Operating Instructions LAUDA Compact Low—temperature
Contents
1. Kappe Calatte Cover Drehknopf Bouton rotatif Rotary knob Potentiometer Potentiom tre Potentiometer 1 kOhm Temperaturbegrenzer Limiteur de temp rature Temperature limiter Druck und R cklaufstrutzen Tubulures de refoulement et de retour Outflow Return tubes Temperatur Fihler Pt 100 Sonde de temp rature Pt 100 Temperature probe Pt 100 Perbunanschlauch Tuyau Perbunan Perbunan tubing 130 mm Perbunanschlauch Tuyau Perbunan Perbunan tubing 140 mm Klemme Pince Clamp Heizk rper Corps de chauffe Heater 220 240 V 50 60 Hz Pumpenunterteil kompl Partie inf rieure de la pompe compl Pump lower part compl H lse 1 Doui lle I Bushing I 9 mm Laufrad Saug kompl Roue de roulement aspriation compl Suction impeller compl Ausf hrung Mod le Model 50 Hz Ausf hrung Mod le Model 60 Hz H lse 1 Douille H Bushing II 5 mm Druckkammer kompl Chambre de pression compl Pressure chamber compl Ausf hrung Mod le Model 50 Hz Ausf hrung Mod le Model 60 Hz Kappe Calotte Cap Schalter Interrupteur Switch Netzschalter Interrupteur secteur Mains switch Motor Moteur Moter 220 240 V 50 60 Hz Ausf hrung Mod le Madel 50 Hz Ausf hrung Mod le Model 60 Hz Zugentlastung Protection pour c ble Cable tension relief Netzkabel mit Schukostecker C ble secteur avec fiche contact de protection Mains cable with earthed plug Leiterplatte A D Wandler Circuit Imprim A D Convertisseur Printed circuit board A D Converter Leiterplatte2. Operating Instructions LAUDA Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 to DIN 12 879 YACE0001 From series D 50 05 89 LAUDA DR R WOBSER GMBH amp CO KG Postfach 1251 D 97912 Lauda K6nigshofen Tel 093 43 503 0 Fax 0 93 43 50 32 22 E mail info lauda de Internet http Avww lauda de _Compact K ltethermostate Reihe RMS _ Thermostats compacts de r frig ration S rie RMS Compact Low Temperature Thermostats Series RMS Festtemperaturen Temp ratures fixes Fixed temperatures Justierpotentiometer Potentiom tre d ajustage Balancing potentiometer Temperatureinstellung LCD Anzeige Ajustage de temp rature Indication LCD Temperature adjustment LCD Display Entsperren D blocage Release ist Sollwert Taster Touche Valleur r elle Valeur de consigne Key Actual value Set point Pumpenstutzen Tubulures de pompe Kontrolleuchte Heizung Pump nozzles Lampe t moin Chauffage Pilot lamp Heater Netzschalter Interrupteur g n ral Mains switch Schalter K hlung Touche Refroidissement Key Cooling Entleerungshahn r ckseitig Robinet de vidange l arri re Drain cock rear LAUDA DR R WOBSER GMBH A CO KG Postfach 1251 D 6970 Lauda K6nigshofen Tel 093 43 503 0 Tx 689523 Fax 09343 503222 Contents Page Brief operating instructions Table of data Basic construction Safety systems Bath liquid
3. Bath bridge Evaporator Capillary and Insulation Gummitille Doullle en caoutchouc Rubber piece O Ring Joint Torique O Ring Entleerungshahn kompl Robinet de vidange compl Drain cock compl Drehknopf Bouton rotatif Rotary knob Dichtung Joint Gasket ab Serie amp partir de n de s rie as from serial number D 50 03 89 E EZD EZD EZD EZD EZD EWD US UO ETP HOF HIB UH HI DIS HI HX EST EST EM EKZ EKN SSES EIT EZV UU UU HGW HG8 HGW EMK EMK EZG EZG HGW HGB EMK HDQ uu EDT EDO UD EZD EDF 046 048 047 051 050 042 026 040 02 005 012 089 012 003 O14 102 056 032 039 009 009 200 194 008 201 229 199 230 005 068 Die 051 043 133 154 132 050 041 005 009 13 152 042 041 042 007 018 070 ap 048 pare parts RMS 20 RMS 25 H Ersatzteile Pi ces d tach es S DS RMS 6 RMS 6 30 29 27 36 15 37 Ersatzteile Pi ces d tach es Spare parts RMS 6 RMS 6 DS RMS 20 RMS 25 03 89 Ersatzteile Pi ces d tach es Spare parts RMS 6 RMS 6 DS RMS 20 RMS 25 Bestelinummer N de reference Reference number Own Dw EE Ww MA ET D OU amp F ON rs CH 17 18 20 21 22 25 24 25 26 27 28 29 30 H 32 33 34 35 36 ER 38 39 40 4l 42 43 Drehknopf Bouton rotatif Rotary knob Zeiger Aiguille Pointer Kappe Calotte Cap
