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Note
Heaters 1 and 2 should never exceed 150 °C.
4. To exclude a heater from the Warm Start process, select its Ignore Warm Start check
box.
Note
A warm start occurs when the GC restarts after having been shut down during an auto
sequence analysis run. The GC will activate the heaters and wait until they reach their
setpoints and the temperature stabilizes; the GC will then resume the auto sequence run.
5. The appropriate rows under the PID Gain, PID Integral, and PID Derivative columns can
also be edited by double-clicking and entering a new value. The value ranges for
each column is as follows:
PID Gain 0 - 500
PID Integral 0 - 500
PID Derivative 0 - 50000
Note
You should not deviate from the default settings for these variables, which were determined
by experienced personnel.
6. Click OK to save the changes and close the window.
Note
To save the changes and leave the window open so that you can monitor the heaters’ status,
click Save. The current temperature of each heater displays in the Temperature column, and is
updated in real time.
3.1.7 Set PWM Output
Note
Pulse-Width Modulation (PWM) is a technique for providing intermediate amounts of electrical
power between fully on and fully off.
A heater needs voltage to operate. The amount of voltage that is delivered to a heater can
be controlled manually when the heater is set to Fixed On mode. Setting a heater to Fixed
On mode can be useful when troubleshooting heater issues.
Hardware
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