Related Manuals for J-KEM Scientific 250
Summary of Contents for J-KEM Scientific 250
- Page 1 Temperature Control for Research and Industry Model 250 Temperature Controller User Manual...
- Page 3 Warranty J-KEM Scientific, Inc. warrants this unit to be free of defects in materials and workmanship and to give satisfactory service for a period of 12 months from date of purchase. If the unit should malfunction, it must be returned to the factory for evaluation. If the unit is found to be defective upon examination by J-KEM, it will be repaired or replaced at no charge.
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Page 4: Table Of Contents
INDEX SECTION PAGE 1. QUICK OPERATING INSTRUCTIONS ......4 KEM-NET DATA LOGGING AND CONTROL SOFTWARE ..5 2. -
Page 5: Quick Operating Instructions
Section 1: Quick Operating Instructions The three steps below are the basics of using your temperature controller. The User’s Manual is a reference that explains the controller more fully as well as some of its more sophisticated features. It’s recommended that new users unfamiliar with process controllers read the entire manual carefully. -
Page 6: Kem-Net Data Logging And Control Software
KEM-Net Data Logging and Control Software At the beginning of 2008, J-KEM implemented a redesign of it’s research grade temperature and vacuum controllers. The redesign involved both the hardware running your controller and software for remote control and data logging. Hardware –... -
Page 7: Adjusting The Controller For Stable Control With Various Heaters
Temp. drying oven Temp. Conditions: 100 ml Toluene Curve 1: Controller loaded with 250 ml Round bottomed flask tuning parameters for 250 ml Heating mantle heating mantles Power Setting = 50 - 500 ml Time (min) Time (min) -
Page 8: Autotuning Procedure
It’s important to understand that this controller isn’t a simple ON/OFF type controller (i.e. ON when below the set point, OFF when above [though it can be made to work this way, see Section 3.11]). Rather it’s a predictive controller. Based on the shape (slope) of the heating curve, the controller predicts (calculates) the percent of power to apply to the heater now to control the shape of the heating curve minutes in advance. - Page 9 New tuning Temp values loaded into memory Point Heat to set point The autotune sequence. after entering new parameters During autotune the controller heats to 75% of the set point temperature 75% of where it oscillates for several cycles set point before loading the new tuning parameters.
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Page 10: Tuning For Heating Mantles: A Special Case
Autotune Errors. The autotune routine can fail for several reasons. If it fails, the controller displays the error message “tunE” “FAiL”. To remove this message turn the controller off for 10 seconds. Try the procedure titled “Autotuning the Controller for Very Fine Control” above. If autotune fails again, call and discuss your application with one of our engineers. -
Page 11: Operations Guide
Section 3: Operations Guide Front Panel Description. 11 - Serial Communications (on back) Figure 1 Temperature Display. Shows temperature of the process as the default display. Shows set point temperature (i.e. desired temperature) when ‘ * ’ button is pressed. Control Key. -
Page 12: Heater Restrictions
Heater Restrictions. The heating outlets (10) deliver 15 amps of current at 120 VAC into resistive loads (heating mantles, hot plates, ovens, etc.). Use only resistive loads that are safely operated at 120 VAC and require less than 15 amps or damage to the controller and a safety hazard may result. •... - Page 13 SPrn SetPoint Ramp Run. Allowable Values: ON, OFF, Hold This parameter turns the Ramp-to-Setpoint feature ON or OFF. During an active run, if this parameter is set to ‘Hold’, the setpoint ramp stops and holds at its’ current value. This continues until the parameter is set to ON or OFF.
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Page 14: Cooling Outlet
50 - 500 mL switch is set to the volume of solution, not the size of the 300 ml - 2 L flask]. For example to heat 250 ml of toluene to 80 C in a 1 ≥ L round bottomed flask choose the third power setting (50 - 500 ml) since the solution volume falls within this range. - Page 15 Even though the solvent volume isn’t included in this power 250 ml flask 10 - 100 ml setting, it should be used because low temperatures are better 250 ml heating mantle (10% power) regulated with less power. SP = 35 Avoid switching between power levels while the controller is heating.
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Page 16: Affect Of Power Setting On Heating Profile
Affect of Power Setting on Heating Profile. The following graphs show the effect of selected power levels on heating performance in a variety of situations. Each example contains 1 optimal and 1 or 2 less optimal settings demonstrating use of the power reduction circuit. Graph 1 This graph shows typical heating profiles for a laboratory... -
Page 17: Do's And Don'ts When Using Your Controller
Set point = 155 C Graph 3 Power = > 2 L (100% power) Another factor affecting the choice of power setting is the set point temperature. For set points near room temperature a low Set point = 100 C power level is adequate. -
Page 18: Resetting The Controller For Use With Heating Mantles
Resetting the Controller for Use With Heating Mantles. If you want to use your controller with heating mantles after it’s been tuned for a different style heater, rather than autotuning the controller with the heating mantle, J-KEM recommends that the controller be manually tuned by following the procedure below. -
Page 19: Changing Between Pid And On/Off Operating Modes
3.11 Changing Between PID and ON/OFF Operating Modes. The controller can heat in either of 2 operating modes, PID (Proportional, Integral, Derivative) or ON/OFF mode. The difference between them is the way they supply power to the heater. In ON/OFF mode (the simplest heating mode), the controller is ON when it’s below the set point and OFF when above. -
Page 20: Troubleshooting
3.13 Troubleshooting. Problem Cause Corrective Action Large over shoot of the set Output power level is set too high. Set the output power level to a lower setting (see Section 3.6). point (> 3 o ) during initial warm-up or unstable temperature control. -
Page 21: Application Notes
Section 4: Application Notes Supplemental application notes on the following topics are available by contacting J-KEM. Application Note Subject How to heat oil baths with your controller. (Included in Appendix) Changing the controller’s thermocouple type. Changing the heating outlet into a cooling outlet. Using the controller for unattended fractional distillations. -
Page 22: Controlling The Heating Mantle Temperature Directly
would continue to rise – even though all power had been disconnected – until the range coil cooled down. This problem of overshooting the set point during initial warm-up is the major difficulty with process controllers. Overshooting the set point is minimized in two ways by your J-KEM controller – but first let's finish the range analogy. -
Page 23: Automatic Storage Of Min/Max Temperatures
Heating Power After the controller is reprogrammed, place a fine gage wire thermocouple Mantle Size Level ≈ ( 1/3 the size of kite string; available from J-KEM) in the bottom third of 5 & 10 ml 1-10 ml 25 ml 10-100 ml the heating mantle and fit the flask snugly on top so that the thermocouple 50 ml - 22 L... -
Page 24: Appendix
Appendix Using the Controller With an Oil Bath Application Note #1 Using your 200-Series controller with an oil bath is usually not recommended. J-KEM manufactures a 400-Series controller designed for use with oil bath and is recommended for this application. The 200-Series controller can be used safely with oil baths if the instructions in this application note are followed. -
Page 25: Safety Considerations And Accurate Temperature Control
Safety Considerations and Accurate Temperature Control For safety critical and non-typical organic reactions (especially polymeric reactions) or for use with heaters other than heating mantles the user must either 1) monitor the reaction closely to verify the tuning parameters are appropriate for the current application, or 2) autotune the controller for the application. -
Page 26: Resetting The Controller To Original Factory Settings
III. Resetting the Controller to Original Factory Settings J-KEM manufactures the most technically advanced temperature controller available and should give you consistently flawless control. If you have difficulty with your controller, a good place to start to correct the problem is by loading the original factory settings. If you still have difficulty with your controller, our Engineering department will help you resolve the problem.