4. LED Anzeige Circuit imprim Indication LED Printed circuit board LED Display Triac Triac Triac Leiterplatte Regelung Circuit imprim R gulation Printed circuit board Control Leiterplatte Netz Circuit imprim Secteur Printed circuit board Mains 220 V Z nd bertrager Transiateur d allumage Ignition transducer BV 282 1 00054 Transformator Transformateur Transformer BV 178 HO GummifuB Pied en caoutchouc Rubber butt Gitter Grille Grill Bodenwanne Fond de la cuve Bath bottom K lteaggregat Groupe frigorifique Refrigeration unit Baddeckel Couvercle de bain Bath cover Temperiereinheit kompl Innenkessel Badbriicke Verdampfer Kapillare und Isolierung Unit de thermostatisation compl Cuve interieure Pont du bain Evaporateur Capillaire et Isolation Thermostatic unit compl Inner vessel Bath bridge Evaporator Capillary and Insulation Gummit lle Douille en caoutchouc Rubber piece O Ring Joint Torique O Ring Entleerungshahn kompl Robinet de vidange compl Drain cock compl Drehknopf Bouton rotatif Rotary knob Kontrallthermometer Thermom tre de control Reference thermometer 30 100 C Dichtung Joint Gasket 3 89 E RMS 6 DS EZD 046 EZD 048 EZD 047 EZD 051 EZD 050 EWD 042 US 026 UO 064 ETP 021 HOF 012 HOF 013 HIB 012 UH 089 UD 152 HO 332 HGL 024 HQL 026 HO 333 UD 153 UD 154 HKB 318 EST 056 EST 032 EM 09 EM 092 EKZ 009 EKN 009 UL 200 UL 194 EYY 008 UL 229 UL 230 E
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6. 25 35 37 56 Indicating thermometer built in digital thermometer 0 1 C resolution absolute accuracy better than 0 3 of range Temperature probe control action Pt 500 platinum resistance thermometer PID Temperature control at 10 C C 0 01 0 02 Heating load automatic adjustment as required kw Da Cooling rating eff 20 C kw 0 2 0 23 0 25 0 C 0 14 0 15 0 2 10 C 0 08 0 10 0 16 15 C 0 05 0 06 0 13 Class to DIN 12 879 Class 1 W with R 35 and TS 35 200 Class 3 Flow rate Pressure Suction l min 8 8 5 8 8 against zero head Discharge TEEN bar 0 15 0 17 0 15 0 15 0 15 Capacity 1 4 6 14 20 19 25 Bath liquid gt to 100 C decalcified water 50 to 100 C water monoethylene glycol mixture 1 1 Dimensions Bath opening WxD mm 150x130 300x350 300x350 Depth of bath mm 160 160 200 Usable liquid depth mm 140 140 140 180 Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 Type RMS 6 RMS 6 DS RMS 20 RMS 25 Overall dimensions W x D x H mm 200x350x 350x540x 350x540x Ek 630 610 Weight kg 24 24 54 36 Power supply V Hz 220 240 V 50 Hz 230 V 60 Hz Protection Class 1 to VDE 0100 kW 1 3 1 3 123 1 4 Interference suppression according to VDE 0875 Ref No 220 240 V 50 Hz LCK III LCK 137 LCK 113 LCK 127 230V 60 Hz LCK 211 LCK 237 LCK 215 LCK 227 Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 sise Basic constru
7. and setting up The units are set up to suit the application Ensure that the ventilation openings to the refrigeration unit are not obstructed If no external circulation is required the pump connectors must be linked together with the silicone tubing supplied First the yellow cap must be re moved it is only intended to prevent the thermostat contents being pumped out unintentionally and is not suitable as a permanent closure Outflow tube always at the front return tube or suction tube at the back When connecting up an external system proceed according to Section 7 Connecting external systems For operation above 10 C use uninsulated perbunan tubing Ref No RKJ 011 for operation below 10 C the insulated silicone tubing Ref No LZS 001 is recommended When operating with photometers refractometers etc which have connectors for 4 mm int dia tubing the reducing fittings Ref No HKO 018 are screwed onto the connectors Suitable silicone tubing is Ref No RKJ 041 An adequate flow rate is required to ensure reliable ther mostating of the external apparatus Where the flow cross section is severely restricted there may be a temperature drop between bath and external system due to the low flow rate In that case the bath temperature has to be suitably increased or decreased When starting up the thermostat ensure that the liquid level does not drop too much Top up with liquid until the correct level is reached Secure the tub
