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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.  The controller is preprogrammed 
for use with heating mantles fitted to round bottomed flasks running “typical” organic reactions (i.e., non-
polymeric reactions in solvents such as THF, toluene, DMF, etc.). 
 If the controller is used with this type of 
reaction, the 3 steps below will help you get started.

To use heaters other than heating mantles:

See Section 2.

Do not use the controller to heat oil baths:

See Section 3.2 & Appendix I.

For instructions about the cooling outlet:

See Section 3.4.

For polymer synthesis, atypical, expensive, or safety critical reactions:

See Appendix II.

1

Place the thermocouple in the solution being heated.  Place at least the first 1/4” of the thermocouple 
directly in the solution being heated.  Thermocouples can be bent without harming them.  If you’re 
heating a corrosive liquid, use Teflon coated thermocouples.  If you are heating a sealed reaction, see 
Section 4.2.

2

Set the power level switch to the 
volume of solution being heated 

(not the size of the flask being used).  The 
power level switch can be thought of as a 
solid state variac.  Volume ranges are printed 
above this switch as a guide to select the 
correct power level since it’s easier to guess 
the volume being heated than the appropriate 
“percent power” to apply to a heater.  ‘Heat 
Off’ turns off the heater so the controller 
displays temperature only.  All new users 
should read Section 3.6.

1-10 ml

10-100 ml 50-500 ml

300 ml-2 L

> 2 L

Output

Power Level

Heat

Off

A power

is equivalent to

   

   setting of.....

 

       a variac setting of:  

 

 

1-10 ml

3%

10-100 ml

10%

50-500 ml

25%

300 ml - 2 L

50%

> 2 L

100%

TIP

: Because the power switch 

acts like a variac, if the reaction 
is heating too slowly or you need 
more power (e.g., heating to high 
temperatures), give the heater 
more power by turning the power 
level up one setting.  If the 
reaction needs less power than 
normal(e.g., heating to low 
temperatures (<60

o

 C) or the 

temperature overshoots the set 
point excessively, turn the power 
down one setting.  

DO NOT

 set 

the power switch on a setting too 
high initially to heat the reaction 
quickly and then lower it to the 
correct setting, this degrades 
heating performance.

3

Enter the setpoint

 

(i.e., the desired 

temperature).  Hold in the 

 button and 

simultaneously press the 

 key to increase or the

 

 key to decrease the setpoint.  The setpoint can

 

be seen at anytime by holding in the 

 button, the 

setpoint appears as a blinking number in the 
display.

*

8 0. 0

5

Содержание 250

Страница 1: ...Temperature Control for Research and Industry Model 250 Temperature Controller User Manual...

Страница 2: ...2...

Страница 3: ...OSE IN NO EVENT SHALL J KEM SCIENTIFIC INC BE LIABLE FOR CONSEQUENTIAL INCIDENTAL OR SPECIAL DAMAGES THE BUYER S SOLE REMEDY FOR ANY BREACH OF THIS AGREEMENT BY J KEM SCIENTIFIC INC OR ANY BREACH OF A...

Страница 4: ...ts When Using Your Controller 16 3 9 Resetting the Controller for Use With Heating Mantles 17 3 10 Changing the Temperature Display Resolution 17 3 11 Changing between PID and ON OFF Operating Modes...

Страница 5: ...e volume of solution being heated not the size of the flask being used The power level switch can be thought of as a solid state variac Volume ranges are printed above this switch as a guide to select...

Страница 6: ...ntrols and data logs up to 16 controllers simultaneously Until KEM Net is available J KEM is offering KEM Log at no charge KEM Log provides remote control and data logging for one J KEM controller KEM...

Страница 7: ...of tuning parameters For the controller to heat with stability it must have programmed with the tuning parameters for the heater currently being used Prior to shipment tuning parameters were programme...

Страница 8: ...ct on the cooling outlet 1 Set the equipment up in the exact configuration it will be used For example to tune to a vacuum oven place the thermocouple in the room temperature oven and plug the oven in...

Страница 9: ...heater has its own thermostat or power controls turn both as high as they ll go With this procedure it s not necessary for the equipment to start at room temperature This procedure can be performed at...

Страница 10: ...ning parameters have been changed or the controller has been autotuned and you want to go back to using heating mantles J KEM recommends that the tuning parameters for heating mantles be loaded manual...

Страница 11: ...e same color plug as the thermocouple input 6 on the front of the controller 7 Controller On Off switch For maximum display accuracy turn on the controller 30 minutes prior to use WARNING Due to the n...

Страница 12: ...feature of J KEM s controllers called Ramp To Setpoint allows you to enter a specific heating rate e g heat to 120o C at a rate of 5o C Hour a second feature called Soak then lets you specify how long...

Страница 13: ...he temperature meter until the word tunE appears in the display then release both keys 2 Press the key 8 times until the word SPrr appears in the display This is were you set the ramp rate in units of...

Страница 14: ...or message inPt FAiL blinks in the temperature meter display and the controller stops heating 3 6 Power Reduction Circuit This circuit 8 is the interface to J KEM s patented power control computer whi...

Страница 15: ...volume isn t included in this power setting it should be used because low temperatures are better regulated with less power Avoid switching between power levels while the controller is heating Specifi...

Страница 16: ...Conditions Set point 70o C 50 ml Toluene 100 ml Round bottomed flask Graph 1 This graph shows typical heating profiles for a laboratory oven and an HPLC column In the example of the oven the heating c...

Страница 17: ...oop should not be broken at any point Don t remove either the thermocouple or heater from the solution without setting the power level to the Heat Off With the thermocouple or heater separated from th...

Страница 18: ...ey press the or key until the value 3 0 appears in the display then let go of all the keys 6 Press the key once and the word CyC t will appear in the display First hold in the key then while holding i...

Страница 19: ...hat the controller must be properly tuned to the heater being used whereas ON OFF mode requires no tuning Since both heating modes have their advantages simplicity vs accuracy instructions to change t...

Страница 20: ...n the display tunE FAiL Autotune routine failed Turn off controller for 10 seconds See Section 2 2 Displayed temperature is incorrect Note Type J The controller has not warmed up The display temperatu...

Страница 21: ...ing a large volume is being heated the controller sets internal parameters appropriate for heating large volumes If a large rise in temperature results the controller responds by loading a set of para...

Страница 22: ...operator control and has a major impact on the amount of overshoot on initial warm up 2 Again referring to the range analogy you d obtain better control when heating small volumes if the range had mor...

Страница 23: ...y after the routine is started and cleared by turning the controller off This procedure must be started every time you want to record temperatures Procedure to Start Temperature Logging 1 Press and ho...

Страница 24: ...he controller may need to be autotuned for the oil bath see User s Manual but this is discouraged unless you ll be using the oil bath frequently 2 If the reason for using an oil bath is that a small v...

Страница 25: ...ed to water since the coefficient of heat for hexane is 0 54 calories g o C and water is0 1 0 calorie gram o C That means that 1000 watt seconds of input power will raise the temperature of 10 g of he...

Страница 26: ...ay Let go of all the keys 10 Press the key once and the word int t will appear in the display Next hold in the key then while holding in the key press the key until the value 10 appears in the display...

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