How to Set Up a Reaction with J
Contents
1. J KEM Scientific Inc KEM Scientific Inc 6970 Olive Blvd o Instruments for Science from Scientists St Louis MO 63130 314 863 5536 Fax 314 863 6070 E Mail jkem911 jkem com How to Set Up a Reaction with J KEM Scientific s Digital Temperature Controller This application note shows how to set up a typical heated reaction using J KEM Scientific s digital temperature controller For this example the Model Gemini controller is used but the application note applies equally well to all J KEM temperature controller models If you have questions about specific models of temperature controllers or any safety related question please feel free to contact J KEM Scientific This application note does not supercede any information in the Controllers actual User manual The User manual for each model is always the reference for that model The Model Gemini is a dual channel controller that allows two independent reactions to be run on the same controller one reaction on Channel 1 and the second on Channel 2 In this example we will only use channel 1 Gemini Dual Channel Temperature Controller Thermocouple receptacle Channel 1 has a 100 hour to turn heating On Off at a user set time Channel 2 does not have a timer Thermocouple Thermocouple extension cord Thermocouples Thermocouples are color coded When the plastic connector on the end of the thermocouple is blue it is a type T thermocouple when it2. Apollo and Gemini controllers are compatible with any size heating mantle from 5 ml to 50 liter and any 120 Vac oil bath do not use with oil baths rated less than 120 Vac J KEM s 150 Series economy controllers are compatible with 500 ml heating mantles and larger and 120 Vac oil baths do not use with oil baths rated less than 120 Vac J KEM s 230 Vac controllers are compatible with any 230 Vac heating mantle 100ml and larger They are not compatible with any size oil bath Shown is a typical set up for a solution phase reaction 1 Place the reaction flask in the appropriate size heating mantle then plug the power cord from the mantle directly into the power outlet of the temperature controller 2 Place a stirring bar inside of the flask in the solution Place the flask on a magnetic stirrer and stir the reaction for good heat transfer 3 Place a thermocouple in solution and make sure that at least the first 4 1 2 is better is covered by the fluid in the reaction flask Heater power cord 4 Enter the temperature that you want to heat the reaction to 1 e the Setpoint into the digital meter To enter the setpoint temperature i e the temperature to heat to into the controller 1 Hold in the Star button on the face of the digital meter 2 While holding in the Star button press the Up arrow to increase and the Down arrow to decrease Star button the setpoint temperature When the desired setpoint
3. temperature is showing in the display release the star button to load the setpoint When no buttons are pressed on the controller the controller shows the temperature sensed by the thermocouple When the Star button is pressed the setpoint appears as a blinking number Up to increase and Down to decrease arrows 5 Set the correct Power Control Level Your J KEM controller has a built in Power Control Computer PCC that precisely regulates power to the heater For the computer to work correctly it must know the volume of solution that is being heated It s important to understand that the PCC is set to the Volume of solution being heated not the size of the heater or the size of the flask 10 100 mi 50 500 mi 110ml Lf 300 ml 2 L Heat _ J Power Level 15 ml of solution in a 100 ml flask 75 ml of solution in a 100 ml flask If the flask above is placed ina_ The power control computer is If the flask above is placed in a 100 ml heating mantle the always set to the Volume of 100 ml heating mantle the power control input should be solution being heated not the power control input should be set to the 10 100 ml setting size of the flask or heater set to the 50 500 ml setting When the power control computer is set Test System Set Point 115 C l to the correct power level your 2 Lof N N dimethylformamide 3 L Round Bottomed Flask controller can regulate virtually any 3 L Heating Marit l k ai heate
4. is yellow it is a type K and when it is black it is atype J The color of the thermocouple the thermocouple extension cord and the thermocouple receptacle on the face of the controller must all be the same color 1 e thermocouple type or the controller will not read the correct temperature Thermocouples are available in many different styles As long as the thermocouple has the same color connector as the connector on the controller they are 100 compatible Stainless steel no Teflon coating 12 inch length Teflon coated 6 inch length Teflon coated Teflon coated hypodermic needle When a thermocouple is placed in solution often it is desirable to bend the thermocouple slightly so that more of the tip extends into the solution It does not hurt a thermocouple to be bent slightly Bend Temperature sensitive end of the thermocouple The temperature sensitive portion of a thermocouple is the first 4 of the tip It s good for the first 42 to be is solution but the first 14 must be in solution to read the temperature correctly Heaters Your J KEM controller works with virtually any 120 volt or 230 volt heaters outside of the USA heater including any size heating mantle 120 vac oil baths hot plates ovens and many other style heaters If you have questions about the compatibility of specific heaters please contact j KEM 1 liter heating mantle Oil bath 10 ml heating mantle J KEM s 200 Series
5. r to 0 1 C with less than 1 C ee Sa Paet overshoot on initial warming Standard Lab Oven Temperature C Test System Set Point 55 C 12 mL of THF 25 mL Round Bottomed Flask 25 mL Heating Mantle Time min 30 For a detailed explanation of the Power Control Computer see Section Two in the controller s User manual Other Features of Your J KEM Controller Serial Communications J KEM s Research Grade controllers have USB communications as a standard features KEM Net control and data logging software is available at no charge on J KEM s web site 100 Hour Timers Some models of controllers have built in 100 hour times that turn heating On or Off at a user set time See the user manual for instructions on how to set the timer functions Custom Features J KEM welcomes inquires about temperature control applications requiring custom hardware or software
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