DME Diaphragm Dosing Pump

DME Diaphragm Dosing Pump

The fundamental difference between DME pumps is the type of electronically controlled motor used to drive them.

The DME’s brushless DC motor varies the discharge stroke speed. The extended discharge phase of the DME results in better, more even mixing, which can be turned down to 1/800 (DME 60 to DME 940) of its maximum capacity.

 

AR, B, AP

g/h

ml/h to l/h

psi

bar

60-10

0.0198 to 15.85

75 to 60

145

10

150-4

0.0495 to 39.63

187.5 to 150

58

4

375-10

0.13 to 99

468.75 to 375

145

10

940-4

0.31 to 248.3

1175 to 940

58

4

+/- 1% repeatability

 

The DME versions all offer a digital keypad and easy to use menu. Capacity is set by adjusting the desired flow rate in g/h, l/h, or ml/h. Also included are a priming button, calibration mode, electronic lock, and internal counters of strokes, operating hours, and times the pump has been powered on/off.

With all the features of the smaller DME’s, the large models offer a basic manually controlled pump (variant B) or the externally controlled version with standard alarm relay (variant AR). Fieldbus communication is available with variant AP (Profibus).

1Compact positive displacement diaphragm dosing pump, with integrated variable speed motor drive, in an IP 65 plastic enclosure.

The pump is designed for optimum user-friendliness, accuracy and reliability, and is equipped with a logical control panel with one-touch buttons and a multi-language backlight display.

For enhanced accuracy, the pump can be calibrated to the actual installation by means of a simple calibration function.

The turndown ratio is 1 to 800 with the same accuracy and uniform dosage with reduced pulsation throughout the entire capacity range.

The pump is also equipped with a maximum capacity function (100%) that allows it to work for a preset time at max capacity to facilitate priming or ordinary maintenace, without modifying the pump’s settings.

 

The liquid end is composed of:

  • Pump head
  • PTFE-coated diaphragm
  • Ball valves
  • Manual bleed valve

Possible operating modes:

  • Manual dosing with direct setting in gph, ml/hour, or l/hour
  • External pulse control from external controller or flow meter with direct setting in ml/pulse
  • External analog 4-20, 20-4, 0-20 and 20-0 mA control with possibility to adjust the pump capacity at
  • maximum signal.
  • Timer-based batch function (internal timer).
  • Pulse-based batch function (external pulse).

Other features:

  • Electronic lock to prevent unauthorized setting changes
  • Anti-cavitation function for high-viscosity, gassing liquids or long suction lines
  • Maximum capacity limitation
  • Counters for numbers of pump strokes, hours of operation, and power on/off.
  • 14 optional display languages
  • Level control with input for low level and empty tank signals
  • Alarm relay output
  • Overload protection to protect the pump against unauthorized access.