Safety And Control Devices; Operation In An Explosive Atmosphere; Sound Pressure; Pumped Fluids - Homa TP 28 Original Instruction Manual

2.7. Safety and control devices

Our products are equipped with various safety and con-
trol devices. These include, for example suction strainers,
thermo sensors, sealed room monitor etc. These devices
must never be dismantled or disabled. Equipment such as
thermo sensors, float switches, etc. must be checked by
an electrician for proper functioning before start-up (see
the "Electrical Connection" data sheet). Please remem-
ber that certain equipment requires a decoder device or
relay to function properly, e.g. posistor and PT100 sensor.
This decoder can be obtained from the manufacturer or a
specialist electronics dealer.
Personnel must be informed of the installations used and
how they work.
Caution!
Never operate the machine if the safety and monitor-
ing devices have been removed or damage, or if they
do not work.

2.8. Operation in an explosive atmosphere

Products marked as explosion-proof are suitable for opera-
tion in an explosive atmosphere. The products must meet
certain guidelines for this type of use. Certain rules of con-
duct and guidelines must be adhered to by the operator as
well. Products that have been approved for operation in an
explosive atmosphere are marked as explosion-protected
"Ex". In addition, an "Ex" symbol must be included on
the type plate! When used in an explosive atmosphere,
the additional chapter entitled "Explosion protection
according to the ...standard" must be observed!

2.9. Sound pressure

Depending on the size and capacity (kW), the products
produce a sound pressure of approximately 60 dB (A)
and 110 dB (A). The actual sound pressure, however,
depends on several factors. These include, for example,
the installation type (wet, dry, transportable), fastening of
accessories (e.g. suspension unit) and pipeline, operating
site, immersion depth, etc. Once the product has been in-
stalled, we recommend that the operator make additional
measurements under all operating conditions.
Caution: Wear ear protectors!
In accordance with the laws in effect, guidelines,
standards and regulations, ear protection must be
worn if the sound pressure is greater than 85 dB (A)!
The operator is responsible for ensuring that this is
observed!

2.10. Pumped fluids

Each pumped fluid differs in regard to composition, cor-
rosiveness, abrasiveness, TS content and many other
aspects. Generally, our products can be used for many
applications. For more precise details, see chapter 3, the
machine data sheet and the order confirmation. It should
be remembered that if the density, viscosity or the general
composition change, this can also alter many parameters
of the product. Different materials and impeller shapes
are required for different pumped fluids. The more exact
your specifications on your order, the more exactly we can
modify our product to meet your requirements.
If the area of application and/or the pumped fluid change,
we will be happy to offer supportive advice. When switch-
ing the product into another pumped fluid, observe the
following points:
• Products which have been operated in sewage or
waste water must be thoroughly cleaned with pure
water or drinking water before use.
• Products which have pumped fluids which are haz-
ardous to health must always be decontaminated
before changing to a new fluid. Also clarify whether
the product may be used in a different pumped fluid.
• With products which have been operated with a
lubricant or cooling fluid (such as oil), this can escape
into the pumped fluid if the mechanical shaft seal is
defective.
Danger - explosive fluids!
It is absolutely prohibited to pump explosive liquids
(e.g. gasoline, kerosene, etc.). The products are not
designed for these liquids!

3. General description

3.1. Application

HOMA pumps convey domestic, municipal and industrial
waste water, feces and sludge, also with high solid and
fiber content, as well as drainage water of all kinds. The
pumps can be used in small residential buildings, industrial
buildings or large pumping stations and sewage treatment
plants.
For highly abrasive content, such as concrete-gravel and
sand in the medium, it is necessary to protect the impeller
and pump housing against excessive abrasion or to shorten
the maintenance interval.
Before the pumping of chemically aggressive liquids, the
resistance of the pump materials must be checked. The
pumps are available in high quality materials of all compo-
nents (Stainless steel, bronze).
Use in sip operation is not permitted. According to the
type of installation and motor cooling, the machine
must be submerged in pumped liquid at least up to
the top edge of the pump or motor housing. The mo-
tor housing must always be completely submersed for
wet installation without a water jacket.
The temperature of the conveyed medium may be up to
40 °C, or up to 60 °C for a short period. The maximum
density of the medium is 1040 kg/m³ and the pH may be
from 6 – 11 . However, the pH alone only serves as a
guideline. In any case, alongside the composition of the
medium, the durability of the pump must be requested
from the manufacturer. Depending on the composition, it
may be necessary to use special sealing materials.

3.2. Types of use

The motors are designed for continuous operation (S1),
maximum 15 starts per hour. The hydraulic is designed for
permanent operation, e.g. supply of industrial water.
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