Xylem WTW OxiTop-IDS, Руководство по эксплуатации, Страница: 20 / 36

Operation with OxiTop
®
-IDS measuring heads Multi 3630/3620 IDS
20
ba77045e01 09/2019
Risks during
determination of
biogas (OxiTop
®
-IDS
/B measuring head)
NOTE
The pressure sensor in the measuring head may be destroyed by a pres-
sure 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
®
-IDS /B measuring
heads. They were designed especially for biogas applica-
tions.
 OxiTop
®
-IDS /B measuring heads display measured values
in the range 500 ... 1500 hPa. OFL (measuring range ex-
ceeded) is displayed if the pressure is higher.
CAUTION
If an OxiTop
®
-IDS /B measuring head displays OFL (measuring
range exceeded) despite all precautionary measures, the actu-
al pressure can already be considerably higher than 1500 hPa.
Terminate the measurement immediately:
 Wear protective equipment (face shield, protective clothing,
gloves).
 Wrap the bottle in a thick towel.
 Vent the bottle.