8. at higher temperatures to produce rapid cooling The KLIXON cut out may switch the compressor on and off several times Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 be D G Schema K ltekreislauf Sch ma circuit de r frig ration Diagram cooling circuit Nr Teil Pi ce Part l Kompressor Compresseur Compressor 2 F llventil Vanne de remplissage Feed valve 3 K ondensator Condensateur Condenser 4 Trockner Secheur Drier 5 Kapillarrohr Tube capillaire Capillary tube 6 Verdampferschlange Evaporateur serpentins Evaporator coil 7 Fl ssigkeitsbad Thermostat Bain pour liquide du thermostat Liquid bath Thermostat Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 10 10 1 10 2 e HEEL cs Operation of the safety circuit The following three faults could oceur o The thermostat is started up without bath liquid or with the liquid level too low heater partly uncovered o The liquid level drops too much during operation especially at high temperatures The same fault may be caused by failure of the tubing and liquid being pumped out of the thermostat o Failure of the control system resulting in continuous heating The liquid eventually reaches the boiling point and evaporates If any of the above faults occur the safety circuit comes into operation A built in temperature probe measures the surface temperature of the heater and switches off the thermostat i
9. see Section 2 contains the main technical data of the thermostats If the heater overheats through loss of liquid a temperature limiter switches off heater pump electronics and refrigeration unit on all poles Warning The heater surface may reach temperatures up to 250 C especially with complete loss of liquid Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 4 4 1 4 2 4 3 SON Safety system The DIN specification 12 879 for laboratory thermostats entitled Liquid Thermostats General and Safety Requirements has been in Operation since l May 1979 This specification lays down the safety devices required and divides thermostats into different safety classes Why can it be dangerous to operate a thermostat l Thermostats are fitted with heaters which provide the necessary heating energy for the thermostatic liquid If the temperature control fails or if the liquid level is too low the heater may reach a temperature which in combination with inflammable thermostatic liquids can cause a fire in the laboratory 2 When using the thermostat with external circulation failure of the tubing can cause discharge of hot liquid and endanger persons and material The classification of thermostats depends on o whether non inflammable or inflammable thermostatic liquids are usec o whether the thermostat is operated under supervision or unsupervised The units Series RMS as described in these Opera
10. 9 Non inflammable Prolonged operation at elevated temperatures results in a decreasing propor tion of water in the mixture which gradually approaches the properties of pure glycol and thus becomes inflammable flashpoint 128 C The mixture ratio must therefore be checked from time to time i e against the original mixture or with a hydrometer Tubing continuous lengths Ref No Perbunan tubing uninsulated RKJ O11 J mm int dia Application range 0 100 C For water and water glycol mixtures silicone tubing uninsulated RKJ O16 8 mm int dia Application range 30 120 C For water and water glycol mixtures silicone tubing insulated LZS 00l 8 mm int dia With foam rubber insulation External dia approx 30 mm Use as for uninsulated silicone tubing Silicone tubing uninsulated RKJ 04 4 mm int dia Use as for silicone tubing 8 mm int dia Pump reducing fitting for tubing 4 mm int dia HKO 018 Secure tubing with clips to prevent it slipping off Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 6 6 l 6 2 7 ee Unpacking assembly and setting up The units are packed carefully to prevent transport damace If however the unit should arrive damaged the carrier or the railway authorities have to be be informed so that it can be inspected Standard accessories 1 m Silicone tubing insulated 8 mm int dia l Bath cover RMS 6 only Operating Instructions Assembly
