Sci-tech Gear Pump Test Apparatus Model FM 085 features a closed circuit with a tank and a gear pump with variable speed via frequency converter. The pump gears are mounted in a transparent housing and can be observed during operation. Flow rate and head are adjusted via a needle valve and an overflow valve. Oil is used as the medium.
Gear pumps belong to the group of positive displacement pumps with a continuous flow. Two counter-rotating gears transport the medium from the intake side to the delivery side. The transported medium is between the housing and the tooth spaces. The pulsation-free flow increases linearly with speed. These pumps are particularly suitable for the generation of medium-high pressure at low flow rates. The experimental unit provides the basic experiments to get to know the operating behaviour and the most important characteristic variables of gear pumps. The experimental unit is fitted with sensors for pressure and temperature. The oval wheel meter is especially used for the accurate flow measurement of viscous liquids. Oval wheel meters operate on the positive displacement principle with two precise oval gear wheels.
The microprocessor-based measuring technique is well protected in the housing. All the advantages of software supported experiments and evaluation are offered by the 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.
 functioning and operating behavior of a gear pump
 closed oil circuit contains a gear pump with variable speed via frequency converter and a transparent tank
 transparent housing for observing the pump gears
 needle valve for adjusting the flow rate
 overflow valve for adjusting the head
 sensors for temperature and pressure on intake and delivery side of the pump
 oval wheel meter as flow sensor
 microprocessor-based measuring technique
 Optional unit-specific software for data acquisition and operation via USB under Windows Vista or Windows 7
Gear pump with speed-controlled drive
– power consumption: 370W
Gear Pump Test Apparatus
– nominal speed: 200…1000min-1
– max. flow rate: approx. 15cmÑ per revolution
– max. head: approx. 100m
Overflow valve: 0…5,5bar
– pressure (intake side): -1…1bar
– pressure (delivery side): 0…5bar
– flow rate: 0…25L/min
– temperature: 0…100°C
– principle of operation of a gear pump
– recording of pump characteristics
– relationship between head and speed
– effect of pressure limitation
– determination of efficiencies
– Mains power supply: 220-240V, 1Ph, 50Hz