Operating Instructions
Contents
1. 2 sunken sockets are located opposite the first side at the rear into which the LED lamp housing can be plugged Plug in the lamp housing so that the light shines on the black aluminium plate Polarity reversal protection is also provided here Fig 6 Fig 6 Connections for plug in LED illumination CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 7 von 14 ae CONATEX Operating Instructions DIDACTIC BAE_ 1009040 Continuous Fog Chamber Note Never confuse the LED illumination sockets with those for the power supply This would lead to destruction of the fixed voltage controller in the fog chamber 4 side A water connection for 510 mm non pressure rubber or plastic hoses found everywhere in schools in chemistry labs is located at the front left Fig 7 One side is connected to the water supply the other acts as the water drain Cold water only forms a water channel with a maximum of 2 litres min The water temperature is decisive not the volume Fig 7 Connection for cooling water circuit Plug the lamp housing into the socket intended for this purpose Fig 6 Connect the cooling water and turn it on Allow the water to run for a longer period of time if necessary until it is cold enough CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 62. CONATEX Operating Instructions DIDACTIC BAE_ 1009040 Continuous Fog Chamber reached by this plate depends on the water temperature The water temperature should be below 20 C if ionisation tracks are to become visible optimum results are achieved at water temperatures between 14 C and 18 C Surface temperatures of up to 34 C are achieved here on the cold side of the Peltier element The water temperature can be checked with a submersible thermometer inserted laterally into the heat exchanger Tracks of radioactive particles are observed within the Plexiglas receptacle Its internal diameter and height both 100 mm facilitate a comfortable lateral view of the black cooling plate against which the ionisation tracks appear in contrast Note The fog chamber should be mounted on a stable pedestal using the stand holder supplied The pedestal is not included in the scope of delivery Ensure that hoses for water cooling and power supply cables are laid so that pupils do not catch themselves when passing the test structure Illumination and cooling The special high performance LED illumination is plugged in from the side and also supplied with power via the power supply unit supplying the cooling element The Plexiglas receptacle fits exactly on the aluminium plate and rests on the base plate It has a 5 mm hole in the lower lateral area that should be aligned with the 4 mm hole in the side of the aluminium cooling pla
3. Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 4 von 14 oY CONATEX Operating Instructions DPtenDaA GC TFTt amp BAE_ 1009040 Continuous Fog Chamber A suitable 226 Ra specimen CL09018 radiation rod can be screwed into the base plate from below with its radiation aperture aligned with the centre of the chamber on the upper surface of the plate Fig 3 Fig 3 Insertion of radiation rod in the fog chamber After fitting the lid and applying 12 15V operating voltage tracks of radioactive particles from the specimen can be observed in the receptacle after approximately 5 minutes if the cold water flow is adequate and a cooling plate temperature of below 30 C is achieved The procedure can be observed for as long as the felt pad in the lid contains alcohol The extreme temperature drop from high to low causes the aluminium plate to act as a cryogenic pump and the felt pad dries out Repeated soaking with alcohol continues the procedure Commissioning of continuous fog chamber The following equipment is required and the following preparations should be made 1 Controlled power supply unit 0 15 V 0 10 A A simple variable transformer with power rectification is inadequate The fog chamber can also be operated with a 12 Volt car battery 2 Cold water connection with approx 2 litres minute flow The water
4. is A current should flow on the power supply unit when the voltage is slowing increased Further error diagnosis Connect a DC ammeter to the main current circuit A current of several Ampere should flow when the voltage is increased 2 LED illumination is not working Examine as in Item 1 Is the lamp housing plugged correctly into the respective socket at the rear of the base plate Light emission occurs above via the aluminium cooling plates Further error diagnosis Turn the base plate around so that the rear is at the front The sunken sockets face you and is to the right Measure the lamp voltage with a DC voltmeter It should be 5 Volts Fig 6 Further error diagnosis Connect 5 Volts to the disconnected lamp housing is to the left and the light should be shining at you now 3 The signal LED triggers after some time No or too little cooling water A temperature safety and current ceases to flow Fig 4 switch is integrated in the base plate that triggers at 65 C Either wait one hour until the temperature has dropped below 35 C again or assist the process by introducing a flow of cold water Measure the water temperature at front It should be less than 20 C CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 13 von 14 amp