11. IZ 005 EIT 068 EZG 009 HGW 131 HGB 152 EMK 042 HDQ 041 UU 042 EDT 007 EDO 018 UD o70 EZD oo ET 932 EDF 048 0S d atuas wod Alqied e qe u01J23UU03 SULEY An392335S JUaWaUIueig gn y suez y AQOL YST epal BuLL007 u31tug quaWaSSIPLOdjay Anazdnusaquy E Dun tun 43 Leys YITLMS SULEN Leiau36 Ana1dn1121ut 13 LE4ISZ N auausnfpe 1utodiae aubisuo gt d ap anayea ei ap abeysnCy WYO T Bun asuLazuam LOS Jossauduo dnassaiduo Aossaudwoy ue4 An238 L1JU2A 4078 La Jojou dung adwod ap a1n3304 40 OuUadwng s o G2 SWY OZ SWY 9 SW ZH 09 0G A Otz 022 IX TA s Ts Ty EN ah LN weuBeip 31n2419 SUOLX9UUOD ap eway2s Ge vanv1 Buttoog due JUaWaSSLPLOAJay adue7 Bun om aduwe Z H suley dwe An9993S adueq Z39N odueq LH JLA P Burqueys abesseuap ap J11150dS1 Bunzy21adongnequy 4 UOXLLY d 1no3n2 eau ai lngu21ns op U011237044 zynyossbunzzLysaqg TL 4 43729 abeyyney MA T Bunztay 13 aqoud aunjesaduay a4nje1adu3 ap apuos 00S Id 4A3 unjanqeuadus Ig UOLPEILPUT GF7 FLNIALI paquiag G37 a6eystysy awiaduL yinour9 bi IN 6 zuy q71 a33e d4azLaq p Y kd e ub DEE SE H i At _l Lg CH N N M DN Ht 78UEZ UN 8 3Hqw9 JSSQM H g bul3e3H uot3e21pur g11 o6eyineu 11 abeyrrisy Bunziay abLazuy q37 TA V Saunyesaduiay paxl4 YOVEms SaX1 Saunjesadway An3 dn44aquI uaunzesaduiazysajy 4 JLEYIS
12. and replaced with fresh liquid If the unit should become defective it is recommended that the thermostat unit is removed and re turned to the works Pull out the mains plug and remove the cover If you should have any questions concerning technical problems the order of spare parts or the order of additional service material please add type designation and serial number We shall always be happy to deal with queries suggestions and complaints LAUDA DR R WOBSER GMBH amp CO KG Postbox 1251 6970 Lauda K6nigshofen West Germany Phone 09343 503 0 Telex 689 523 lauwo d Fax 09343 503 222 Compact Low temperature Thermostats Series RM Accessories for Compact Low temperature Thermostats Type Ref No Reference thermometers 0 70 C graduation 0 5 C ET 030 0 100 C graduation 0 5 C ET 031 30 100 C graduation 0 5 C er 032 Reference thermometer case HKF 036 Stainless steel racks for RM 20 for test tubes centrifuge tubes etc Bath RM 20 up to 4 racks RD 13 for 56 tubes 10 13 dia 80 mm immersion UG 066 RD 18 1 for 33 tubes 14 18 dia 80 mm immersion UG 067 RD 18 2 for 33 tubes 14 18 dia 110 mm immersion UG 068 RD 30 for 14 tubes 24 30 dia 110 mm immersion UG 069 Stainless steel racks for RM 25 for test tubes centrifuge tubes etc Bath RM 25 up to 4 racks RE 13 same as RD 13 UG 070 RE 18 1 same as RD 18 1 UG O71 RE 18 2 same as RD 18 2 UG 072 RE 30 same as RD 30 UG 073 Bath cover flat
13. ction These operating instructions apply to 4 Compact Low temperature thermo stats of different construction Series RMS Compact Low temperature thermostat RMS 6 Compact bath circulation thermostat with large bath opening for thermoste ting inside the bath Compact Low temperature thermostat RMS 6 DS Compact bath circulation thermostat with a combined pressure suction pump for thermostating open and closed external systems Compact Low temperature thermostat RMS 20 Bath circulation thermostats with large bath opening for thermostating of large items or a large number of items inside the bath Compact Low temperature thermostat RMS 25 Bath circulation thermostat with large bath opening and a bath depth of 200 mm RMS 20 160 mm The common feature of all four models is the thermostat unit RMS con taining the electronics as well as the circulation pump tocether with the appropriate cooling systems Within the range where heat has to be removed from the bath the temperature control operates by running the refrigeration unit continuously while the heater maintains the bath temperature at the required setting through controlled heating pulses using a solid state propor tional PID controller with a packet switching triac relay Built in digital thermometer with 0 1 C resolution and digital temperature setting using 10 turn potentiometer and numerical indication Adjustable range and 4 fixed temperature settings The Data table
