VACUUBRAND MZ 2C EX +IK+EK - Manual (Page 25)

page 25 of 75
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. manual-no.: 999128 / 29/04/2014
☞ To control the faultless function of the diaphragm it could be recommendable to
install a gas specific detector at the outlet of the inert gas purge. A signal from
the detector indicates a diaphragm crack. Switch off the pump immediately and
check diaphragms.
☞ If the surrounding of the pump is not an explosive atmosphere it is possible to
leave out the inert gas purge.
Connection of the inert gas gas ballast
☞
Connect the inert gas connections at the gas ballast and the crankcase not serial
but parallel.
☞ Use only inert gas at the gas ballast connection. Therefore replace the blind cap
at the gas ballast connection by the hose nozzle enclosed.
☞ Gas ballast connection lines (inlet and outlet) have to be performed conductive
grounded and gas tight (designation of the pump connections see figures).
☞ Provide an external pressure limitation to a pressure of 1.1 bar absolute if inert
gas is connected to the pump or at an air admittance valve. The inert gas has to
be dry and pure. Provide an appropriate control system to supervise the inert gas
flow which switches off the pump in case of failure (e. g. absence of inert gas) if
necessary.
Attention: Important notes regarding the use of gas ballast
☞
When using air rather than inert gas, risk of significant damage to equipment and/
or facilities, risk of personal injury or even loss of life exists due to the formation
of hazardous and/or explosive mixtures if air and pumped media react inside or
at the outlet of the pump.
Outlet of the pump
☞
Always connect an exhaust lines at the pump outlet (small flange or hose nozzle
10 mm). Perform the outlet line conductive grounded and gas tight (designation
of the pump connections see figures). Always connect the exhaust to a suitable
treatment plant (e. g. hood).
☞ Potential explosive mixtures at the outlet of the pump have to be drained appro-
priately, sucked off or diluted with inert gas not explosive mixtures.
☞ If there is a danger of deposits in the pump chamber (check inlet and outlet of the
pump) control the pump chamber regularly and clean if necessary.
☞ If there is a risk of ignition of gases or gas mixtures before or behind the pump the
user has to provide suitable safety devices against incoming of flames according
to EN 12874. The user must ensure the suitability concerning gas flow, chemical
resistance and safeness against clogging prior to use.
Overpressure safety valve at the outlet of the pump
☞
The overpressure safety valve at the outlet prevents reliable high pressures in the
system. Check overpressure safety valve regularly and replace if necessary.
☞ Attention: If the exhaust pipeline is blocked the pumped gases may escape into
the environment through the overpressure safety valve. If necessary take appro-
priate measures.
If pumping dangerous gases install a second completely independent exhaust
pipeline instead of the overpressure safety valve. If necessary assemble a hose
nozzle (thread G 1/4) instead of the overpressure safety valve to lead away the
gases or condensate through a second exhaust pipeline. Attention: Never com-
bine the exhaust pipelines, i. e. provide a separate line for each exhaust.
Attention: Deposits and condensate may lead to increased temperature and
to excess of the max. permitted temperatures! Increased temperatures possibly
may lead to ignition of flammable mixtures inside the pump.
Use inert gas gas ballast if necessary and check pump regularly for deposits.
Install a gas washing bottle, condenser, filter, separator, etc. at the inlet of the
pump if necessary.