5. 2 CONATEX Operating Instructions BAE_ 1009040 Continuous Fog Chamber 4 No fog tracks are formed Several possible causes a No radioactive specimen Ensure that a radioactive specimen is present in the chamber Check with a Geiger counter if necessary whether the specimen really emits radiation b Temperature is not low enough The temperature of the aluminium plate should be 32 C This is achieved with a water temperature of less than 20 C and a Peltier current of approx 8 Amps Further tests as in Item 1 c Too little or no isopropanol Check the felt pad in the lid It should be damp to well soaked with alcohol Purified ethanol can also be used instead of isopropanol An indication of commencing operation is diffusive fog formation prior to fog tracks forming d Soap residue effectively prevents the formation of a supersaturated zone Switch off the fog chamber and allow it to warm up Clean the receptacle and lid without the felt pad using lukewarm water Dry and wash out the felt pad do not use soap subsequently drying it again The anodised aluminium plate is particularly adept at gathering stubborn dirt Plug the gap between the aluminium plate and base plate rinse the aluminium several times with lukewarm water then dry it and subsequently clean with alcohol CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 68
6. 21 94 11 0 www conatex com email didactic conatex com Seite 14 von 14
7. 5 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 8 von 14 a gt CONATEX Operating Instructions DPtenD aA GC Ft C amp C BAE_ 1009040 Continuous Fog Chamber Insert a radioactive specimen into the chamber interior by unscrewing the little knurled protective cap The CL 09018 radiation rod can be screwed into the aluminium cooling plate from the underside of the base plate directing its emission towards the centre of the plate Other specimens e g incandescent mantels radioactive rock old clock faces are simply placed on the edge of the aluminium cooling plate Fig 8 Fog chamber prepared with radioactive specimen Position the receptacle on the base plate so that the lateral hole in the receptacle is aligned with the lateral hole in the aluminium plate Both holes are on side 1 of the base plate i e facing towards the observer Insert a temperature measuring instrument through both holes if necessary Soak the felt pad in the lid with approx 5 ccm ethanol or preferably isopropanol Fig 2 and mount it on top so that the felt pad is inside the chamber The felt pad should contain just enough alcohol so that no drops are visible The fog chamber is now ready for operation Switch on the power supply unit and adjust the power supply slowly to the setpoint value of 15 Volts Approximately 8 Amps flow The LE
8. D lamp functions from approximately 7 Volts onwards and projects a beam of white light over the aluminium cooling plate The observer looks into this light Observation of ionisation tracks in the continuous fog chamber A thermometer inserted in the aluminium cooling plate now indicates a rapid fall in plate temperature A diffuse fog forms over the floor of the chamber from 10 C onwards indicating that the felt pad in the lid is soaked with alcohol that is now condensing over the plate A further temperature drop to 34 C leads to atmospheric super saturation after 5 10 minutes and the first fog tracks become visible They emanate from the specimen indicating the presence of radiation CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 9 von 14 ae CONATEX Operating Instructions DIDACTIC BAE_ 1009040 Continuous Fog Chamber The chamber is soon filled with fog tracks A ring shaped moisture precipitate appears on the receptacle exterior This is harmless and dispersed to a great extent by the blower integrated in the LED lamp Fog tracks can be seen as long as the felt pad in the lid contains enough alcohol This lasts for approx 1 hour where 5ml of isopropanol is involved Tricks Fog tracks can become ill defined and blurred as a result of ex
