Our conductive versions are available for all ATEX zones – even zone 0 is possible. The pump does not lose any of its technical features and can thus be used without limit in productions in which increased fire and explosion risks prevail. Our team will be happy to advise you, according to the area of application and requirements, in the selection of the right double diaphragm pump.
A contactless sensor (proximity sensor) is installed in the motor housing. This registers every second stroke of the diaphragm in the pump chamber. This type of stroke counting is independent from the operation mode of the pump. The signals from the sensor can, for example, be transmitted to an available control unit or an optionally available stroke counter. The strokes for the pump can be pre-defined via the stroke counter.
Once the preset stroke rate is reached, the pump is switched off using a likewise optionally available solenoid valve. The strokes can also be captured pneumatically using a pressure sensor. Here, the pressure change in the motor housing is measured behind a diaphragm.
Stroke counters are available in the following models:
SC 1 – Proximity sensor (Namur) with approx. 3.0 m connection cable
SC 2 – Proximity sensor (Namur) with stroke counter
SC 3 – Proximity sensor (Namur) with stroke counter and intrinsically safe isolating amplifier in accordance with potentially explosive areas
SC 5 – Pressure switch (1.0 – 10.0 bar) with approx. 5.0 m connection cable
SC 6 – Pressure switch (1.0 – 10.0 bar) with stroke counter
If the proximity sensor (SC 1) is used in a potentially explosive area, an intrinsically safe isolating
amplifier should also be provided.
The buffer chamber system with diaphragm monitoring is available in the following models:
BC 1 – Buffer chamber system with diaphragm monitoring, with sensors
BC 2 – Buffer chamber system with diaphragm monitoring, with sensors and switching device
BC 3 – Buffer chamber system with diaphragm monitoring, with sensors, switching device
and an intrinsically safe isolating amplifier (potentially explosive areas)
The maximum permissible operating temperature for pumps with buffer chamber system with diaphragm monitoring is +70 °C for PE pumps and +80 °C for PTFE pumps.
For pumps with side housing made from plastic (PE and PTFE, also electrically conductive), the backwash system allows for the removal of residues from pipes and pumps. A bypass line is introduced into the side housing for the pump. The bypass line is opened via manual valves. Care should be taken to ensure that the manual valve is turned by max. 10 mm since the lift on manual valves is not limited. The bypass line can also be opened using pneumatically operated valves.
For this, a valve control pressure of at least 3.0 bar is required. For pumps with side housing made from metal (aluminium, grey cast iron and stainless steel), the backwash system allows for the removal of residues from pipes and pumps. To do this, the ball valves in the pump chamber are manually lifted on the draw and pressure sides. The backwash system/ball valve raising can automatically be activated when the pump is switched off if an optionally available 4/2-way valve is used.
The backwash system/ball valve raising is available in the following models:
BF 1 – Backwash system with manual valve, EPDM seals for pump housings made from plastic and metal
BF 2 – Backwash system with manual valve, PTFE seals for pump housings made from plastic and metal
BF 3 – Backwash system with manual valve, FPM seals for pump housings made from plastic and metal
BF 4 – Backwash system with pneumatic valve, EPDM seals for pump housings made from plastic
BF 5 – Backwash system with pneumatic valve, PTFE seals for pump housings made from plastic
Dellmeco pumps can be used for the delivery of powders up to a bulk density of 800 kg/m3.
Thanks to the continuous blowing of compressed air into the diaphragm chambers, depositing of the powder is prevented. Shearing of the diaphragms while the pump is starting up owing to the powder residue found in the diaphragm chamber is thus prevented.
Dellmeco powder pumps are available in metal designs in all nominal sizes. The pumps are therefore predominantly suitable for the delivery of ground limestone, talc, coal dust, soot, quartz dust or silicone. This variant of the double diaphragm pump is even used in the food and pharmaceuticals industries. Among other things, it can be used to deliver sugar and cocoa powder, or even ground rubber or silicon oxide – as well as a wide variety of pharmaceutical base materials. Properties:
- No manual delivers of powder required.
- No contamination of the powder possible through manual delivery.
- The powder can be directly dosed.
- Easy system setup.
- Easy to transport pump.