A simple and robust system for the measurement and recording of water wave profiles, which uses the principle of measuring the electrical conductivity between two parallel wires. Each probe consists of a pair of stainless steel wires which dip into the water waves. The electrical conductivity between them is measured, and is linearly related to their depth of immersion hence to wave height. The method is free of meniscus and `wetting effects.
The system is available in 1, 2 or 3 channel form and can display data by high speed recorder or input to a data logger. Alternative lengths of probe are 300mm or 500mm.
The probe consists of two 1.5mm diameter stainless steel wires spaced 12.5mm apart and 300mm long or 500mm long as required. Each probe is connected to its own wave monitor module in the electronic console by a twin core flexible cable 10m long. The distance between the console and probe may be increased up to 100m using commonly available low current cables.
Energization is conducted by means of an audio frequency drive signal which avoids all polarization effects at the wire interface. The signal is balanced relative to earth, to render the system immune to common mode voltages between the water and instrument earth. The frequency can be altered to permit two or more sensors to operate in close proximity without mutual interference.
The power supply module and appropriate number of wave monitor modules are mounted in a console, finished in matte textured blue paint and fitted with four rubber feet and carrying handle.
The result is a system giving high dynamic accuracy over a wide range of wave heights and frequencies.
An insulated gold electrode terminates 0.1mm from the tip of the rotating blades and detects the change in electrical impedance as each blade passes. The sensing head consists of a 5-bladed propeller that runs in jewelled bearings. As there is no physical contact between the electrode and blade, the propeller can rotate freely and respond to low velocity of the surrounding fluid. The propeller is able to rotate freely within a protective shrouded cage.
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Featured machined aluminum triangle that shows the orientation of the ports from outside the test Section and acts as a handle
Three ports
Mounts easily in the test section of an Educational Wind Tunnel
Length of 10.5 inches (26.7cm)
Outside diameter (O.D.) of 0.125 inches (3.175mm)
Comes with ample tubing.
The set-up also allows to take a closer look at the basic methods applied for determining the thermal conductivity of the surrounding soil of the geothermal probe. In near-surface geothermal energy generation the thermal energy stored under the Earths surface is used for heating purposes. The transparent experimental set-up provides an insight into the closed circuit of the heat transfer: it allows a clear view on the evaporation in the heat pipe, the condensation in the probe head and the reflux of the heat transfer medium on the inside wall of the heat pipe. It demonstrates the operation of a geothermal probe with heat pipe principle.
Learning objectives/experiments:
Determination of the amount of heat that can be dissipated in the heat pipe with variation of the thermal load
Determination of the sand's thermal conductivity by means of a thermal response test
Variation of the filling level of the heat transfer medium contained
Examination of the radial temperature profile in a sand sample and determination of the thermal conductivity
Fundamentals of geothermal energy
Operating behaviour of a geothermal probe with heat pipe principle
Fundamentals and energy balance of a heat pump.
Features a rounded-tip total-pressure tap
Reaches 2.6 inches (6.6cm) forward of the bend
Has an OD of 0.125 inches (3.175mm)
6 static ports
Extends 13 inches (33cm) to the bend
Comes with ample tubing.
Probe Sonicator and Homogenizers
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Material: Austenitic steel (non-quenched, non-magnetic steel).
Austenitic steel composition: 16-18% chromium, 8-14% nickel, 2-3% molybdenum.
To explore a surgical wound or to explore and/or dilate strictures inside a fistula.
Probe / dilator, straight.
Blunt bulbous shaped ends.
Diameter of the ends: approx. 2 mm.
Length: approx. 145 mm.
Reusable.
Operated: Static
Dimensions: 50 x 20 x 20(h) cm
Net Weight: 3 kg
Gross Weight: 6 kg
Equipment Layout: On Base.