9. a CONATEX Operating Instructions Dito A CC Ft C amp C BAE_ 1009040 Continuous Fog Chamber Continuous Fog Chamber Order No 1009040 Fig a ray emitted from an Fig a ray emitted from an Ra 226 specimen incandescent mantel or environmental radiation Physical principle a B and yrays e g as emitted by 226 Ra can as a result of their ionising effect be detected in a fog chamber The particles possess considerable energy several MeV after the decay of 226 Ra and this enables it to ionise gas molecules through collision If a super saturated environment of isopropanol or ethanol is provided the ions created through particle bombardment form condensation particles that in turn contribute to the formation of fog A fog track forms along the trail of the radioactive particles similar to the condensation trails that form behind by a jet flying in the stratosphere Steam super saturation can be achieved by engineering a temperature drop from high to low in a receptacle filled with alcohol steam CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 1 von 14 amp CONATEX Operating Instructions BAE_ 1009040 Continuous Fog Chamber The upper receptacle area is generally at room temperature Super saturation does not yet occur here The lower receptacle zone is coole
10. cated on the side edges of the base plate 1 side Red signal LED and hole for measuring the water temperature This side should be turned towards the observer Fig 4 Fig 4 Signal LED overheating protection and hole for temperature measurement Note The power supply should be interrupted if the LED illuminates The thermostatic switch activates again when the warm side of the Peltier element has cooled to approx 36 C CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 6 von 14 IU CONATEX Operating Instructions 2 side 3 side BAE_ 1009040 Continuous Fog Chamber The sockets for the operating voltage of 12 15 Volts are located to the right of the 1st side Polarity is red black The chamber has polarity reversal protection to prevent anything happening in the event of incorrect polarity Fig 5 The power supply unit is connected here Fig 5 Connections for supply voltage 12 15V 8A Note The plate in the receptacle can reach a temperature of up to minus 36 C cold during operation of the fog chamber Touching it can lead to freeze sticking One should therefore wait approx 5 minutes after disconnecting the operating voltage before cleaning the plate The plate can be heated quickly to room temperature with a hairdryer if necessary
11. cessive ions in the chamber Lightly rubbing the Plexiglas receptacle with a soft cloth or fleece helps here as the frictional electricity generated removes excess ions Moisture condensation and icing in the lower area of the receptacle can be removed with a warm air flow thus re establishing the former visual contrast Warning Substances that reduce the surface tension of liquids can seriously disturb the formation of fog tracks Any contact between the chamber and soapy solutions should therefore be avoided particularly during cleaning work CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 10 von 14 amp 2 CONATEX Operating Instructions BAE_ 1009040 Continuous Fog Chamber Decommissioning the continuous fog chamber gt The power supply unit and its output voltage is first reduced and subsequently deactivated The measuring leads are removed The cooling water supply is then turned off Remove the temperature sensor if present Remove the receptacle lid and deposit for drying VV V WV Remove the receptacle and dry with a soft absorbent cloth Note there should be no residual alcohol on the receptacle as it can otherwise develop micro cracks and become dulled gt Remove the LED illumination Remove the radioactive specimen store safely and s
12. crew in the cover cap from below if necessary gt Dry the aluminium plate Tip the plate can be heated to room temperature quickly with a hairdryer Note Please do not use a cloth soaked in water as the plate can be up to 34 C cold and the cloth can freeze stick to it immediately However in the event of this happening warm the plate up e g with a hairdryer and then remove any residual paper Do not use detergents or other agents that wet surfaces gt Remove the water hoses and blow out the water cooler CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 11 von 14 ae gt CONATEX Technical data Power supply Water cooling Illumination Steam formation Temperature measuring Operating temperature Operating duration Fusing Care Important Caution Operating Instructions BAE_ 1009040 Continuous Fog Chamber stabilised power supply unit 12 16 Volts DC 6 8 Amperes approx 2 litres min high performance plug in LED gap lighting room light dimmed a felt pad in lid soaked with 5 ml isopropanol or ethanol Water Plug in sensor in lateral heat exchanger opening Cool plate Plug in sensor in lateral heat receptacle and cooling plate opening Water 14 C 20 C Cooler 29 C 34 C Appro
