The changes of the resistance are particularly significant on the palm of the hands and on the plant of the feet. Such resistance decreases during periods of emotional stress. Moreover, the surface of the skin shows an electrical potential, that can reach up to 50mV and that can equally be influenced by emotional states. At the passage of an electrical current, the skin shows a resistance that is normally within the 100 kOhm to 1 MOhm range.
Circuit blocks:
Typical circuit that is used in the monitoring of the Galvanic Skin Resistance
Variation of the resistance in direct current of the skin with relation to humidity
Recording of the changes of the Galvanic Resistance of the skin due to emotional or physical stimuli.
Heat Conduction And Convection allows basic experiments on both forms of heat transfer: heat conduction and convection. Heat conduction and convection are among the three basic forms of heat transfer and often occur together.
Features:
Effect of heat conduction and convection on heat transfer.
Stepping motor, 200 step/rev, max torque = 60 N· cm
No. 2 limit micro switches
Graduated disc, 0 360
Encoder (200 pulse/rev)
Gear motor 90/1 rev.
Electric supply box consisting of:
a) Ammeter for measuring the motor absorbing current
b) Diagram on front panel showing the circuit working
c) Bushings for measuring relevant signals
d) Piloting card for stepping motor with USB interface
Circuit for undersaturated solution with tank, 2 heat exchangers for heating and pump
Measurement and control of temperatures in stirred tank, tank for undersaturated solution and in crystallisation cell.
Bypass for oversaturated solution with crystallisation cell and 2 heat exchangers for cooling
Crystallisation from solutions in fluidised bed
Heating circuit with pump, tank, heater and thermostat
Stirred tank for preparation of a saturated solution
Removable and fillable crystallisation cell, pmma
Adjustment of flow rate in bypass using valves.
Unit mounted on an anodized aluminum structure with panels made of painted steel.
Motor:
Speed range: 0-600 rpm.
A transparent protective cover, made of plastic, provides protection against the rotating parts and enables different experiments to be observed.
Five different path radii: 25mm, 50mm, 75mm, 100mm, 125mm.
Four different rotating weights (made of stainless steel) of 55g., 80g., 105g. and 130g.
The motor speed is controlled through the electronic console and the value of the speed is visualized in the digital display
Force sensor, range: 0-25N, resolution: 0.1N.
This piston also has an in-built pressure relief valve. The oil from the relief valve returns to the pump reservoir connection by means of flexible pipe. The first piston is located axially; it extends beyond the end of the tube and is drilled to suit a pressure gauge and a high pressure flexible rubber hose connecting the hand operated pressure pump to the unit.
The thin cylinder unit and hand operated pump are mounted on a bench-top base plate.
A thin wall tube contains two pistons.
The cylinder unit which is resting on the four pins is supported on a frame and located axially by a fixed stop and an adjustable stop.
The second piston is free to move axially within the tube, but its travel out wards is limited by a plate and end-cap.
Maximum test pressure: 40 bar.
Technical data about the thin cylinder unit:
Reservoir Capacity: 75 cm3
Pre-set relief valve setting: 450psi approx.
Cylinder material: Aluminium alloy.
Recommended oil: Castor oil
Gauge Factor: 2.0
Pressure gauge (Manometer): 0-50 bar.
Strain gauges: Foil type.
A 16 channels computer interface unit and software are provided. Dial Indicator is replaced by Digital Indicator with output. The Deflection Of Curved Bars Computer Interface set has the same accessories.
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The three Spur Gear Lifting Machine supplied include a driver having 40 teeth, a driven wheel with 120 teeth and an intermediate gear of 40/120 teeth compound. The pulleys mounted to some of the gears can be used for either single or double purchase experiments. A vertical stand incorporates a back plate which carries a number of spur gears on shafts to enable single, double or three stage gear trains to be assembled.
The driver and driven wheels have integral pulleys around which cords are wrapped to act as 'EFFORT' and 'LOAD'. The lifting machine can be set-up as a two gear or three gear train. Cords, hangers and a set of weights are included to provide drive to the gear trains and to determine ratios, mechanical advantage and efficiency.
A Computerised Air Conditioning Cycle Training Bench for studying the thermodynamic properties of air as it passes through the various sections of an air conditioning system.
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The pipes are supported on frames and use hand screw clamps to connect the surge and hammer components. The equipment comprises two stainless steel pipes, which can be used either for surge tests or for hammer tests.
Experimental Capability:
Measurement of the velocity of sound through a fluid in a pipe
Recording of hammer pressure profiles using the digital scope supplied
Investigating the effects of pipe hammer caused by a fast closing valve.
Demonstration of water level oscillations in the surge shaft.
Demonstration of frictional head loss between reservoir and surge shaft.
Measuring the pressure profile of hammer
Demonstration of pipe surge.
Rigid Rear Axle Cutway complete with differential unit, axle shafts and rear drum brakes. A brake drum and a cylinder are sectioned. Carefully sectioned to show the operation of the differential unit where planetary gears, the ring gear and the pinion are clearly dispalyed.
