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Products  |  Fluid Mechanics  |  Hydraulic Fluid Energy Machines  |  HM 284
HM 284 Series and Parallel Connected Pumps Show data sheet (pdf file) Print page
Technical Description

  In complex systems, pumps can be connected in series or in parallel. In serial operation the heads of the pumps are added and in parallel operation the flow rates (capacities) of the pumps are added. 

  The experimental unit provides the determination of the characteristic behavior for single operation and interaction of two pumps.

  HM 284 features a closed water circuit with a water tank and two centrifugal pumps with drive motors. The speed of one motor is variably adjustable by a frequency converter. The other pump is fitted with a motor with fixed speed, this pump can be added to the system. The impellers of both pumps are mounted in transparent housings and can be observed during operation.  Valves enable to easily switch change between single pump, series or parallel pump operation. The system behaviour is analyzed with the aid of a valve in the delivery pipe adjusting the flow resistance.

  The experimental unit is fitted with sensors for pressure and flow rate.

  The microprocessor-based measuring technique is well protected in the housing. All the advantages of software-supported experiments and evaluation are offered by the GUNT software and the microprocessor. The connection to a PC is made by USB.

  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

- operating behaviour of centrifugal pumps
  * single pump operation
  * series pump operation
  * parallel pump operation
- recording of pump curves
- determination of pump efficiencies

- recording of system characteristic


* Characteristic behaviour of pumps during single

  pump, series or parallel pump operation1
* Closed water circuit1
* GUNT software for data acquisition, visualisation

  and operation1

* Part of the GUNT Labline fluid energy machines

Alternative products
HM 150.16 -- Series and Parallel Connected Pumps
HM 283 -- Experiments with a Centrifugal Pump
HM 365.14 -- Series / Parallel Pumps Module

[1] investigation and operating behaviour of pumps in various operating modes

[2] single pump, series or parallel pump operation, configurable via valves

[3] closed water circuit contains centrifugal pumps with drive motor and a transparent water tank

[4] one pump with variable speed and one pump with fixed speed

[5] adjustment of flow resistance by a valve in the delivery pipe

[6] sensors for pressure on intake and delivery sides of the pumps and flow rate

[7] microprocessor-based measuring technique

[8] unit-specific GUNT software for data acquisition and operation via USB under Windows XP,  Windows Vista or Windows 7 


Technical Data

Centrifugal pumps with motors

- power consumption, both pumps: 650W

Pump with variable speed: 0...3.300min-1

- max. flow rate: 40L/min

- max. head: 10m

Pump with fixed speed: approx. 2.800min-1

- max. flow rate: 40L/min

- max. head: 10m

Water tank: approx. 15L


Measuring ranges

- pressure (intake side): -1...1bar

- pressure (delivery side): 2x 0...5bar

- flow rate: 10...140L/min


Dimensions and Weight
LxWxH: 670x600x670mm
Weight: approx. 62kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Scope of Delivery

1 experimental unit

1 GUNT software CD + USB cable
1 set of instructional material

Order Details

070.28400  HM 284  Series and Parallel

                                  Connected Pumps

© 2005 G.U.N.T. Gerätebau GmbH