14. e that the level inside the thermostat does not drop too much when the external system is being filled with the bath liquid The digital thermometer shows the actual bath temperature To set the temperature press the button this changes the digital dis play from bath temperature to setpoint Now select the desired temperature by turning the knob wc For this operation the selector switch has to be set on When operating with a fixed temperature 25 35 37 or 56 C set the selector switch to this value If necessary adjust with a small screwdriver When the bath liquid has reached the set temperature the yellow pilot lamp heating begins to flash After the temperature has settled down the digital thermometer indicates the selected bath temperature Safety The thermostat is a Class 1 W unit It must only be operated with non inflammable liquids see also Section 5 Important note Parts of the bath cover may heat up to 60 C or more at higher operating temperatures The outflow and return tubes of the pump reach the bath temperature Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 D Das 2 Table of Data These thermostats meet the requirements of DIN 12 879 Type RMS 6 RMS 6 DS RMS 20 RMS 25 Temperature range PE 15 100 Temperature setting digital using 10 turn potentiometer and numerical indication resolution of indication 0 1 C potentiometer approx 0 03 C Fixed temperatures C
15. f a certain limiting temperature is ex ceeded According to DIN 12 879 this type of protection is called over tem perature protection Since the heater surface can reach very high tempera tures up to 250 C especially when the thermostat runs completely dry only water or weter glycol mixture may be used in the thermostat otherwise it is impossible to prevent a fire under all circumstances despite the use of a safety system Operation of the safety circuit switches off the thermostat on all poles heater pump electronics and refrigeration unit the reset button Release jumps out approx 3 mm Additionally the release of the safety circuit can be recognized when the LED Display is out of action while the unit is switched on green lamp lightened The thermostat can only be restarted after o the temperature probe on the heater has cooled down to below 60 C o the fault has been corrected liquid level too low faulty control circuit burst tubing o the reset button has been pushed in press hard This ensures that the thermostat cannot start up again automatically for example through a reduction in the temperature which could suggest that the fault has been rectified Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 en Ss ll Maintenance LAUDA thermostats are designed for continuous operation They require no regular maintenance Contaminated bath liquid should be drained out through the drain cock
16. hermostat with protection to Class 3 DIN 12 879 Accessories required immersion probe TS 35 200 and special holder Immersion probe TS 35 200 US O0l4 Fixing bow for TS 35 200 UD 049 Ersatzteile Pi ces d tach es Spare parts RMS 6 RMS 6 DS RMS 20 RMS 25 Bestellnummer N de reference Reference number an ow FE WN res N N ee mou mm re rn vi D D D IN vn E va NN ER 23 24 25 26 27 28 29 20 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 Drehknopf Bouton rotatif Rotary knob Zeiger Aiguille Pointer Kappe Calotte Cap Kappe Calotte Cover Drehknopf Bouton rotatif Rotary knob Potentlometer Potentiom tre Potentiometer 1 kOhm Temperaturbegrenzer Limiteur de temp rature Temperature limiter Druck und Ricklaufstrutzen Tubulures de refoulement et de retour Outflow