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Training Objectives:
Measuring the mains voltage
Measuring the electricity delivered to the mains grid
Measuring the electricity produced by the solar panel and delivered/taken from the mains grid.
Changing the inclination of the solar panel
Changing the azimuth of the solar panel
Measuring the load current, voltage, power and energy
Setting the solar panel to the most irradiated position
Covering the solar panel with different materials
Calculating the inner resistance of the solar panel
Obtaining the solar panel current voltage curve
Obtaining the solar irradiation data
Obtaining the solar panel voltage irradiation curve
A bench mounted base supports a variety of Curved Bars Apparatus in the form of a ring, semi-circle or quadrant/davit. Loads are applied by specially designed weight hangers so that the specimen bends. The theoretical deflections of curved shapes are most easily found by applying strain energy ideas, such as Castigliano's first theorem. The shapes chosen in Curved Bars Apparatus provide a relatively easy introduction to the use of such techniques. Horizontal and vertical deflections are measured by dial gauges rigidly attached to the base and surrounding pillars. All specimens, weight hangers and a set of calibrated weights are supplied. The Curved Bars Apparatus can be readily changed and the position of the dial gauges relocated to measure the deflections of the new configuration.
Experimental Capabilities:
To compare with theoretical estimates using strain energy theories such as Castigliano's first theorem.
To experimentally determine the vertical and horizontal deflections of various Curved Bars whose cross sectional dimensions are small compared with the bar radius.
Intended use:
Applicable for molecular/PCR & sterile microbiological works. Various clinical laboratory usage conditions including; Sample/reagent preparation, incubation, centrifugation, vortex, cold storage.
Plasma collection for clinical laboratory tests. Intended for the purposes of molecular diagnostic testing.
Material: clear nonfragile PET plastic and leak-proof rubber cap
Plastic shielded rubber cap to protect personnel from direct contact with blood.
Blood collection vacuum tube.
Volume 6m,
Sterile
Standard color-coded cap.
Pen/Marker writable label space.
Capped, with needle-pierceable vacuum seal cap.
Additive; Inert plasma separation gel & K2 EDTA anticoagulant.
Vaccine storage capacity: 1.5 liters
With lid and shoulder strap with flapper.
Cold life 34 hours at 43°C without openings.
Supplied with 4 x 0.6 liter icepacks as a standard.
Weight fully loaded: 8 kg.
Vaccine storage capacity: 98 L
Volume category: >/= 60, <120L
Energy consumption, stable running (kWh/24 hours): 0.6
Equipment operating voltage and frequency.
220-240 Volt 50Hz /60Hz, or 100-127 Volt 50Hz /60Hz, 1ph.
Operating temperature: Min and Max rated ambient temperature: +5 °C and +43°C
UIFPF- Grade A
R600a, 55 grams
PQS Prequalified Intermittent Mains Powered Refrigerator for storage of vaccines at +2 ?C to+8?C.
Vaccine storage capacity: 58 L
Volume category: <60L
Solar radiation reference period of 3.5 kWh/m²/day and hot zone (+43°C) test temperatures.
Operating temperature: Min and Max rated ambient temperature: +10 °C and +43°C
UIFPF: Grade A
Refrigerant: R290a, 35 grams
PQS prequalified Solar direct drive combined refrigerator and freezer with no battery for storage of vaccines at +2?C to+8?C and freezing of ice packs in areas without any electricity, or where there is less than eight hours of reliable electricity over a typical day.
Suitable for use with HB pencil and eraser (made of natural or synthetic rubber); is washable in water; and sufficiently rigid for the student to be able to write with the slate.
Material: Colour white, matt finish (both sides), high impact polystyrene (HIPS) sheeting, thickness 2mm.
resting on the knee.
Slate (individual writing board for students), A4 size (210 x 297mm), white high impact polystyrene sheeting, thickness 2mm, with rounded corners. Silk screen printed on both sides in cyan blue.
Design and rulings: Silk screen printed in cyan blue on both sides.
Reverse side: 8mm lines.
Front side: 1cm squares.
Border: An 8mm border in cyan blue on all sides.
Medical gas flow meter (Thorpe tube design) to regulate and measure theflow rate of medical gas supplied to a patient, maximum flow rate 8 LPM,for medical oxygen.
Graduation shall have over 270 degrees of visibility.
Needle valve and body constructed of brass or aluminium.
Calibrated at 50-55 psi / 345-380 kPa / 3.4-3.8 bar inlet gauge pressure.
Inlet pressure (nominal) > 50 psi (345 kPa / 3.45 bar), peak inlet pressure at least 100 psi (690 kPa / 6.89 bar).
Pressure compensated design to give specified accuracy for whole range of input pressures
Built-in inlet filter.
Thorpe tube design flow meter using DISS input connector for panel /regulator mounting.
Can be cleaned with damp cloth and a disinfection solution.
Transparent, graduated (metric system) column, shatter resistant polymer certified for medical use.
Maximum flow rate when fully opened: 50 L/min.
Inlet and outlet connectors DISS style, other types of connectors available upon request
Adjustment knobs to have rough surface to prevent slipping.
