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MON20/20 Software for Gas Chromatographs User Manual
SEPTEMBER 2010 3-9000-745
3-7
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:
6. 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.
7. To save the changes and close the window, click OK.
3.1.6 Setting 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.
To set a heater’s PWM Output, do the following:
1. Select Heaters... from the Hardware menu. The Heaters window
displays.
PID Gain 0 - 500
PID Integral 0 - 500
PID Derivative 0 - 50000
Fixed On mode is not recommended for general GC operations. Switching a heater to
Fixed On mode removes its ability to maintain a constant temperature because the
power delivered to the heater will not fluctuate based on the temperature setpoint, but
will instead remain at the level set by the user.
CAUTION