Return tubes Temperstur F hler Pt 100 Sonde de temp rature Pt 100 Temperature probe Pt 100 Perbunanschlauch Tuyau Perbunan Perbunan tubing Klemme Pince Clamp Heizk rper Corps de chauffe Heater 220 240 V 50 60 Hz Feder Ressort Spring Splint Goupille Splint pin Spange Agrafe Clip R hrpropeller H lice Stirrer Schalter Interrupteur Switch Netzschalter Interrupteur secteur Malns switch Motor Moteur Motor 220 240 V Zugentlastung Protection pour c3ble Cable tension relief Netzkabel mit Schukostecker C ble secteur avec fiche contact de protection Mains cable with earthed plug Leiterplatte A D Wand
17. ing with clips to prevent it slipping off Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 8 8 1 8 2 8 5 SE The units RMS 6 DS are fitted with a combined pressure suction pump The powerful circulating pump permits the thermostating of closed external systems at higher pump rates and in particular the thermostating of open external systems There are two possibilities for maintaining a constant level when connecting open systems The suction pipe in the external bath has to be fastened in such a way that its end is positioned at the required liquid level When reducing the pump capacity of the pressure stage by using a pipe clamp at the connection pressure nozzle external bath the flow rate of the pressure stage will drop slightly below the flow rate of the suction stage That can be noticed when the suction pipe sucks in air A better and more professional solution is the application of a LAUDA Level Controller LPZ 901 which provides level control with float screw nozzle for external bath and possiblility for manual ventilation Note When thermostat and external bath are not set up at the same level the connecting pipes must be ventilated in order to prevent the bath to overflow when the pump is switched off Starting up Before starting up allow the unit to stand for at least half an hour in its normal operating position so that any oil which may have run out of the compressor curing transpor
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19. ler Circuit imprim A D Convertisseur Printed circuit board A D Converter Leiterplatte LED Anzeige Circuit imprim Indication LED Printed circuit board LED Display Triac Triac Triac Leiterplatte Regelung Circuit Imprim R gulation Printed circuit board Control Leiterplatte Netz Circuit imprim Secteur Printed circuit board Mains 220 V Z nd bertrager Translateur d allumage Ignition transducer BV 282 1 00054 Transformator Transformateur Transformer BV 178 HO 1 Blindt lle Douille d obturation Rubber piece Temperlereinheit kompi Innenkessel Badbriicke Verdampfer Kapillare und Isolierung Unit de thermostatisation compl Cuve interleure Pont du bain Evaporateur Capillaire et Isolation Thermostatic unit compl inner vessel Bath bridge Evaporator Capillary and Insulation RM 25 RM 20 Gitter Grille Grill Bodenwanne Fond de la cuve Bath bottom Gitter Grille Grill Kalteaggregat Groupe friorifique Refrigeration unit RM 25 RM 20 Gummifu8 Pled en caoutchouc Rubber butt GummifuB Pled en caoutchouc Rubber butt Gitter Grille Grill Bodenwanne Fond de la cuve Bath bottom Kalteaggregat Groupe frigorifique Refrigeration unit Baddeckel Couvercle de bain Bath cover Temperiereinheit kompl Innenkessel Badbr cke Verdampfer Kapillare und Isolierung Unit de thermostatisation compl Cuve interieure Pont du bain Evaporateur Capillaire et Isolation Thermostatic unit compl Inner vessel
