Parr Instrument 4848B - Manual (Page 15)

4848B Reactor Controller
w w w . p a r r i n s t . c o m 13
A sample program to heat to 200 °C as fast a pos-
sible, hold for 2-hrs, and come back down as quickly
as possible:
Variable Value Meaning
ptrn 00 Pattern 0
SP00 200 Setpoint of 200 °C (first step is
a soak by default)
tI00 00:00 Move setpoint to 200 °C im-
mediately
SP01 200 Setpoint of 200 °C
tI01 01:00 Ramp from 200°C to 200 °C
over 1-hrs *
SP02 200 Setpoint of 200 °C
tI02 02:00 Ramp from 200C to 200 °C over
2-hrs **
SP03 25 Setpoint of 25 °C
tI03 00:00 Ramp to setpoint immediate-
ly***
SP04 25 Setpoint of 25 °C
tI04 00:00
SP05 25 Setpoint of 25 °C
tI05 00:00
SP06 25 Setpoint of 25 °C
tI06 00:00
SP07 25 Setpoint of 25 °C
tI07 00:00
PSy0 3 Execute steps 0-3 only****
CyC0 0 Do not re-cycle program
Lin0 off Do not execute another pro-
gram upon completion of this
program
* The physical system will take some time to go from
room temp to 200 °C. Step 01 is presented as a “heat
up” step. The time value in this step should be ad-
justed after the fi rst run is complete and the operator
knows the expected heat up time.
** It is useful to keep this step 02 separate from step
01 so you can adjust step 01 to match the heat up
time.
*** The time is zero, making this a step function in-
stead of a ramp.
**** Steps 4-7 are not executed here.
Appendix: sample programs
A sample program to ramp from 25 °C to 250 °C in
2-hrs:
Variable Value Meaning
ptrn 00 Pattern 0
SP00 25 Setpoint of 25 ºC (first step is a
soak by default)
tI00 00:01 Hold for 1-min
SP01 250 Setpoint of 250 °C
tI01 02:00 Ramp to setpoint in 2 hrs
SP02 250 Setpoint of 250 °C
tI02 00:40 Ramp to setpoint in 40-min*
SP03 25 Setpoint of 250 °C
tI03 00:00 Ramp to setpoint immediately**
SP04 25 Setpoint of 25 °C
tI04 00:00
SP05 25 Setpoint of 25 °C
tI05 00:00
SP06 25 Setpoint of 25 °C
tI06 00:00
SP07 25 Setpoint of 25 °C
tI07 00:00
PSy0 3 Execute steps 0-3 only***
CyC0 0 Do not re-cycle program
Lin0 off Do not execute another program
upon completion
* The beginning and fi nal setpoint are equal, making
this a soak step.
** The time is zero, making this a step function in-
stead of a ramp.
*** Steps 4-7 are not executed here.
**** The SP_0 vaue must be higher than the initial
temperature (PV) of the reactor or the program will
not initiate correctly.