wtw OxiTop Control OC 110, Operating Manual

Page: 41 / 102

OxiTop
®
Control OC 110 Operating mode: BOD Special
ba31116e05 07/2014
41
6 Operating mode: BOD Special
To change to the operating mode BOD Special see section 9.4.1 O
PER
-
ATING MODE
, page 60.
6.1 Sample preparation
See application reports.
Screw the OxiTop
®
measuring heads onto the measuring vessels
and close them tightly.
NOTE
Never use joint grease or other lubricants for your OxiTop
®
measuring heads. Some of these products contain solvents that
can cause severe damage to the plastic housing of the measuring
head.
The sealing of the measuring vessels is perfectly adequate
without grease. However, you should always wipe off heavy
contamination and particles on the sealing surfaces of the rubber
sleeves and OxiTop
®
measuring heads. WTW accepts no liability
for damage due to the use of joint grease.
6.2 Starting the measurement
Before starting the measurement, set the temperature and air pressure
(see section 9 GLP/TOOLS, page 57).
In the BOD Special mode there are 6 variable parameters:
SELECT ACTION menu (com-
munication with the measuring
heads):
Preselected:
- Start sample .
Parameters Default setting Admissible setting range
Bottle volume 510 ml 50 to 9.999 ml
Filling volume 164 ml 10 ml to bottle volume minus 10 ml
Dilution 1 + 0 1 + 0 to 1 + 99
Measuring range
(BOD) 395 mg/l up to 400,000 mg/l
Temperature 20°C 5 °C to 40 °C
(setting: see section 9 GLP/TOOLS,
page 57)
Air pressure 954 hPa 500 hPa to 1100 hPa (setting: see
section 9 GLP/TOOLS, page 57)