Boxer Pumps

3MD Series

The 3MD series is the new compact version of the double headed 3K pump. Highest quality con-rod and motor bearings ensure lowest power consumption and, combined with slow speed, maximum operational life. This series additionally offers a unique detachable motor construction allowing contaminated heads to be economically exchanged.

The 3MD series is offered with 2 different motors: brushed DC and brushless DC.

› Flow rate to 2.5 l/min
› Robust / long life
› Detachable motor
› BLDC with speed control input and frequency  (RPM) output
› Single (3K) and Quad (3MQ) versions are also available

Gas versions of this series is available with 3K, 3KD and 3KQ.

Fixing brackets are included as standard.

Return to Miniature Diaphragm Pumps for Liquid range.

Brushed motor available in 12 and 24 V.

Technical Data

Free Flow 2.5 l/min
Max Pressure 2.0 bar
Max Vacuum -600 mbar
Free Flow (gas / dry) 3.7 l/min
Max suction Height (dry) 4.5 m H2O
Voltage Options 12 / 24 V DC
Power Consumption 8.4 to 15.5 W
Max Ambient Operating Temperature 50 °C
Max Media Temperature 100 °C
Elastomers Options EPDM / Nitrile
Other Wetted Parts PPS (polyphenylene sulphide)
Weight 420 g
The above data is for parallel head connection. Series connection should only be used if higher dry suction height is required.


Order Information

Part Number:     3232.129     12 V DC / EPDM      ⇒
Part Number:     3232.131     12 V DC / FKM        ⇒
Part Number:     3232.254     24 V DC / EPDM      ⇒
Part Number:     3232.258     24V DC / FKM         ⇒

Brushless (BLDC) motor available in 24 V. 

Technical Data

Free Flow 2.2 l/min
Max Pressure 2.0 bar
Max Vacuum -70%
Max Suction Height (dry) 2.5 m H2O
Voltage 24 V DC
Power Consumption 2.0 to 9.5 W
Speed Input 0.5* to 4.5 V (167* to 1500 rpm)
*not recommended to run below 400 rpm (1.2 V)
Frequency (RPM) Output 1 pulse per revolution
Lead Length 40 cm
Max Ambient Operating Temperature 50 °C
Max Media Temperature 100 °C
Elastomers Options EPDM / FKM/ Nitrile / Silicone
Other Wetted Parts PPS (polyphenylene sulphide)
Weight 385 g



Motor Information

This motor is supplied with 4 wires:

Red         + 24 V DC supply
Black       GND
Green*    0.5 to 4.5 V DC (or 5.0V PWM, min. 15kHz signal) speed control
              Not recommended to run below 1.2 V / 400 RPM
Yellow     Frequency (RPM) Output, 1 pulse (5.0 V)  per revolution with 50% on-time

* Green wire can be connected to +24 V supply (red wire) for full speed


Order Information

Part Number:     3232.660       24 V BLDC / EPDM     
Part Number:     3232.665       24 V BLDC / FKM       

All data is representative for initial selection purposes. It is the responsibility of the user to determine suitability for the intended use.

Boxer Pumps
Boxer GmbH · For gas & liquids · 20 Belsize Avenue · London NW3 4AU
Phone: +44 (0)20 7794 4080 · Fax: +44 (0)20 7431 1426 · ·