wtw OxiTop IS 12, Operating Manual

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Cleaning / Battery replacement Information / Technical data
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Cleaning
Cleaning of sample bottles

Do not use disinfectants!
(Disinfectants will kill the required microorganisms!)

Remove gross contaminations mechanically, e.g. with a brush .

Rinse the bottles with clear water or with water of the next sample .
(After using detergents rinse thoroughly! Detergent residues may disturb the BOD
5
determination!)
Cleaning of the OxiTop

Single Measuring System

Do not use alcohol or acetone!

Clean with a soft cloth and aqueous soap solution
Battery replacement (approx. every 3 years)
- Push in spring catch.
- Open upper lid.
- Remove batteries.
- Put in new batteries, pay attention to polarity!
(e.g. WTW-Modell Batt/Oxitop

, Order No. 209 012).
- Place upper lid with tap on locking pin (lower lid). Attention! Do not squeeze cable
connection.
- Close upper lid (make the hook click).
Disposal note:
Please dispose of the lithium batteries at a battery collection point.
Information
Never use sealing grease or other lubricants for your OxiTop

instruments. Some of these products contain solvents which cause
severe damages on the plastic housings.
The tightness of the BOD bottles is completely sufficient without grease.
Rough contaminations and particles on the contact surfaces of the
rubber quiver annd the OxiTop

must always be wiped off.
WTW grants no guarantee for damages caused by sealing grease.
Labelling :
To label the bottles clearly, WTW offers a marking set (6 marking rings with
numbers, which can be put on the neck of the bottle):
Model
MARK-6 (6 pcs)
Order No. 209 013.
Check of the measuring system:
On request WTW offer special test instruments for test control.
Further literature:
WTW BOD handbook
DIN 38409T51
DIN 38409T52
Technical data OxiTop

single measuring system
Measuring principle Respirometric (manometric)
Display 2-digit 7-segment LED, 10 mm
Measured parameter Digits
Measuring range 0 ... 40 digits (+10 digits for overranging)
Admissible measuring
temperature 20°C
±
1 K
Admissible sample
temperature
(when being filled)
15-20°C
Power supply Lithium batteries (260 mAh), 2 x type CR 2430 (3V)
Power consumption Max. 25 mA (during measurement)
Protection class
Protection system 3 IEC 1010
IP 54 IEC 529
EMC Emissions
Immunity
EN 50081-1, FCC Class A
EN 50082-2, NAMUR recommendation
Climate class
Ambient temperature
2, VDI/VDE 3540
Storage:
-25°C ... +65°C
Operation: +20°C
±
1K
Test mark CE
Dimensions
Weight H: 69 mm, diameter 70 mm
Approx. 85 g