Description Of Keys; Technical Data - Velp Scientifica BOD Manuel D'instructions

1. Introduction
BOD measurement with BOD Sensor is based on the respirometric method that provides a direct measurement of the
oxygen consumed by microorganisms from an air or oxygen-enriched environment in a closed atmosphere, at a constant
temperature (20 °C ± 0.5) and with a soft sample stirring.
2. Assembly and installation
Upon receipt and after having removed the packaging, please check the integrity of the instrument. The box includes:
• BOD Sensor
BOD Sensor is delivered with 2 lithium batteries installed: remove the insulating strip from the rear without opening it.
3. Operating controls
The display of the electronic measuring unit is normally turned off reducing he consumption of internal batteries. The touch
of a key activates the display which automatically is turned off after three seconds. The key activates different functions if
the unit is performing a measurement or if it is in memory code.

3.1 Description of keys

Out of a measuring cycle (before starting)
Key SET with display off
Key SET with display on
Key START with display off
Key START with display on
During a measuring cycle (after starting)
Key SET
Key START
Key START kept pressed
Memory mode (it is active during a measuring cycle and also after if Reset is not performed)
Key SET
Key START
If no values are stored, the display shows three points after a prolonged pressing of key START.
Reset
Keys SET+START kept pressed
Before starting a new measuring cycle, it is requested to reset the stored values.
3.2 Scale selection
Scale
0 ÷ 90 mg O
0 ÷ 250 mg O
0 ÷ 600 mg O
0 ÷ 999 mg O
0 ÷ 4000 mg O
In case of scale 4000, the display shows H for thousands and hundreds, L for tens and units. Ex: H24 L07, means 2407 mg O2/l
3.3 Alarms
--- The measured value overcomes the maximum value of the chosen scale.
bAt Battery replacement. The charge of batteries does not assure in this case the finishing of a complete cycle.
4. Maintenance
BOD Sensor warns about the required change of batteries when the unit is resetted and the charge is lower than a minimum
threshold. Using a coin lever in the rear part of BOD Sensor and open it. Batteries are removed using the fingers. Introduce
two fresh batteries at the same time paying attention to the polarity. Battery replacement deletes any stored value.

5. Technical data

Dimensions (WxHxD)
Measurement
Stored data
Precision
Scales
Electrical input with display on 15 mA max.
Protection degree
6. Accessories / Spare parts
A00000135 BOD Sensor Check
10000904 Alkali container
• Alkali holder
The scale is shown
The scale is changed
The scale is shown
The cycle of measurement is started
The scale is shown
The current measure is shown
The memory mode is entered
The stored value is shown
The order number of stored value is increased
Measurement cycle stopped, stored values deleted and the scale is shown
Volume of sample
/l
2
/l
2
/l
2
/l
2
/l
2
50x70x70 mm
Electronic pressure probe
5 BOD values at 24 hours
± 1 digit ( ±3.55 hPa) ± 1%
90, 250, 600, 999, 4000 ppm BOD
IP 54-EN 60529
400 ml
250 ml
150 ml
100 ml
25 ml
Weight
BOD values
Display
Operation range
Power supply
Electrical input with display off 7,5 µA
Admitted room temperature
A00000136 Control Test Tablets
3
• Instruction manual
(also after the 5-day period if Reset is not performed)
(also after the 5-day period if Reset is not performed)
The scale is related to the
expected BOD value.
The possibility of measuring
diluted samples extends the range.
80 g
Directly on display at any time
3 LED digits, 7 mm high
500 ÷ 1100 mbar (h Pa)
2 lithium batteries (250 mAh)
Storing –25  +65° C
Operation +5  +40°C
EN