Test unit
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The latest version of a multipurpose test unit produced by Power (UK) Ltd, measures the speed in rpm of any revolving surface in addition to indicating hydraulic flow, pressure and temperature. All these functions are combined in a 10in. unit which the technician can take anywhere in the factory, or out on site, to make a thorough analysis of hydraulic system trouble. It can also be used in post assembly performance checks and similar tasks.
The unit can be inserted at any point in a hydraulic circuit and will give simultaneous direct gauge readings, flow, temperature and pressure. By turning a control knob to operate a loading valve in the tester, the operator can build up from zero to full working pressure and observe the behaviour of flow and temperature at various pressure levels.
In contrast to the principle embodied in a conventional flowmeter, which depends on measuring the pressure drop across an orifice, flow measurement in the Tektro unit is achieved by an electronic count of the rotation speed of a small turbine: therefore flow readings are not distorted by changes in temperature and viscosity of the hydraulic fluid.
The counting principle and electronic circuitry used for flow measurement have now been adapted to allow the unit to measure rpm. Previously it was not possible to distinguish between loss of pump speed and the other possible causes of diminished flow.
There is a selection of five flow ranges, the highest of which goes up to 125 indicated. gal/min. All units can be supplied with working pressure capability from 0-5,000 psi. Temperature readings cover the scale 50deg F/350deg F and speed measurements range up to 10,000 rpm, depending on the range of the flowmeter and gal/ min gauge.
The largest of the portab units, with a flow capacity of 12 indicated gal/min, measurE 1012-in. by 7in. by 71in. an weighs 20Ib. At the other er of the scale, the 20 gal/min un weighs 14klb.
Made by: Applied Power (U1 Ltd., Greycaine Road, Watfon Herts.