20. rculation the ventilation openings must not be obstruc ted The cooling circuit is shown schematically on page 10 At temperatures below 30 C the refrigeration unit runs continuously to re move a certain amount of heat from the bath while the heater operates against this with an output which is automatically adjusted by the control system The compressor runs virtually noiselessly and vibration free It is charged with a special oil and requires no maintenance The refrigerant used is Freon 12 R 12 Maintenance The refrigeration unit operates to a large extent without maintenance If the unit operates under dusty conditions we recommend that the refrigerator condenser is cleaned every 4 to 6 months This is done best with com pressed air or nitrogen which is blown into the ventilation openings for a few minutes If necessary unscrew the ventilation grill Overloading the refrigeration unit The driving motor of the compressor is protected against overload by a double action bimetal switch KLIXON The overload switch responds both to the capsule temperature and to the current taken by the compressor motor With insufficient ventilation the housing temperature rises and with it the condensation pressure Both effects lead to overload on the driving motor and cause the thermostat to be switched off The unit switches on again automatically as soon as the compressor housing has cooled down The refrigeration unit can of course also be used
21. s and tubing Unpacking assembly and setting up Connecting external systems Starting up Cooling circuit construction and maintenance Operation of the safety circuit Maintenance Enclosures Accessories Spares Circuit diagram Summary of LAUDA Heating Thermostats and LAUDA Low temperature thermostats l 2 Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 l 8 Brief operating instructions Check thermostat and accessories during unpacking for possible transport damage and if necessary notify carrier or post office Assemble unit according to Section 6 and add items as appropriate Connect the tubing at the pump connectors Without external circulation Link together the pump connectors with the insulated silicone tubing supplied With external circulation Connect tubing to the external system Secure tu bing with clips to prevent it slipping off Use decalcified water only above 5 C or water glycol mixture below 5 C See section 5 Fill the unit up to approx 2 cm below the top plate Check the supply voltage against the data on the rating label Connect the cable to the supply Operation without refrigeration unit temperature above 30 C mains switch green I ON green lamp lights up switch cooling H 0 OFF Operation with refrigeration unit temperature below 30 C mains switch green I ON switch cooling I ON When operating with an external system ensur
22. stainless steel for Types RM 20 and RM 25 2 parts LCZ 009 Rising platform to be mounted subsequently LCZ 01 on RM 20 and RM 25 Bench area 250 x 160 mm height continuously adjustable RM 20 max 2 platforms Gable cover stainless steel for Types RM 20 and RM 25 LCZ O11 Stainless steel racks for RM 6 RF 18 1 for 20 tubes 14 18 dia 80 mm immersion UG 074 RF 18 2 for 20 tubes 14 18 dia 100 mm immersion g UG 075 Level controller RMS 6 DS only LPZ 901 for the thermostating of open external systems Tubing continuous lengths Silicone tubing 8 mm int dia RKJ 016 Silicone tubing 4 mm int dia RKJ 041 Silicone tubing insulated 8 mm int dia LZS 00 Perbunan tubing 9 mm int dia RKJ 011 Reducing fitting for pump for tubing 4 mm int dia HKO 018 Compact Low temperature Thermostats Series RM Special racks for Type RM 6 Makrolon Type Description Ref No Boehringer 8 Monotest Mannheim 2 Monotest 10 UE 001 Monotest 6 square cells Geigy 8 Centrifuge or conical tubes 100 x 16 17 mm UE 02 16 Uhlenhut tubes 100 x 9 x 10 mm Test tubes 20 test tubes UE 020 160 mm 160 x 16 17 mm Test tubes 20 test tubes or centrifuge tubes UE 022 100 mm 100 x 16 17 mm Haemolysis tubes 13 int dia 30 tubes UE 023 Eppendorf tubes 74 tubes UG 085 up to 1 EE Cuvette test Dr B Lange UE 005 UNIPROTECT R 35 LRS 002 Universal over temperature and low level protection Retrofitting with R 35 provides every t
