Shown with short stack brushless D.C. motor

BTC - IIS Series

Single Body, Dual Head
Miniature Diaphragm Pump
and Compressor.English/Metric

General Specifications Series Parallel
Pressure Range*
0-28 psig/193 kPa
Vacuum Range* 0 - 25 in Hg/635 mmHg 0-20 in Hg/508 mmHg
Max. Unrestricted Flow 6.0 LPM 11 LPM
  * Extended pressure and vacuum capabilities available upon request.
BTC- IIS Single Body Dual Head Miniature Diaphragm Pumps and Compressors are a series of brush and brushless DC motor-driven pumps tailored to meet the specific performance requirements of your applications. These pumps are designed to handle both gases and liquids.
  • Proportional Flow Control: Three-wire motor available for external pulse width modulation.
  • Longevity: The BT-IIS Series pump sets the highest benchmark for service-free performance with our unique brushless DC motor design and advanced proprietary diaphragm elastomer.
  • Light Weight, Compact Size: The BTC-IIS Series pump design has a unique compact configuration allowing designers to minimize system weight and allotted space requirement for pumps and compressors.
  • Versatile Head Configuration: Each pump head can be configured to operate independently for a combination of pressure, vacuum and liquid applications. The heads can be configured in series or parallel to increase vacuum, pressure or flow performance.
  • Flexible Mounting Options:The BTC-IIS maximizes mounting flexibility by offering several ways to mount the pump, as well as four possible port orientations.
  • Contamination-Free: Hargraves takes the necessary steps in manufacturing to assure that our 100% oil-free pump and compressor designs maintain the purity of your system. Hargraves pumps and compressors are commonly used in FDA-approved systems.
  • Dynamically Balanced: The BTC-II Series pump design is uniquely balanced to minimize vibration and maximize life.

Above performance ranges illustrate overall performance for all BTC-IIS dual-headed pumps handling air. Performance will vary depending on barometric pressure and
media temperature. Consult the factory with your specific requirements. See the BTC Series data sheet for single head performance.

BTC-IIS Series

A. Brushless Dual Ball Bearings

B. Brush Dual Ball Bearings

  All available in
6, 12 or 24 VDC*

The operating current varies from 200 mA to 1400 mA depending on the motor type, voltage, flow and pressure requirements.

*Other voltages available upon request

Ports are barbed for 1/8" I.D. flexible tubing.

Head Configuration available in any one of four positions.

Mounting Holes are drilled to accommodate 6-20 self-tapping screws. Other option available upon request.



Humidity Position Media Noise Level

5º - 70º * C

0 - 95% RH Any Most gases
and liquids
As low as
45 dB
*Duty dependent. Consult factory for high temperature applications over 50º C.

Materials of construction are selected to meet OEM application-specific requirements.


Mounting hole options seen in views: G, F. Mounting option G standard.
For additional mounting options consult the factory. Motor size may vary based on specifcations.