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4. Operating conditions
4.1 Environmental conditions
The pumps with appropriate nameplates are suitable for
operation in potentially explosive atmospheres Zones IIB or IIC,
depending on the type of pump and its equipment.
Minimum/maximum ambient temperature T
amb.
• Minimum T
amb.
: -20 °C.
• Maximum T
amb.
: +40 °C.
The materials used for seals and lubricants must be resistant to
vapours, gases or dust generated in the atmosphere of the
operating area. This applies particularly to contact with solvent
vapours which can damage plastics or change the composition of
oil or gear lubricant, thereby affecting its efficiency/ability to
function.
4.2 Dosing medium
4.2.1 Permissible temperature
Permissible media temperature
* 90 °C with DMH
4.2.2 Permissible dosing media
The DMH 25x, DMH 28x and DMX 226 pumps are suitable for
liquid, non-abrasive and non-inflammable media.
The DMH 25x and DMH 28x pumps in the following configuration
can also be used for dosing combustible media:
• Explosion-proof design with appropriate designation on the
pump nameplate, see section 3.1 Identification, and
• stainless-steel dosing heads and valves, and
• stainless-steel design of the diaphragm leakage detection in
the explosion-proof design with evaluator.
5. Installation
5.1 Earthing
The plastic version of the diaphragm leakage detection does not
have a conductive connection to the pump and must be earthed
by the customer.
5.2 Overflow valve
DMH 25x and DMH 28x: If the DMH 25x or DMH 28x is the only
pressure source in the system, it is not necessary to install an
overflow valve in the discharge line.
5.3 Suction line
The pumps may only be used if, under the
prevailing operating conditions, their materials
and operating liquids are sufficiently resistant to
mechanical and/or chemical influences in order
not to jeopardise explosion protection.
For DMH 28x pumps, the permissible media
temperature deviates from the information in the
general installation and operating instructions.
Dosing head
material
Max. media temperature
p < 10 bar p < 10 bar p < 16 bar p < 16 bar
Min. [°C] Max. [°C] Min. [°C] Max. [°C]
PVC 040020
Stainless steel,
DIN 1.4571
-10 70 * -10 70 *
Stainless steel,
DIN 2.4610
-10 70 * -10 70 *
PP 0 40 - -
PVDF * -10 60 -10 20
* (< 9 bar: 70)
The operator is responsible for setting up the
system in accordance with the requirements of
Directive 99/92/EC, taking into account the
appropriate standards for its application.
The motor and accessories for the pumps, e.g.
the actuator, frequency converter and
metrology-based monitoring, must at minimum
meet the requirements of Directive 94/9/EC as
applicable to pumps. Accessories for the system
and pipeline must at minimum meet the
requirements of Directive 94/9/EC as applicable
to pumps.
An intrinsically safe installation must only be
made and checked by someone who is
"appropriately qualified".
Make sure you read the installation and operating
instructions supplied with the individual
electrical components.
Make sure you adhere to applicable national
regulations when installing the system.
All pumps and accessories for the installation
must be earthed.
DMX 226: An overflow valve must be installed in
the discharge line to prevent impermissibly high
pressure on the discharge side of the pump.
Impurities in the dosing medium may damage the
diaphragm or block the discharge side of the
dosing head.
Install a filter (aperture size 1.5 mm) in the
suction line to prevent the pressure increasing in
the event of a fault due to a blockage on the
discharge side and damage to the diaphragm.
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