3KD Series

The 3KD series is an extremely compact, robust and versatile double headed gas diaphragm 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 ecconomically exchanged.

This series is offered with a quality brushed and versatile brushless motor.

› Flow rate to 18.0 l/min
› Robust / long life
› Single and Quad versions available.

Single and Quad versions are available in the 3K and 3KQ series as well as liquid version with the 3K, 3MD and 3MQ series.

Fixing brackets are included as standard.

Flow control is available in combination with PWM Flow Controller.

Return to Miniature Diaphragm Pumps for Air and Gas range.

Quality brushed motor available in 12 and 24 V

Technical Data

Parallel Connection:
Free Flow	18.0 l/min
Max Pressure	2.0 bar
Max Vacuum	-800 mbar
Power Consumption	8.5 to 22.0 W

Series Connection (Vacuum only):
Free Flow	11.0 l/min
Max Vacuum	-900 mbar
Power Consumption	8.5 to 10 W

Voltage Options	12 / 24 V DC

Max Ambient Operating Temperature	50 °C
Max Media Temperature	100 °C

Elastomers Options	EPDM / Nitrile
Other Wetted Parts	PPS (polyphenylene sulphide)
Weight	435 g

Order Information

Part Number: 3112.129 12 V DC / EPDM ⇒ BOX-it
Part Number: 3112.254 24 V DC / EPDM ⇒ BOX-it

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

Brushless DC motor in 24 V DC with integrated driver.

Long life combined with elegant speed (flow) control via a 0 to 5V DC input, rpm feedback
output and a 5 V DC output is for convenient speed control via external potentiometer.

Technical Data

Parallel Connection:
Free Flow	15.0 l/min
Max Pressure	2.0 bar
Max Vacuum	-700 mbar
Power Consumption	8.5 to 22.0 W

Series Connection (Vacuum Only):
Free Flow	10.0 l/min
Max Vacuum	-900 mbar
Power Consumption	8.5 to 10.0 W

Voltage Options	24 V DC

Motor Inputs / Outputs (further details in Motor Information below)
Speed Input	0 to 5 V (0 to 4000 rpm)
Frequency Output	1 pulse per revolution
Voltage Reference Output	5 V DC (for speed control via external potentiometer)

Lead Length	40 cm (exit position not defined)

Max Ambient Operating Temperature	50 °C
Max Media Temperature	100 °C

Elastomers Options	EPDM / Nitrile
Other Wetted Parts	PPS (polyphenylene sulphide)
Weight	385 g

Motor Information

This motor is supplied with 5 wires:

Red         + 24 V DC Supply
Black       GND
Green     0 to 5V DC (or PWM, min. 15kHz signal) Speed Control
White     +5 V DC Output for use with 10 kΩ potentiometer and GND wire
Yellow     Frequency Ouput, 1 pulse per revolution with 50% on-time

Speed control is availabe with 3 options (see diagram on right).

The white wire (5V DC Output) is supplied with the lead end insulated. Damage will occur to the driver electronics if this wire is connected to +24 V or GND.