wtw OxiTop Control OC 110, Operating Manual

Page: 45 / 102

OxiTop
®
Control OC 110 Operating mode: Pressure p
ba31116e05 07/2014
45
7 Operating mode: Pressure p
Switch to the Pressure p operating mode: see section 9.4.1 O
PERATING
MODE
, page 60.
7.1 Hazards during the determination of biogas
CAUTION
The pressure sensor in the measuring head may be destroyed by
a pressure of 2000 hPa or higher.
CAUTION
During the anaerobic degradation of organic material in sealed
equipment, high pressure can develop due to biogas (main
components: methane and carbon dioxide).
The following hazards can occur:

Risk of bursting due to the high pressure and risk of injury
caused by flying glass splinters.

Risk of explosion due to development of flammable gas
mixtures if high concentrations of methane escape.
Take the following precautionary measures for safe operation:

Only use WTW measurement bottles of the MF/... series,
which are especially designed for biogas determination
(see WTW catalog).

Only use measurement bottles that are not damaged (e.g.
are not cracked, chipped or scratched).

Determine the reaction conditions (temperature, quantity)
under which no dangerous excess pressure develops by
means of monitored preliminary tests (e.g. with diluted ma-
terial).

For unmonitored measurements, include a buffer for the de-
veloping pressure, as the composition of biological materi-
al can considerably vary. Therefore, a pressure that is
higher than planned on can develop.

Only use the corrosion resistant OxiTop
®
-C/B measuring
heads. They were designed especially for biogas applica-
tions.

Please not that the OxiTop
®
measuring head displays a
pressure of up to 1350 hPa max.If the pressure is greater, -
1000 hPa is displayed.