23. t can flow back Filling Fill the unit with decalcified water or water glycol mixture according to Section 5 The capacity is indicated in Section 2 Table of Data Generally the thermostats should never be filled higher than 2 cm below the cover While the thermostat is in use the heater and the evaporator coil of the refrigerator must always be covered with liquid When it is connected up to an external system check during starting up that the liquid level in the thermostat does not drop too low due to filling up the external system If necessary top up with liquid until the correct level is reached The Low temperature thermostats RMS 20 and RMS 25 can be covered with a flat bath cover see Accessories or with a gable cover even when there is glassware or other items in the bath This is advisable especially at higher temperatures Connect the unit only to a grounded socket Check the details on the rating label against the supply voltace Ensure that the pump connectors are linked together when there is no ex ternal system Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 8 4 8 5 Operation without refrigeration unit temperatures above 30 C mains switch green I ON green lamp lights up switch cooling 0 OFF The digital display indicates the actual bath temperature Set selector switch to and fixed temperatures 24 35 37 and 56 C to Press key the setpoint now appears on
24. the digital display Select the desired temperature by turning the knob sx 10 turn potentiometer Then release the key and the display shows the actual bath temperature again The fixed temperatures can be selected directly irrespective of the setting of rotary knob The fixed temperatures can be readjusted by inserting a small screwdriver into the opening above the selector switch Pressing the key also displays the fixed temperatures When the set temperature has been reached the yellow pilot lamp heating begins to flash After the unit has settled down the digital thermo meter indicates the selected temperature When changing rapidly from a high to a low temperature the refrigeration unit can also be switched on in the heating range Operation with refrigeration unit temperature below 30 C mains switch green I ON green lamp lights up switch cooling I ON yellow lamp lights up The thermostat is switched off with the mains switch The switch cooling can remain on Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 and RMS 25 J dal OZ 9 3 J0 Cooling circuit Construction The refrigeration unit consists essentially of a hermetically sealed com pressor Heat of condensation and motor heat are dissipated through a finned condenser with fan cooling The fresh air is drawn in at the front of the unit heated and discharged to the back and to the side In order to en sure effective air ci
25. ting Instructions are to Class 1 W They are only suitable for o non inflammable bath liquids Le preferably water and the non in flammable water monoethylene glycol mixture see Section 5 Important note Even with Class 1 W the user is only protected against hazards resulting from excess temperature and low level Other hazards may arise from the type of products being thermostated e g a shift ebove or below certain temperature levels or breaking of the con tainer followed by reaction with the thermostatic liquid etc It is impossible to provide protection against all possible cases and they remain largely within the decision and responsibility of the user Compact Low temperature Thermostats RMS 6 RMS 6 DS RMS 20 end RMS 25 Gi 2 1 2 2 Bath liquids and tubing According to Section 4 only non inflammable liquids may be used The operating ranges of the bath liquids and tubing represent general data which may be limited by the operating temperature range of the unit Bath liquids Operating range 5 100 C Use decalcified water only Remember to make up losses through evapora tion at elevated temperatures Losses can be reduced by using suitable bath covers see Accessories Operating range 30 100 C Use water monoethylene glycol mixture preferably Glycoshell P 300 in the ratio I 1 Operating range 30 100 C Ultra Therm G 100 Boiling point 110 C_ Viscosity at 20 C 4 mm2 sec Ref No LZB 00
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