13. d dramatically causing super saturation within the temperature fall range in which a radioactive particle can be detected by its fog track Further expansion is unnecessary as the procedure occurs continuously provided adequate alcohol is available Bright lateral illumination can make this procedure visible to a larger group of persons General description Receptacle High performance LED illumination Base plate with Peltier element and water cooling Lid with reservoir for isopropanol 75 90 Fig 1 Fog chamber components Scope of delivery v Base plate with Peltier element and heat exchanger v High performance LED illumination plug in unit with integrated blower v Plexiglas receptacle v Lid with reservoir for isopropanol v Support stand 12mm x 120mm not illustrated The CL09040 fog chamber is a compact construction on an aluminium base plate The plate is 125 x 125 mm with lateral plug in LED illumination It contains a heat exchanger operated with tap water approx 2 litres min that cools the warm side of a Peltier element The required operating temperature of 32 C on a carbonised aluminium cooling plate is generated on the cold side of the Peltier element The lowest temperature CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 2 von 14 ae
14. te A temperature sensor not included in the scope of delivery can be inserted through both holes should it prove necessary to determine the temperature of the cooling plate CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 3 von 14 amp 3 CONATEX Operating Instructions BAE_ 1009040 Continuous Fog Chamber Filling with isopropanol The underside of the receptacle lid contains a felt pad that is soaked with 5 ml isopropanol or ethanol Fig 2 Do not use pure isopropanol but rather 75 to 90 alcohol The percentage of water influences the effectiveness of condensation Too much water causes the base plate and or specimen to freeze rapidly Pure alcohol prevents reliable operation Fig 2 Application of isopropanol or ethanol to the felt in the receptacle lid Note Please ensure that no naked light or ignition sparks are in the immediate vicinity when handling isopropanol or ethanol Bunsen burners or hot plates should not be operated in the vicinity and smoking should also be forbidden Please note that alcohol fumes caused by residual isopropanol or ethanol on the felt pad in the lid can be present after the trial is completed Ensure that the room is well ventilated during and after the experiment CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539
15. temperature should not exceed 20 C Water pipes are usually very long in schools and lukewarm water generally emerges initially after a tap is turned on However the water will cool to the required temperature if it is allowed to run for some time 3 Prepare the classroom so it can be darkened if necessary CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 5 von 14 ae gt CONATEX Operating Instructions DIDACTIC BAE_ 1009040 Continuous Fog Chamber 4 Stand pedestal with a central hole of at least 12 mm 5 Radioactive specimen The CL 09018 radiation rod consisting of 226 radium is the easiest to handle with a completely harmless emission of 3 7 kBq The fog chamber is equipped with a screw fitting for receiving this radiation rod Any other preferred radioactive specimen can be deposited on the chamber floor e g incandescent thorium mantle or naturally radiating specimens such as radioactive rock etc lonisation tracks of natural environmental radioactivity can be made visible without a radioactive specimen approx 20 30 instances of decay every minute Screw the metal rod with the M6 x 10 thread into the threaded hole provided for this purpose on the underside of the fog chamber Position the chamber on a stable tripod The following components are lo
16. x 5 10 minutes waiting period after preparation and activation The procedure can be viewed for approx 1 hour before it is necessary to refill the alcohol The chamber is protected against polarity reversal and automatically deactivated at 65 C heat exchanger temperature when operated without cooling water reactivating at 35 C again bimetallic switch The base plate and cooler should be wiped with an absorbent cloth Polish the receptacle with Plexiglas polish after use if necessary The fog chamber interior plate and receptacle should be kept free of grease and soap and cleaned with a degreasing agent if necessary Do not use detergent The receptacle should not be exposed to alcohol for a longer period of time after use as micro cracks will otherwise develop in the Plexiglas CONATEX DIDACTIC Lehrmittel GmbH Rombachstr 65 D 66539 Neunkirchen Customer service freecall 00800 0266 2839 D CH A L or 0049 0 6821 94 11 0 www conatex com email didactic conatex com Seite 12 von 14 amp 2 CONATEX Operating Instructions BAE_ 1009040 Continuous Fog Chamber In the event of malfunction Error Symptom Possible cause and remedy l Nothing happens after the chamber is Incorrect power supply unit or incorrectly activated despite waiting for a long period connected Does the power supply unit provide 16 Volts at min 8 Amps Polarity reversal protection is provided Check polarity red is black
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