wtw 208210, Instruction Manual

Page: 27 / 44

Instruction manual
27
Operation of the Single Measuring System
OxiTop

 

Measuring principle
BOD measurement with the OxiTop

measuring system is based on pressure
measurement (difference measurement). The measuring is made by pressure
measurement via
piezoresistive electronic pressure sensors .
With the following functions, the OxiTop

measuring system minimizes the measuring
work and is especially suited to the courses of the respirometric BOD measurement:
•
• •
•
AUTO TEMP function:
Control of the temperature adjustment and automatic start of the measurement
(1 hour after starting the OxiTop

measuring system at the earliest, after 3 hours at
the latest). It is not necessary to temper the samples to exactly 20°C before starting
OxiTop

. Samples between 15°C and 20°C can be started immediately as BOD
measurement will not begin until a stable 20°C is reached. This is controlled by
the "AutoTemp" feature.
• • • •
Data logging
Automatic measurement with daily storage of measured value for 5 days:
facilitates measurement without supervising, e. g. over the weekend.
• • • •
Current value
Indication of measured value (0 - 40 digits) corresponds to the digits of the
previous WTW BOD instruments. Conversion of mbar to digits is stored in the
instrument, i. e. evaluation of the measured values remains unchanged.
• • • •
Measuring range reserve
from 40 to 50 digits - for overranging without reset by opening the bottle.