. Description of equipment:

2.1. BOD meters: The stirring device of the BOD 6 There are 10 location only allow limited 6 bottle or 10 Chai. The two sides have mounted equipment handles allow easy put in or pick up the device out of the cabinets as well as heat thing put the sample bottle in position. Stir the n1k1 motor continuously stops without risk or affect heat measurements. Motion is transmitted by belts and pulleys to the cantilever.

2.2. BOD probe: Using BOD is one of the most modern techniques available today. Just text the probe directly into the receptacles.

The inner pressure transmitter controlled by microprocessor process was direct pressure value into the value of BOD, that it has been memorized automatically after every 24 now with a total of 5 the value in the period 5 standard day. This allows the measurement of BOD including over the weekend.

B.O.D values can also be read at any time by the display on the screen of the probes as well as later stages 5 day.

3. Check the device receives:

When the receiving device, After opening the package need to check the following parts:

• 01 stirring device type 6 or 10 location.
• 01 power connection cable
• 06 or 10 bottle of B.O.D
• 06 or 10 or
• 06 or 10 probes B.O.D
• 06 or 10 alkali adsorption packets placed under cover of the probes

4. Equipment installation

Check the grid voltage levels for stirring device match the voltage of the equipment regulations. Putting CO2 adsorption on alkali package under the CAP probes. screw top bottle into each B.O.D probes already contains the template. put the system into incubators and set the proper temperature.

5. Operating controls:

5.1. The system of BOD (Stirring machine parts)

Check that all the positions of the air stirred activity do not need electrical plug, put the jars containing the from position to stir and see if it has a non-rotating.

5.2. Probes B.O.D:

Insert Lithium into all the probes B.O.D. Remove the insulating Strip to sensor operation. To open pull the end of the strip the wires in the back of the device without open.

Usually the screen of the probes off to save battery power. When touching the automatic screen keys operation and after 3 seconds if not touch will turn off.

Active keys in different functions depending on the metering mode in machine or remember.

5.2.1. BOD meter manual

In addition to measuring cycle
(Before the start)
Press A when the display screen off-> scale using the most recent times show
Press A when the screen displays turn-> to change the measuring scale
Press B when the display screen off-> to the directive scales used most recently modified
Press B when the screen displays turn-> to start measurement.

During the measuring cycle
(After starting)
Press The A-> show scales are used
Press The B-> show current measurement
(After the time 5 standard day if not reset)

Press B and hold: on memory fad

(After the time 5 standard day if not reset)

Memory mode
(Started in a measuring cycle and then if not press reset )
Press The A-> the memory value is shown
Press The B-> The order number of the memory value is increased.

Reinstall
Vào reset by the time the press both keys A and B.
Before the start of a new measurement cycle requires reset to remove the old memory value.

5.2.2. Select scale
Thiết bị B.O.D điện tử cho phép chọn lựa thang đo nằm trong bốn thang đo với giá trị cực đại là: 90.0; 250; 600; 999 ppm of B.O.D
After reset:

• To show scale-> Press the A or B
• To change the scale-> Press A when the screen display is on measure.
  • Chu Measuring cycle

When launch probes the B.O.D 24 hours remember once probes when B.O.D value achieved. Measurement cycle started after choosing the ladder by Indo B keys When the screen is on.

• Start measuring-> Press B keys When the screen is on

During the measuring cycle can be shown at any scale.

• The selected scale indicator-> Press the A

During the measuring cycle can display measured values at any time.

• The directive allows the measurement of time-webpages> Press the B
  B.O.D electronic devices allow current measurement display after the interval 5 standard day (i.e. 21 day, of B.O.D) If not press reset.
  • Show the memory value

Electronic device programmed memory B.O.D 5 the value in the distance the way 24 hours since launch. When the value is set to launch in 000.

Can remember the Cup before value reset. Memory values can be viewed at any time.

To enter the memory button, Press and hold B until the screen shows the number of 1. background contrast with the first memory value (day one).

By press key B again again, the screen showing all the measurements made until that time. Press A to display the corresponding value. If you don't remember the value would, the display will show three points after the press B for longer.

• To the memory-fad> Press and hold B
• Specifying the order of the values has to remember-> Press the B
• Specifying the corresponding measuring values-> Press the A
• Clock alert:

If the value measured is greater than the maximum value of the selected measuring scale, display 3 flashing point. Need to replace the batteries for the device when trờn the screen show the word "bat" flashes when start the cycle. The battery charger is not guaranteed to work to the end of a cycle.

6. Start the measuring cycle
7. Pouring on the bottle of sample amounts according to the selected scale, volume was swung by our guys tube
8. Take the stick from the bottle
9. For full on holders of alkaline substances, quantities of each bottle of Carbon adsorption dioxyt (Potassium hydroxyt or Soda) .
10. Put the bottle in position on the stir from
11. Put both thing put in heat cabinets stirred into the temperature selected for measurement of B.O.D. electrical plug.
12. Heat in the model and equipment will reach the usual selection of temperature from 30-40 minutes. Latest probes B.O.D on each bottle and screw block. Reset the values on each probes B.O.D, erasing the memory data and set the parameters back and start measuring.
13. End activity
    • If the device does not use long, you should remove the B.O.D to probe liquid did not affect holders refrain from.
    • The method of washing the bottles have been described in the maintenance section
14. Maintenance
    • After each cycle of the measurement of B.O.D bottles, the from and reviews of alkaline wash should be kept with hot water and use a small bottle table. Do not use bleach because the value of its high B.O.D can falsify the measurement. Cr2SO4 not be used because of its toxicity to microorganism.
    • When replacing the fuse: Unplug the power cord, Open the cover behind the stir equipment, instead of using the reserve fuse.
    • Probes B.O.D warning requires replacing Lithium when Reset probes. Use a coin and open it in the back of the probe. Remove the battery by hand and insert two new batteries into the. Note the polarity of the battery is indicated on the air. When replacing the battery, the memory data will be deleted off.

9. Technical norms

Sensor BOD:

Size: 50 x 70 x 70 mm

The weight: 85g

Measuring method: electronic pressure transducer

The value of BOD: Directly on the screen at all times

Save data: 5 BOD value in the range 24 now

Show: 3 LED digit

The precision: ± 1 digit (D±3.55 hPa) ± 1%

Active strips: 500 mbar – 1100 mbar (h Pa)

Measuring scale: 90, 250, 600, 999 ppm OFFER

Power supply: 2 cell lithium (250 mA/h) CR2430 type

Electrical input signal when turned on the screen: 15 mA max

Electrical signals on the medium: < 10 mA

The temperature in the room: use: +5^theC – +40^theC; storage: -25^theC- 65 ^theC

The system of BOD 6 and BOD 10:

Parameters	The system of BOD 6	The system of BOD 10
Place a stir	6	10
Size (mm)	350 x 300 x 150	432 x 300 x 165
The weight (kg)	2,3	3
The voltage	230V/50 Hz or 115V/ 60 Hz
Capacity	2In
Stirring speed	60 RPM
The temperature in the room	use: +5theC – +40theC; storage: -25theC – 65 theC