Sigma S2Ba Betriebsanleitung PDF herunterladen (Seite 18)

7 Installation, hydraulic

WARNING!

EX pumps in areas at risk from explosion

– It is essential that metering pumps to be used in areas at

risk from explosion are fitted with an appropriate safety

relief valve on the outlet side of the metering pump (to

protect it from excessive heating up from overloading

and from impact sparks resulting from overloading trig‐

gered by the breakage of drive parts).

–

In the event of different temperature classes with the

various components, the possible uses of the complete

pump are based on the component with the lowest tem‐

perature class.

– Diaphragm pump with mechanically actuated diaphragm,

e.g. MTMa.., TZMa.., Sigmas S1Ba...., S2BaHM...,

S3Ba: no additional action is required, but in principle

use the design with Ex"i" diaphragm rupture indicator.

– Ensure that installations in areas at risk from explosion

are checked by a "recognisably qualified and skilled"

operative.

– Please observe the relevant national regulations and

guidelines during installation!

WARNING!

Danger of fire with flammable feed chemicals

– Combustible media may only be transported using stain‐

less steel dosing heads. In exceptional cases where this

is not possible, PTFE with carbon can be used, whereby

our TT_ versions are manufactured from this conducting

plastic. Here, the operator is urged to take special care

due to the low mechanical strength.

–

Only designs of metering pump with Ex"i" diaphragm

rupture indicators are permitted in principle to meter

flammable media.

– The following applies to all metering pumps for the

metering of combustible media:

During filling and draining of the liquid end, an expert

must ensure that feed chemical does not come into con‐

tact with oxygen.

WARNING!

Warning of feed chemical reactions to water

Feed chemicals that should not come into contact with water

may react to residual water in the liquid end that may origi‐

nate from works testing.

– Blow the liquid end dry with compressed air through the

suction connector.

–

Then flush the liquid end with a suitable medium through

the suction connector.

WARNING!

The following measures are an advantage when working with

highly aggressive or hazardous feed chemicals:

– Install a bleed valve with recirculation in the storage

tank.

–

Install an additional shut-off valve on the discharge or

suction ends.

Installation, hydraulic

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