3
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
•
Alkali holder
•
Instruction manual
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
The scale is shown
Key
SET
with display on
The scale is changed
Key
START
with display off
The scale is shown
Key
START
with display on
The cycle of measurement is started
During a measuring cycle
(after starting)
Key
SET
The scale is shown
Key
START
The current measure is shown
(also after the 5-day period if Reset is not performed)
Key
START
kept pressed
The memory mode is entered
(also after the 5-day period if Reset is not performed)
Memory mode
(it is active during a measuring cycle and also after if Reset is not performed)
Key
SET
The stored value is shown
Key
START
The order number of stored value is increased
If no values are stored, the display shows three points after a prolonged pressing of key START.
Reset
Keys
SET
+
START
kept pressed
Measurement cycle stopped, stored values deleted and the scale is shown
Before starting a new measuring cycle, it is requested to reset the stored values.
3.2 Scale selection
Scale
Volume of sample
The scale is related to the
expected BOD value.
The possibility of measuring
diluted samples extends the range.
A: 0 ÷ 999 mg O
2
/l
100 ml
B: 0 ÷ 600 mg O
2
/l
150 ml
C: 0 ÷ 250 mg O
2
/l
250 ml
D: 0 ÷ 90 mg O
2
/l
400 ml
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)
50x70x70 mm
Weight
80 g
Measurement
Electronic pressure probe
BOD values
Directly on display at any time
Stored data
5 BOD values at 24 hours
Display
3 LED digits, 7 mm high
Precision
± 1 digit (
±3.55 hPa) ± 1%
Operation range
500 ÷ 1100 mbar (h Pa)
Scales
90, 250, 600, 999 ppm BOD
Power supply
2 lithium batteries (250 mAh)
Electrical input with display on 15 mA max.
Electrical input with display off 7,5 µA
Protection degree
IP 54-EN 60529
Admitted room temperature
Storing
–25
+65° C
Ope5
+40°C
6. Accessories / Spare parts
A00000135
BOD Sensor Check
A00000136
Control Test Tablets
10000039
Battery BOD Sensor
10000904
Alkali container
EN
